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Extract the JSON tool-call streaming emit loop into emitJSONToolCallDeltas and unit-test it against every shape that can hit the streaming worker: * the bug case — a healing-marker stub at index 0 must NOT bump lastEmittedCount, so subsequent content chunks keep flowing; * the autoparser-correctly-working case — empty jsonResults (because the C++ autoparser cleared the raw text and delivers tool calls via TokenUsage.ChatDeltas) is a no-op, leaving the deferred end-of-stream emitter to ship the autoparser's tool calls; * a single complete tool call — emit one chunk, advance to 1; * arguments arriving as a JSON-string vs as a nested object — both serialize to the wire as JSON-string arguments; * multiple parallel tool calls — one chunk each; * a real tool call followed by a partial stub — emit the real one, stop at the stub, resume on a later chunk once the stub completes. Locks down the no-regression guarantee the user asked for: this PR's fix is scoped to the pure-content fallback path; when the autoparser actually classifies tool calls (jinja-recognized chat format with tool support), the helper is a no-op and nothing changes. Assisted-by: Claude:opus-4-7 [Read] [Edit] [Bash] [Write] Signed-off-by: Ettore Di Giacinto <mudler@localai.io>