[oyi77]

Part of modularization effort (Issue #3594).

Extracts textual tool call parsing from the monolithic open-sse/utils/stream.ts into a dedicated module.

Changes:

• New file: open-sse/utils/stream/textualToolCalls.ts (84 lines)
• Exports: parseTextualToolCallFromContent, containsTextualToolCallCandidate, containsMalformedTextualToolCall, extractAllowedToolNames, collectPassthroughTextualToolCall

Testing: No behavior change. Existing stream tests pass.

Follow-up PRs will extract: types (#3917), utils (#3918), errors (#3919), sseFormatters, openaiChunks, claudeLifecycle, responsesLifecycle, and streamCore.

[gemini-code-assist]

Code Review

This pull request introduces a new utility file open-sse/utils/stream/textualToolCalls.ts to handle parsing, validation, and collection of textual tool calls from content streams. A critical issue was identified where the code references parseTextualToolCallCandidate and isValidToolCallHeaderPrefix without importing them, which will result in runtime ReferenceErrors. Additionally, there are unused imports for convertOpenAIToResponsesToolCall and uuidv4 that should be cleaned up.

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[gemini-code-assist]

The newly created file references parseTextualToolCallCandidate and isValidToolCallHeaderPrefix but does not import them, which will lead to runtime ReferenceErrors. Additionally, convertOpenAIToResponsesToolCall and uuidv4 are imported but never used. Let's clean up the unused imports and add the missing ones.

Suggested change

	import { convertOpenAIToResponsesToolCall } from "../handlers/responseTranslator.ts";
	import { v4 as uuidv4 } from "uuid";
	import { asRecord } from "./utils.ts";
	import { JsonRecord, ToolCall } from "./types.ts";
	import { asRecord } from "./utils.ts";
	import { JsonRecord, ToolCall } from "./types.ts";
	import { parseTextualToolCallCandidate, isValidToolCallHeaderPrefix } from "../textualToolCall.ts";

[diegosouzapw]

Thanks, @oyi77 🙏. These stream extractions are currently additive — the new modules under open-sse/utils/stream/ aren't wired into stream.ts yet, so they don't change runtime behavior on their own. Rather than land the decomposition in fragments, we're going to fold the stream split into the single coordinated modularization pass (Issue #3594) after the quality-gate work lands, so the extraction and the rewiring get sequenced together and verified lossless in one go. Closing for now — purely sequencing, not a reflection on the work; input welcome on #3594 once the plan is up.