[slegarraga]

Summary

• map OpenAI-compatible streaming tool-call deltas without index to a stable synthetic index by provider id
• lets the existing pending-name buffer handle providers that stream arguments before function.name
• adds a regression test for an SGLang-style tool_calls[] stream matching Functional calling is not working from meta/llama-3.3-70b from sglang framework #5885
• adds a patch changeset for @ai-sdk/openai-compatible

Context

Fixes #5885.

This is a follow-up to the existing fixes for optional tool_calls[].index (#7240) and delayed function.name (#14760). The combined shape still failed because no-index deltas bypassed the pending-name buffer and went directly to StreamingToolCallTracker, which rejects a new tool call before function.name is available.

Verification

• pnpm --filter @ai-sdk/openai-compatible test:node -- src/chat/openai-compatible-chat-language-model.test.ts
• pnpm --filter @ai-sdk/openai-compatible test:edge -- src/chat/openai-compatible-chat-language-model.test.ts
• pnpm --filter @ai-sdk/openai-compatible type-check

[gr2m]

closed via #7240