fix(provider): generate fallback ID for tool calls missing 'id' in streaming

[ctharvey]

Problem

Providers like NVIDIA (moonshotai/kimi-k2.5) omit the id field in streaming tool_calls deltas, causing InvalidResponseDataError: Expected 'id' to be a string. crashes. This breaks any MCP tool call when using these providers.

Root Cause

In openai-compatible-chat-language-model.ts:541, the streaming path threw InvalidResponseDataError when toolCallDelta.id == null. However, the non-streaming path already uses generateId() as a fallback (lines 247, 591, 634, 668).

Fix

Replace the throw with generateId() + console.warn, consistent with the existing pattern:

// Beforeif(toolCallDelta.id==null){thrownewInvalidResponseDataError({ ... })}// Afterif(toolCallDelta.id==null){toolCallDelta.id=generateId()console.warn(`[openai-compatible] Tool call missing 'id', generated fallback: ${toolCallDelta.id}`)}

generateId was already imported from @ai-sdk/provider-utils (line 17).

Testing

• 3 new regression tests covering: single missing ID, preserved real ID, and multiple missing IDs
• All 11 existing copilot provider tests still pass

Impact

• Providers that include id — no behavior change
• Providers that omit id — tool calls now succeed instead of crashing

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[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential Duplicate Found:

• PR fix: generate fallback tool call IDs for providers missing id field #12585: "fix: generate fallback tool call IDs for providers missing id field"
  • fix: generate fallback tool call IDs for providers missing id field #12585
  • Why related: This PR appears to address the exact same issue—generating fallback IDs for tool calls when the id field is missing from providers. This is likely either a duplicate or a previous attempt at the same fix that may need to be checked for status/closure.

Related PRs (not duplicates):

• PR fix: OpenAI-compatible provider improvements (system messages, image support, stream interruption) #23501: "fix: OpenAI-compatible provider improvements (system messages, image support, stream interruption)"

  • Broader improvements to the same openai-compatible-chat-language-model component

• PR feat(processor): add plugin stream hooks for tool streaming lifecycle #25245: "feat(processor): add plugin stream hooks for tool streaming lifecycle"

  • Related to tool streaming lifecycle but different focus

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