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fix: serialize non-standard FunctionResponse dicts in AnthropicLlm#4807

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giulio-leone:fix/anthropic-function-response-fallback
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fix: serialize non-standard FunctionResponse dicts in AnthropicLlm#4807
giulio-leone wants to merge 2 commits intogoogle:mainfrom
giulio-leone:fix/anthropic-function-response-fallback

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@giulio-leone
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Summary

Fixes #4779

part_to_message_block() only handled function_response dicts containing "content" or "result" keys. Any other dict structure (e.g. SkillToolset returning {"skill_name": ..., "instructions": ...}) fell through to an empty string, causing Claude to never see the tool output.

Changes

  • anthropic_llm.py: Added json.dumps() fallback after the existing "content" / "result" checks, so non-standard response dicts are serialized to JSON text instead of being silently dropped.
  • test_anthropic_llm.py: Added regression test verifying that a SkillToolset-style response dict is round-tripped correctly through part_to_message_block().

Testing

  • All 18 test_anthropic_llm.py tests pass (including the new one)
  • Full unit test suite: 4623 passed, 0 regressions

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google-cla bot commented Mar 13, 2026

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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@adk-bot adk-bot added the models [Component] Issues related to model support label Mar 13, 2026
@rohityan
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Hi @giulio-leone , Thank you for your contribution! It appears you haven't yet signed the Contributor License Agreement (CLA). Please visit https://cla.developers.google.com/ to complete the signing process. Once the CLA is signed, we'll be able to proceed with the review of your PR. Thank you!

@rohityan rohityan self-assigned this Mar 13, 2026
@rohityan rohityan added the request clarification [Status] The maintainer need clarification or more information from the author label Mar 13, 2026
@giulio-leone giulio-leone force-pushed the fix/anthropic-function-response-fallback branch from db815f8 to 936a699 Compare March 14, 2026 19:29
@giulio-leone
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Rebased onto latest main to resolve merge conflicts.

The upstream branch introduced improved json.dumps() serialization for standard result values (dict/list). I kept that improvement and preserved the fallback path for non-standard response dicts (e.g. SkillToolset returns) that was the purpose of this PR.

Both the upstream PDF document tests and this PR's non-standard response test are included.

giulio-leone and others added 2 commits March 14, 2026 21:08
…-2-preview

The gemini-embedding-2-preview model requires the Vertex AI
:embedContent endpoint instead of the legacy :predict endpoint used
by older models (text-embedding-004, text-embedding-005).

In google-genai <1.64.0, embed_content() unconditionally routed to
:predict on Vertex AI, which returns FAILED_PRECONDITION for this
model.

v1.64.0 (googleapis/python-genai@af40cc6) introduced model-aware
dispatch in embed_content(): models with "gemini" in the name are
routed to :embedContent via t_is_vertex_embed_content_model(), while
older text-embedding-* models continue to use :predict.

This version also enforces a single-content-per-call limit for the
embedContent API, which is why FilesRetrieval sets embed_batch_size=1.

Co-authored-by: Xiang (Sean) Zhou <seanzhougoogle@google.com>
PiperOrigin-RevId: 883689438
Rebased onto latest main, resolved conflicts with upstream json.dumps improvement.
Keeps both upstream's json.dumps serialization for standard results AND the
fallback path for non-standard response dicts (e.g. SkillToolset).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@giulio-leone giulio-leone force-pushed the fix/anthropic-function-response-fallback branch from 936a699 to 31301a3 Compare March 14, 2026 20:08
@giulio-leone
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@rohityan Thanks for the heads-up! I'll get the Google CLA signed. Will follow up once it's done.

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AnthropicLlm.part_to_message_block() drops non-standard FunctionResponse dicts (breaks SkillToolset with Claude)`

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