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Accept Anthropic code execution containers without skills - #10373
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tim-smart merged 4 commits intoNov 5, 2026
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The generated BetaContainer required a skills key, but the API sends the
container as { id, expires_at } and adds skills only when the request loads
skills. Every response in which Claude ran code therefore failed in
generateText with "Missing key at ["container"]["skills"]", and streamText
failed at the final message_delta.
Make skills optional in BetaContainer in the codegen.yml patch that already
does this for Container, and update Generated.ts to the generator's output
for that schema.
State only the reason the patch makes BetaContainer skills optional.
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Type
Description
When Claude runs code, the Messages API returns a top-level
containerwith onlyidandexpires_at, and addsskillsonly when the request loads skills.BetaContainerrequiresskills, so these responses fail to decode:streamTextfails the same way at the finalmessage_delta, after the text has streamed, becausedelta.containerhas the same shape.The code execution tool docs say the response "includes a top-level
containerobject with the container'sidandexpires_attimestamp", and the programmatic tool calling response example has exactly those two keys. Recorded responses agree: in vercel/ai's Anthropic fixtures,anthropic-code-execution-20250825.1.json,anthropic-code-execution-file-upload.1.json,anthropic-web-fetch-tool-20260209.1.jsonand their.chunks.txthave noskills, and only theanthropic-code-execution-20250825.pptx-skillfixtures, which load a skill, have it. Aclaude-opus-4-8cassette in 0xPlaygrounds/rig (anthropic/opus_4_8/web_search_with_dynamic_filtering_succeeds.yaml), whose request usedweb_search_20260209, carries the same container next to anencrypted_code_execution_resultblock from #10322. Passed toAnthropicClient.createMessage, it and the vercel/ai responses above fail onmainon the missingskillskey and decode with this change (the.chunks.txtrecordings throughcreateMessageStream).Through
LanguageModel,generateTextandstreamTextwithCodeExecution_20250522now return the code execution result and the container id in the finish metadata instead of failing. WithCodeExecution_20250825,LanguageModelstill rejects bash and text editor calls after decoding, at tool-parameter validation (Missing key at ["code"]instreamText); that is a separate problem with that tool's parameter schema.codegen.ymlalready makesskillsoptional for the non-betaContainer. This addsBetaContainerto the same patch. Runningeffect-ai-codegen generate --provider anthropicwith the base and the patchedcodegen.ymlgives output that differs only inBetaContainer, andGenerated.tsis updated to that output.The new
generateTexttest decodes a response whose container has noskillsand checks that the container is kept in the finish metadata. It fails onmainwith the error above.Related
Same approach as #10296 and #9975.
Closes EFF-3375