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Fix Anthropic API 400 error when tool_use blocks lack corresponding tool_result blocks Includes evidence for Anthropic API troubleshooting demand.
messages.2: `tool_use` ids were found without `tool_result` blocks immediately after Fix Anthropic Claude API content filtering policy blocking output Includes evidence for Anthropic API troubleshooting demand.
API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"Output blocked by content filtering policy"}} Fix Anthropic API prompt caching not working for prompts under 2048 tokens Includes evidence for Anthropic API troubleshooting demand.
Prompt caching for Claude Sonnet appears to start at 2048 tokens instead of documented 1024 Fix Anthropic API structured output error when using complex JSON schemas Includes evidence for Anthropic API troubleshooting demand.
compiled grammar is too large Fix Anthropic SDK computer-use feature broken after upgrading to v0.75.0 Includes evidence for Anthropic API troubleshooting demand.
Extra 'caller' Field in Request Breaks computer-use Between v0.74.1 and v0.75.0 Fix Anthropic SDK error where API returns empty text blocks that the SDK rejects Includes evidence for Anthropic API troubleshooting demand.
SDK returns empty text blocks, but does not accept them Fix 400 error when using Xiaomi MiMo Token Plan Anthropic-compatible endpoint with thinking mode and tool_use message replay Includes evidence for Anthropic API troubleshooting demand.
MiMo Token Plan Anthropic-compatible endpoint returns 400 when thinking + tool_use history is replayed Fix zodOutputFormat error when using Anthropic TypeScript SDK with zod version 3 Includes evidence for Anthropic API troubleshooting demand.
zodOutputFormat fails when project uses zod v3 Fix Anthropic API returning unexpected 400 Bad Request during tool use concurrency in Claude Code Includes evidence for Anthropic API troubleshooting demand.
API Error: 400 due to tool use concurrency issues. Run /rewind to recover the conversation. Fix Anthropic API 500 error with Claude Model None in Claude Code Includes evidence for Anthropic API troubleshooting demand.
API Error 500 — Claude Model None Fix intermittent 404 Not Found errors on Anthropic Batch API retrieve and results calls Includes evidence for Anthropic API troubleshooting demand.
NotFoundError (404) on Batch API Fix AttributeError NoneType has no attribute model during Anthropic Bedrock streaming requests Includes evidence for Anthropic Python SDK troubleshooting demand.
AttributeError: 'NoneType' object has no attribute 'model' Fix RemoteProtocolError peer closed connection during Anthropic streaming with code_execution and skills Includes evidence for Anthropic Python SDK troubleshooting demand.
httpx.RemoteProtocolError: peer closed connection without sending complete message body (incomplete chunked read) Fix 404 error when calling Anthropic count_tokens endpoint, or resolve unexpected rate limiting caused by SDK fallback behavior Includes evidence for Anthropic API troubleshooting demand.
404 Not Found — POST /v1/messages/count_tokens Fix Anthropic TypeScript SDK ignoring async apiKey function for dynamic key rotation Includes evidence for Anthropic API troubleshooting demand.
Anthropic SDK TypeScript: async apiKey function silently discarded — all requests sent without X-Api-Key header → 401 errors Fix Anthropic SDK stripping file paths during multipart upload for skills API Includes evidence for Anthropic API troubleshooting demand.
Anthropic SDK strips directory paths from filenames in multipart uploads — my-skill/SKILL.md becomes SKILL.md, breaking skills.versions.create() Fix Claude Opus 4.6 / Sonnet 4.6 not making parallel tool calls in Message Batches API Includes evidence for Anthropic API troubleshooting demand.
Claude Opus 4.6 / Sonnet 4.6 only calls 1 tool in Batch API with 46 tools, while Opus 4.5 correctly calls 39+ tools in parallel Fix Anthropic API 400 error when using service_tier through Portkey gateway Includes evidence for Anthropic API troubleshooting demand.
Claude API 400 Bad Request — service_tier rewritten to deprecated 'speed' field Fix Anthropic API streaming responses that end abruptly without message_stop event when using tool_use with large JSON payloads Includes evidence for Anthropic API troubleshooting demand.
Streaming responses interrupted mid-transmission — connection closes without message_stop event Fix Anthropic SDK stripping directory paths from filenames during multipart file uploads, causing 400 errors with skills.versions.create() Includes evidence for Anthropic API troubleshooting demand.
400 invalid_request_error — skills.versions.create() requires SKILL.md inside top-level directory