[Bug] Anthropic API Error: Invalid Context Request (`/context` returned 400)

Resolved 💬 5 comments Opened Sep 20, 2025 by ariccio Closed Jan 9, 2026

Bug Description
I used the /context command, and it returned an error 400 from the API?

Environment Info

  • Platform: darwin
  • Terminal: Apple_Terminal
  • Version: 1.0.120
  • Feedback ID: e3bdf9e8-e28e-4df9-9ac2-8741f2d01b02

Errors

[{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.139.content.0: When thinking is disabled, an `assistant` message in the final position cannot contain `thinking`. To use thinking blocks, enable `thinking` in your request.\"},\"request_id\":\"req_011CTLK54w9XLMYuwBfczGqu\"}\n    at i9.generate (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:992:2412)\n    at IP.makeStatusError (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:1009:2131)\n    at IP.makeRequest (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:1009:5344)\n    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)\n    at async pG1 (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:1709:346)\n    at async NI1 (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:2581:116)\n    at async tQ5 (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:2581:1869)\n    at async Promise.all (index 5)\n    at async nXB (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:2581:2244)\n    at async Object.call (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:2581:4628)","timestamp":"2025-09-20T20:50:09.051Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.139.content.0: When thinking is disabled, an `assistant` message in the final position cannot contain `thinking`. To use thinking blocks, enable `thinking` in your request.\"},\"request_id\":\"req_011CTLK56Qwkhx53b2fznWJu\"}\n    at i9.generate (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:992:2412)\n    at IP.makeStatusError (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:1009:2131)\n    at IP.makeRequest (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:1009:5344)\n    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)\n    at async D9B (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:1709:729)\n    at async NI1 (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:2581:161)\n    at async tQ5 (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:2581:1869)\n    at async Promise.all (index 5)\n    at async nXB (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:2581:2244)\n    at async Object.call (file:///Users/alexanderriccio/.nvm/versions/node/v20.19.4/lib/node_modules/@anthropic-ai/claude-code/cli.js:2581:4628)","timestamp":"2025-09-20T20:50:09.420Z"}]

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