Claude fails to return valid structured output
LLM apps4 posts from 3 people4d active+33 posts in the last 7 days, 0 the 7 days before (rising)
Posts per day
The posts behind it
4, newest firstCompanies and products named
| Company or product | Posts naming it |
|---|---|
| 4 | |
| 3 | |
| 2 | |
| 2 | |
| 2 | |
| 2 |
About this problem
Evidence
4 posts from 3 people in 3 places, about 1 a week over 17 days. Mostly on langchain-ai/langchain, run-llama/llama_index, modelcontextprotocol/servers. Tools named alongside: DeepSeek, OpenAI, Perplexity, Ollama.
Frustration Frustration 0 of 3· Seen on GitHub issues
How it was grouped
Posts that state a pain and match the "structured-output" rule about Claude. First post Sep 7, 2026, latest Sep 23, 2026. Corroborated: 3 or more posts from 2 or more people or places. Method
The same problem elsewhere
Other Claude problems
- Claude app gets 1 and 2 star reviews (34)
- Claude runs out of context on real work (2)
- Claude upgrades break working setups (9)
- Claude login, SSO or OAuth breaks (3)
- Trouble with Claude desktop (3)
- Claude builds are slow or flaky (2)
- Claude lock-in makes switching costly (2)
- Claude writes buggy code that is hard to review (2)
- Claude permissions are confusing and error-prone (2)
- Claude state drifts from what is really deployed (2)
History
- 2026-09-25 Momentum: new to rising
- 2026-09-25 Added: Claude fails to return valid structured output (3 posts)