Error message: JSON Parse error: Expected '}' #12425

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1. Starlight0798

   added

   bugSomething isn't workingSomething isn't working

   on Feb 6, 2026
2. github-actions

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   rekram1-node

   on Feb 6, 2026
3. github-actions commented on Feb 6, 2026

   

   github-actionsBot

   on Feb 6, 2026 – with GitHub Actions

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   This issue might be a duplicate of existing issues. Please check:

   • [BUG] openai/gpt-5.2-codex Error message: JSON Parse error: Unterminated string errors #10755: JSON Parse error: Unterminated string during normal operation with gpt-5.2-codex
   • Write tool JSON parsing error with large files and special characters #11630: Write tool JSON parsing error with large files and special characters
   • Agent unable to save due to malformed write payload #12412: Plan mode unable to save due to malformed write payload (JSON Parse error)
   • Incomplete JSON when writing out files #5890: Incomplete JSON when writing out files with Claude Opus - exact error "Expected '}'"
   • [aws bedrock: anthropic opus 4.1] The arguments provided to the tool are invalid: Invalid input for tool write: JSON parsing failed: Text #1803: AWS Bedrock Anthropic Opus JSON parsing failed on write tool
   • JSON parsing failed: Text #2188: JSON parsing failed with "Expected '}'" - exact same error message
   • Infinite retry loop when StreamIdleTimeoutError occurs during tool input generation #12234: Infinite retry loop when StreamIdleTimeoutError occurs during tool input generation
   • [BUG] Write tool continously getting aborted #11079: Write tool continuously getting aborted with Claude Sonnet 4.5
   • always stuck at “Preparing write...” #11112: Agent stuck at "Preparing write..." showing infinite retry loop pattern
   • 🐛 Bug Report: MCP Tool JSON Parsing Errors on OpenCode (GLM-4.7) #8102: MCP Tool JSON Parsing Errors where model produces invalid JSON arguments
   • [Bug] JSON Parse Error with Zhipu GLM-4.7: Stream chunks are concatenated incorrectly #7692: JSON Parse error "Expected '}'" with stream chunk concatenation issues

   These issues share your core symptoms:

   1. JSON parsing errors in write tool payloads
   2. Agent generating malformed JSON and unable to recover
   3. Infinite retry loops when write tool fails
   4. Affects multiple LLM models (Claude, Gemini, etc.)
   5. Same version patterns and error signatures

   Feel free to ignore if your specific case differs, but these likely share the same root cause.
4. NachoFLizaur commented on Feb 6, 2026

   

   NachoFLizaur

   on Feb 6, 2026

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   I've encountered this error in the past and the cause of this is most likely that the agent is trying to write more than the model's output token limit (the global default is set to 32K tokens in opencode).

   You could try getting the model to write in smaller chunks or if not setting OPENCODE_EXPERIMENTAL_OUTPUT_TOKEN_MAX to a higher value to see if that solves the issue.

   👍React with 👍5Reacted by minicybersheep, Chindriș Mihai - Alexandru, tensility, Piotr Franczyk and Ming Wang
5. Starlight0798 commented on Feb 6, 2026

   

   Starlight0798

   on Feb 6, 2026

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   I've encountered this error in the past and the cause of this is most likely that the agent is trying to write more than the model's output token limit (the global default is set to 32K tokens in opencode).

   You could try getting the model to write in smaller chunks or if not setting OPENCODE_EXPERIMENTAL_OUTPUT_TOKEN_MAX to a higher value to see if that solves the issue.

   thanks, i will try
6. github-actions commented on Apr 8, 2026

   

   github-actionsBot

   on Apr 8, 2026 – with GitHub Actions

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   To stay organized issues are automatically closed after 90 days of no activity. If the issue is still relevant please open a new one.
7. github-actions

   closed this as completedon Apr 8, 2026