Write tool called with invalid parameters

Description

I am experimenting with https://github.com/LarsCowe/bmalph

Model: Qwen 3.5 35B-A3B hosted in LM Studio

At some point during the conversation the below mentioned error message is presented to me

Plugins

how to obtain a list?

OpenCode version

1.2.27

Steps to reproduce

Setup a new git repo with https://github.com/LarsCowe/bmalph
Use the analyst agent
Answer the questions the agent asks you

The next output is

~ Preparing write...
Error: The write tool was called with invalid arguments: [
  {
    "expected": "string",
    "code": "invalid_type",
    "path": [
      "content"
    ],
    "message": "Invalid input: expected string, received undefined"
  },
  {
    "expected": "string",
    "code": "invalid_type",
    "path": [
      "filePath"
    ],
    "message": "Invalid input: expected string, received undefined"
  }
].
Please rewrite the input so it satisfies the expected schema.

Screenshot and/or share link

No response

Operating System

Windows

Terminal

Project Bluefins default terminal

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

AI_InvalidToolInputError: Invalid input for tool write: Type validation failed #946: Similar AI_InvalidToolInputError with invalid_type on content and filePath fields when the write tool receives undefined values
Agent unable to save due to malformed write payload #12412: Write tool called with malformed/invalid payload (filePath and content not passed correctly)
always stuck at “Preparing write...” #11112: Stuck at "Preparing write..." which may share the same root cause

Please review those issues to see if your problem is already tracked there.

Could be related to #11112 but I'm not sure

✗ write failed
Error: The write tool was called with invalid arguments: [
  {
    "expected": "string",
    "code": "invalid_type",
    "path": [
      "content"
    ],
    "message": "Invalid input: expected string, received undefined"
  },
  {
    "expected": "string",
    "code": "invalid_type",
    "path": [
      "filePath"
    ],
    "message": "Invalid input: expected string, received undefined"
  }
].

Same problem. Version: 1.2.27

Same, Claude 4.6 and Mac

similar issue
The write tool was called with invalid arguments: SchemaError(Missing key
at ["content"]).
Please rewrite the input so it satisfies the expected schema.

opencode 1.14.28

The skill tool was called with invalid arguments: SchemaError(Missing key
at ["name"]).
Please rewrite the input so it satisfies the expected schema.

Similar issue here

~ Preparing write...
The write tool was called with invalid arguments: SchemaError(Missing key
  at ["filePath"]).
Please rewrite the input so it satisfies the expected schema.

I am using Opencode, Ollama, VSCode and Qwen 3.5.

不用zen或go里模型，这个不能写入问题一直存在，没法解决，永远在循环报错

Hi Everyone! I am using opencode 1.15.7, lmstudio and Qwen 3.6 27B and same error.

Hi Everyone, Facing the same

Opencode: 1.15.10
Model: QWEN 3.5 122B A10B

From my analysis, Model hallucinate and failed to send tools argument. When I enquired about missing of tools call without argument, it believe, the argument was sent in the tool call response. But the argument was missing. I tried to handle this via system prompt, didn't help.

seeking for a help. Thanks.

Opened a PR that should help with this — #30224. When the model sends wrong argument keys (e.g. fileContent instead of content), the error fed back now tells it which keys it should have used vs what it sent, so it can self-correct on the next turn instead of hitting the retry limit.

To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.

I'm still experiencing the same issue.

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Write tool called with invalid parameters #18131

Description

Plugins

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Steps to reproduce

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Operating System

Terminal

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Write tool called with invalid parameters #18131

Description

Description

Plugins

OpenCode version

Steps to reproduce

Screenshot and/or share link

Operating System

Terminal

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github-actions commented on Mar 18, 2026

spotlesscoder commented on Mar 18, 2026

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github-actions commented on Aug 1, 2026

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