Write tool called with invalid parameters

[spotlesscoder]

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

1. Setup a new git repo with https://github.com/LarsCowe/bmalph
2. Use the analyst agent
3. 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

[github-actions]

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.

[spotlesscoder]

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

[darluc]

✗ 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

[haoxuanpan]

Same, Claude 4.6 and Mac

[nirolfa]

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

[cliu639]

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

[f-g-s]

~ 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.

[striver8]

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