AI_InvalidToolInputError: Invalid input for tool write

[RanaMoizHaider]

AI_InvalidToolInputError: Invalid input for tool write: Type validation failed: Value: {}.
Error message: [
  {
    "code": "invalid_type",
    "expected": "string",
    "received": "undefined",
    "path": [
      "filePath"
    ],
    "message": "Required"
  },
  {
    "code": "invalid_type",
    "expected": "string",
    "received": "undefined",
    "path": [
      "content"
    ],
    "message": "Required"
  }
]

OpenCode v0.3.110
GitHub Copilot - Claude Sonnet 4

[thdxr]

try again in latest

[rekram1-node]

[automated] Closing due to 90+ days of inactivity. Feel free to reopen if you still need this!

[harmeet]

This issue still exists as of Feb 22, 2026.

Reproduced with mlx-community/Qwen3-Coder-Next-4bit with mlx_lm.server on Apple M4.

Error:

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

Opened a PR with a one-line fix: #14744