crush fix(write): handle array content from GLM and Qwen models

Problem

Some models (GLM 4.6, Qwen 3 Coder 480B) send the write tool's content parameter as an array of strings instead of a single string, causing validation errors:

The write tool was called with invalid arguments:
"Invalid input: expected string, received array"

Solution

This PR adds a custom UnmarshalJSON method to WriteParams that:

✅ Accepts string content (existing behavior, fully backward compatible)
✅ Accepts array of strings (joins with newlines)
✅ Provides clear error messages for invalid types

The fix is transparent to models that send strings and enables compatibility with models that send arrays.

Affected Models

GLM 4.6
Qwen 3 Coder 480B
Any other models that send array content

Testing

Tested with Venice.ai models via VeniceCode (Venice.ai-optimized fork of Crush).

Code Changes

Adds 35 lines to internal/agent/tools/write.go:

Custom UnmarshalJSON method for WriteParams
Handles both string and array formats
Zero breaking changes

fix(write): handle array content from GLM and Qwen models

Problem

Solution

Affected Models

Testing

Code Changes

Related