Fix grok code fast can't read parts of files

[UriZafrir]

Related GitHub Issue

Closes:
#8146

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• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
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Important

shouldUseSingleFileRead in single-file-read-models.ts now always returns false, disabling single file read for all models.

• Behavior:
  • shouldUseSingleFileRead in single-file-read-models.ts now always returns false, disabling single file read for all models.
• Misc:
  • Removes unused parameter modelId from shouldUseSingleFileRead.

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[roomote]

Thank you for your contribution! I've reviewed the changes and found several issues that need attention. While this fix addresses the immediate problem by disabling the single-file read mode for all models (allowing Grok to use the full read_file tool with line range support), there are some concerns about the implementation approach and missing documentation.

[roomote]

Is this intended as a permanent fix? With this change, shouldUseSingleFileRead() always returns false, making this function and the entire simpleReadFileTool effectively dead code. If this is the final solution, should we consider removing this function and all related code entirely?

Alternatively, would it be better to fix the simpleReadFileTool to support line ranges for models that truly need the simplified format?

[roomote]

The JSDoc comment still says "Check if a model should use single file read format" and "@returns true if the model should use single file reads", but the function now always returns false. Could you update the documentation to reflect the current behavior?

Suggested change

	* @param modelId The model ID to check
	/**
	* Check if a model should use single file read format
	* @param modelId The model ID to check
	* @returns false - Single file read mode is currently disabled for all models
	*/

[roomote]

The modelId parameter is now prefixed with underscore to indicate it's unused, but the function still accepts it. If we're keeping this function, should we deprecate it properly with a @deprecated tag? Or if this is temporary, could you add a TODO comment explaining the plan?

[daniel-lxs]

Closing, see #8146 (comment)