fix: clarify read_file tool single-file limitation for specific models

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This PR attempts to address Issue #8858. Feedback and guidance are welcome.

Problem

The read_file tool documentation was misleading for models that use the simplified single-file format (like grok-code-fast-1). The documentation incorrectly suggested these models could read multiple files when they actually cannot.

Solution

• Updated getSimpleReadFileDescription() to explicitly state that only ONE file can be read at a time
• Added clear documentation about using separate tool calls for multiple files
• This ensures users of models like grok-code-fast-1 understand the limitation upfront

Testing

• All existing tests pass
• Linting and type checks pass

Fixes #8858

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Important

Clarifies single-file limitation in getSimpleReadFileDescription() for specific models in simple-read-file.ts.

• Documentation:
  • Updated getSimpleReadFileDescription() in simple-read-file.ts to clarify that only one file can be read at a time.
  • Added note on using separate tool calls for multiple files.
• Testing:
  • All existing tests pass.
  • Linting and type checks pass.

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Review Complete ✅

No issues found. The PR correctly clarifies the single-file limitation in the simplified read_file tool documentation.

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No issues found.