Add PropagateMessages option to WolframLanguageToolEvaluate

[rhennigan]

Summary

• Adds a PropagateMessages option to WolframLanguageToolEvaluate that controls whether messages from sandboxed evaluation are propagated to the calling kernel or silenced with Quiet
• When suppressed kernel messages accumulate and hit the General::messages limit, they can corrupt tool output; propagating them avoids this issue
• Defaults to automatic resolution based on $EvaluationEnvironment: off in "Session" (existing behavior), on in other environments (e.g. scripts, MCP servers)
• Adds .mcp.json to .gitignore

Test plan

• Run PropagateMessages test: verify that WolframLanguageToolEvaluate["1/0", Method -> "Session", "PropagateMessages" -> True] issues Power::infy externally and includes it in the result string
• Run PropagateMessages-Session test: verify that with $EvaluationEnvironment = "Session" and Automatic, no external messages are issued
• Run PropagateMessages-OtherEnvironment test: verify that with $EvaluationEnvironment = "Script" and Automatic, messages propagate externally
• Run PropagateMessages-Workaround test: verify that a complex FullSimplify/Integrate expression with PropagateMessages -> True does not produce General::messages in the output
• Verify existing tests still pass (message formatting, print handling, regression tests)

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR adds a PropagateMessages option to WolframLanguageToolEvaluate to control whether messages from sandboxed evaluation should be propagated to the calling kernel or silenced. The feature addresses an issue where suppressed kernel messages can accumulate and hit the General::messages limit, corrupting tool output. The option uses automatic resolution based on $EvaluationEnvironment: disabled in "Session" environments (preserving existing behavior) and enabled in other environments like scripts and MCP servers.

Changes:

• Added PropagateMessages option with automatic resolution based on execution environment
• Modified message handling to conditionally propagate or suppress messages
• Added comprehensive tests for the new option including automatic resolution behavior
• Added .mcp.json to .gitignore for local configuration

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 3 comments.

File	Description
Source/Chatbook/Sandbox.wl	Implements PropagateMessages option with automatic resolution, modifies evaluationData and message handler to support message propagation
Tests/WolframLanguageToolEvaluate.wlt	Adds tests for PropagateMessages with True/Automatic values and automatic resolution behavior, updates TestID line numbers
.gitignore	Adds .mcp.json to ignored files

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

The tests use "PropagateMessages" -> Automatic, but the getOption function on line 263 only accepts True|False as valid values. When Automatic is passed, it will match the catch-all pattern on line 264 and throw an InvalidOptionValue error, causing these tests to fail.

To fix this, either:

1. Add Automatic to the accepted pattern on line 263: propagate: True|False|Automatic
2. Or change the tests to omit the option entirely (relying on $$unspecified to trigger automatic resolution)

Suggested change

	getOption[ "PropagateMessages", propagate: True|False ] := propagate;
	getOption[ "PropagateMessages", propagate: True|False|Automatic ] := propagate;

[Copilot]

Missing space after comma. Should be Method -> "Session", "PropagateMessages" instead of Method -> "Session","PropagateMessages".

Suggested change

	WolframLanguageToolEvaluate[ "First[]", Method -> "Session","PropagateMessages" -> Automatic ]
	WolframLanguageToolEvaluate[ "First[]", Method -> "Session", "PropagateMessages" -> Automatic ]