feat: remove MCP SERVERS section from system prompt

[daniel-lxs]

Summary

Removes the MCP SERVERS section from the system prompt since MCP tools are now included in the native tools array sent with API requests.

Problem

MCP tools were being duplicated in two places:

1. In the native tools array sent with API requests (via getMcpServerTools())
2. In the system prompt text (via getMcpServersSection())

This duplication was unnecessary and added extra tokens to the system prompt.

Solution

• Delete src/core/prompts/sections/mcp-servers.ts
• Remove getMcpServersSection export from sections/index.ts
• Remove MCP section from system.ts prompt template
• Update related tests and snapshots

MCP tools continue to work via the native tools array sent in API requests.

Test Plan

• All existing tests pass
• MCP tools still function correctly via native tool array

Resolves COM-550

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Important

Removes MCP SERVERS section from system prompt, relying on native tools array for MCP tools.

• Behavior:
  • Removes MCP SERVERS section from system prompt in system.ts.
  • Deletes mcp-servers.ts and removes getMcpServersSection export from sections/index.ts.
  • Updates related tests and snapshots in add-custom-instructions.spec.ts and useMcpToolTool.spec.ts.
• Testing:
  • Ensures MCP tools function via native tool array.
  • All existing tests pass.

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[roomote]

Rooviewer   See task on Roo Cloud

Reviewed latest commit (e1d84b6) which adds the missing nativeArgs property to the fuzzy matching test, ensuring consistency with all other tests in the file.

No issues found.

Previous reviews

• 8964609: Review #1
• 492233b: Review #2

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[mrubens]

@roomote can you fix the conflicts here?

[roomote]

Fixaroo   See task on Roo Cloud

Resolved merge conflicts with main. All local checks passed.

_{View commit | Revert commit}

[mrubens]

@roomote Still a failing test

[roomote]

Fixaroo   See task on Roo Cloud

Fixed the failing test by adding missing nativeArgs to the fuzzy matching test case. All local checks passed.

_{View commit | Revert commit}