fix(mcp): pretty-print tool responses in UI

[hannesrudolph]

Summary

Prevents UI hangups caused by large outputs being rendered as 1 line.

Improve MCP tool output readability in the chat UI by pretty-printing JSON responses when expanded while preserving raw output for copy.

Before	After

Changes

• Format MCP response JSON (including escaped/double-encoded JSON) in
• Preserve raw response for copy via in
• Add UI tests in

---

Important

Enhance JSON response readability in McpExecution.tsx by pretty-printing and preserving raw data for copying, with tests added for verification.

• Behavior:
  • Pretty-print JSON responses in McpExecution.tsx when expanded, including handling of escaped and double-encoded JSON.
  • Preserve raw JSON response for copying.
• Functions:
  • Add looksLikeJson, looksLikeEscapedJsonBlob, tryParseJsonValue, and tryUnescapeJsonBlob in McpExecution.tsx to handle JSON parsing and formatting.
• Tests:
  • Add tests in McpExecution.spec.tsx to verify pretty-printing of minified, escaped, and double-encoded JSON, and handling of non-JSON responses.

^{This description was created by for ae18182. You can customize this summary. It will automatically update as commits are pushed.}

[ghost]

Oroocle   See task on Roo Cloud

Re-review complete. No new issues flagged.

• Restrict the unescape fallback so backslashes in non-JSON responses do not get mutated before formatting.

Previous reviews

• fcdad69: Review #1
• 83b5423: Review #2

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

[ghost]

The unescape fallback (replaceAll(\\\\, \\).replaceAll('\\"', '"')) is fairly aggressive and can change the meaning of responses that contain backslashes but are not actually escaped JSON blobs; consider gating this branch on a stricter pattern (eg starting with {\" or [{\") so we do not pretty-print mutated content.

_{Fix it with Roo Code or mention @roomote and request a fix.}