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gopls/internal/mcp: add go_rename tool #585

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@arjunmahishi arjunmahishi commented Aug 8, 2025
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This tool uses the LSP server's Rename method to rename Go symbols
(variables, functions, types, etc.) at a specified position. It supports
both preview mode (dryRun: true, default) and actual application
(dryRun: false) of changes across the workspace.

  • Add renameTool() and renameHandler() to the MCP server
  • Support dryRun parameter: true for preview, false to apply changes
  • Add TestMCPRename to test the tool for both dryRun modes
  • Update MCP instructions with go_rename usage examples for both modes

Fixes golang/go#74887

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This PR (HEAD: c9a4e51) has been imported to Gerrit for code review.

Please visit Gerrit at https://go-review.googlesource.com/c/tools/+/694036.

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This tool uses the LSP server's Rename method to rename Go symbols
(variables, functions, types, etc.) at a specified position. It supports
both preview mode (dryRun: true, default) and actual application
(dryRun: false) of changes across the workspace.
- Add renameTool() and renameHandler() to the MCP server
- Support dryRun parameter: true for preview, false to apply changes
- Add TestMCPRename to test the tool for both dryRun modes
- Update MCP instructions with go_rename usage examples for both modes
Fixes golang/go#74887 
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Message from Gopher Robot:

Patch Set 1:

(1 comment)


Please don’t reply on this GitHub thread. Visit golang.org/cl/694036.
After addressing review feedback, remember to publish your drafts!

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This PR (HEAD: 3f86730) has been imported to Gerrit for code review.

Please visit Gerrit at https://go-review.googlesource.com/c/tools/+/694036.

Important tips:

  • Don't comment on this PR. All discussion takes place in Gerrit.
  • You need a Gmail or other Google account to log in to Gerrit.
  • To change your code in response to feedback:
    • Push a new commit to the branch used by your GitHub PR.
    • A new "patch set" will then appear in Gerrit.
    • Respond to each comment by marking as Done in Gerrit if implemented as suggested. You can alternatively write a reply.
    • Critical: you must click the blue Reply button near the top to publish your Gerrit responses.
    • Multiple commits in the PR will be squashed by GerritBot.
  • The title and description of the GitHub PR are used to construct the final commit message.
    • Edit these as needed via the GitHub web interface (not via Gerrit or git).
    • You should word wrap the PR description at ~76 characters unless you need longer lines (e.g., for tables or URLs).
  • See the Sending a change via GitHub and Reviews sections of the Contribution Guide as well as the FAQ for details.

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Message from Arjun Mahishi:

Patch Set 1:

(1 comment)


Please don’t reply on this GitHub thread. Visit golang.org/cl/694036.
After addressing review feedback, remember to publish your drafts!

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Message from Robert Findley:

Patch Set 2:

(2 comments)


Please don’t reply on this GitHub thread. Visit golang.org/cl/694036.
After addressing review feedback, remember to publish your drafts!

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Message from Arjun Mahishi:

Patch Set 2:

(2 comments)


Please don’t reply on this GitHub thread. Visit golang.org/cl/694036.
After addressing review feedback, remember to publish your drafts!

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x/tools/gopls: add symbol rename tool for mcp

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