feat(github): replace broad MCP toolsets with a curated tool allowlist - #106
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Copilot review overview
🟡 Changes recommended
Removing exposed tools is breaking and requires a major version bump under repository conventions.
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Review effort: Balanced
Findings: 1
Open (1)
What changed in this PR
Narrows the GitHub MCP server’s exposed tools to reduce mutation and prompt-injection risk.
Changes:
- Replaces broad toolsets with four toolsets and 42 explicit tools.
- Documents the curated tool configuration.
- Updates plugin metadata and version.
| File | Description |
|---|---|
github/README.md |
Documents enabled and excluded tools. |
github/.mcp.json |
Defines the curated MCP allowlist. |
github/.claude-plugin/plugin.json |
Updates description and version. |
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Actionable comments posted: 3
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Inline comments:
In `@github/.claude-plugin/plugin.json`:
- Line 4: Update the plugin’s version in the `version` field of `plugin.json` to
`2.0.0` to reflect the breaking removal of MCP tools.
In `@github/.mcp.json`:
- Around line 8-9: Remove the unsupported check_dependency_vulnerabilities entry
from the X-MCP-Tools allowlist in the GitHub MCP configuration; leave the other
tool entries unchanged.
In `@github/README.md`:
- Around line 37-38: Update the README wording around repository-mutating tools
to distinguish local Git file and branch work from GitHub repository lifecycle
actions; direct readers to GitHub for repository creation, forks, deletion,
merges, and workflow triggers.
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github/.claude-plugin/plugin.jsongithub/.mcp.jsongithub/README.md
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Scope the GitHub MCP server to the tools actually used across recent sessions, dropping repository-mutating writes, merges, workflow triggers, and unused toolsets (discussions, labels, projects, orgs, secret protection, copilot) to shrink the prompt-injection blast radius. Assisted-by: LLM
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Copilot review overview
🟡 Changes recommended
The breaking removals need a major version bump, and the configured inventory does not match the PR summary.
Get a fresh assessment by requesting another Copilot review.
Review effort: Balanced
Findings: 1
Resolved since last review (1)
| "X-MCP-Toolsets": "gists,code_security,security_advisories,dependabot,github_support_docs_search", | ||
| "X-MCP-Tools": "actions_get,actions_list,get_job_logs,get_file_contents,search_code,list_commits,get_commit,list_releases,list_tags,get_latest_release,get_release_by_tag,get_tag,search_repositories,search_commits,list_branches,pull_request_read,search_pull_requests,list_pull_requests,create_pull_request,update_pull_request,pull_request_review_write,add_comment_to_pending_review,add_reply_to_pull_request_comment,issue_read,search_issues,list_issues,issue_write,add_issue_comment,update_issue_comment,sub_issue_write,list_issue_types,list_issue_fields,get_me,get_teams,get_team_members,search_users,list_notifications,get_notification_details,dismiss_notification,manage_notification_subscription,check_dependency_vulnerabilities" |
Summary
X-MCP-Toolsetsheader (about 95 tools) with 4 whole toolsets (gists,code_security,security_advisories,dependabot) plus an explicitX-MCP-Toolsallowlist of 42 tools. The list comes from an audit of GitHub MCP tool calls across all three Claude Code profiles over the last ~30 days, plus the tools that thetriage-prs,pr-review-toolkitandgitplugins declare.push_files,create_or_update_file,delete_file,create_branch,create_repository,fork_repository,delete_repository), as well asmerge_pull_request,update_pull_request_branch,actions_run_trigger,mark_all_notifications_read,manage_repository_notification_subscriptionandlist_repository_collaborators. Also drop the discussions, labels, projects, orgs, secret_protection and copilot toolsets. None of these was called in the audit window, and removing them shrinks what a prompt-injected PR or comment could trigger.pkg/http/handler.go(InventoryFiltersForRequest) confirms that a non-emptyX-MCP-Toolsetsreplaces thedefaulttoolset, andX-MCP-Toolsadds only the names listed. Bump the version to 1.5.0 and update the README and description.Test plan
claude plugin validate ./githubandclaude plugin validate .github/README.mduvx skillsaw --strict/mcpshowsplugin:github:githubconnected. An unknown tool name would return HTTP 400.+githuband confirmpush_files,merge_pull_request,delete_repository,actions_run_trigger, the Copilot tools, and the discussion, label, project and secret-scanning tools are absent, while gist, code-scanning, advisory and Dependabot tools are present./github:triage-prsand/pr-review-toolkit:review-pragainst a real PR with no tool-not-found errors.This PR was written in part with the assistance of generative AI.
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