GitHub MCPサーバー

GitHub MCP Server (@sumirati/mcp-github)

A modern, 2026 AI-native Model Context Protocol (MCP) server for GitHub REST API, engineered for autonomous AI agents and developer workflows.

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What makes v2 Unique: The 2026 5-Tool Hybrid Standard

In early MCP servers, exposing 50–100+ eager tool definitions flooded every LLM turn with thousands of redundant schema tokens ("System Prompt Tax") and degraded reasoning coherence.

@sumirati/mcp-github solves this with a 5-Tool Hybrid Surface:

• Glama TDQS Coherence Tier A (5/5): By exposing exactly 5 tools to the client, the server sits in the ideal 3–15 tool coherence sweet spot.
• Ultra-Lean System Prompt Tax: Drops schema overhead from 23,112 tokens (92,447 B) down to 1,125 tokens (4,498 B) (95.1% reduction), preserving context windows and maximizing LLM prompt-cache hits.
• Zero-Hop Hourly Drivers: The 3 operations developers and agents use constantly (get_file_contents, get_repository, get_commit) remain eager tools for instant zero-hop execution.
• 100% Platform Access on Demand: The entire platform surface of 83 actions across 13 domains is accessible on-demand via dynamic action discovery (github_find_actions $\rightarrow$ github_execute_action), delivering 91%–99% token savings with default high-density Markdown tables and summaries (format: "markdown" | "json").
• Resilient Fallback: If an agent directly invokes any catalog action name (e.g. list_pull_requests), the server dynamically executes it with full input validation and projection.

LLM Prompt Context (5-Tool Hybrid Surface):
├── 1. github_find_actions(query, [domain], [format])     [Meta Discovery]
├── 2. github_execute_action(action, params, [format])   [Meta Dynamic Execution]
├── 3. get_file_contents(owner, repo, path)               [Eager Daily Driver #1]
├── 4. get_repository(owner, repo)                        [Eager Daily Driver #2]
└── 5. get_commit(owner, repo, ref)                       [Eager Daily Driver #3]

Under the hood (Dynamic Registry):
└── 83 Curated Actions across 13 Domains (grounded in GitHub REST API 2022-11-28)

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Core Capabilities Across 13 Domains

1. Repositories & Branch Governance (repositories, 12 actions): Full repository lifecycle, branch management, branch protection rules (get_branch_protection), file reading (auto Base64-decoded, symbol outlines, line slicing), single-file commits, and forks.
2. Commits & Commit Statuses (commits, 6 actions): Commit history, token-capped commit diffs (get_commit), atomic multi-file commits via Git Trees API (create_commit, push_files), and commit status checks.
3. Pull Requests & Code Reviews (pull-requests, 11 actions): PR lifecycle (create, update, merge), review comments, inline diff reviews, and unified diff inspection with lockfile filtering.
4. Issues & Labels (issues, 8 actions): Issue tracking, upstream indexed filtering, conversation comments, and label management.
5. Project Milestones (milestones, 4 actions): Milestone creation, progress tracking, and deadline management.
6. Collaborators & Permissions (collaborators, 4 actions): Audit and manage repository collaborators and permission levels.
7. Actions Variables & Secrets (variables, 6 actions): Manage repository Actions configuration variables and inspect secret metadata.
8. Gists & Code Snippets (gists, 5 actions): Full gist lifecycle for sharing multi-file code snippets and configurations.
9. GitHub Actions & CI/CD (actions, 10 actions): Workflow inspection, workflow runs, job step breakdown, build artifacts (list_workflow_run_artifacts, get_workflow_run_artifact), smart failure log extraction (get_job_logs), run cancel/rerun, and manual workflow dispatch.
10. Releases & Git Tags (releases, 5 actions): Release publishing, lightweight/annotated tag creation, and release asset inspection.
11. User, Organizations, Teams & Diagnostics (user, 7 actions): Authenticated user identity, organization inspection, team creation (create_team), accessible repositories, and API health/rate-limit diagnostics (system_health_check).
12. Webhooks & Repository Topics (webhooks, 4 actions): Audit repository event webhooks and manage repository topic tags.
13. Security & Dependabot (security, 1 action): Audit Dependabot vulnerability alerts by state and severity.

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Quickstart & Installation

Option 1: Run with npx (No installation needed)

npx -y @sumirati/mcp-github

Option 2: Install Globally

npm install -g @sumirati/mcp-github
mcp-github

Option 3: Local Clone

git clone https://github.com/sumirati/mcp-github.git
cd mcp-github
npm install
npm test
npm start

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Environment Configuration

Variable	Required	Default	Description
GITHUB_PERSONAL_ACCESS_TOKEN	Yes	—	GitHub Personal Access Token (classic or fine-grained)
GITHUB_TOKEN	No	—	Alternative token variable name
GITHUB_API_URL	No	https://api.github.com	Base API URL (or GitHub Enterprise Server)
GITHUB_READ_ONLY	No	false	Enable 3-tier read-only mode (true, 1, yes)
GITHUB_EXPOSE_ALL_TOOLS	No	false	Set to true (or GITHUB_EXPOSE_LEGACY_TOOLS=true) to expose all 83 tools directly on ListTools for legacy clients
MCP_OUTPUT_FORMAT	No	markdown	Default output format for tool execution (markdown or json)

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Client Configuration

Google Antigravity / Claude Desktop / Cursor

Add to your MCP configuration file (mcp_config.json or claude_desktop_config.json):

Using npm / npx (Recommended):

{
  "mcpServers": {
    "github": {
      "command": "npx",
      "args": ["-y", "@sumirati/mcp-github"],
      "env": {
        "GITHUB_PERSONAL_ACCESS_TOKEN": "<your-github-token>",
        "GITHUB_READ_ONLY": "false"
      }
    }
  }
}

Using local clone:

{
  "mcpServers": {
    "github": {
      "command": "node",
      "args": ["/path/to/mcp-github/index.js"],
      "env": {
        "GITHUB_PERSONAL_ACCESS_TOKEN": "<your-github-token>",
        "GITHUB_READ_ONLY": "false"
      }
    }
  }
}

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Complete Action Catalog Reference (83 Actions)

All 83 actions feature strict Zod input validation and 2-tier output projection:

1. The 5 Client-Exposed Tools (Hybrid Mode)

Tool	Type	Description
github_find_actions	Meta	Search and discover available GitHub operations across all 13 domains with compact parameter signatures
github_execute_action	Meta	Execute any discovered GitHub platform action with input validation and token-optimized projection
get_file_contents	Eager	Read raw file contents (auto Base64 decoded), symbol outlines, line ranges, or directory listings at any ref
get_repository	Eager	Retrieve repository metadata, visibility, description, default branch, HTML URL, and counts
get_commit	Eager	Inspect Git commit details, author info, and token-capped file diffs

2. Repositories & Branches (repositories — 12 actions)

Action	Description	Mutating?
search_repositories	Search for repositories across GitHub or within an organization using query qualifiers (e.g. 'org:myorg language:typescript') with capped pagination (max 100). If owner and repository name are known, prefer 'get_repository' for exact O(1) lookup.	No
get_repository	Get repository metadata, visibility, description, default branch, clone URL, and statistics for an exact owner/repo. Use when verifying repository settings or checking default branch name.	No
create_repository	Create a new GitHub repository under the authenticated user account or a specified organization. Requires write permissions and GITHUB_READ_ONLY=false. Auto-initializes with a default README commit unless auto_init is false.	Yes
get_file_contents	Read current file contents, extract symbol outlines ('outline_only: true'), slice line ranges, or list directory entries at a specified git ref. Automatically decodes Base64 into UTF-8. Use 'outline_only: true' first to inspect structure in ~50-100 tokens, then request specific line ranges.	No
create_or_update_file	Create a new file or overwrite an existing file on a branch in a single atomic commit. If updating, provide the file's current blob SHA in 'sha' (or leave empty to auto-resolve). Requires write permissions and GITHUB_READ_ONLY=false.	Yes
delete_file	Delete an existing file from a branch in a git commit. Requires the current blob SHA to guard against concurrent overwrites. Requires write permissions and GITHUB_READ_ONLY=false.	Yes
list_branches	List branches in a repository with protection status and head commit SHAs. Supports upstream filtering by protected status and capped pagination (max 100). If branch name is already known, prefer 'get_branch'.	No
get_branch	Get detailed status of a specific branch, including branch protection rules and latest commit details. Use to verify branch existence or protection policies before merging or deleting.	No
get_branch_protection	Retrieve comprehensive branch protection rules for a specific Git branch, including required status checks, required reviews, admin enforcement, and force-push / deletion restrictions.	No
create_branch	Create a new git branch pointing to a commit SHA or branched from an existing branch (defaults to 'main'). Use before committing changes or opening a pull request. Requires write permissions and GITHUB_READ_ONLY=false.	Yes
delete_branch	Delete a branch from a repository. Protected: explicitly rejects requests to delete the default branch (e.g. 'main') to prevent repository breakage. Requires write permissions and GITHUB_READ_ONLY=false.	Yes
fork_repository	Fork a repository into the authenticated user's account or a specified organization namespace. Use when contributing to upstream projects where direct push access is restricted. Requires write permissions and GITHUB_READ_ONLY=false.	Yes

3. Git Commits & Statuses (commits — 6 actions)

Action	Description	Mutating?
list_commits	List repository commit history chronologically with upstream filtering (sha, path, author, since, until) and capped pagination (max 100). For viewing actual line-by-line diffs of a commit, use get_commit instead.	No
get_commit	Get detailed commit metadata, file modification statistics, and unified diffs for a specific commit SHA or ref. Use when reviewing code changes in a commit or debugging regressions. Diffs are token-budget optimized and truncated at max_diff_lines (default: 400 lines).	No
create_commit	Create an atomic Git commit with multiple created, updated, or deleted files using the GitHub Git Trees API. Use when refactoring, applying multi-file code changes, or updating code and docs together. Avoids multiple individual single-file commits and does not require local git cloning. Requires write permissions and GITHUB_READ_ONLY=false.	Yes
push_files	Alias for 'create_commit': atomically commit additions, modifications, or deletions to multiple files in a single Git commit via the GitHub Git Database API. Requires write permissions and GITHUB_READ_ONLY=false.	Yes
get_commit_status	Get the combined status check state (pending, success, failure) and individual check runs for a commit SHA or branch ref.	No
create_commit_status	Set or update a commit status check (pending, success, failure, error) on a specific commit SHA. Requires write permissions and GITHUB_READ_ONLY=false.	Yes

4. Pull Requests & Code Reviews (pull-requests — 11 actions)

Action	Description	Mutating?
list_pull_requests	List and filter pull requests with upstream indexed parameters (state, head, base) and capped pagination (max 100). To inspect a known PR, prefer 'get_pull_request' with pull_number; for diffs, use get_pull_request_diff.	No
get_pull_request	Get detailed status of a specific pull request including mergeability (clean, dirty, unstable), head/base branch refs, author, and assignees. Use to check if a PR is ready to merge or blocked. Do NOT use to read code changes; use get_pull_request_diff instead.	No
get_pull_request_diff	Retrieve unified git diff for a pull request to review code modifications. Use this tool when analyzing code changes, reviewing patches, or preparing inline comments. Do NOT use for checking PR mergeability or metadata (use get_pull_request instead). Diffs are token-optimized and automatically truncated at max_lines (default: 400 lines) to prevent LLM context overflows.	No
create_pull_request	Create a new pull request from a head branch into a base branch. Requires write permissions and GITHUB_READ_ONLY=false. The head branch must already exist and have at least one commit difference from the base branch.	Yes
update_pull_request	Update an existing pull request's title, body, open/closed state, or base branch. Requires write permissions and GITHUB_READ_ONLY=false.	Yes
merge_pull_request	Merge a pull request into its base branch using merge, squash, or rebase method. Requires write/admin permissions and GITHUB_READ_ONLY=false. Ensure the PR mergeable state is clean before merging.	Yes
list_pull_request_comments	List inline code review comments anchored to specific diff lines of a pull request. Use when inspecting line-by-line review feedback. For overall PR review approvals or change requests, use list_pull_request_reviews instead.	No
create_pull_request_comment	Post an inline review comment anchored to a specific file and line number in the pull request. Requires commit_id, path, and line number in the file. Requires write permissions and GITHUB_READ_ONLY=false.	Yes
create_pull_request_reply	Reply to an existing pull request review comment thread. Requires comment_id of the parent comment. Requires write permissions and GITHUB_READ_ONLY=false.	Yes
list_pull_request_reviews	List formal code reviews (approvals, change requests, comment summaries) submitted on a pull request. Use to check reviewer decisions and approval gates before merging.	No
create_pull_request_review	Submit a formal code review on a pull request with an approval decision (APPROVE, REQUEST_CHANGES, or COMMENT) and optional summary body or inline comments. Requires write permissions and GITHUB_READ_ONLY=false.	Yes

5. Issues & Labels (issues — 8 actions)

Action	Description	Mutating?
list_issues	Search and filter repository issue tickets with upstream indexed parameters (state, labels, assignee, creator, mentioned, milestone, since) and capped pagination (max 100). Filters out pull requests. If the issue number is already known, prefer 'get_issue' for exact O(1) lookup.	No
get_issue	Get full details of a specific issue ticket, including markdown body, assignees, milestone, state reason, and comment count. Use when investigating a bug report or reading issue specifications.	No
create_issue	Create a new issue ticket in a repository with optional labels, assignees, and milestone. Requires write permissions and GITHUB_READ_ONLY=false.	Yes
update_issue	Update an existing issue's title, body, state ('open'/'closed'), state reason ('completed'/'not_planned'), labels, assignees, or milestone. Requires write permissions and GITHUB_READ_ONLY=false.	Yes
list_issue_comments	List discussion comments on an issue ticket chronologically. Use to read conversation history, debugging updates, or user feedback on an issue.	No
create_issue_comment	Add a markdown comment to an issue ticket. Use to reply to discussions, log progress, or provide resolution details. Requires write permissions and GITHUB_READ_ONLY=false.	Yes
list_labels	List all labels configured in a repository with their names, descriptions, and hex color codes. Use to discover available tags before creating or updating issues.	No
create_label	Create a new label in a repository with a name, description, and 6-character hex color code. Requires write permissions and GITHUB_READ_ONLY=false.	Yes

6. Project Milestones (milestones — 4 actions)

Action	Description	Mutating?
list_milestones	List project milestones in a repository with open/closed issue counts and due dates. Use to monitor release roadmaps or locate milestone numbers before associating them with issues or PRs.	No
get_milestone	Get detailed status of a specific milestone, including title, open/closed issues count, creation date, and deadline. Use when reviewing milestone progress or inspecting milestone deadlines.	No
create_milestone	Create a new project milestone with a title, description, and optional due date. Requires write permissions and GITHUB_READ_ONLY=false.	Yes
update_milestone	Update an existing milestone's title, description, state ('open'/'closed'), or due date. Requires write permissions and GITHUB_READ_ONLY=false.	Yes

7. Collaborators & Roles (collaborators — 4 actions)

Action	Description	Mutating?
list_collaborators	List collaborators who have access to a repository along with their assigned roles and permissions. Use to audit team access or check user memberships.	No
get_collaborator_permission	Check a specific user's exact permission level ('admin', 'maintain', 'write', 'triage', 'read', or 'none') on a repository. Use to verify authorization before attempting privileged operations.	No
add_collaborator	Add or invite a GitHub user to collaborate on a repository with a specified permission level. If the user is not an organization member, this sends a collaboration invitation. Requires admin permissions and GITHUB_READ_ONLY=false.	Yes
remove_collaborator	Remove a collaborator from a repository, revoking their direct access. Requires admin permissions and GITHUB_READ_ONLY=false.	Yes

8. Actions Variables & Secrets (variables — 6 actions)

Action	Description	Mutating?
list_actions_variables	List non-sensitive GitHub Actions configuration variables defined on a repository with their values and timestamps. Use for inspecting build environment parameters.	No
get_actions_variable	Get the plain text value and last updated timestamp of a specific GitHub Actions repository variable by name.	No
create_actions_variable	Create a non-sensitive configuration variable for GitHub Actions workflows. Requires write/admin permissions and GITHUB_READ_ONLY=false. For sensitive credentials, use repository secrets instead.	Yes
update_actions_variable	Update the value of an existing non-sensitive GitHub Actions configuration variable. Requires write/admin permissions and GITHUB_READ_ONLY=false.	Yes
delete_actions_variable	Delete a non-sensitive configuration variable from GitHub Actions. Requires write/admin permissions and GITHUB_READ_ONLY=false.	Yes
list_actions_secrets	List GitHub Actions repository secret names and timestamps. Behavioral safety: secret values are permanently masked by GitHub and never returned in plaintext.	No

9. Gists & Code Snippets (gists — 5 actions)

Action	Description	Mutating?
list_gists	List code snippets and gists owned by the authenticated user with file summaries. Use to locate code snippet IDs before reading or editing.	No
get_gist	Get full source code contents, files, and description of a specific GitHub gist by ID. Use to inspect standalone code snippets or configuration templates.	No
create_gist	Create a new public or secret GitHub gist with one or more files. Requires write permissions and GITHUB_READ_ONLY=false.	Yes
update_gist	Update an existing gist's description or modify/rename/delete individual files within the gist. Requires write permissions and GITHUB_READ_ONLY=false.	Yes
delete_gist	Permanently delete a gist by its identifier. Requires write permissions and GITHUB_READ_ONLY=false.	Yes

10. GitHub Actions & CI/CD Observability (actions — 10 actions)

Action	Description	Mutating?
list_workflows	List GitHub Actions CI/CD workflow files configured in a repository (.github/workflows). Use to discover workflow names and IDs before triggering or inspecting runs.	No
list_workflow_run_artifacts	List artifacts produced by a specific GitHub Actions workflow run, including file size, download archive URLs, and expiration timestamps. Use to discover generated build outputs, test logs, or release binaries.	No
get_workflow_run_artifact	Retrieve metadata and download archive URL for a specific GitHub Actions build artifact by its numeric artifact ID. Use when downloading build deliverables or inspecting individual artifacts.	No
list_workflow_runs	List workflow execution runs with status, conclusion ('success', 'failure'), triggering event, and commit SHA. Use to check CI/CD pipeline health or find run IDs.	No
get_workflow_run	Get detailed status, timing, and conclusion for a specific workflow execution run. Use when monitoring CI pipeline completion.	No
list_workflow_run_jobs	List all individual jobs and step breakdown within a workflow run. Use to identify which specific job or step failed during a build.	No
get_job_logs	Fetch plain text execution logs for an Actions job with smart failure extraction and ANSI stripping. Behavioral safety: scans for errors/panics to extract failure blocks and trims massive logs to preserve LLM token context.	No
trigger_workflow	Dispatch a workflow run on a branch or tag via workflow_dispatch event with custom inputs. Requires write permissions and GITHUB_READ_ONLY=false. The target workflow file must define a workflow_dispatch trigger.	Yes
cancel_workflow_run	Cancel a queued or currently executing GitHub Actions workflow run. Requires write permissions and GITHUB_READ_ONLY=false.	Yes
rerun_workflow	Re-execute all jobs in a completed or failed GitHub Actions workflow run. Requires write permissions and GITHUB_READ_ONLY=false.	Yes