Opengist MCP Server

opengist-mcp

A Model Context Protocol (MCP) server for Opengist, the self-hosted pastebin powered by Git.

Lets MCP clients like Claude Code, Claude Desktop or Codex read, search, create, update and delete gists on your own Opengist instance: file contents and revisions, commit history, forks and likes, plus your user account.

📖 Full documentation at opengist-mcp.ni-c.de

Note: this server talks to the Opengist REST API under /api, which is available in recent Opengist releases and enabled by default (api.enabled). A running instance serves its own OpenAPI spec at GET /api/openapi.yaml — compare it against your version if a tool behaves unexpectedly.

Requirements

• Node.js 22 or newer

• An Opengist instance with the REST API enabled

• An Opengist Personal Access Token (Settings → Access Tokens). Scopes:

  • gist:read — read gists, including your private and unlisted ones
  • gist:write — create, update, delete and fork gists
  • user:read — read your own account
  • user:write — only needed for set_gist_like

  A token without gist:read still works, but the API then silently returns only public gists instead of failing.

Configuration

The token is read once at startup and then removed from process.env, so it is not visible to child processes. Use https:// for anything but a loopback address — over plain http the token and every gist travel in cleartext.

If your instance's external-url is not configured, the URLs Opengist reports (and this server passes through) point at localhost. Set external-url / OG_EXTERNAL_URL on the instance so links are usable.

Installation

Claude Code

claude mcp add opengist -s user \
  -e OPENGIST_URL=https://gist.example.com \
  -e OPENGIST_TOKEN=og_your_token \
  -- npx -y opengist-mcp

Claude Desktop

claude_desktop_config.json:

{
  "mcpServers": {
    "opengist": {
      "command": "npx",
      "args": ["-y", "opengist-mcp"],
      "env": {
        "OPENGIST_URL": "https://gist.example.com",
        "OPENGIST_TOKEN": "og_your_token"
      }
    }
  }
}

Codex

~/.codex/config.toml:

[mcp_servers.opengist]
command = "npx"
args = ["-y", "opengist-mcp"]
env = { OPENGIST_URL = "https://gist.example.com", OPENGIST_TOKEN = "og_your_token" }

Docker

docker run --rm -i \
  -e OPENGIST_URL=https://gist.example.com \
  -e OPENGIST_TOKEN=og_your_token \
  ghcr.io/ni-c/opengist-mcp:latest

-i is required — the transport is stdio. Do not add -t; a TTY corrupts the protocol stream.

From source

git clone https://github.com/ni-c/opengist-mcp.git
cd opengist-mcp
npm install
npm run build

Tools

Reading

Writing

Safety

• Irreversible actions need a server-generated token. delete_gist, delete_gist_files and widening a gist's visibility refuse the first call and return a random, single-use token that expires after five minutes. A plain confirm: true flag could be set by the model on its own, or be talked into it by text inside a gist; a token that only ever appeared in a previous tool result cannot. The token for delete_gist_files is bound to the exact set of filenames, so a confirmation for one file cannot be replayed to delete another.
• Publishing content needs the same token. Creating a public or unlisted gist, and writing files into a gist that already is one, are disclosure events: whatever the model has in its context becomes readable by others and cannot be withdrawn from anyone who already saw it. Both refuse the first call. The token is bound to the exact content, so a confirmation for one file cannot be replayed with a second one attached. A call that makes the gist private in the same breath is not a disclosure and needs no token.
• Confirmations are checked after validation. A call that could not succeed anyway is reported as the input error it is, rather than first costing a confirmation round-trip.
• Confirmation prompts never quote gist text. Titles, descriptions, topics and filenames are user-supplied and could carry instructions aimed at manufacturing a confirmation, so refusals show only server-side metadata (visibility, file count, dates).
• update_gist cannot delete a file. The Opengist API deletes a file when its entry is null or carries neither content nor filename — exactly the shape a sloppily built object has. This server therefore never exposes the raw file map; it accepts explicit write/rename operations and asserts before sending that no entry could be read as a deletion. Files you do not mention are left untouched.
• Typos cannot silently duplicate a file. A write to a filename that does not exist is refused unless allowCreate: true is passed, and the refusal names a case-insensitive near match (readme.md vs README.md).
• Gist content is untrusted input. Every response that carries file content is tagged with a note saying so. Treat gist text as data, never as instructions.
• Results are bounded. File contents are capped per file and against an overall budget, commits and forks are omitted by default, binary files are not dumped as text, and every truncation is reported together with the call that fetches the rest. search_gists states how much it scanned and marks incomplete results explicitly.
• Requests are hardened. Redirects are refused so the bearer token cannot be replayed to another host, every request carries a timeout, path parameters reject ./.. and are URL-encoded, and upstream error bodies are truncated with HTML error pages dropped entirely.
• Residual risk: OPENGIST_READ_ONLY and the confirmation tokens are client-side guards. The real boundary is the scope of your access token and the permission prompts of your MCP host. A token limited to gist:read/user:read cannot write, whatever the model attempts.

Development

npm install
npm run build
npm test
npm run lint

Releasing

Bump the version in package.json and server.json, move the ## [Unreleased] section of CHANGELOG.md to the new version, commit, then push a tag:

git tag -a v0.1.0 -m "v0.1.0"
git push origin main v0.1.0

The release workflow verifies that the tag matches the package version, publishes to npm via OIDC trusted publishing (no long-lived token), waits for the container image to appear on GHCR, registers the release in the MCP registry and creates a GitHub release from the changelog section.

If the registry step fails, fix it on main and dispatch mcp-registry.yml — never re-run the tagged job, which checks out the immutable tag.

Documentation

The full guide, tool reference and security notes live at opengist-mcp.ni-c.de (source in docs/).

License

MIT