wg21-wiki-mcp

A local Model Context Protocol (stdio) server that gives an LLM agent read access to the WG21 (ISO C++) committee wiki at wiki.isocpp.org as a verifiable source of truth.

The server authenticates with your credentials, fetches pages over the MediaWiki API, and returns exact wiki text with a clickable URL and revision id. See ARCHITECTURE.md for design detail and SECURITY.md for credential handling.

Access requires WG21 membership. This tool stores nothing confidential in its source and never logs page content.

Install

Install from PyPI (recommended):

pipx install wg21-wiki-mcp
# or: pip install wg21-wiki-mcp==0.3.1

Or run without a manual install via uv:

uvx --from wg21-wiki-mcp==0.3.1 wg21-wiki-mcp

Install from GitHub when you need a specific commit or branch:

pipx install "git+https://github.com/cppalliance/wg21-wiki-mcp.git@v0.3.1"
# development branch:
uvx --refresh --from git+https://github.com/cppalliance/wg21-wiki-mcp.git@develop wg21-wiki-mcp

Or from a local clone (for development):

git clone https://github.com/cppalliance/wg21-wiki-mcp
cd wg21-wiki-mcp
pip install -e ".[dev]"

Requires Python 3.10+. Works on Windows, macOS, and Linux.

Related MCP server: Grounded Code MCP

Configure

The wiki base URL is fixed (https://wiki.isocpp.org); only credentials are needed. Pass them in the MCP host's launch env block. Full host setup, troubleshooting, and env-var reference: docs/RUNBOOK.md.

Minimal Cursor / uvx example:

{
  "mcpServers": {
    "wg21-wiki": {
      "command": "uvx",
      "args": ["--from", "wg21-wiki-mcp==0.3.1", "wg21-wiki-mcp"],
      "env": {
        "WIKI_BOT_USERNAME": "YourAccount@yourbot",
        "WIKI_BOT_PASSWORD": "the-bot-password"
      }
    }
  }
}

See .env.example for optional tuning (cache directory, TTLs, meeting overrides).

Tools

Nine MCP tools expose search, page read, namespace browse, meeting discovery, session bundles, recent changes, and operational status. Signatures and return models: docs/API.md. Agent tool-selection guide: docs/RUNBOOK.md.

Quickstart (programmatic)

from wg21_wiki_mcp.config import Config
from wg21_wiki_mcp.context import ServerContext
from wg21_wiki_mcp import tools

ctx = ServerContext.create(Config.from_env())

hits = tools.search_wiki(ctx, "some topic", limit=5)
page = tools.get_page(ctx, hits.hits[0].title)
print(page.provenance.url, page.provenance.revid)
print(page.content)  # exact wikitext

Error contract

Every tool error surfaces as a structured McpError with a distinct code. Messages contain no credentials or wiki page content. Full code table and invariants: ARCHITECTURE.md#error-contract.

Versioning and stability

The package is 0.x Alpha. Pin a version in your MCP config for reproducible behavior. Stable tool names, parameter shapes, error codes, and provenance fields are documented in STABILITY.md. Release notes: CHANGELOG.md.

Documentation

• docs/API.md — MCP tool reference (generated from source)

• docs/RUNBOOK.md — host setup, troubleshooting, agent guide

• ARCHITECTURE.md — design, data flow, error contract

• STABILITY.md — API stability tiers and deprecation policy

• SECURITY.md — credential handling and confidentiality

• CONTRIBUTING.md — dev setup, tests, governance

License

Boost Software License 1.0 — see LICENSE.