quartermaster-mcp

A drop-in, offline MCP proxy that federates N downstream MCP servers behind a small set of meta-tools. The client loads three tools instead of every downstream schema.

| Meta-tool | Federated (servers) | Static (tools) | |---|---|---| | retrieve_tools | ranked shortlist + schemas + confidence | ranked shortlist + confidence | | call_tool | forwards to the right downstream | not available (discovery only) | | list_servers | connected servers + tool counts | not available |

Self-contained: the BM25/TF-IDF ranker, telemetry helpers, reporting CLI, eval runner, inspector, and dashboard are bundled into this one npm package. The only runtime dependency is the MCP SDK — no embedding model, no network, no API key.

npx quartermaster-mcp --config ./quartermaster.json

Idea

client ──► quartermaster-mcp ──► github-mcp
                  │         └──► jira-mcp
                  │         └──► slack-mcp
                  ▼
     retrieve_tools / call_tool / list_servers  (federated)
     retrieve_tools only                        (static manifest)

On a query, retrieve_tools returns the top-K relevant tools (offline BM25, no model). The host LLM picks one and invokes it through call_tool (federated mode).

Config

Federated (recommended)

Spawn live downstream servers. ${VAR} is resolved from the environment at launch; an unset var fails fast:

{
  "servers": [
    {
      "id": "github",
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-github"],
      "env": { "GITHUB_PERSONAL_ACCESS_TOKEN": "${GITHUB_TOKEN}" }
    }
  ],
  "synonyms": { "bug": ["issue"] },
  "k": 8
}

Optional ranker tuning (ranker block):

{
  "ranker": {
    "ranker": "bm25",
    "expansionWeight": 0.5,
    "marginThreshold": 0.15,
    "hintBoost": 0.1
  }
}

Federated deployments can re-poll downstream manifests:

{ "refreshIntervalMs": 300000 }

Exposes retrieve_tools, call_tool, and list_servers.

Static (discovery only)

A fixed tool manifest — useful for demos and ranking experiments. No call_tool (nothing to forward to):

{
  "tools": [
    { "name": "github.create_issue", "description": "Open a new issue in a repository" },
    { "name": "slack.post_message", "description": "Send a message to a Slack channel" }
  ],
  "synonyms": { "bug": ["issue"] },
  "k": 8
}

See examples/static-demo for a runnable static example.

Run

npx quartermaster-mcp --config ./quartermaster.json

The same package also installs the quartermaster product CLI:

npx -p quartermaster-mcp quartermaster report --audit audit.jsonl --out report.html
npx -p quartermaster-mcp quartermaster inspect --config quartermaster.json --audit audit.jsonl
npx -p quartermaster-mcp quartermaster eval --config quartermaster.json --cases eval.jsonl
npx -p quartermaster-mcp quartermaster dashboard --audit audit.jsonl

From a source checkout (after pnpm -r build):

node packages/proxy/bin/quartermaster-mcp.js --config ./quartermaster.json
node packages/proxy/bin/quartermaster.js report --audit audit.jsonl

Security

See SECURITY.md for the trust model and vulnerability reporting.