MCP Servers

willow-mcp

An agent-neutral MCP server providing SQLite key/value storage, Postgres knowledge base, and Kart task queue functionality. Features SAP/1.0 authorization on every tool call for secure multi-application access.

Category

README

willow-mcp

Agent-neutral MCP server. SQLite key/value store, Postgres knowledge base, Kart task queue. SAP/1.0 authorization on every tool call.

pip install willow-mcp

Tools

Tool	Description
`store_put`	Write to SQLite store
`store_get`	Read from SQLite store
`store_list`	List atoms in a collection
`store_search`	Full-text search in a collection
`store_delete`	Delete an atom
`store_search_all`	Search across all collections
`knowledge_ingest`	Add to Postgres knowledge base
`knowledge_search`	Search Postgres knowledge base
`task_submit`	Submit task to Kart queue
`task_status`	Check task status
`task_list`	List pending tasks

Every tool requires an app_id param. Authorization is checked via SAP/1.0.

OpenClaw config

{
  "mcp": {
    "servers": {
      "willow": {
        "command": "python3",
        "args": ["-m", "willow_mcp"],
        "env": {
          "WILLOW_PG_DB": "willow",
          "SAP_SAFE_ROOT": "~/.sap/Applications",
          "SAP_PGP_FINGERPRINT": "YOUR_KEY_FINGERPRINT"
        }
      }
    }
  }
}

Configuration

Env var	Default	Description
`WILLOW_PG_DB`	`willow`	Postgres database name
`WILLOW_PG_USER`	`$USER`	Postgres user (Unix socket auth)
`WILLOW_STORE_ROOT`	`~/.willow/store`	SQLite store directory
`SAP_SAFE_ROOT`	`~/.sap/Applications`	SAFE folder root
`SAP_PGP_FINGERPRINT`	(empty)	Pinned GPG fingerprint

Authorization

Uses openclaw-sap-gate (SAP/1.0). Set up a SAFE folder for each app_id:

sap-gate init my-app
# edit ~/.sap/Applications/my-app/safe-app-manifest.json
# sign it, then:
sap-gate verify my-app

License

MIT — Sean Campbell 2026

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