wcpd — Workstation Capability Protocol (reference server)

wcpd is the reference implementation of the Workstation Capability Protocol (WCP) — an open, vendor-neutral standard that lets an AI agent discover, understand, and operate a whole workstation under governed, audited, revocable authority.

It exposes 35 capability families / 258 operations — accessibility tree, windows, screen, files, processes, packages, services, containers, VMs, Kubernetes, git, networking, a browser (Chrome DevTools), and an RDF/PROV-O knowledge-graph view of the machine — behind least-privilege scopes, sandbox confinement, and a hash-chained tamper-evident audit log. It speaks the Model Context Protocol, so any MCP client (Claude Desktop, Claude Code, …) can use it today.

Install

pip install wcp
pip install "wcp[graph]"     # + live SPARQL (rdflib) for wcp.graph.export

Extras: graph (rdflib for live SPARQL), linux-ax (PyGObject for the Linux AT-SPI2 accessibility backend), windows-ax (comtypes for the Windows UI Automation backend).

Run

wcpd stdio     # local single-user MCP over stdio (OS session = trust boundary)
wcpd serve     # HTTP/MCP binding (workstation-addressed JWT) for networked use
wcpd doctor    # probe which capability tiers this host supports

Restricted scopes are off by default and opt-in per flag: --allow-input --allow-osa --allow-browser-eval --allow-scheduler --allow-secrets.

Security

Every operation carries exactly one scope (wcp:<family>:<class>); five restricted scopes (input:synthesize, osa:run, browser:evaluate, scheduler:control, security:secrets) are never granted by wildcard and are opt-in per flag. Filesystem-touching families are sandbox-confined; every invocation (including denials) is appended to a SHA-256 hash-chained audit log that wcp.security.audit_verify can re-check for tampering. WCP never bypasses SIP/TCC/sudo — where a capability isn't available it returns WCP_BACKEND_UNAVAILABLE rather than faking a result.

Connect to Claude Desktop

Install into a venv outside macOS TCC-protected folders, add a wcp entry to ~/Library/Application Support/Claude/claude_desktop_config.json, restart Claude Desktop, and grant Accessibility + Screen Recording. Full guide, complete capability catalog, and the normative spec: https://github.com/kchemorion/WorkstationCapabilityProtocol

License

Apache-2.0. See LICENSE.