Pursers
Coordinate AI-agent work on a local-first, owner-controlled MCP board
The current version, v5.0.0, was published to the official MCP registry on 2026-09-18. It is distributed as pursers-central on PyPI, filed under Other by this index, and declares 18 environment variables. Removals and unreachable sources are measured across every server this index tracks, contract drift across the servers that answer in consecutive snapshots; the index's current counts put this record in context.
Using Pursers in Claude, Cursor, Gemini CLI, Cline, or Zed?
MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).
Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less
uv tool install mcpindex-gate && mcpindex-config-wireVerdict not yet evaluated for this tool. The semantic screen takes adversarial cases first; coverage rolls out as the corpus expands (15/150 labels to graduation). The deterministic conformance probe is built but has not yet run on the public corpus, so a recorded verdict here is REVIEW or UNVERIFIED, never a clearing ALLOW. Until a verdict is recorded, an agent should treat this tool as not-yet-cleared and fall back to its own checks. Method: the eval, four-state verdict, honest limits.
Own this server? Screen its description →
That verdict was true at screening time (snapshot 2026-09-19).
Contracts can change after screening, with no version bump. The gate pins Pursers’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday.
See your first HOLD in 2 minutes →
Related: how to trust an MCP server · screen before install · silent contract drift
ONBOARD_CENTRAL_HOSTLoopback bind host used by the packaged runtime
ONBOARD_CENTRAL_PORTLoopback bind port used by the packaged runtime
ONBOARD_CENTRAL_DATA_DIRPrivate Central data directory; --data-dir/--data-root is the equivalent CLI input
ONBOARD_CENTRAL_LOG_LEVELPackaged runtime log level
ONBOARD_CENTRAL_ALLOWED_HOSTSOptional comma-separated bare Host names accepted in addition to the bind host
ONBOARD_CENTRAL_TLS_CERTFILEOptional TLS certificate path; requires ONBOARD_CENTRAL_TLS_KEYFILE
ONBOARD_CENTRAL_TLS_KEYFILEOptional TLS private-key path; requires ONBOARD_CENTRAL_TLS_CERTFILE
CENTRAL_ADMISSIONCentral admission policy; Pursers supports invite-only admission
CENTRAL_AUTH_MODECentral authentication mode; Pursers supports JWT authentication
CENTRAL_JWKS_PATHPath to the issuer public JWKS used to verify seat credentials
CENTRAL_JWT_AUDIENCEMCP resource URL in audience and resource claims; defaults to the loopback bind URL
CENTRAL_JWT_CLOCK_SKEWAllowed JWT clock skew in seconds
CENTRAL_JWT_ISSUERExact issuer URL in every accepted seat credential
CENTRAL_PRINCIPAL_STREAM_CAPMaximum concurrent event streams accepted per principal
CENTRAL_REAPER_INTERVAL_SInterval in seconds between expired-lease reaper sweeps
CENTRAL_REQUEST_STATE_KEY_FILEOptional restart-safe request-state keyring path
PURSERS_LEGACY_TOOLSString flag: use 1 to expose deprecated coordination tools; use 0 to keep them hidden
STORE_BACKENDCentral storage backend; Pursers supports SQLite
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