ai.peerfoundry/holdkit

up checked 2026-11-11T05:38:28.192Z

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Publisher-provided title

HoldKit

Publisher-provided description

Idempotency keys, locks, timers, and inboxes for agents over MCP. No payments.

Summary by lookupd

Gives agents idempotency keys, leased locks, durable timers, inboxes and a small key-value store for coordinating tool calls.

Install

Claude Code, remote (streamable-http)

claude mcp add --transport http holdkit https://holdkit.peerfoundry.ai/mcp

Codex, remote (streamable-http)

codex mcp add holdkit --url https://holdkit.peerfoundry.ai/mcp

Cursor, remote (streamable-http) → .cursor/mcp.json

{
  "mcpServers": {
    "holdkit": {
      "url": "https://holdkit.peerfoundry.ai/mcp"
    }
  }
}

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Tools (14 tools)

Publisher-provided text

• keys.create Mint a pf_ caller key bound to one HoldKit namespace. The raw key is shown once. Pass this key on every later tools/call. Send it as the caller_key argument.
• inbox.create Create an inbox. Returns webhook and A2A URLs. Call keys.create once. Pass caller_key on every later tools/call.
• inbox.poll Read inbox events after a cursor. Call keys.create once. Pass caller_key on every later tools/call.
• inbox.ack Mark inbox events done. Call keys.create once. Pass caller_key on every later tools/call.
• inbox.wait Poll an inbox. block_ms is accepted and capped at 0 in this MVP, so the call returns current events. Call keys.create once. Pass caller_key on every later tools
• timer.set Schedule a durable timer. Delivery URLs must be public https. Call keys.create once. Pass caller_key on every later tools/call.
• timer.cancel Cancel a timer. Call keys.create once. Pass caller_key on every later tools/call.
• lock.acquire Take a lease lock. Returns a fencing token. Call keys.create once. Pass caller_key on every later tools/call.
• lock.release Release a lock with its fencing token. Call keys.create once. Pass caller_key on every later tools/call.
• idem.begin Start an idempotency key or return the prior outcome. fingerprint is a hex hash. Call keys.create once. Pass caller_key on every later tools/call.
• idem.commit Store the outcome reference for an idempotency key. scope (max 64) and owner are optional. When owner is omitted, the caller key hash is sent. Call keys.create
• kv.get Read a small value. Call keys.create once. Pass caller_key on every later tools/call.
• kv.set Write a small value with a TTL. Emails and card numbers are rejected. Call keys.create once. Pass caller_key on every later tools/call.
• kv.delete Delete a value. Call keys.create once. Pass caller_key on every later tools/call.

Details

• Version: 0.1.0
• Transports: streamable-http
• Uptime (7 days): 100%
• Median latency: 534 ms
• First indexed: 2026-11-01T08:50:41.250Z
• Last seen in registry: 2026-11-01T08:50:41.250Z
• Website: https://peerfoundry.ai/

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