KARTA — spend control for AI agents

Reliability

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How to connect

Add it to any MCP client that supports remote servers.

{
  "mcpServers": {
    "karta-spend-control-for-ai-agents": {
      "type": "http",
      "url": "https://karta.rta.lat/mcp"
    }
  }
}

6 tools

• check_spend

  Check whether a proposed agent spend is inside a task envelope. Returns verdict, rule, reason, counterfactual and next. No state is stored.

• open_envelope

  Create a signed budget envelope for one task: total budget, per-call cap, call count, allowlisted payees, subscription rule, expiry. Stores it in this server's local ledger (no funds move, no keys). Returns the envelope id. Capped at 30 envelopes/hour per server.

• get_envelope

  Return an envelope's state: budget, per-call cap, calls used, spent, remaining, allowlist and expiry. Read-only.

• kill_envelope

  Stop one task envelope immediately: no further spend is approved for it, the reason is recorded with a timestamp. Idempotent — the first reason wins.

• envelope_evidence

  Return an evidence bundle for one envelope: state, every recorded spend, the stop record and a sha256 of the whole pack that anyone can recompute. Read-only.

• policy_rules

  List the deterministic rules a spend is checked against (E01-E08) with the order they are applied and the meaning of each. Read-only, no state.

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