postcept/mcp

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MCP server for Postcept. An agent calls it to verify a refund, cancellation, or ticket resolution against the system of record and get back a signed receipt.

Обзор

A Model Context Protocol server that exposes as MCP tools. After an agent performs a high-risk action (a refund, a subscription cancellation, a support-ticket resolution), it calls a verify_* tool to confirm the action actually completed in the system of record (Stripe, Zendesk, and more) and obtain a signed completion receipt. "done" becomes proof, not a claim. The server is a thin wrapper over the live Postcept HTTP API. It holds no credentials of its own beyond your Postcept API key, and verification is read-only against your systems of record. Create an API key in the Postcept dashboard under . Every verify_* tool accepts test: true to run against the deterministic sandbox connector (excluded from your Verified Completion Rate), so an agent can exercise the full flow without a live system of record. A non-verified result (incomplete, duplicated, mismatched, policy_failed) means the work is done. Surface the gap and recover.

README

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@postcept/mcp

A Model Context Protocol server that exposes Postcept, outcome verification for AI agents, as MCP tools.

After an agent performs a high-risk action (a refund, a subscription cancellation, a support-ticket resolution), it calls a verify_* tool to confirm the action actually completed in the system of record (Stripe, Zendesk, and more) and obtain a signed completion receipt. "done" becomes proof, not a claim.

The server is a thin wrapper over the live Postcept HTTP API. It holds no credentials of its own beyond your Postcept API key, and verification is read-only against your systems of record.

Configuration

Variable	Required	Default	Notes
`POSTCEPT_API_KEY`	yes	none	A Postcept API key (`pcpt_sk_...`) with `verifications:write`.
`POSTCEPT_BASE_URL`	no	`https://api.postcept.com`	Point at a self-hosted or staging API.

Create an API key in the Postcept dashboard under API keys.

Use with Claude Desktop / Claude Code

{
  "mcpServers": {
    "postcept": {
      "command": "npx",
      "args": ["-y", "@postcept/mcp"],
      "env": { "POSTCEPT_API_KEY": "pcpt_sk_..." }
    }
  }
}

Tools

Tool	Purpose
`verify_refund`	Verify a claimed refund (exists, amount/currency/customer match, not duplicated).
`verify_cancellation`	Verify a subscription was actually cancelled.
`verify_ticket`	Verify a support ticket is in the expected state.
`get_verification`	Fetch a past verification and its signed receipt by id.
`reconcile_verification`	Re-verify a past verification against the live system of record.
`verified_completion_rate`	Read the organization’s Verified Completion Rate.

Every verify_* tool accepts test: true to run against the deterministic sandbox connector (excluded from your Verified Completion Rate), so an agent can exercise the full flow without a live system of record.

A non-verified result (incomplete, duplicated, mismatched, policy_failed) means the work is not done. Surface the gap and recover.

Advisory, by design

MCP puts the verification call in the agent’s hands, which makes it the right integration for development, demos, and workflows where the agent’s judgment is

Открыть полный README на GitHub

Установка

npx -y @postcept/mcp

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Конфигурация

{
  "mcpServers": {
    "postcept": {
      "command": "npx",
      "args": ["-y", "@postcept/mcp"],
      "env": { "POSTCEPT_API_KEY": "pcpt_sk_..." }
    }
  }
}