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How to let a coding agent send and read email through MCP tools with Sentio

Connect the sentio-mcp server so an agent can call email actions as native tools.

Authorization notice. Sentio is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.

Credentials. The MCP server needs a Sentio API key, so give the agent a scoped key rather than the admin key.

Who it is forA developer using an AI coding or assistant agent that needs to send status mail or read replies during a task.

The problemAgents have no native way to send or read email, so each mail action needs custom glue code.

The outcomeThe agent sees email actions as native MCP tools and can send or read mail through a running Sentio instance.

What you need first

  • Docker Engine 24+ with the Compose plugin, about 4 GB RAM and 8 GB disk, or a Linux host with PostgreSQL 18+, Redis or Valkey, NATS with JetStream, and S3-compatible storage
  • A terminal and curl
  • Rotation of the bootstrap admin API key before the host is reachable by anyone else

Steps

  1. Run docker compose up -d and confirm curl localhost:8080/health/ready returns ok.
  2. Read the README section 'MCP: give agents email as native tools' to find the sentio-mcp server.
  3. Start the sentio-mcp server from the repo and register it in the agent's MCP configuration. (inferred, check the README)
  4. Ask the agent to list its available email tools and send one test message to <test-address>.

Prompt for your agent

In the truespar/sentio repo, follow the README section 'MCP: give agents email as native tools' to register the sentio-mcp server with this agent. Then send one test email to <test-address> through the Sentio REST API and report the message ID. Verify the message appears in the outbound queue.

Caveat. The README section on the sentio-mcp server was cut off in the source, so the exact server start command must be confirmed in that section before use.

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