# @markmnl/fmsg-mcp

MCP server for fmsg: send and receive federated messages from any AI agent via a deployed fmsg Web API

- **Type:** MCP server
- **Trust:** 85/100 (A), scored on the package rubric
- **Verification:** verified (build provenance)
- **Version:** 0.1.3
- **Author:** Mark Mennell
- **License:** MIT
- **npm:** @markmnl/fmsg-mcp
- **Source:** https://github.com/markmnl/fmsg-mcp
- **Compatible clients:** claude-code, cursor, copilot, gemini (basis: transport)

## Trust

85/100 (A), scored on the package rubric
- Publisher verified: no
- Build provenance: verified attestation
- npm trusted publishing (OIDC): yes
- Install scripts: nothing suspicious found
- Prompt-injection scan: not run
- Obfuscation scan: not run
- Evidence age: 0 days

## Security scan

- **Status:** clean
- **Scanned:** 2026-09-06T14:08:38.435Z
- **Version scanned:** 0.1.3
- **CVEs:** none found by OSV at scan time

## Tools

14 declared. Statically extracted from the shipped source — a floor on the surface, not a census.
- `whoami` — Report the fmsg address this server acts as (derived from the API key), the fmsg Web API URL,
- `resolve_address` — Resolve a short name to a full fmsg address without sending anything: a literal @user@domain is returned
- `list_messages` — List messages received by this address, newest first. Each item carries the id, sender, recipients, topic,
- `list_sent` — List messages sent by this address (including unsent drafts, shown with time null), newest first, with
- `get_message` — Fetch one message with its full body (for text-like types), headers, recipients, added recipients,
- `get_thread` — Reconstruct the conversation a message belongs to: the direct lineage from the thread root down to the given
- `delivery_status` — Per-recipient delivery state for a message this address sent: delivered time and the receiving host's
- `mark_read` — Mark received messages as read. Reading a message with get_message does not mark it read.
- `download_attachment` — Download one attachment of a message. Up to max_inline_bytes the bytes are returned inline as an embedded
- `send_message`
- `reply`
- `add_recipients` — Add recipients to a message that was already sent (one you sent or received as a primary recipient).
- `react` — Set or clear your emoji reaction on a message (one reaction per person; a new emoji replaces the previous).
- `wait_for_message` — Block until the next inbound message arrives (pushed over the fmsg host's WebSocket) and return it with its

## Install

**Verdict: install** — No blocking findings and no open coverage gaps — safe to install as configured.
**Config** (claude-code):
```json
"{\n  \"mcpServers\": {\n    \"fmsg\": {\n      \"command\": \"npx\",\n      \"args\": [\n        \"-y\",\n        \"@markmnl/fmsg-mcp\"\n      ],\n      \"env\": {\n        \"FMSG_API_KEY\": \"<YOUR_FMSG_API_KEY>\"\n      }\n    }\n  }\n}"
```
**Credentials it will ask for** (names only — Forge never holds a value):
- `FMSG_API_KEY` — Fmsg API Key (required)
Placeholders only. Forge never holds, brokers, or transmits a credential value — replace each <YOUR_NAME> in your own config file. Do not send a value back to Forge; no Forge endpoint accepts one.
- This entry needs 1 credential (1 required). The generated config carries placeholders, so it will fail in the editor rather than at runtime if they are left unset.

## Blast radius

Moderate blast radius — holds an api key; runs on your machine.
- Floor 22, ceiling 22 (tier: moderate)
- This is impact, not likelihood. A high radius is not a defect: a filesystem server is supposed to write files. It is never part of the trust score.

## Machine-readable views of this entry

- Signed JSON: https://forgeregistry.com/api/v1/packages/%40markmnl%2Ffmsg-mcp
- Install plan: https://forgeregistry.com/api/v1/packages/%40markmnl%2Ffmsg-mcp/install-plan
- Alternatives: https://forgeregistry.com/api/v1/alternatives/%40markmnl%2Ffmsg-mcp
- HTML page: https://forgeregistry.com/registry/%40markmnl%2Ffmsg-mcp
- MCP: POST https://forgeregistry.com/api/mcp → `forge_get_package` / `forge_install_plan`

## About this document

Generated by Forge (https://forgeregistry.com) — a compact rendering of the same record served, signed, at the JSON URL above. Trust and scan facts are the registry's own measurements; anything Forge did not measure is named as unmeasured rather than omitted.