F
licenseNot graded
qualityF
maintenanceAn MCP integration for signal-cli that allows AI agents to send and receive Signal messages, supporting direct messages, group messages, and async message handling.
26
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signal-mcpl
Bridges Signal via a signal-cli daemon, exposing direct messages and group chats as channels, with tools for sending messages and reactions, handling attachments, and sending read receipts.
Click on "Deploy Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type
@followed by the MCP server name and your instructions, e.g., "@signal-mcplSend 'Running late, be there soon' to the family group"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
signal-mcpl
An MCPL server bridging Signal via the
signal-cli daemon (HTTP JSON-RPC + SSE).
Exposes Signal DMs and group chats as MCPL channels, plus signal_send and
signal_react tools.
Conversation | Channel id | Tags |
DM |
|
|
Group |
|
|
Reaction | (either) |
|
The chat:addressed / chat:ambient split is the useful part for a host: DMs
are addressed to the agent and generally warrant waking it; group traffic is
ambient and can be archived for continuity without spending inference on every
message.
Requirements
Node >= 20
A running
signal-clidaemon with the HTTP JSON-RPC + SSE interface enabled
Related MCP server: mcp-signal
Usage
signal-mcpl --stdioConfiguration
All configuration is via environment variables. Nothing is hardcoded.
Variable | Default | Purpose |
|
| signal-cli daemon base URL |
| (unset) | Your own E.164 number; used to detect reactions to your own messages |
| (unset) | Your own account UUID, same purpose |
| (unset — open) | Comma-separated allowlist of UUIDs/numbers. Unset means no filtering. |
| (unset) | JSON file persisting the uuid/group -> display-name map |
|
| Where signal-cli writes attachments |
|
| Max image size bridged as base64 |
| (unset — off) | Append-only JSONL debug log |
Notes
Markdown bold/italic/strikethrough/code is converted to Signal text styles (BodyRange); headers, links and lists pass through as plain text.
Image attachments under
SIGNAL_ATTACH_MAX_BYTESare bridged as base64 image blocks; anything else becomes a text note.Author and group name are embedded in the message text, not just metadata, because hosts commonly render only the text — bare text would otherwise arrive anonymous.
Read receipts are sent for delivered messages.
License
This server cannot be deployed
Maintenance
ActivityMaintained
ResponsivenessNo issues
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- MIT
- FlicenseNot gradedqualityCmaintenanceMCP server for Signal via signal-cli that enables sending and receiving messages, managing contacts and groups, and reacting over stdio.5 npm-