signal-mcpl (jeremyschlatter/signal-mcpl) is an MCP server listed on the M8ven Trust Index. M8ven has not graded it: we have no way to read this server ourselves. No publisher has claimed this listing.

Back to MCP Trust Indexm8ven
C
Emerging
74/100
21 days ago

signal-mcpl

MCPL server that bridges Signal via signal-cli, exposing DMs and group chats as channels and providing signal_send and signal_react tools.

→ jeremyschlatter/signal-mcpl· listed on glama

Emerging. No concerning findings. Grades remain capped until the project builds reputation through adoption. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

How we verified

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Who stands behind it

jeremyschlatter

Source: Glama

Is this your MCP?

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Install from

Glama

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// key findings
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
✅
Open source with a license and README
Anyone can audit the code, the license is declared, and the publisher documents what it does.
// environment variables
To run this server yourself, you supply these values. They go in your own MCP client configuration and stay on your machine. The secret label means the value is sensitive, not that the server mishandles it.
configSIGNAL_ACCOUNT(unset) Your own E.164 number; used to detect reactions to your own messages
configSIGNAL_ATTACH_DIR$HOME/.local/share/signal-cli/attachments Where signal-cli writes attachments
configSIGNAL_ATTACH_MAX_BYTES4000000 Max image size bridged as base64
configSIGNAL_CONTACTS_FILE(unset) JSON file persisting the uuid/group -> display-name map
configSIGNAL_DAEMON_URL
configSIGNAL_DEBUG_LOG(unset — off) Append-only JSONL debug log
configSIGNAL_DM_USERS(unset — open) Comma-separated allowlist of UUIDs/numbers. Unset means no filtering.
configSIGNAL_SELF_UUID(unset) Your own account UUID, same purpose
// quality suggestions

Tool annotations

No tools have read-only/destructive annotations

Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.

All four hints declared on every tool

2/2 tools missing one or more hints — signal_send (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); signal_react (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint). OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.

For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.

Tests exist

No test files found

Add tests that exercise each declared tool.

Claim the listing to review these findings one by one and send us a correction where you disagree, straight to the team. Claiming also means we tell you when the grade moves, and reach you first if we find anything urgent.

// full audit trail
The findings above are the summary. The full trail, every check we ran, each deduction, the network hosts observed and the dependency advisories, goes to verified publishers, along with an alert whenever a new one lands. Verified publishers can also review each finding and dispute it in one click. Publisher corrections have sharpened several of our checks this month, because the maintainer knows the codebase better than any scanner.
// improvement guidance — verified publishers only
We have 3 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
[![M8ven Score](https://m8ven.ai/badge/mcp/jeremyschlatter-signal-mcpl-1lrmwp)](https://m8ven.ai/mcp/jeremyschlatter-signal-mcpl-1lrmwp)
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commit: 80e874312e84082adda45566bcfd4b884be58162
code hash: 442cb4c6f1ea807f18f676f45f3f80208f3323b5737a3b9f03fe5d4c80377830
verified: 8/10/2026, 4:11:51 AM
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