pebble-index-mcp (jcrabapple/pebble-index-mcp) is an MCP server listed on the M8ven Trust Index. It scores 74 out of 100, grade C. It declares 4 tools. No publisher has claimed this listing.

Back to MCP Trust IndexM8ven
C
Emerging
74/100
9 days ago

pebble-index-mcp

Enables voice captures from a smart ring to search and append notes in a local Obsidian vault and query an OpenAI-compatible AI agent, returning answers as phone notifications.

→ jcrabapple/pebble-index-mcp· 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

jcrabapple

Source: Glama

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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.
🔐
You'll be asked for 2 credentials: MCP_BEARER_TOKEN, HERMES_API_KEY
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// 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.
configVAULT_PATHRequired. Vault root for the file tools
🔐 secretMCP_BEARER_TOKENAuth: static bearer token (), constant-time compared, required on every request. An empty token fails closed (all requests 401) and logs a warning at startup.
configHERMES_API_URLask_hermes target
🔐 secretHERMES_API_KEYAPI server bearer key
configRING_MODELModel alias sent upstream (map it to a cheap model via the API server's model_routes)
configMCP_ALLOWED_HOSTSanything listed in .
configRING_PERSONA_FILEOptional path to a text file replacing the generic cloud-agent persona
configMCP_HOSTListen address
configMCP_PORTListen address
// 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

4/4 tools missing one or more hints — vault_search (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); vault_read (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); vault_append (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +1 more. 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.

Tool test coverage

Only 1/4 tools referenced in tests (25%)

Write tests that reference each tool by name so every tool has at least one test.

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/jcrabapple/pebble-index-mcp)](https://m8ven.ai/mcp/jcrabapple/pebble-index-mcp)
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commit: 99a0ef3918b67093eb2fe597e1e1c116d4e89675
code hash: beab00d39e070b82a8d8563b753d1e049398163f40d8d558b864f3c4b409ee4c
verified: 9/1/2026, 5:06:22 PM
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