Hippocampus (karrolcia/hippocampus) 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
Caution
74/100
1 month ago

Hippocampus

Open-source MCP memory server providing persistent, cross-platform context for AI tools via a knowledge graph with encrypted storage.

→ karrolcia/hippocampus· listed on glama

Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

How we verified

Code Verified⚡ Live Monitored: not connected

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Who stands behind it

karrolcia

Source: Glama

Is this your MCP?

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Install from

Glama

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// key findings
⚠️
Tests do not pass
Either the test suite is broken or the code regressed. Either way the published behaviour can’t be verified by the publisher’s own tests.
✅
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: HIPPO_AGENT_TOKEN, HIPPO_TOKEN
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.
🔐 secretHIPPO_AGENT_TOKEN
configHIPPO_CONTEXT_MAX_OBSERVATIONSNo 100 Max observations in hippocampus://context resource
configHIPPO_DB_PATHNo ./data/hippocampus.db Database file location
configHIPPO_ENDPOINT
configHIPPO_KEYCHAIN_ACCOUNT
configHIPPO_KEYCHAIN_SERVICE
configHIPPO_OAUTH_ISSUERfly secrets set =https://<your-app>.fly.dev
configHIPPO_OAUTH_PASSWORD_HASHoutput of the hash command above>
configHIPPO_OAUTH_USERfly secrets set =admin
configHIPPO_PASSPHRASEany-secret-phrase-you-want
🔐 secretHIPPO_TOKENNo — Bearer token for local dev (skip OAuth)
configHOSTNo 0.0.0.0 Bind address
configRATE_LIMIT_RECALLNo 60 Read rate limit per minute
configRATE_LIMIT_REMEMBERNo 20 Write rate limit per minute
configTRANSFORMERS_CACHENo System default Embedding model cache directory
Deployment configuration, supplied by whoever hosts the server. Users are not asked for these.
deployPORT
// 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

11/11 tools missing one or more hints — remember (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); recall (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); forget (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +8 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 inputs are validated

Only 0/11 tool handlers declare input schemas (0%)

Declare an inputSchema with zod/joi/yup on every tool definition.

Tests pass

npm test failed — tests do not pass

Make sure npm test runs cleanly. Common cause: missing build step or missing env vars.

Shell command execution

7 child_process calls — runs shell commands

Prefer library functions over shell-outs. If you must shell out, ensure all inputs are properly escaped.

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 5 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 Verified](https://m8ven.ai/badge/mcp/karrolcia-hippocampus-gmebo2?variant=verified)](https://m8ven.ai/mcp/karrolcia-hippocampus-gmebo2)
Shows verification status without the grade. Want the grade badge instead? Remove ?variant=verified from the URL.
commit: 1cefb50b5cafed929c58d09ac86bd6f7810d5669
code hash: 1919f0dfd0de830c252084293dabd191ef9769829d8948482ac39d61c4d9a846
verified: 7/19/2026, 8:58:45 AM
view raw JSON →
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