A local-first memory service that stores and retrieves information in a local database. It also organizes memories as a knowledge graph and can build a browsable wiki; automatic capture through hooks is limited to Claude Code, while Gemini CLI requires manual use.

It helps agents remember and recall project information, connect related knowledge, and maintain a local knowledge base. It requires uv or uvx to be available.

It lets an agent retain information between sessions without relying on a remote memory store, while making related facts easier to find.

cortex — Plugin for Gemini CLI by cdeust

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/cdeust/Cortex

Made for: Gemini CLI.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/plugins/cdeust/cortex/gemini-extension/github.svg)](https://agentmods.dev/plugins/cdeust/cortex/gemini-extension)

Your own site

<a href="https://agentmods.dev/plugins/cdeust/cortex/gemini-extension"><img src="https://agentmods.dev/badge/plugins/cdeust/cortex/gemini-extension/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/plugins/cdeust/cortex/gemini-extension"><img src="https://agentmods.dev/badge/plugins/cdeust/cortex/gemini-extension.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

cortex scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 29d ago.

The scan reads gemini-extension.json. This mod also ships 51 executable files (scripts/aggregate_hook_timings.py, scripts/backfill_wiki_titles_2026_07_14.py, scripts/backfill_write_class.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

gemini-extension.json · 12 lines

What it actually says

{
  "name": "cortex",
  "version": "4.23.5",
  "description": "Persistent local-first memory MCP server: remember/recall with thermodynamic heat and decay, knowledge graph, autonomous wiki, local SQLite store by default. Requires uv (uvx) on PATH; hooks-based auto-capture is Claude Code-only — on Gemini CLI memory is manual-tool-driven.",
  "mcpServers": {
    "cortex": {
      "command": "uvx",
      "args": ["--from", "hypermnesia-mcp[sqlite]", "hypermnesia-mcp"]
    }
  }
}

Files

What ships with it

60 files beside gemini-extension.json in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

29d ago Changed c546128b8108
1mo ago Changed 64958270dc2d
1mo ago Changed 773dfdd1c9ce
1mo ago Changed ec1d46b52fb6
1mo ago Changed 385c4f269bdd
1mo ago Changed 3ae3974a2f71
1mo ago First seen · 12 lines scan A 25851dd9079b

Subscribe to this mod's changes

cortex is a plugin published in the GitHub repository cdeust/Cortex (75 stars, last pushed yesterday), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-06.

Building agents Claude Code Memory and context agent-memory-system causal-inference cognitive-architecture mcp-server model-context-protocol

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cortex

Getting it into your agent

Wrote this? Show the measurements

Grade A, and why

Nothing flagged

What it actually says

What ships with it

What this file has done since we first saw it

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