cortex

A knowledge-base tool that stores connected information as pages and links, then helps you explore it through search, graphs, web discovery, and daily digests.

In plain words
What is it for?
Use it to read and search knowledge pages, inspect backlinks and related pages, view a knowledge graph, discover current web content, and add new information.
Why use it?
It reduces the difficulty of finding related notes, seeing gaps in your knowledge, and keeping an AI-maintained collection organized.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/proxy2021/enso/cortex
Any agent
npx skills add Proxy2021/Enso --skill cortex
Clone the repo
git clone --depth 1 https://github.com/Proxy2021/Enso

Made for: Claude Code, Codex.

Per session 28 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 411 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00028 $0.00411
Opus 5 $0.00014 $0.00205
Sonnet 5 $0.00006 $0.00082
Haiku 4.5 $0.00003 $0.00041

Measured yesterday against content hash 00a0b38e4292, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

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 yesterday.

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.

server/skills/cortex/SKILL.md · 60 lines

What it actually says

Cortex

Knowledge Cortex: explore, discover, and grow your AI-maintained knowledge base with graph visualization, web discovery, and daily digest

Available Tools

enso_cortex_explore (primary)

Get Cortex dashboard: page stats by category, recent updates, top entities by connectivity, knowledge gaps, and recent operations log

enso_cortex_read

Read a specific Cortex page with backlinks, outgoing links, related pages, and tags

Parameters:

  • path (string): Page path (e.g. 'entities/react.md')

enso_cortex_search

Search Cortex pages by keyword with optional category and tag filters

Parameters:

  • query (string): Search query
  • category (string): Filter by category: entities, concepts, sources, synthesis
  • tag (string): Filter by tag

enso_cortex_graph

Build knowledge graph with nodes (pages) and edges (wiki links) for visualization

enso_cortex_discover

Search the web for latest content related to a Cortex topic, with AI-suggested branches to explore

Parameters:

  • topic (string): Topic to discover new content for
  • path (string): Optional: wiki page path to read context from

enso_cortex_ingest

Ingest new knowledge into the Cortex from text, URL, or topic

Parameters:

  • text (string): Text content to ingest
  • url (string): Source URL for reference
  • topic (string): Topic label

enso_cortex_digest

Generate an AI summary of the Cortex: strengths, knowledge gaps, and suggested next explorations

enso_cortex_daily_discovery

Daily scheduled task: search web for latest developments on top Cortex topics, ingest findings, and email a curated digest

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.

  1. yesterday First seen · 60 lines · 28 tokens per session scan A 00a0b38e4292

Subscribe to this mod's changes

cortex is a skill published in the GitHub repository Proxy2021/Enso (5 stars, last pushed 3mo ago), licensed MIT. It adds 28 tokens to every session and 411 once invoked, about $0.0001 per session on Opus 5. 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 2026-08-31.

Related

Other skills, from other repositories