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.
npx agentmods add skills/cdeust/cortex/cortex-navigate-knowledgenpx skills add cdeust/Cortex --skill cortex-navigate-knowledgegit clone --depth 1 https://github.com/cdeust/CortexWhat 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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00095 | $0.00780 |
| Opus 5 | $0.00048 | $0.00390 |
| Sonnet 5 | $0.00019 | $0.00156 |
| Haiku 4.5 | $0.00010 | $0.00078 |
Grade A, and why
cortex-navigate-knowledge 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.
How it starts
The opening of the file, as written. The whole thing — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Navigate Knowledge — Graph Exploration and Causal Chains
Keywords
knowledge graph, relationships, connections, causal chain, how are these related, what connects, drill down, explore, navigate, entity graph, trace, cause and effect, related to, linked to, co-access, cluster
Overview
Cortex maintains a knowledge graph of entities (people, technologies, concepts, files) and their relationships extracted from memories. This skill lets you traverse that graph — follow causal chains, explore co-access patterns, drill into fractal memory clusters, and understand how different pieces of knowledge connect.
Use this skill when: You need to understand relationships between concepts, trace cause-and-effect chains, or explore a topic area systematically.
Workflow
Step 1: Trace Causal Chains
Follow entity relationships through the knowledge graph:
cortex:get_causal_chain({
"entity": "PostgreSQL",
"direction": "both",
"max_depth": 3
})
Returns a chain of entities connected by typed relationships (causes, uses, depends_on, related_to, etc.). Direction can be "forward" (effects), "backward" (causes), or "both".
Step 2: Navigate Co-Access Paths
Find memories frequently accessed together using Successor Representation:
cortex:navigate_memory({
"memory_id": <starting_memory_id>,
"depth": 2,
"max_nodes": 20
})
Returns a graph of memories connected by co-access frequency — revealing implicit relationships that aren't in the explicit knowledge graph.
Step 3: Hierarchical Exploration
Browse memories through fractal clusters (L0 = broad, L1 = mid, L2 = specific):
cortex:recall_hierarchical({
"query": "authentication system",
"levels": 3
})
Then drill into any interesting cluster:
cortex:drill_down({
"cluster_id": "<cluster from hierarchical recall>",
"level": "L1"
})
Step 4: Detect Structural Gaps
Find disconnected or under-connected areas:
cortex:detect_gaps({
"domain": "<optional>"
})
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.
- yesterday First seen · 102 lines · 95 tokens per session scan A 5b78d8c62153
cortex-navigate-knowledge is a skill published in the GitHub repository cdeust/Cortex (71 stars, last pushed 3d ago), licensed MIT. It adds 95 tokens to every session and 780 once invoked, about $0.0005 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 2026-08-30.
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