build-knowledge-graph

build-knowledge-graph is a skill for Claude Code, Codex from e7nd7r/gnapsis. It costs 42 tokens per session (2,556 once invoked), scanned A, original, MIT.

A codebase-mapping tool that reverse engineers an application and records its domains, features, modules, components, and relationships as a knowledge graph.

In plain words
What is it for?
Use it to map an entire repository or a selected folder, document architectural decisions, and trace relationships between code and other project files.
Why use it?
It helps you understand an unfamiliar codebase and see how its parts connect instead of relying only on scattered files.

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/e7nd7r/gnapsis/build-knowledge-graph
Any agent
npx skills add e7nd7r/gnapsis --skill build-knowledge-graph
Clone the repo
git clone --depth 1 https://github.com/e7nd7r/gnapsis

Made for: Claude Code, Codex.

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.

agentmods badge for build-knowledge-graph

README.md
[![agentmods](https://agentmods.dev/badge/skills/e7nd7r/gnapsis/build-knowledge-graph.svg)](https://agentmods.dev/skills/e7nd7r/gnapsis/build-knowledge-graph)
Your own site
<a href="https://agentmods.dev/skills/e7nd7r/gnapsis/build-knowledge-graph"><img src="https://agentmods.dev/badge/skills/e7nd7r/gnapsis/build-knowledge-graph.svg" alt="Measured on agentmods" height="20"></a>
Per session 42 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,556 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 $0.00042 $0.02556
Opus 5 $0.00021 $0.01278
Sonnet 5 $0.00008 $0.00511
Haiku 4.5 $0.00004 $0.00256

Measured 3d ago against content hash 6c36058aaddb, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

build-knowledge-graph 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 3d ago.

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.

.claude/skills/build-knowledge-graph/SKILL.md · 234 lines

How it starts

The opening of the file, as written. The whole thing — 234 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Build Knowledge Graph

Reverse engineer the architecture of the codebase and build a comprehensive knowledge graph using the gnapsis MCP tools, following a strict derivation order methodology.

If an argument is provided, focus the analysis on that scope or path. Otherwise, analyze the entire codebase.


CRITICAL RULES

  1. Always use gnapsis MCP tools to register all nodes and relationships in the knowledge graph. The gnapsis graph is the primary output.
  2. Proceed through phases, summarize at each phase boundary. Complete each phase fully, then summarize what was done before moving to the next.
  3. Use best judgment for ambiguity: When you encounter ambiguity about business domains, feature boundaries, or architectural decisions, use your best technical judgment and document your reasoning. Add a note in the entity description when a decision was ambiguous.
  4. ALWAYS run analyze_document before creating entities for a source file. This gives you the exact LSP symbol names. Never guess symbol names.
  5. Use ref_type: "code" with lsp_symbol for source files. Only use ref_type: "text" for markdown, docs, and config files.
  6. Be exhaustive, not superficial. Scan every directory, every configuration file, every module entry point. Leave no stone unturned.

GNAPSIS TOOL REFERENCE

Initialization & Discovery

  • init_project — Initialize the database schema (run once at start)
  • project_overview — Get current ontology: taxonomy (categories by scope), entity hierarchy, statistics

Entity Lifecycle

  • create_entity(name, description, category_ids, parent_ids, commands) — Create an entity with at least one reference
  • update_entity(entity_id, ...) — Update entity, add/remove references, create relationships
  • delete_entity(entity_id) — Delete entity (must have no children)

Taxonomy

  • create_category(name, scope) — Create a new category at a scope (if the defaults don't fit)

Querying

  • get_entity(entity_id) — Full entity details with references and relationships
  • find_entities(scope, category, parent_id) — Filter entities by scope/category/parent
  • search(query) — Semantic search across entities and references
  • query(entity_id, semantic_query) — Extract relevant subgraph within token budget
  • get_document_entities(document_path) — Get all entities referenced in a file

Read the full file on GitHub · 234 lines

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. 3d ago First seen · 234 lines · 42 tokens per session scan A 6c36058aaddb

Subscribe to this mod's changes

build-knowledge-graph is a skill published in the GitHub repository e7nd7r/gnapsis (5 stars, last pushed 7mo ago), licensed MIT. It adds 42 tokens to every session and 2,556 once invoked, about $0.0002 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.

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