Agent skill

ln-020-codegraph

Builds and queries code knowledge graph for dependency analysis, references, implementations, and architecture overview. Use when starting work on unfamiliar codebase or before refactoring.

View SKILL.md on GitHub Repository
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Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/ln-020-codegraph-levnikolaevich-claude-code-skills

SKILL.md

Paths: File paths are relative to skills repo root.

Code Knowledge Graph

Type: Standalone Utility Category: 0XX Dev Environment

Indexes codebase into a layered graph (tree-sitter AST → SQLite) and provides dependency analysis, path tracing, references, implementations, and architecture overview via MCP tools.

Inputs

Input Required Source Description
project_path yes args or CWD Project root to index
command no args Specific action: index, search, symbol, paths, refs, arch

When to Use

  • Starting work on an unfamiliar codebase → index + architecture
  • Before refactoring a function/class → search + get_symbol + trace_paths
  • Understanding call flow → trace_paths
  • Finding a symbol quickly → search

Workflow

Phase 1: Index

Check if graph exists (.codegraph/index.db in project root).

If NOT exists:

Call: index_project({ path: "{project_path}" })

If exists (re-index on demand):

Call: index_project({ path: "{project_path}" })

Idempotent — skips unchanged files automatically.

Phase 2: Query

Route based on user intent:

User says Tool Parameters
"Show dependencies" / "What uses X?" trace_paths { name: "X", file: "...", path_kind: "mixed", direction: "reverse" }
"Who calls X?" / "What does X call?" trace_paths { name: "X", file: "...", path_kind: "calls", direction: "reverse"|"forward" }
"Tell me about X" / "Context of X" get_symbol { name: "X", file: "..." }
"Project structure" / "Architecture" get_architecture { path?: "src/" }
"Find symbol X" search_symbols { query: "X" }
"Watch for changes" watch_project { path: "{project_path}" }
"Find duplicate code" find_clones { type: "all" }
"Risky hotspots" find_hotspots { minCallers: 2, minComplexity: 5 }
"Unused exports" find_unused_exports {}
"Circular dependencies" find_cycles {}
"Module coupling" get_module_metrics { minCoupling: 0 }
"Implementations / overrides" find_implementations { qualified_name: "..." }
"Dataflow / propagation" find_dataflows { qualified_name: "...", depth: 2 }

Phase 3: Present Results

  1. Show MCP tool output directly (markdown tables)
  2. For code snippets referenced in results, use hex-line read_file with line ranges
  3. Suggest follow-up queries based on results:
    • After search_symbols → suggest get_symbol for top result
    • After get_symbol → suggest trace_paths if refactoring
    • After trace_paths → suggest find_references or find_implementations depending on symbol kind

Supported Languages

Language Extensions Coverage
JavaScript .js, .mjs, .cjs, .jsx Strongest semantic coverage
TypeScript / TSX .ts, .tsx Strongest semantic coverage
Python .py Definitions, exports, imports; more limited cross-file semantics
C# .cs Definitions, exports, imports, type relations
PHP .php Definitions, exports, imports

MCP Server Setup

Add to .mcp.json:

json
{
  "mcpServers": {
    "hex-graph": {
      "command": "node",
      "args": ["{skills_repo}/mcp/hex-graph-mcp/server.mjs"]
    }
  }
}

Definition of Done

  • Project indexed (index_project returns success)
  • Query results shown to user
  • Follow-up suggestions provided

Version: 0.1.0 Last Updated: 2026-03-20

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