508 lines
24 KiB
Markdown
508 lines
24 KiB
Markdown
<div align="center">
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# CodeGraph
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### Supercharge Claude Code, Cursor, Codex, and OpenCode with Semantic Code Intelligence
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**~35% cheaper · ~70% fewer tool calls · 100% local**
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[](https://www.npmjs.com/package/@colbymchenry/codegraph)
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[](https://opensource.org/licenses/MIT)
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[](https://nodejs.org/)
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[](#)
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[](#)
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[](#)
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[](#)
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[](#)
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[](#)
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[](#)
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<br />
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### Get Started
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```bash
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npx @colbymchenry/codegraph
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```
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<sub>Interactive installer auto-configures your agent(s) — Claude Code, Cursor, Codex CLI, opencode</sub>
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#### Initialize Projects
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```bash
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cd your-project
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codegraph init -i
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```
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</div>
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---
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## Why CodeGraph?
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When Claude Code explores a codebase, it spawns **Explore agents** that scan files with grep, glob, and Read — consuming tokens on every tool call.
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**CodeGraph gives those agents a pre-indexed knowledge graph** — symbol relationships, call graphs, and code structure. Agents query the graph instantly instead of scanning files.
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### Benchmark Results
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Tested across **7 real-world open-source codebases** spanning 7 languages, comparing an agent (Claude Code, headless) answering one architecture question **with** and **without** CodeGraph. Each cell is the savings at the **median of 4 runs per arm**.
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> **Average: 35% cheaper · 59% fewer tokens · 49% faster · 70% fewer tool calls**
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| Codebase | Language | Cost | Tokens | Time | Tool calls |
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|----------|----------|------|--------|------|------------|
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| **VS Code** | TypeScript · ~10k files | 35% cheaper | 73% fewer | 41% faster | 72% fewer |
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| **Excalidraw** | TypeScript · ~600 | 47% cheaper | 73% fewer | 60% faster | 86% fewer |
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| **Django** | Python · ~2.7k | 34% cheaper | 64% fewer | 59% faster | 81% fewer |
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| **Tokio** | Rust · ~700 | 52% cheaper | 81% fewer | 63% faster | 89% fewer |
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| **OkHttp** | Java · ~640 | 17% cheaper | 41% fewer | 36% faster | 64% fewer |
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| **Gin** | Go · ~150 | 22% cheaper | 23% fewer | 34% faster | 19% fewer |
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| **Alamofire** | Swift · ~100 | 38% cheaper | 59% fewer | 51% faster | 77% fewer |
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The gains scale with codebase size: on large repos the agent answers from the index in a handful of calls with **zero file reads**, while the no-CodeGraph agent fans out across grep/find/Read (and the sub-agents it spawns). On a small repo like Gin (~150 files) native search is already cheap, so the margin narrows.
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<details>
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<summary><strong>Full benchmark details</strong></summary>
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**Methodology.** Each arm is `claude -p` (Claude Opus 4.7, Claude Code v2.1.145) run headlessly against the repo with `--strict-mcp-config`: **WITH** = CodeGraph's MCP server enabled, **WITHOUT** = an empty MCP config. Built-in Read/Grep/Bash stay available to both. Same question per repo, **4 runs per arm, median reported**. Cost = the run's `total_cost_usd`; Tokens = total tokens processed (input incl. cached + output); Time = wall-clock; Tool calls = every tool invocation, including those inside any sub-agents the model spawns. Repos cloned at `--depth 1` and indexed by the same CodeGraph build that served them.
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**Queries:**
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| Codebase | Query |
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|----------|-------|
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| VS Code | "How does the extension host communicate with the main process?" |
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| Excalidraw | "How does Excalidraw render and update canvas elements?" |
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| Django | "How does Django's ORM build and execute a query from a QuerySet?" |
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| Tokio | "How does tokio schedule and run async tasks on its runtime?" |
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| OkHttp | "How does OkHttp process a request through its interceptor chain?" |
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| Gin | "How does gin route requests through its middleware chain?" |
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| Alamofire | "How does Alamofire build, send, and validate a request?" |
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**Raw medians — WITH → WITHOUT:**
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| Codebase | Cost | Tokens | Time | Tool calls |
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|----------|------|--------|------|------------|
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| VS Code | $0.42 → $0.64 | 393k → 1.4M | 1m 0s → 1m 43s | 7 → 23 |
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| Excalidraw | $0.54 → $1.02 | 851k → 3.2M | 1m 17s → 3m 14s | 12 → 83 |
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| Django | $0.41 → $0.62 | 499k → 1.4M | 1m 0s → 2m 25s | 9 → 48 |
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| Tokio | $0.50 → $1.04 | 657k → 3.4M | 1m 5s → 2m 56s | 9 → 75 |
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| OkHttp | $0.36 → $0.44 | 352k → 596k | 45s → 1m 11s | 5 → 14 |
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| Gin | $0.36 → $0.46 | 431k → 562k | 47s → 1m 11s | 7 → 8 |
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| Alamofire | $0.61 → $0.99 | 1.1M → 2.6M | 1m 19s → 2m 41s | 15 → 64 |
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**Why CodeGraph wins:** with the index available, the agent answers directly — `codegraph_context` to map the area, then one `codegraph_explore` for the relevant source — and stops, usually with zero file reads. Without it, the agent (and the Explore sub-agents it spawns) spends most of its budget on discovery (find/ls/grep) before reading the right code. CodeGraph only helps when queried *directly*, so its instructions steer agents to answer directly rather than delegate exploration to file-reading sub-agents — otherwise a sub-agent reads files regardless and CodeGraph becomes overhead.
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</details>
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---
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## Key Features
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| **Smart Context Building** | One tool call returns entry points, related symbols, and code snippets — no expensive exploration agents |
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| **Full-Text Search** | Find code by name instantly across your entire codebase, powered by FTS5 |
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| **Impact Analysis** | Trace callers, callees, and the full impact radius of any symbol before making changes |
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| **Always Fresh** | File watcher uses native OS events (FSEvents/inotify/ReadDirectoryChangesW) with debounced auto-sync — the graph stays current as you code, zero config |
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| **19+ Languages** | TypeScript, JavaScript, Python, Go, Rust, Java, C#, PHP, Ruby, C, C++, Swift, Kotlin, Dart, Svelte, Liquid, Pascal/Delphi |
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| **Framework-aware Routes** | Recognizes web-framework routing files and links URL patterns to their handlers across 13 frameworks |
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| **100% Local** | No data leaves your machine. No API keys. No external services. SQLite database only |
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---
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## Framework-aware Routes
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CodeGraph detects web-framework routing files and emits `route` nodes linked by `references` edges to their handler classes or functions. Querying callers of a view/controller now surfaces the URL pattern that binds it.
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| Framework | Shapes recognized |
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|---|---|
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| **Django** | `path()`, `re_path()`, `url()`, `include()` in `urls.py` (CBV `.as_view()`, dotted paths) |
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| **Flask** | `@app.route('/path', methods=[...])`, blueprint routes |
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| **FastAPI** | `@app.get(...)`, `@router.post(...)`, all standard methods |
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| **Express** | `app.get(...)`, `router.post(...)` with middleware chains |
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| **NestJS** | `@Controller` + `@Get/@Post/...`, GraphQL `@Resolver` + `@Query/@Mutation`, `@MessagePattern`/`@EventPattern`, `@SubscribeMessage` |
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| **Laravel** | `Route::get()`, `Route::resource()`, `Controller@action`, tuple syntax |
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| **Rails** | `get '/x', to: 'users#index'`, hash-rocket `=>` syntax |
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| **Spring** | `@GetMapping`, `@PostMapping`, `@RequestMapping` on methods |
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| **Gin / chi / gorilla / mux** | `r.GET(...)`, `router.HandleFunc(...)` |
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| **Axum / actix / Rocket** | `.route("/x", get(handler))` |
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| **ASP.NET** | `[HttpGet("/x")]` attributes on action methods |
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| **Vapor** | `app.get("x", use: handler)` |
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| **React Router** / **SvelteKit** | Route component nodes |
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---
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## Quick Start
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### 1. Run the Installer
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```bash
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npx @colbymchenry/codegraph
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```
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The installer will:
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- Ask which agent(s) to configure — auto-detects installed ones from: **Claude Code**, **Cursor**, **Codex CLI**, **opencode**
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- Prompt to install `codegraph` on your PATH (so agents can launch the MCP server)
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- Ask whether configs apply to all your projects or just this one
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- Write each chosen agent's MCP server config + an instructions file (e.g. `CLAUDE.md`, `.cursor/rules/codegraph.mdc`, `~/.codex/AGENTS.md`)
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- Set up auto-allow permissions when Claude Code is one of the targets
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- Initialize your current project (local installs only)
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**Non-interactive (scripting / CI):**
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```bash
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codegraph install --yes # auto-detect agents, install global
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codegraph install --target=cursor,claude --yes # explicit target list
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codegraph install --target=auto --location=local # detected agents, project-local
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codegraph install --print-config codex # print snippet, no file writes
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```
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| Flag | Values | Default |
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|---|---|---|
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| `--target` | `auto`, `all`, `none`, or csv (`claude,cursor,...`) | prompt |
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| `--location` | `global`, `local` | prompt |
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| `--yes` | (boolean) | prompt every step |
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| `--no-permissions` | (boolean) skip Claude auto-allow list | permissions on |
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| `--print-config <id>` | dump snippet for one agent and exit | — |
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### 2. Restart Your Agent
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Restart your agent (Claude Code / Cursor / Codex CLI / opencode) for the MCP server to load.
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### 3. Initialize Projects
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```bash
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cd your-project
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codegraph init -i
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```
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Builds the per-project knowledge graph index. Also wires up any project-local agent surfaces (e.g. Cursor's `.cursor/rules/codegraph.mdc`) so a single global `codegraph install` works in every project you open — no need to re-run the installer per project.
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That's it — your agent will use CodeGraph tools automatically when a `.codegraph/` directory exists.
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<details>
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<summary><strong>Manual Setup (Alternative)</strong></summary>
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**Install globally:**
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```bash
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npm install -g @colbymchenry/codegraph
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```
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**Add to `~/.claude.json`:**
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```json
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{
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"mcpServers": {
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"codegraph": {
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"type": "stdio",
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"command": "codegraph",
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"args": ["serve", "--mcp"]
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}
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}
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}
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```
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**Add to `~/.claude/settings.json` (optional, for auto-allow):**
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```json
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{
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"permissions": {
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"allow": [
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"mcp__codegraph__codegraph_search",
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"mcp__codegraph__codegraph_context",
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"mcp__codegraph__codegraph_callers",
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"mcp__codegraph__codegraph_callees",
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"mcp__codegraph__codegraph_impact",
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"mcp__codegraph__codegraph_node",
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"mcp__codegraph__codegraph_status",
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"mcp__codegraph__codegraph_files"
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]
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}
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}
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```
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</details>
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<details>
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<summary><strong>Global Instructions Reference</strong></summary>
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The installer automatically adds these instructions to `~/.claude/CLAUDE.md`:
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```markdown
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## CodeGraph
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CodeGraph builds a semantic knowledge graph of codebases for faster, smarter code exploration.
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### If `.codegraph/` exists in the project
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**NEVER call `codegraph_explore` or `codegraph_context` directly in the main session.** These tools return large amounts of source code that fills up main session context. Instead, ALWAYS spawn an Explore agent for any exploration question (e.g., "how does X work?", "explain the Y system", "where is Z implemented?").
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**When spawning Explore agents**, include this instruction in the prompt:
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> This project has CodeGraph initialized (.codegraph/ exists). Use `codegraph_explore` as your PRIMARY tool — it returns full source code sections from all relevant files in one call.
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>
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> **Rules:**
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> 1. Follow the explore call budget in the `codegraph_explore` tool description — it scales automatically based on project size.
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> 2. Do NOT re-read files that codegraph_explore already returned source code for. The source sections are complete and authoritative.
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> 3. Only fall back to grep/glob/read for files listed under "Additional relevant files" if you need more detail, or if codegraph returned no results.
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**The main session may only use these lightweight tools directly** (for targeted lookups before making edits, not for exploration):
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| Tool | Use For |
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|------|---------|
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| `codegraph_search` | Find symbols by name |
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| `codegraph_callers` / `codegraph_callees` | Trace call flow |
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| `codegraph_impact` | Check what's affected before editing |
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| `codegraph_node` | Get a single symbol's details |
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### If `.codegraph/` does NOT exist
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At the start of a session, ask the user if they'd like to initialize CodeGraph:
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"I notice this project doesn't have CodeGraph initialized. Would you like me to run `codegraph init -i` to build a code knowledge graph?"
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```
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</details>
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---
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## How It Works
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```
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┌─────────────────────────────────────────────────────────────────┐
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│ Claude Code │
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│ │
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│ "Implement user authentication" │
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│ │ │
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│ ▼ │
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│ ┌─────────────────┐ ┌─────────────────┐ │
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│ │ Explore Agent │ ──── │ Explore Agent │ │
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│ └────────┬────────┘ └────────┬────────┘ │
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│ │ │ │
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└───────────┼────────────────────────┼─────────────────────────────┘
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│ │
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▼ ▼
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┌───────────────────────────────────────────────────────────────────┐
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│ CodeGraph MCP Server │
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│ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ │
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│ │ Search │ │ Callers │ │ Context │ │
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│ │ "auth" │ │ "login()" │ │ for task │ │
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│ └──────┬──────┘ └──────┬──────┘ └──────┬──────┘ │
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│ │ │ │ │
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│ └────────────────┼────────────────┘ │
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│ ▼ │
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│ ┌───────────────────────┐ │
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│ │ SQLite Graph DB │ │
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│ │ • 387 symbols │ │
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│ │ • 1,204 edges │ │
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│ │ • Instant lookups │ │
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│ └───────────────────────┘ │
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└───────────────────────────────────────────────────────────────────┘
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```
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1. **Extraction** — [tree-sitter](https://tree-sitter.github.io/) parses source code into ASTs. Language-specific queries extract nodes (functions, classes, methods) and edges (calls, imports, extends, implements).
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2. **Storage** — Everything goes into a local SQLite database (`.codegraph/codegraph.db`) with FTS5 full-text search.
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3. **Resolution** — After extraction, references are resolved: function calls → definitions, imports → source files, class inheritance, and framework-specific patterns.
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4. **Auto-Sync** — The MCP server watches your project using native OS file events. Changes are debounced (2-second quiet window), filtered to source files only, and incrementally synced. The graph stays fresh as you code — no configuration needed.
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---
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## CLI Reference
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```bash
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codegraph # Run interactive installer
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codegraph install # Run installer (explicit)
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codegraph init [path] # Initialize in a project (--index to also index)
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codegraph uninit [path] # Remove CodeGraph from a project (--force to skip prompt)
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codegraph index [path] # Full index (--force to re-index, --quiet for less output)
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codegraph sync [path] # Incremental update
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codegraph status [path] # Show statistics
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codegraph query <search> # Search symbols (--kind, --limit, --json)
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codegraph files [path] # Show file structure (--format, --filter, --max-depth, --json)
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codegraph context <task> # Build context for AI (--format, --max-nodes)
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codegraph affected [files...] # Find test files affected by changes (see below)
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codegraph serve --mcp # Start MCP server
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```
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### `codegraph affected`
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Traces import dependencies transitively to find which test files are affected by changed source files.
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```bash
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codegraph affected src/utils.ts src/api.ts # Pass files as arguments
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git diff --name-only | codegraph affected --stdin # Pipe from git diff
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codegraph affected src/auth.ts --filter "e2e/*" # Custom test file pattern
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```
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| Option | Description | Default |
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|--------|-------------|---------|
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| `--stdin` | Read file list from stdin | `false` |
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| `-d, --depth <n>` | Max dependency traversal depth | `5` |
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| `-f, --filter <glob>` | Custom glob to identify test files | auto-detect |
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| `-j, --json` | Output as JSON | `false` |
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| `-q, --quiet` | Output file paths only | `false` |
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**CI/hook example:**
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```bash
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#!/usr/bin/env bash
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AFFECTED=$(git diff --name-only HEAD | codegraph affected --stdin --quiet)
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if [ -n "$AFFECTED" ]; then
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npx vitest run $AFFECTED
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fi
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```
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---
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## MCP Tools
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When running as an MCP server, CodeGraph exposes these tools to Claude Code:
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| Tool | Purpose |
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|------|---------|
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| `codegraph_search` | Find symbols by name across the codebase |
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| `codegraph_context` | Build relevant code context for a task |
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| `codegraph_callers` | Find what calls a function |
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| `codegraph_callees` | Find what a function calls |
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| `codegraph_impact` | Analyze what code is affected by changing a symbol |
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| `codegraph_node` | Get details about a specific symbol (optionally with source code) |
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| `codegraph_files` | Get indexed file structure (faster than filesystem scanning) |
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| `codegraph_status` | Check index health and statistics |
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---
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## Library Usage
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```typescript
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import CodeGraph from '@colbymchenry/codegraph';
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const cg = await CodeGraph.init('/path/to/project');
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// Or: const cg = await CodeGraph.open('/path/to/project');
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await cg.indexAll({
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onProgress: (p) => console.log(`${p.phase}: ${p.current}/${p.total}`)
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});
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const results = cg.searchNodes('UserService');
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const callers = cg.getCallers(results[0].node.id);
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const context = await cg.buildContext('fix login bug', { maxNodes: 20, includeCode: true, format: 'markdown' });
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const impact = cg.getImpactRadius(results[0].node.id, 2);
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cg.watch(); // auto-sync on file changes
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cg.unwatch(); // stop watching
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cg.close();
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```
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---
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## Configuration
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The `.codegraph/config.json` file controls indexing:
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```json
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{
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"version": 1,
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"languages": ["typescript", "javascript"],
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"exclude": ["node_modules/**", "dist/**", "build/**", "*.min.js"],
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"frameworks": [],
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"maxFileSize": 1048576,
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"extractDocstrings": true,
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"trackCallSites": true
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}
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```
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| Option | Description | Default |
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|--------|-------------|---------|
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| `languages` | Languages to index (auto-detected if empty) | `[]` |
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| `exclude` | Glob patterns to ignore | `["node_modules/**", ...]` |
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| `frameworks` | Framework hints for better resolution | `[]` |
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| `maxFileSize` | Skip files larger than this (bytes) | `1048576` (1MB) |
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| `extractDocstrings` | Extract docstrings from code | `true` |
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| `trackCallSites` | Track call site locations | `true` |
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## Supported Languages
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| Language | Extension | Status |
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|----------|-----------|--------|
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| TypeScript | `.ts`, `.tsx` | Full support |
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| JavaScript | `.js`, `.jsx`, `.mjs` | Full support |
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| Python | `.py` | Full support |
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| Go | `.go` | Full support |
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| Rust | `.rs` | Full support |
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| Java | `.java` | Full support |
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| C# | `.cs` | Full support |
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| PHP | `.php` | Full support |
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| Ruby | `.rb` | Full support |
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| C | `.c`, `.h` | Full support |
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| C++ | `.cpp`, `.hpp`, `.cc` | Full support |
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| Swift | `.swift` | Full support |
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| Kotlin | `.kt`, `.kts` | Full support |
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| Scala | `.scala`, `.sc` | Full support (classes, traits, methods, type aliases, Scala 3 enums) |
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| Dart | `.dart` | Full support |
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|
| Svelte | `.svelte` | Full support (script extraction, Svelte 5 runes, SvelteKit routes) |
|
|
| Vue | `.vue` | Full support (script + script-setup extraction, Nuxt page/API/middleware routes) |
|
|
| Liquid | `.liquid` | Full support |
|
|
| Pascal / Delphi | `.pas`, `.dpr`, `.dpk`, `.lpr` | Full support (classes, records, interfaces, enums, DFM/FMX form files) |
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## Troubleshooting
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**"CodeGraph not initialized"** — Run `codegraph init` in your project directory first.
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**Indexing is slow** — Check that `node_modules` and other large directories are excluded. Use `--quiet` to reduce output overhead.
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**Indexing is slow / MCP `database is locked` / WASM fallback active** — `codegraph` ships with a WASM SQLite fallback for environments where `better-sqlite3` (a native module, declared as `optionalDependencies`) can't install. The fallback is 5-10x slower than the native backend and uses a journal mode that lets writers block readers, so MCP queries can also hit `database is locked` while indexing runs. Run `codegraph status` and look at the `Backend:` line:
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- `Backend: native` — you're on the fast path, nothing to do.
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- `Backend: wasm` — you're on the slow fallback. Common causes: missing C build tools, prebuilt binary unavailable for your Node version, or your Node version changed after install. Fix:
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```bash
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# macOS
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xcode-select --install # installs the C compiler
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# Linux (Debian / Ubuntu)
|
|
sudo apt install build-essential python3 make
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# Linux (RHEL / Fedora)
|
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sudo yum groupinstall "Development Tools"
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|
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# Then rebuild on any platform:
|
|
npm rebuild better-sqlite3
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|
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# Or force-include as a hard dep:
|
|
npm install better-sqlite3 --save
|
|
```
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After the fix, `codegraph status` should show `Backend: native`.
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**MCP server not connecting** — Ensure the project is initialized/indexed, verify the path in your MCP config, and check that `codegraph serve --mcp` works from the command line.
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**Missing symbols** — The MCP server auto-syncs on save (wait a couple seconds). Run `codegraph sync` manually if needed. Check that the file's language is supported and isn't excluded by config patterns.
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## Star History
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<a href="https://www.star-history.com/?repos=colbymchenry%2Fcodegraph&type=date&legend=top-left">
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<picture>
|
|
<source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/chart?repos=colbymchenry/codegraph&type=date&theme=dark&legend=top-left" />
|
|
<source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/chart?repos=colbymchenry/codegraph&type=date&legend=top-left" />
|
|
<img alt="Star History Chart" src="https://api.star-history.com/chart?repos=colbymchenry/codegraph&type=date&legend=top-left" />
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</picture>
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</a>
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## License
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MIT
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---
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<div align="center">
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**Made for AI coding agents — Claude Code, Cursor, Codex CLI, and opencode**
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[Report Bug](https://github.com/colbymchenry/codegraph/issues) · [Request Feature](https://github.com/colbymchenry/codegraph/issues)
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</div>
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