# foldwork-dev/mcp-injector [Health: Active] **Category:** πŸ€– Coding Agents **Repository:** https://github.com/foldwork-dev/mcp-injector **GitHub Stars:** 4 **Views:** 2 **Installs:** 0 **Upvotes:** 0 **Directory Page:** https://allmcps.com/mcp/foldwork-dev-mcp-injector ## Description Local MCP daemon that pre-indexes your codebase into a SQLite catalog and serves AST-compressed snapshots to Claude Code, Cursor, and VS Code on every query. Reduces token usage by 41-89% on real codebases (verified across Django, Tokio, Gin, and more). Single Go binary, zero config. Free for codebases under 100K lines. ## Claude Desktop Quick Installation Heuristic fallback β€” verify the package name and runner against the repository README before running it. Uses `npx` (confidence: low): ```json "mcpServers": { "mcp-injector": { "command": "npx", "args": ["-y","foldwork-dev-mcp-injector"] } } ``` ## Documentation & README # mcp-injector AI coding assistants often fail because they retrieve the wrong context. On a large codebase, blindly dumping raw files into the prompt leads to hallucinations, slow responses, and high API costs. Foldwork fixes this. It is a deterministic repository understanding engine that pre-indexes your entire codebase into a local SQLite catalog. It acts as the Context Layer for your IDE, serving exactly the functions the AI needsβ€”no more, no lessβ€”maximizing the first-try success rate and reducing token usage by 41-89%. By combining AST body folding (which strips out function bodies while preserving signatures) with canonical determinism (which guarantees byte-identical outputs to maximize Anthropic's KV cache hits), Foldwork transforms massive enterprise monorepos into lightweight, cache-friendly payloads. This drastically reduces token consumption, cuts API costs by up to 90%, and eliminates context window overflow. No cloud. No telemetry. Runs entirely on your machine.-- ## Real-World Codebase Context Benchmarks Estimate the impact of AST code compression on large open-source repositories (calculated at $2.00 / million input tokens for Claude Sonnet 5): | Repository | Total Files | Raw Context Tokens | Compressed Context Tokens | Token Reduction | Cost Saved / Run | | :--- | :---: | :---: | :---: | :---: | :---: | | **Django** | 2,359 | 5,554,607 | 596,752 | **89.3%** | **$10.99** | | **Tokio** | 789 | 1,597,813 | 444,164 | **72.2%** | **$3.11** | | **Gin** | 99 | 197,300 | 47,718 | **75.8%** | **$0.39** | *Numbers are reproducible. Run the open-source benchmark tool on any public repository:* **[mcp-benchmark repository](https://github.com/foldwork-dev/mcp-benchmark)** --- ## What It Looks Like Run `mcp-benchmark` on your own project to see your exact savings before installing anything: ```text mcp-benchmark ./your-project ════════════════════════════════════════════════════════════════════════════════ mcp-injector Benchmark β€” context Tier 3 compression | $2.00/1M tokens | 2026-07-15T12:00:00Z ════════════════════════════════════════════════════════════════════════════════ FILE RAW TOKENS COMPRESSED SAVED COST SAVED* ────────────────────────────────────────────────────────────────────────────────────────── cmd/license-gen/main.go 3,633 214 94% $0.0072 main.go 17,555 1,917 89% $0.0347 website/api/webhook.go 2,682 295 89% $0.0053 main_test.go 1,576 353 78% $0.0031 ────────────────────────────────────────────────────────────────────────────────────────── TOTAL (4 files) 25,446 2,779 89.1% $0.0503 * Based on $2.00 / 1M input tokens πŸ’‘ Running this codebase through Claude 10Γ—/day costs $0.51/day raw. With mcp-injector: $0.01/day. You save $0.50/day ($15/month). ``` --- ## Tools ### `get_project_map` Returns a compressed structural overview of the workspace. Function bodies are folded and replaced with placeholders to reduce token usage. - `tier` (integer, optional): Compression tier to apply (default: 2). - `unfolded_files` (array of strings, optional): Workspace-relative paths or glob patterns for files to serve at full resolution (uncompressed). - `path_prefixes` (array of strings, optional): Scope the project map to specific microservices or packages, drastically reducing payload bloat. - `git_context`: always includes current branch, changed files, and recent commits in the response. - `secrets_redacted`: count of credentials automatically redacted before sending to Claude. Example call: ```json { "tool": "get_project_map", "arguments": { "tier": 3, "unfolded_files": ["src/auth/handler.go", "**/*_test.go"], "path_prefixes": ["src/auth/"] } } ``` ### `injector_retrieve` Retrieves the full uncompressed source of a file from the local cache. - `path` (string, required): The workspace-relative path of the file to retrieve. - `retrievalKey` (string, optional): The SHA-256 retrieval key returned in a prior compressed payload. - `start_line` (integer, optional): 1-indexed start line for range retrieval. - `end_line` (integer, optional): 1-indexed end line for range retrieval. - `expand_graph` (boolean, optional): Resolves and appends cross-file dependencies (limited to 50 1st-degree dependencies). ### `injector_search` BM25-ranked full-text symbol search over the local SQLite catalog. Supports FTS5 boolean logic (e.g., `user AND (auth OR login)`). - `query` (string, required): FTS5 query string (bare terms, "phrase", prefix*). - `limit` (integer, optional): Maximum results (default: 20). - `search_paths` (array of strings, optional): Scope search to specific isolated directories. ### `injector_diagram` Generates a Mermaid sequence diagram for a given symbol by traversing its outbound dependencies (halts after 500 nodes). - `symbol` (string, required): The exact symbol name. - `max_depth` (integer, optional): Maximum traversal depth (default: 3). - `include_primitives` (boolean, optional): Include basic types (String, boolean) and framework boundaries. ### `injector_regex_search` Fallback for exact literal or regex searches against file contents. Bypasses FTS5 tokenization. - `query` (string, required): The string or regex pattern to search for. - `is_regex` (boolean, optional): Treats query as extended regex (-E). ### `injector_write_file` Write a full file to disk. CRITICAL: Prevents data loss by intercepting and rejecting payloads containing compressed fold markers. ### `injector_blast_radius` Analyzes the architectural impact of changing a symbol by traversing the dependency graph. Supports inbound and outbound directional traversal. ### `injector_git_context` Integrates with local Git history to surface commit context, authorship, and code evolution directly into the LLM context. ### `injector_inspect_table` Enables direct database introspection capabilities. Currently supports PostgreSQL and MySQL. *CRITICAL:* You must start the daemon with the `FOLDWORK_DB_DSN` environment variable set to your database connection string (e.g. `postgres://user:pass@localhost:5432/dbname`) to activate this tool. ### `injector_clear_cache` Wipes the SQLite index cache and triggers a clean cold-start full re-index. ### `injector_stats` Returns index status, current compression ratio, total files indexed, and cache hit rate. ### `injector_sync` (Deprecated) Read tools automatically wait for pending indexing implicitly. You never need to manually call this tool. --- ## Quick Install Install the daemon locally and configure your IDEs: ```bash curl -fsSL https://foldwork.dev/install | sh ``` *Automatically configures **Claude Desktop**, **Cursor IDE**, **VS Code**, **Devin Desktop**, and **Antigravity**.* --- ## Getting Started ### Step 1: Check if your project qualifies for the free tier Run the benchmark CLI on your project to see your token savings and line count: ```bash mcp-benchmark ./your-project ``` If your project is under 50,000 lines, mcp-injector is completely free. The benchmark output shows your exact line count. ### Step 2: Install the daemon ```bash curl -fsSL https://foldwork.dev/install | sh ``` The installer auto-detects Claude Desktop, Cursor, VS Code, Devin Desktop, and Antigravity and writes the MCP config automatically. You should see output like: ```text * mcp-injector v0.2.0 installed to /usr/local/bin/mcp-injector * Claude Desktop configured * Cursor configured Restart your IDE and mcp-injector will be active. ``` ### Step 3: Restart your IDE The MCP server starts automatically when your IDE launches. No separate daemon process to manage. ### Step 4: Verify it is working In Claude Code or Cursor, ask Claude: > "Use get_project_map to show me the structure of this project" Claude will call the mcp-injector tool and return a compressed map of your entire codebase. If you see module names, entry points, and dependency information - it is working. ### Step 5: Get the full source when needed When Claude needs to see the complete implementation of a compressed function, it automatically calls `injector_retrieve`. You can also trigger this explicitly: > "Show me the full implementation of UserService.java" Claude will fetch the uncompressed source from the local cache. **Editing Code:** You MUST use the `injector_write_file` tool to edit code. If Claude tries to write back folded placeholders into your source code, the daemon will hard-reject the payload to protect you from data loss. ### Step 6: Check your savings ```bash injector_stats ``` Or ask Claude directly: "Call injector_stats and tell me my current token savings." --- ## Agent Use Cases & Advanced Usage Now that your AI has deterministic tools to search, traverse, and retrieve code, you can ask it high-level architectural questions that usually fail on raw codebases: - **Trace authentication flow** β€” Ask the agent to map out your login sequence; it will use `injector_retrieve` with `expand_graph=true` to traverse through middleware, validation, and database layers. - **Find dead code** β€” The agent can leverage `injector_blast_radius` (inbound traversal) to identify unused functions and isolated structs. - **Generate architecture diagrams** β€” Tell your AI to "Generate a Mermaid diagram for this workflow"; it uses `injector_diagram` to instantly draw the entire outbound execution sequence. - **Understand dependency graphs** β€” Use `injector_blast_radius` to see exactly what services or packages rely on a specific core module. - **Locate implementations** β€” The agent uses `injector_search` (BM25 full-text indexing) to find exact function definitions across millions of lines of code. - **Refactor safely** β€” Before making a breaking change, the agent checks `injector_blast_radius` to see every caller that will be impacted. - **Review pull requests** β€” Instruct the agent to analyze your uncommitted changes or branch diff. It uses `injector_git_context` to understand recent commits and author intent alongside the code. - **Navigate large monorepos** β€” `get_project_map` gives the AI a compressed, birds-eye view of your entire architecture, allowing it to drill down into specific microservices using `path_prefixes`. ### Inspecting specific files uncompressed Sometimes you need Claude to see the exact implementation of a file while keeping the rest compressed. Use the `unfolded_files` parameter: In your MCP call or by asking Claude: > "Get the project map but show me src/auth/handler.go at full resolution" This passes `"unfolded_files": ["src/auth/handler.go"]` to get_project_map. That file is served raw; everything else stays compressed. Glob patterns work too: - `"**/*_test.go"` - all test files uncompressed - `"src/auth/*.go"` - all files in a directory uncompressed ### Switching branches mcp-injector installs a `post-checkout` git hook when it first runs. Branch switching automatically triggers a full re-index. You will see this in the daemon logs: ```text [mcp-injector] Branch switched to feature/auth-refactor, re-indexing... [mcp-injector] Re-index complete in 4.2s (47,293 lines indexed) ``` ### Security First: Zero-Leak Guarantee Enterprise security teams often block AI coding tools because developers accidentally leak sensitive credentials in their context window. mcp-injector solves this locally. The daemon includes a built-in Shannon entropy filter that analyzes all AST strings and comments in real-time. If it detects high-entropy strings (like AWS Access Keys, SSH private keys, or database passwords), it dynamically redacts them as `[REDACTED: high entropy]` *before* they ever leave your machine. Your API credentials are never sent to Anthropic. If your codebase has a hardcoded API key or AWS credential, the `get_project_map` response will include: ```json "secrets_redacted": 2, "files_with_redactions": ["config/db.go", "scripts/deploy.sh"] ``` The actual values are replaced with `[REDACTED: high entropy]`. Variable names are preserved so Claude still understands the code structure. ### Manual MCP configuration If the auto-installer does not detect your IDE, add this to your MCP config manually: ```json { "mcpServers": { "mcp-injector": { "command": "/usr/local/bin/mcp-injector", "env": { "MCP_WORKSPACE": "/absolute/path/to/your/project", "FOLDWORK_DB_DSN": "postgres://user:pass@localhost:5432/dbname" } } } } ``` > **Note:** VS Code supports `"${workspaceFolder}"`, but Claude Desktop, Cursor, and Devin Desktop require a hardcoded absolute path to your project. Config file locations: - Claude Desktop (Mac): `~/Library/Application Support/Claude/claude_desktop_config.json` - Claude Desktop (Windows): `%APPDATA%\Claude\claude_desktop_config.json` - Claude Desktop (Linux): `~/.config/Claude/claude_desktop_config.json` - Cursor: `~/.cursor/mcp.json` - VS Code: `.vscode/mcp.json` - Devin Desktop: `~/.codeium/windsurf/mcp_config.json` - Antigravity: `~/.gemini/antigravity/mcp_config.json` --- ## How It Works * **Incremental Parsing:** Foldwork scans your repository instantly using a single-pass AST parser, identifying all interfaces, classes, and function signatures without blocking. * **Graph Generation:** It deterministically builds two structures: a Symbol Graph for precise definitions, and a Dependency Graph tracking outbound caller/callee relationships. * **Local Catalog:** The graphs are durably stored in a local SQLite FTS5 catalog. Indexing happens exactly once per file change, meaning zero overhead during AI prompts. * **MCP Serving:** Your AI agent securely communicates with Foldwork via the Model Context Protocol, fetching sub-graphs in milliseconds without the code ever leaving your machine. * **Branch-Aware & Deterministic:** Switching branches triggers automatic incremental re-indexing via git hooks. By guaranteeing byte-identical outputs across runs, Foldwork maximizes Claude's **KV prompt caching** hits. **Supports:** Go, Python, TypeScript, JavaScript, Java, C++, C, C#, Rust. --- ## Pricing Tiers * **Free Tier:** Workspaces under 50,000 total source lines (all tools and features fully active). * **Pro Tier ($12/month or $99/year):** Unlocks unlimited workspace sizes and high-speed incremental diff indexing. **[Activate Pro at foldwork.dev](https://foldwork.dev/#pricing)** --- ## Check your ROI (Savings Dashboard) You can run `mcp-injector status` in your terminal at any time. This CLI dashboard visually proves your exact token savings and estimated dollars saved by comparing your raw codebase tokens against the AST-compressed tokens in real-time. --- ## Security mcp-injector automatically redacts secrets and credentials before they reach Claude's context window: - AWS access keys, GitHub PATs, Stripe secret keys - JWT tokens and bearer tokens - High-entropy strings detected via Shannon entropy analysis - Private key headers (`-----BEGIN RSA PRIVATE KEY-----`) - **Air-Gapped Ready:** Pro license validation uses strictly offline Ed25519 cryptography. The daemon never makes an outbound network request, even to verify your subscription. Redacted content is replaced with `[REDACTED BY MCP-INJECTOR]`. A count of redactions is included in the `get_project_map` response so you always know what was protected. Your code never leaves your machine. Redaction happens locally before compression, and is always-on - it cannot be disabled. --- ## Uninstall To remove mcp-injector completely: ```bash # Remove binary sudo rm /usr/local/bin/mcp-injector # Remove index cache and logs rm -rf ~/.mcp-injector/ # Remove from IDE MCP config (edit manually): # Claude Desktop (Linux): ~/.config/Claude/claude_desktop_config.json # Claude Desktop (macOS): ~/Library/Application Support/Claude/claude_desktop_config.json # Cursor: ~/.cursor/mcp.json # VS Code: .vscode/mcp.json # Devin Desktop: ~/.codeium/windsurf/mcp_config.json # Antigravity: ~/.gemini/antigravity/mcp_config.json # (Remove the "mcp-injector" entry from mcpServers) ``` --- ## What Gets Redacted mcp-injector automatically redacts the following before your code reaches Claude: | Pattern | Example Match | | :--- | :--- | | AWS access key IDs | `AKIAIOSFODNN7EXAMPLE` | | GitHub PATs (ghp_, ghs_) | `ghp_aBcDeFg...` | | Stripe secret keys | `sk_live_abc...` / `sk_test_abc...` | | JWT tokens | `eyJ...` | | PEM private key headers | `-----BEGIN RSA PRIVATE KEY-----` | | Generic high-entropy strings >20 chars | Detected via Shannon entropy | | Password / secret / token assignments | `password = "abc123"` | Redacted values are replaced with `[REDACTED BY MCP-INJECTOR]`. File paths and variable **names** are never redacted - only the values. --- ## License Commercial. Free tier available. Source code not public. Support Contact: [foldwork@proton.me](mailto:foldwork@proton.me)