LibgenMCP

# AnnasArchiveMCP A Rust MCP server for searching books through Anna's Archive via RapidAPI and downloading selected results safely to your machine. ## How to use This section is a practical manual for getting AnnasArchiveMCP running and using it from an MCP client. ### 1. Build the server Clone the repository and compile the binary: ```sh git clone <your-repo-url> cd AnnasArchiveMCP cargo build --release ``` The compiled binary will be: ```sh target/release/annas-archive-mcp ``` ### 2. Get a RapidAPI key AnnasArchiveMCP needs a RapidAPI key that has access to the Anna's Archive API. Set it in your environment before starting the server: ```sh export RAPIDAPI_KEY=your_api_key_here ``` You can also place it in a local `.env` file if that fits your setup better. ### 3. Configure optional defaults You can run with only `RAPIDAPI_KEY`, but these optional variables are useful: - `RAPIDAPI_HOST` — defaults to `annas-archive-api.p.rapidapi.com` - `ANNAS_ARCHIVE_MCP_DOWNLOAD_DIR` — default folder for downloaded files - `ANNAS_ARCHIVE_MCP_OPEN_AFTER_DOWNLOAD` — `true` or `false` - `ANNAS_ARCHIVE_MCP_CREATE_SUBDIRS` — `true` or `false` - `ANNAS_ARCHIVE_MCP_OVERWRITE_DEFAULT` — `true` or `false` - `ANNAS_ARCHIVE_MCP_DEFAULT_LIMIT` — default number of search results - `ANNAS_ARCHIVE_MCP_MAX_LIMIT` — maximum allowed search results - `RUST_LOG` — log level such as `info` or `debug` Example: ```env RAPIDAPI_KEY=your_api_key_here ANNAS_ARCHIVE_MCP_DOWNLOAD_DIR=~/Downloads ANNAS_ARCHIVE_MCP_OPEN_AFTER_DOWNLOAD=false ANNAS_ARCHIVE_MCP_CREATE_SUBDIRS=true ANNAS_ARCHIVE_MCP_OVERWRITE_DEFAULT=false RUST_LOG=info ``` ### 4. Run the server Run it with Cargo during development: ```sh cargo run ``` Or run the compiled binary directly: ```sh ./target/release/annas-archive-mcp ``` The server uses stdio, so it is normally started by your MCP client instead of being used as a standalone interactive CLI. ### 5. Add it to your MCP client Point your MCP client at the built binary and provide the required environment variables. Example MCP client configuration: ```json { "mcpServers": { "annas-archive": { "command": "/absolute/path/to/AnnasArchiveMCP/target/release/annas-archive-mcp", "env": { "RAPIDAPI_KEY": "your_api_key_here", "RUST_LOG": "info" } } } } ``` Replace the path with the actual absolute path on your machine. ### 6. Search for books Use the `search_books` tool first. This is the recommended workflow. Typical search arguments: - `query` — the search text, for example a title, author, or both - `formats` — optional preferred formats such as `pdf` or `epub` - `languages` — optional language filters - `yearFrom` / `yearTo` — optional year range - `limit` — maximum number of results to return - `sort` — `relevance`, `year`, or `size` A typical search request would be conceptually like: - query: `clean code` - formats: `["pdf", "epub"]` - limit: `5` The response includes ranked results with stable `result_id` values. Save the `result_id` for the result you want to download. ### 7. Download a selected book After searching, use `download_book` with either: - `resultId` — recommended, because it comes directly from `search_books` - `providerItemId` — provider-native identifier Optional download arguments include: - `downloadDir` - `filenameTemplate` - `overwrite` - `openAfterDownload` - `createSubdirs` Typical workflow: 1. Search with `search_books` 2. Review the returned results 3. Copy the desired `result_id` 4. Call `download_book` with that `resultId` The response includes the final saved path, filename, bytes written, and whether the file was opened automatically. ### 8. Use the compatibility workflow if you want one-call behavior AnnasArchiveMCP also provides `search_and_download_book`. This workflow: - searches first - returns results when manual selection is needed - or automatically downloads the top match when selection settings allow it Useful `selectionMode` values: - `manual` — always return choices for you to inspect - `auto_if_confident` — auto-download only when the top match is strong enough - `force_top` — always pick the top-ranked result This mode is convenient, but the separate `search_books` → `download_book` flow is usually easier to control. ### 9. Recommended everyday usage For the safest and most predictable experience, use this routine: 1. Start the MCP server through your MCP client 2. Call `search_books` with a clear query 3. Inspect title, author, year, language, format, and relevance 4. Choose the best `result_id` 5. Call `download_book` 6. Confirm the returned `destination_path` ### 10. Example real-world usage pattern If you want an EPUB copy of a book: 1. Search for the title and author together 2. Pass `formats: ["epub"]` 3. Limit results to a small number such as `5` 4. Inspect the best matches 5. Download the result with the most accurate metadata If you get too few results, remove format or language filters and try again. ### 11. What to expect in responses `search_books` returns structured information such as: - a summary - the normalized query - a result count - ranked results - warnings when relevant `download_book` returns structured information such as: - selected result identifiers - title and authors - file format and MIME type - destination path - final filename - bytes written - warnings ### 12. Troubleshooting quick guide If the server does not start: - confirm `RAPIDAPI_KEY` is set - confirm your key has Anna's Archive API access - confirm your MCP client points to the correct binary path If searching returns nothing useful: - broaden the query - remove some filters - verify the upstream API is available If downloading fails: - check destination directory permissions - check available disk space - verify the selected result is downloadable - retry later if the upstream service is unavailable or rate-limited ### 13. Security tips - Do not hardcode API keys in source code - Prefer environment variables or MCP client secret storage - Do not commit `.env` files containing real secrets ## Features - MCP stdio server implemented in Rust - Normalized search results with stable `result_id` values - Separate tools for search and download - Compatibility `search_and_download_book` workflow - Safer path handling and filename generation - Ranked result selection with manual and auto-selection modes - Optional open-after-download behavior - Structured JSON responses for MCP clients ## Requirements - Rust 1.78+ recommended - Cargo - A RapidAPI key with access to the Anna's Archive API ## Installation Clone the repository and build it: ```sh git clone <your-repo-url> cd AnnasArchiveMCP cargo build --release ``` The server binary will be available at: ```sh target/release/annas-archive-mcp ``` ## Configuration AnnasArchiveMCP reads configuration from environment variables and optionally from a local `.env` file. ### Required - `RAPIDAPI_KEY` — your RapidAPI API key ### Optional - `RAPIDAPI_HOST` — defaults to `annas-archive-api.p.rapidapi.com` - `ANNAS_ARCHIVE_MCP_DEFAULT_PROVIDER` — defaults to `annas_archive` - `ANNAS_ARCHIVE_MCP_DOWNLOAD_DIR` — default download directory - `ANNAS_ARCHIVE_MCP_OPEN_AFTER_DOWNLOAD` — `true` or `false` - `ANNAS_ARCHIVE_MCP_CREATE_SUBDIRS` — `true` or `false` - `ANNAS_ARCHIVE_MCP_OVERWRITE_DEFAULT` — `true` or `false` - `ANNAS_ARCHIVE_MCP_FILENAME_TEMPLATE` — filename template string - `ANNAS_ARCHIVE_MCP_MAX_FILENAME_LENGTH` — max generated filename length - `ANNAS_ARCHIVE_MCP_DEFAULT_LIMIT` — default search result limit - `ANNAS_ARCHIVE_MCP_MAX_LIMIT` — max allowed search result limit - `ANNAS_ARCHIVE_MCP_ENABLE_DEBUG_FIELDS` — include provider debug fields by default - `ANNAS_ARCHIVE_MCP_TIMEOUT_SECS` — HTTP timeout - `ANNAS_ARCHIVE_MCP_MAX_RETRIES` — provider retry count - `ANNAS_ARCHIVE_MCP_USER_AGENT` — custom HTTP user agent - `RUST_LOG` — log level, for example `info` or `debug` ### Example `.env` ```env RAPIDAPI_KEY=your_api_key_here RAPIDAPI_HOST=annas-archive-api.p.rapidapi.com ANNAS_ARCHIVE_MCP_DOWNLOAD_DIR=~/Downloads ANNAS_ARCHIVE_MCP_OPEN_AFTER_DOWNLOAD=false ANNAS_ARCHIVE_MCP_CREATE_SUBDIRS=true ANNAS_ARCHIVE_MCP_OVERWRITE_DEFAULT=false ANNAS_ARCHIVE_MCP_DEFAULT_LIMIT=10 ANNAS_ARCHIVE_MCP_MAX_LIMIT=50 RUST_LOG=info ``` ## Running the server Run directly with Cargo: ```sh cargo run ``` Or run the release binary: ```sh ./target/release/annas-archive-mcp ``` The server communicates over stdio and is intended to be launched by an MCP client. ## MCP client configuration Example command-based MCP configuration: ```json { "mcpServers": { "annas-archive": { "command": "/absolute/path/to/AnnasArchiveMCP/target/release/annas-archive-mcp", "env": { "RAPIDAPI_KEY": "your_api_key_here", "RUST_LOG": "info" } } } } ``` Adjust the path for your machine and MCP client. ## Available tools ### `search_books` Searches for books and returns ranked normalized results. #### Arguments - `query` (required): free-text search query - `formats`: array of preferred formats like `pdf`, `epub`, `mobi` - `categories`: array like `fiction`, `nonfiction` - `languages`: array of language codes or labels - `yearFrom`: lower year bound - `yearTo`: upper year bound - `limit`: maximum results to return - `provider`: provider hint, currently `annas_archive` - `sort`: `relevance`, `year`, or `size` - `debug`: include ranking/debug metadata #### Returns Structured content including: - `summary` - `query` - `count` - `results` - `warnings` Each result includes fields such as: - `result_id` - `provider` - `provider_item_id` - `title` - `subtitle` - `authors` - `publisher` - `year` - `language` - `format` - `file_size_bytes` - `cover_url` - `checksum_md5` - `checksum_sha1` - `downloadable` - `relevance_score` ### `download_book` Downloads a specific result using either `resultId` or `providerItemId`. #### Arguments - `resultId`: stable result id returned from `search_books` - `providerItemId`: provider-native identifier - `downloadDir`: override destination directory - `filenameTemplate`: override filename template - `overwrite`: overwrite existing files - `openAfterDownload`: open the file after download - `createSubdirs`: create destination directory if needed You must provide either `resultId` or `providerItemId`. #### Returns Structured content including: - `summary` - `result_id` - `provider` - `provider_item_id` - `title` - `authors` - `format` - `mime_type` - `destination_path` - `final_file_name` - `bytes_written` - `opened` - `warnings` ### `search_and_download_book` Compatibility workflow that searches first, then either: - returns matching results if manual selection is required, or - auto-selects a result and downloads it #### Arguments Includes all major search and download fields plus: - `selectionMode`: one of - `manual` - `auto_if_confident` - `force_top` ## Typical workflow ### Recommended flow 1. Call `search_books` 2. Inspect results 3. Choose a `result_id` 4. Call `download_book` ### Compatibility flow 1. Call `search_and_download_book` 2. If `selection_required` is `true`, call `download_book` with a chosen `resultId` 3. Otherwise use the returned download result ## Behavior notes - Automatic file opening is opt-in - Downloads are written using safer filename/path handling - Result ranking attempts to prefer better title/author/format matches - The provider currently supported is Anna's Archive through RapidAPI - If your API key is missing, startup will fail with a configuration error ## Development Build: ```sh cargo build ``` Run tests: ```sh cargo test ``` Run with debug logging: ```sh RUST_LOG=debug cargo run ``` Format and lint: ```sh cargo fmt cargo clippy --all-targets --all-features ``` ## Troubleshooting ### Server fails to start Check that: - `RAPIDAPI_KEY` is set - your key has access to the Anna's Archive API - the binary path in your MCP client config is correct ### No results returned Try: - a broader query - removing restrictive filters - verifying the upstream API is reachable ### Download fails Check: - destination directory permissions - available disk space - whether the provider result is actually downloadable - whether the upstream API is rate-limiting or unavailable ## Security notes - Do not hardcode API keys in source files - Prefer environment variables or MCP client-managed secrets - Review your MCP client config so secrets are not committed to version control ## Project status This project is a Rust rewrite focused on a cleaner MCP architecture, safer downloads, and better maintainability than the legacy implementation.