Scalable CTags

MCP server to allow for code navigation using a tags file. Aims to be able to handle largs tags files with minimal overhead.

Lars Hollenbachdb4e896232fix(server): register watcher with absolute path on manual load...

load_tags_file called o.watcher.Add(path) with the user-supplied path, which can be relative. fsnotify reports events for that file under a different key (the path the kernel gives back), so a relative-path load could silently drop watcher events.
Use the absolute path returned by ParseTagsFile (pf.Path), which the index and discovery layer already canonicalise to. Add tests covering both plain and non-canonical (./tags) relative inputs.
AI-Assisted: written with opencode and MiniMax-M3

A memory-mapped ctags symbol lookup server that exposes an MCP (Model Context Protocol) interface for IDE agents and LLM tooling. Designed to handle multiple and large ctags files across several subprojects.
- Multi-file support: Load and search across multiple tags files simultaneously

- Automatic Refresh: Watches loaded files, refreshes automatically

- Extended fields: Extractskind,language, andfilePathfrom ctags v2 extended format

Requires Go 1.26+ and a Nix environment (or standard Go toolchain).

Generate a tags file for your project before running the server:

The-nflag (--excmd=number) is required — it instructs ctags to store line numbers instead of regex patterns as search commands. Without it, the server returnsline: 0for all symbol lookups.

The server communicates via stdio (JSON-RPC).
On startup, the server automatically discoverstagsandtags.infiles from the current working directory (up to 8 levels deep) and parses them in a background goroutine pool — the MCP handshake answers immediately, no matter how large the tags files are. Lookup tools (lookup_symbol,get_symbol_info) block until the initial load completes;list_tags_filesanswers right away and reports per-filestatus(loading/ready) plus a top-levelloadingCompleteflag. Hidden directories (dot-prefixed) are always skipped. Use--auto-discover=falseto disable auto-discovery entirely.

By default additional directories matching the flag--skip-dirs(comma-separated dir names) are excluded (e.g.vendor,node_modules).

Add the server to youropencode.jsonunder themcpkey:

After editingopencode.json, quit and restart opencode for changes to take effect.

Theload_tags_fileresponse includes apreloadedfield set totruewhen the file was auto-discovered at startup.

Once the server is configured in opencode, you can ask natural language questions and the agent will use the tools:

The agent will calllist_tags_filesto check what is already loaded, then uselookup_symbolorget_symbol_infoto answer. For projects without a tags file on disk, it will callload_tags_filefirst.

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