vex MCP server

Vex

Fast hybrid structural + semantic code search. Vector + index.

Why Vex? · How It Compares · Installation · Quick Start · Commands · Configuration · How Search Works · Benchmarks · Supported Languages · Integration · Testing · Architecture

$ vex check "TelemetryProcessor"           # 4ms — does it exist? where? (exact name)
$ vex show "TelemetryProcessor"            # extract the class body (not the whole file)
$ vex usages "Config" --strict             # who references this symbol? (binder-resolved, no noise)
$ vex callers "process_event"              # who calls this function? (~4ms; covers module-scope + Python/Java decorators)
$ vex implementations "BaseService"        # who extends/implements this?
$ vex search "timeout retry"               # fuzzy / multi-word — BM25 finds rare body terms
$ vex search "handle alert" --semantic     # find by meaning, not just name
$ vex pattern 'fn $NAME($$$) -> Result' --lang rust    # AST pattern matching (like ast-grep)
$ vex similar "PaymentService"             # semantically close symbols
$ vex duplicates --threshold 0.95          # near-duplicate pairs
$ vex bundle --mode symbol --symbol Foo    # body + callers + callees + similar in 1 call

Pick the right tool: vex check for "does Foo exist?", vex search for "find me something about retries". search is a ranked blend — it surfaces neighbors (callers / imports) when no symbol literally matches, which is great for exploration and wrong for exact-name lookup. v1.15.0 prints a stderr hint when an identifier-shaped search returns 0 FST hits.

Why Vex?

Shortened. The full README is on GitHub.