Bifrost

Bifrost is Brokk’s open-source, Rust-based static-analysis toolbox for AI coding harnesses, editors, and large repositories. It parses unbuilt or partially broken codebases, including mixed-language workspaces, so tools can navigate code structure and relationships without relying on text search alone.

Interfaces

The same analysis engine is available through:

• The brokk-bifrost Rust crate
• An MCP server for coding agents
• An LSP server for editors
• A command-line interface
• A native Python client

Structural and semantic queries

Bifrost maps language-specific syntax into Rune IR, a normalized representation that supports portable structural queries. Semantic relationships such as usages, imports, declaration ownership, and type hierarchies are indexed or constructed on demand when a query requests them.

This Rune Query Language expression selects each indexed declaration that encloses a call to a function named audit:

(enclosing-decl
  (call :callee (name "audit")))

RQL is the experimental, human-facing S-expression syntax used by Bifrost’s REPL. MCP clients use the canonical JSON representation of the same query model. The query documentation explains the boundary between structural matches and semantic traversal, while the language tutorials pair executable queries with exact results.

Maturity and language coverage

Bifrost is under active development. Its normalized query engine is at schema version 2; the RQL frontend remains explicitly experimental. Current analyzers cover C, C++, C#, Go, Java, JavaScript, PHP, Python, Ruby, Rust, Scala, and TypeScript.

Claims on this page follow the public project documentation so they remain straightforward to update as the supported surface changes.