Glossary

The vocabulary you meet across these docs, defined once.

Fusion. One run of Fuse: it takes a source directory and produces a single output, either a file on disk or an in-memory payload returned to an MCP client. To "fuse" is to perform that run.

Token. The unit a language model reads; a model's context window is measured in tokens, so a fusion's token count decides how much of the window it consumes and what it costs.

Reduction. How Fuse shrinks content without changing what it means, ranging from removing comments and whitespace up to dropping method bodies. See Reduction levels.

Skeleton. A reduction that keeps class, interface, and method signatures and removes method bodies, producing an architecture map that is typically 66 to 93 percent smaller than a full fusion.

Scoping. Narrowing a fusion to the files relevant to a task (a type, a git change set, or a search query) and expanding through the dependency graph. See Scoping.

Seed. The starting file or files a scoping mode expands from before following dependency edges.

Manifest. The header prepended to every fusion that lists each included file with its token cost, so a reader or agent can judge the shape and cost before reading any body.

Template. A named set of defaults that tells Fuse which file extensions to collect and which directories to skip for a project type; fuse dotnet uses the DotNet template. See Templates.

Capability. One unit of language-specific behavior, such as reducing C#, extracting a skeleton, or detecting routes, resolved by file extension.

Round-trip. One read-decide cycle an agent makes while exploring; Fuse cuts round-trips by answering a survey, a drill-in, or a review in a single response.

Precision tier. The opt-in Roslyn analysis path that replaces the default regex extraction for higher-fidelity skeletons and dependency edges. See Precision tier.

Provenance. An annotation that records the inclusion chain that pulled a file into a scoped fusion, answering why a file is present.

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Return to How Fuse works, or look up exact detail in the Reference.