feat: add MCP trace tools#176
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BartWaardenburg merged 2 commits intofallow-rs:mainfrom Apr 24, 2026
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`fallow dead-code --trace-dependency PACKAGE` and the MCP `trace_dependency` tool reported `is_used=false, import_count=0` for packages invoked only via package.json scripts (microbundle, vitest, eslint) and CI configs (.github/workflows/*.yml, .gitlab-ci.yml). The unused-deps detector already ignores those because it cross-references `script_used_packages` produced by the script analyzer; the trace path bypassed that data, so the two surfaces disagreed. An agent reading the trace would conclude the dep is safe to remove and break the build. Thread `script_used_packages` from `AnalysisOutput` through to `trace_dependency` and add `used_in_scripts: bool` to `DependencyTrace`. `is_used` is now `import_count > 0 || used_in_scripts`, matching the unused-deps detector's view. Human format adds a 'Referenced from package.json scripts or CI configs' footer when the flag is set; MCP tool description mentions the new field; rules doc updated. Verified end-to-end on benchmarks/fixtures/real-world/preact via MCP stdio: microbundle now reports `is_used=true, used_in_scripts=true`, mobx still `is_used=false`, preact (real import) still `is_used=true, import_count=191`. Surfaced during the post-merge dogfood of PR #176 / #177.
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cargo build -p fallow-cli -p fallow-mcpcargo test -p fallow-mcpcargo clippy -p fallow-mcp --tests -- -D warningscargo fmt --all -- --check