Trailmark skill: what it does and how to install it

What it does. Builds directed graphs of code units, calls, types, entrypoints and SQL objects, then queries paths, callers, callees, reachability, complexity and attack surface. Pre-analysis adds blast-radius, privilege-boundary and coarse taint annotations, with optional SARIF, binary, weAudit and declared cross-language link augmentation.

When to use it. For security review of multi-language repositories, attack-surface mapping, audit prioritisation and tracing call paths. It does not replace direct reading for trivial single-file scripts, runtime analysis or mutation-testing triage.