Diagramming Code
Generates Mermaid diagrams from Trailmark code graphs.
Install
npx skills add trailofbits/skills --skill diagramming-code -g -a claude-code -y- Repository
- trailofbits/skills7.9k
- Category
- Engineering
- Updated
- 7d ago
- License
- CC-BY-SA-4.0
- Context cost
- Mediumabout 1,573 tokens
- Runs scripts
- Yes, review before use
What it does
Generates Mermaid diagrams from Trailmark code graphs. Produces call graphs, class hierarchies, module dependency maps, containment diagrams, complexity heatmaps, and attack surface data flow visualizations. Use when visualizing code architecture, drawing call graphs, generating class diagrams, creating dependency maps, producing complexity heatmaps, or visualizing data flow and attack surface paths as Mermaid diagrams.
Diagramming Code
Generates Mermaid diagrams from Trailmark's code graph. A pre-made script
handles Mermaid syntax generation; Claude selects the diagram type and
parameters. Trailmark 0.4.0 includes a native trailmark diagram command; use
it only after a version/command check, otherwise use this skill's bundled
script.
When to Use
- Visualizing call paths between functions
- Drawing class inheritance hierarchies
- Mapping module import dependencies
- Showing class structure with members
- Highlighting complexity hotspots with color coding
- Tracing data flow from entrypoints to sensitive functions
When NOT to Use
- Querying the graph without visualization (use the
trailmarkskill) - Mutation testing triage (use the
genotoxicskill) - Architecture diagrams not derived from code (draw by hand)
Prerequisites
trailmark must be installed. If uv run trailmark fails, run:
uv tool install trailmark
# Python snippets: uv run --with trailmark python - (a tool env is not importable)
DO NOT fall back to hand-writing Mermaid from source code reading. The script uses Trailmark's parsed graph for accuracy. If installation fails, report the error to the user.
Version Gate
Check whether native v0.4 diagram support exists:
trailmark diagram --help 2>/dev/null || uv run trailmark diagram --help 2>/dev/null
If this succeeds, you may use trailmark diagram. If it fails, use
uv run {baseDir}/scripts/diagram.py, which keeps the older skill workflow
intact. Do not assume the native CLI exists on Trailmark 0.2.x.
Quick Start
uv run {baseDir}/scripts/diagram.py \
--target {targetDir} --language auto --type call-graph \
--focus <function> --depth 2
# Trailmark 0.4.0+ equivalent after the Version Gate succeeds
uv run trailmark diagram \
--target {targetDir} --language auto --type call-graph \
--focus <function> --depth 2
Output is raw Mermaid text. Wrap in a fenced code block:
