Testing Handbook Generator
Trail of BitsOfficialPublished by Trail of Bits
- Skill
- Workflow
- Agent tooling
- CC-BY-SA-4.0
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AutoGineer summary
Written by AutoGineer from the skill’s own files, not by the author
The testing-handbook-generator is a workflow-based skill designed to transform content from the Trail of Bits Testing Handbook into structured Claude Code skills. It follows a multi-phase process that includes handbook discovery, planning, two-pass content generation, and validation. The skill ensures that generated documentation adheres to specific templates based on the handbook section type, such as tools, fuzzers, techniques, or domains. It also manages cross-references between generated skills and updates repository documentation to maintain consistency.
What it does
- Analyzes the Trail of Bits Testing Handbook to identify potential skills.
- Generates structured SKILL.md files using predefined templates.
- Executes a two-pass generation process to handle cross-references between skills.
- Validates generated skills and their cross-references using automated scripts.
- Updates the repository README and cross-reference graphs.
- Supports regeneration of individual skills from specific handbook sections.
When to use it
- When you need to create new security testing skills derived from the appsec.guide handbook.
- When you need to refresh existing skills based on updates to the handbook content.
- When you are performing bulk skill generation or maintenance within the plugin structure.
- When a user explicitly references the testing handbook or appsec.guide.
Advantages
- Ensures consistent structure across all generated security skills.
- Automates the complex task of managing inter-skill dependencies.
- Provides a clear workflow for validating and integrating new skills into the repository.
- Reduces manual effort in maintaining documentation and cross-references.
Usage examples
- “Generate skills from the testing handbook”
- The agent initiates the discovery phase, scans the handbook, presents a generation plan for approval, and proceeds to create the skills.
- “Create a skill for the libFuzzer section”
- The agent reads the specific libFuzzer handbook section, applies the fuzzer-skill template, and generates the corresponding SKILL.md file.
- “Regenerate the semgrep skill from the handbook”
- The agent re-reads the relevant handbook section, overwrites the existing semgrep SKILL.md, and updates cross-references.
Install
Download the skill as a ZIP:
https://autogineer.com/agent-skills/trailofbits/testing-handbook-generator/downloadUnzip it into the cross-client skills folder of your project:
mkdir -p .agents/skills && unzip testing-handbook-generator.zip -d .agents/skills
Documentation by Trail of Bits
Testing Handbook Skill Generator
Generate and maintain Claude Code skills from the Trail of Bits Testing Handbook.
When to Use
Invoke this skill when:
Creating new security testing skills from handbook content
User mentions "testing handbook", "appsec.guide", or asks about generating skills
Bulk skill generation or refresh is needed
Do NOT use for:
General security testing questions (use the generated skills)
Non-handbook skill creation
Handbook Location
The skill needs the Testing Handbook repository. See discovery.md for full details.
Quick reference: Check ./testing-handbook, ../testing-handbook, ~/testing-handbook → ask user → clone as last resort.
Repository: https://github.com/trailofbits/testing-handbook
Workflow Overview
Phase 0: Setup Phase 1: Discovery
┌─────────────────┐ ┌─────────────────┐
│ Locate handbook │ → │ Analyze handbook│
│ - Find or clone │ │ - Scan sections │
│ - Confirm path │ │ - Classify types│
└─────────────────┘ └─────────────────┘
↓ ↓
Phase 3: Generation Phase 2: Planning
┌─────────────────┐ ┌─────────────────┐
│ TWO-PASS GEN │ ← │ Generate plan │
│ Pass 1: Content │ │ - New skills │
│ Pass 2: X-refs │ │ - Updates │
│ - Write to gen/ │ │ - Present user │
└─────────────────┘ └─────────────────┘
↓
Phase 4: Testing Phase 5: Finalize
┌─────────────────┐ ┌─────────────────┐
│ Validate skills │ → │ Post-generation │
│ - Run validator │ │ - Update README │
│ - Test activation│ │ - Update X-refs │
│ - Fix issues │ │ - Self-improve │
└─────────────────┘ └─────────────────┘Scope Restrictions
ONLY modify these locations:
plugins/testing-handbook-skills/skills/[skill-name]/*- Generated skills (as siblings to testing-handbook-generator)plugins/testing-handbook-skills/skills/testing-handbook-generator/*- Self-improvementRepository root
README.md- Add generated skills to table
NEVER modify or analyze:
Other plugins (
plugins/property-based-testing/,plugins/static-analysis/, etc.)Other skills outside this plugin
Do not scan or pull into context any skills outside of testing-handbook-skills/. Generate skills based solely on handbook content and resources referenced from it.
Quick Reference
Section → Skill Type Mapping
| Handbook Section | Skill Type | Template |
|---|---|---|
/static-analysis/[tool]/ | Tool Skill | tool-skill.md |
/fuzzing/[lang]/[fuzzer]/ | Fuzzer Skill | fuzzer-skill.md |
/fuzzing/techniques/ | Technique Skill | technique-skill.md |
/crypto/[tool]/ | Domain Skill | domain-skill.md |
/web/[tool]/ | Tool Skill | tool-skill.md |
Skill Candidate Signals
| Signal | Indicates |
|---|---|
_index.md with bookCollapseSection: true | Major tool/topic |
| Numbered files (00-, 10-, 20-) | Structured content |
techniques/ subsection | Methodology content |
99-resources.md or 91-resources.md | Has external links |
Exclusion Signals
| Signal | Action |
|---|---|
draft: true in frontmatter | Skip section |
| Empty directory | Skip section |
| Template/placeholder file | Skip section |
GUI-only tool (e.g., web/burp/) | Skip section (Claude cannot operate GUI tools) |
Decision Tree
Starting skill generation?
├─ Need to analyze handbook and build plan?
│ └─ Read: discovery.md
│ (Handbook analysis methodology, plan format)
│
├─ Spawning skill generation agents?
│ └─ Read: agent-prompt.md
│ (Full prompt template, variable reference, validation checklist)
│
├─ Generating a specific skill type?
│ └─ Read appropriate template:
│ ├─ Tool (Semgrep, CodeQL) → templates/tool-skill.md
│ ├─ Fuzzer (libFuzzer, AFL++) → templates/fuzzer-skill.md
│ ├─ Technique (harness, coverage) → templates/technique-skill.md
│ └─ Domain (crypto, web) → templates/domain-skill.md
│
├─ Validating generated skills?
│ └─ Run: scripts/validate-skills.py
│ Then read: testing.md for activation testing
│
├─ Finalizing after generation?
│ └─ See: Post-Generation Tasks below
│ (Update main README, update Skills Cross-Reference, self-improvement)
│
└─ Quick generation from specific section?
└─ Use Quick Reference above, apply template directlyTwo-Pass Generation (Phase 3)
Generation uses a two-pass approach to solve forward reference problems (skills referencing other skills that don't exist yet).
Pass 1: Content Generation (Parallel)
Generate all skills in parallel without the Related Skills section:
Pass 1 - Generating 5 skills in parallel:
├─ Agent 1: libfuzzer (fuzzer) → skills/libfuzzer/SKILL.md
├─ Agent 2: aflpp (fuzzer) → skills/aflpp/SKILL.md
├─ Agent 3: semgrep (tool) → skills/semgrep/SKILL.md
├─ Agent 4: harness-writing (technique) → skills/harness-writing/SKILL.md
└─ Agent 5: wycheproof (domain) → skills/wycheproof/SKILL.md
Each agent uses: pass=1 (content only, Related Skills left empty)Pass 1 agents:
Generate all sections EXCEPT Related Skills
Leave a placeholder:
## Related Skills\n\n<!-- PASS2: populate after all skills exist -->Output report includes
references: DEFERRED
Pass 2: Cross-Reference Population (Sequential)
After all Pass 1 agents complete, run Pass 2 to populate Related Skills:
Pass 2 - Populating cross-references:
├─ Read all generated skill names from skills/*/SKILL.md
├─ For each skill, determine related skills based on:
│ ├─ related_sections from discovery (handbook structure)
│ ├─ Skill type relationships (fuzzers → techniques)
│ └─ Explicit mentions in content
└─ Update each SKILL.md's Related Skills sectionPass 2 process:
Collect all generated skill names:
ls -d skills/*/SKILL.mdFor each skill, identify related skills using the mapping from discovery
Edit each SKILL.md to replace the placeholder with actual links
Validate cross-references exist (no broken links)
Agent Prompt Template
See agent-prompt.md for the full prompt template with:
Variable substitution reference (including
passvariable)Pre-write validation checklist
Hugo shortcode conversion rules
Line count splitting rules
Error handling guidance
Output report format
Collecting Results
After Pass 1: Aggregate output reports, verify all skills generated. After Pass 2: Run validator to check cross-references.
Handling Agent Failures
If an agent fails or produces invalid output:
| Failure Type | Detection | Recovery Action |
|---|---|---|
| Agent crashed | No output report | Re-run single agent with same inputs |
| Validation failed | Output report shows errors | Check gaps/warnings, manually patch or re-run |
| Wrong skill type | Content doesn't match template | Re-run with corrected type parameter |
| Missing content | Output report lists gaps | Accept if minor, or provide additional related_sections |
| Pass 2 broken ref | Validator shows missing skill | Check if skill was skipped, update reference |
Important: Do NOT re-run the entire parallel batch for a single agent failure. Fix individual failures independently.
Single-Skill Regeneration
To regenerate a single skill without re-running the entire batch:
# Regenerate single skill (Pass 1 - content only)
"Use testing-handbook-generator to regenerate the {skill-name} skill from section {section_path}"
# Example:
"Use testing-handbook-generator to regenerate the libfuzzer skill from section fuzzing/c-cpp/10-libfuzzer"Regeneration workflow:
Re-read the handbook section for fresh content
Apply the appropriate template
Write to
skills/{skill-name}/SKILL.md(overwrites existing)Re-run Pass 2 for that skill only to update cross-references
Run validator on the single skill:
uv run scripts/validate-skills.py --skill {skill-name}
Output Location
Generated skills are written to:
skills/[skill-name]/SKILL.mdEach skill gets its own directory for potential supporting files (as siblings to testing-handbook-generator).
Quality Checklist
Before delivering generated skills:
[ ] All handbook sections analyzed (Phase 1)
[ ] Plan presented to user before generation (Phase 2)
[ ] Parallel agents launched - one per skill (Phase 3)
[ ] Templates applied correctly per skill type
[ ] Validator passes:
uv run scripts/validate-skills.py[ ] Activation testing passed - see testing.md
[ ] Main
README.mdupdated with generated skills table[ ]
README.mdSkills Cross-Reference graph updated[ ] Self-improvement notes captured
[ ] User notified with summary
Post-Generation Tasks
1. Update Main README
After generating skills, update the repository's main README.md to list them.
Format: Add generated skills to the same "Available Plugins" table, directly after testing-handbook-skills. Use plain text testing-handbook-generator as the author (no link).
Example:
| Plugin | Description | Author |
|--------|-------------|--------|
| ... other plugins ... |
| [testing-handbook-skills](plugins/testing-handbook-skills/) | Meta-skill that generates skills from the Testing Handbook | Paweł Płatek |
| [libfuzzer](plugins/testing-handbook-skills/skills/libfuzzer/) | Coverage-guided fuzzing with libFuzzer for C/C++ | testing-handbook-generator |
| [aflpp](plugins/testing-handbook-skills/skills/aflpp/) | Multi-core fuzzing with AFL++ | testing-handbook-generator |
| [semgrep](plugins/testing-handbook-skills/skills/semgrep/) | Fast static analysis for finding bugs | testing-handbook-generator |2. Update Skills Cross-Reference
After generating skills, update the README.md's Skills Cross-Reference section with the mermaid graph showing skill relationships.
Process:
Read each generated skill's
SKILL.mdand extract its## Related SkillssectionBuild the mermaid graph with nodes grouped by skill type (Fuzzers, Techniques, Tools, Domain)
Add edges based on the Related Skills relationships:
Solid arrows (
-->) for primary technique dependenciesDashed arrows (
-.->) for alternative tool suggestions
Replace the existing mermaid code block in README.md
Edge classification:
| Relationship | Arrow Style | Example |
|---|---|---|
| Fuzzer → Technique | --> | libfuzzer --> harness-writing |
| Tool → Tool (alternative) | -.-> | semgrep -.-> codeql |
| Fuzzer → Fuzzer (alternative) | -.-> | libfuzzer -.-> aflpp |
| Technique → Technique | --> | harness-writing --> coverage-analysis |
Validation: After updating, run validate-skills.py to verify all referenced skills exist.
3. Self-Improvement
After each generation run, reflect on what could improve future runs.
Capture improvements to:
Templates (missing sections, better structure)
Discovery logic (missed patterns, false positives)
Content extraction (shortcodes not handled, formatting issues)
Update process:
Note issues encountered during generation
Identify patterns that caused problems
Update relevant files:
SKILL.md- Workflow, decision tree, quick reference updatestemplates/*.md- Template improvementsdiscovery.md- Detection logic updatestesting.md- New validation checks
Document the improvement in commit message
Example self-improvement:
Issue: libFuzzer skill missing sanitizer flags table
Fix: Updated templates/fuzzer-skill.md to include ## Compiler Flags sectionExample Usage
Full Discovery and Generation
User: "Generate skills from the testing handbook"
1. Locate handbook (check common locations, ask user, or clone)
2. Read discovery.md for methodology
3. Scan handbook at {handbook_path}/content/docs/
4. Build candidate list with types
5. Present plan to user
6. On approval, generate each skill using appropriate template
7. Validate generated skills
8. Update main README.md with generated skills table
9. Update README.md Skills Cross-Reference graph from Related Skills sections
10. Self-improve: note any template/discovery issues for future runs
11. Report resultsSingle Section Generation
User: "Create a skill for the libFuzzer section"
1. Read /testing-handbook/content/docs/fuzzing/c-cpp/10-libfuzzer/
2. Identify type: Fuzzer Skill
3. Read templates/fuzzer-skill.md
4. Extract content, apply template
5. Write to skills/libfuzzer/SKILL.md
6. Validate and reportTips
Do:
Always present plan before generating
Use appropriate template for skill type
Preserve code blocks exactly
Validate after generation
Don't:
Generate without user approval
Skip fetching non-video external resources (use WebFetch)
Fetch video URLs (YouTube, Vimeo - titles only)
Include handbook images directly
Skip validation step
Exceed 500 lines per SKILL.md
For first-time use: Start with discovery.md to understand the handbook analysis process.
For template reference: See templates/ directory for skill type templates.
For validation: See testing.md for quality assurance methodology.
Files
- ATTRIBUTION.mdAdded by AutoGineer969 B
- LICENSELicence file added by AutoGineer19.7 KiB
- SKILL.md14.3 KiB
- agent-prompt.md11.2 KiB
- agents/openai.yaml256 B
- assets/trail-of-bits-mark.svg3.0 KiB
- discovery.md15.4 KiB
- templates/domain-skill.md16.6 KiB
- templates/fuzzer-skill.md11.1 KiB
- templates/technique-skill.md12.3 KiB
- templates/tool-skill.md9.2 KiB
- testing.md16.3 KiB
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Requirements and compatibility
Written for: Claude Code
Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta
“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.
Needs: Names Claude Code tools, Needs Python
Security
No issues found by our static scan· No issues found
A static scan is not a guarantee. Skills are third-party content: review a skill before you let an agent use it.
Attribution and licence
- Published by
- Trail of Bits
- Publisher
- Trail of Bits (Official)
- Source
- trailofbits/skills · plugins/testing-handbook-skills/skills/testing-handbook-generator · commit e4dd0bb
- Licence
- Creative Commons Attribution-ShareAlike 4.0 International (redistribution allowed)
- LICENSE (added by AutoGineer from LICENSE)
- ATTRIBUTION.md (written by AutoGineer)
- Synced
AutoGineer is not affiliated with or endorsed by Trail of Bits or Trail of Bits.
Download ZIP
The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download testing-handbook-generator.zip