AgentFlow Framework Development

When to Use This Skill

Load this skill when you need to:

• Create or modify agents, skills, commands, or hooks
• Add or modify modules in the module registry
• Create integration guides for cross-module concerns
• Create or update module validation specs
• Understand framework component structure and V2 architecture
• Apply namespace rules and documentation standards

Rules (FOLLOW THESE)

Namespace Rules

1. All framework components use af- prefix (agents, skills, commands)
2. Project-specific components never use af- prefix
3. Never mix framework and project components in same file

Documentation Rules

4. All framework files require complete frontmatter (title, created, updated, tags, parent)
5. Bidirectional linking is mandatory - parent lists children, child references parent
6. Run docs-quality-agent after any framework changes
7. Update dates when modifying files (updated, last_checked)

Size Rules

8. Agents must be lightweight (~50 lines of procedure)
9. Skills must be directive (rules + workflows, not reference dumps)
10. Skills must be under 300 lines (target: 150-200)
11. Skills link to comprehensive docs for depth

Structure Rules

12. Agents reference skills for domain knowledge (use backticks: af-skill-name)
13. Agents have clear I/O specifications (inputs, outputs)
14. Skills use MUST/SHOULD/MAY directives for clarity
15. Commands validate arguments and provide usage examples

Validation Rules

16. Test components before considering them complete
17. Validate documentation with scripts (frontmatter, links)
18. Restart Claude Code after creating new skills
19. Verify invocation for agents and commands

Module Rules

20. All modules are declared in docs/reference/module-registry.yml
21. Core modules are always installed (agentflow, linear, git, documentation, doppler)
22. Optional modules are selected during Discovery and installed before Refinement
23. Every module must have: name, description, skill, validation_spec, depends_on
24. Integration guides are created when two modules interact (e.g., cognito + SES)
25. Validation specs are Playwright tests in templates/setup/validation/specs/
26. Run validate-module-registry.ts after any registry change (169+ checks)

Workflows

Workflow: Adding a New Agent

When: You need a specialized subagent for a specific domain

Steps:

1. Create file: .claude/agents/af-<domain>-agent.md
2. Add frontmatter with name, description, tools, title, dates, tags, parent
3. Write procedure: Role, Skills Used, Inputs, Procedure, Outputs, Error Handling
4. Keep procedure ~50 lines (load skills, don't duplicate knowledge)
5. Update .claude/agents/README.md children array
6. Validate: npx ts-node .claude/scripts/validate-frontmatter.ts
7. Test invocation: Task tool → subagent_type="af-<domain>-agent"
8. Run docs-quality-agent for comprehensive validation

Success criteria:

• ✅ Agent has complete frontmatter and bidirectional links
• ✅ Agent loads skills for domain knowledge
• ✅ Agent can be invoked successfully
• ✅ Validation scripts pass

Workflow: Creating a New Skill

When: You need to package domain knowledge for reuse

Steps:

1. Create directory: .claude/skills/af-<name>/
2. Create file: .claude/skills/af-<name>/SKILL.md
3. Add frontmatter with name, description, type, domain, dates, tags
4. Structure content: When to Use, Rules (15-20), Workflows (4-5), Examples, Essential Reading
5. Keep under 300 lines (target: 150-200) - move details to comprehensive guide
6. Create guide if needed: .claude/docs/guides/<domain>-guide.md (800-1500 lines)
7. Update .claude/skills/README.md children array
8. Validate: npx ts-node .claude/scripts/validate-links.ts
9. Restart Claude Code session to pick up new skill
10. Test with agent that loads the skill

Success criteria:

• ✅ Skill is directive (workflows, rules, examples)
• ✅ Skill is under 300 lines
• ✅ Skill links to comprehensive docs (if needed)
• ✅ Agents can load and use skill successfully

Workflow: Adding a Slash Command

When: You need a discoverable entry point for a workflow

Steps:

1. Determine category: framework (/af:), task (/task:), phase-specific
2. Create file: .claude/commands/<category>/<action>.md
3. Add frontmatter with description (shows in autocomplete), dates, tags
4. Write command body: usage, examples, the prompt that executes
5. Use $1, $2 for positional args or $ARGUMENTS for all args
6. Update .claude/commands/<category>/README.md children array
7. Test: /<category>:<action> should autocomplete and execute
8. Verify arguments work correctly

Success criteria:

• ✅ Command appears in autocomplete
• ✅ Command expands and executes correctly
• ✅ Arguments are handled properly
• ✅ Listed in category README

Workflow: Configuring a Hook

When: You need automated behavior on specific events

Steps:

1. Identify trigger: PreToolUse, PostToolUse, Stop, SubagentStop
2. Create script (if command type): .claude/hooks/<name>.sh
3. Write hook logic using hook variables ($TOOL_NAME, $ARGUMENTS, etc.)
4. Configure in settings.json with matcher and hook type
5. Test hook fires on correct event
6. Verify output is clear and helpful
7. Document in .claude/hooks/README.md

Success criteria:

• ✅ Hook fires on correct event
• ✅ Hook provides clear feedback
• ✅ Hook doesn't cause unintended side effects
• ✅ Hook is documented

Workflow: Adding a New Module

When: A new technology/concern needs to be installable via the setup process

Steps:

1. Choose the right category section in docs/reference/module-registry.yml
2. Add the module entry with all required fields:
   yamlCopy

   - name: my-module
     description: One-line description of what this module provides
     skill: af-relevant-expertise     # Existing skill for this domain
     guide: guides/path/to-guide.md   # Setup guide (optional for simple modules)
     validation_spec: my-module.spec.ts
     depends_on:
       - git                          # List dependencies
     integrations:                    # Cross-module integration guides (optional)
       - when: [my-module, other-module]
         guide: guides/integrations/my-other.md
   

3. Create validation spec: templates/setup/validation/specs/my-module.spec.ts
   • Follow existing spec patterns (check CLI tools, config files, project structure)
   • Use test.todo() for tests that need external services (never test.skip())
4. Add project entry to templates/setup/validation/playwright.config.ts
5. Update templates/setup/validation/package.json test scripts
6. Create integration guides if this module interacts with others (see next workflow)
7. Run validation: npx ts-node scripts/validation/validate-module-registry.ts
8. If adding a combination, add it under the combinations: section

Success criteria:

• Registry validation passes (all checks green)
• Validation spec exists and runs against a test project
• Dependencies are correctly declared
• Integration guides exist for all declared integrations

Workflow: Creating an Integration Guide

When: Two modules interact and need cross-cutting setup knowledge

Steps:

1. Create file: docs/guides/integrations/<module-a>-<module-b>.md
2. Add frontmatter (title, created, updated, tags, parent)
3. Structure content:
   • Problem: What goes wrong without this guide
   • Solution: Step-by-step configuration
   • Verification: How to confirm it works
4. Reference the guide in module-registry.yml under integrations:
   yamlCopy

   integrations:
     - when: [module-a, module-b]
       guide: guides/integrations/module-a-module-b.md
   

5. Update docs/guides/integrations/README.md children array
6. Run registry validation to confirm guide file exists

Success criteria:

• Guide explains the cross-cutting concern clearly
• Referenced in module-registry.yml under correct module(s)
• Listed in integrations README

Workflow: Creating a Module Validation Spec

When: A module needs a Playwright spec to verify its setup

Steps:

1. Create file: templates/setup/validation/specs/<module-name>.spec.ts
2. Import from @playwright/test and use test.describe('<module-name> module', ...)
3. Read PROJECT_ROOT from environment for file path assertions
4. Test categories:
   • CLI tools: Verify required CLIs are installed (which <tool>)
   • Config files: Verify required files exist in project
   • Project structure: Verify directories and conventions
   • External services: Verify accounts/configs (use test.todo() if fragile — never test.skip())
5. Add to playwright.config.ts:
   typescriptCopy

   { name: 'my-module', testMatch: 'specs/my-module.spec.ts' },
   

6. Add test script to package.json:
   jsonCopy

   "test:my-module": "npx playwright test --project=my-module"
   

7. Test against a real project: PROJECT_ROOT=/path/to/project npm run test:my-module

Success criteria:

• Spec runs and produces clear pass/fail results
• Core module specs always pass on any AgentFlow project
• Optional module specs pass only when that module is installed
• Graceful skips for tests requiring external services

Examples

Good Example: Lightweight Agent

## Procedure

1. **MUST load expertise skill**
   Load `af-bdd-expertise` skill for scenario patterns

2. **MUST read Linear issue**
   Extract requirements and acceptance criteria

3. **MUST transform to Markdown scenarios**
   Follow skill workflow: "Creating Scenarios from Refinement"
   Apply glossary compliance rules

4. **SHOULD validate output**
   Check coverage and test type classification

Why this is good:

• Agent is thin (~30 lines)
• Loads skill for domain knowledge
• Clear MUST/SHOULD directives
• References skill workflows

Bad Example: Heavy Agent

## Procedure

1. Understand scenario syntax:
   Preconditions: initial state
   Steps: user actions
   [200 lines of scenario reference...]

2. Check glossary for approved terms
   [100 lines explaining glossary...]

Why this is bad:

• Agent contains reference material (should be in skill)
• No skill loading
• Too verbose (~400 lines)
• Knowledge baked in instead of reusable

Good Example: Directive Skill

## Rules (FOLLOW THESE)
1. All test files must end in `.test.ts` or `.spec.ts`
2. Never mock internal code - only external dependencies
3. Tests must be independent (no shared state)

## Workflows
### Workflow: Writing Unit Tests from BDD
1. Read BDD scenario Given/When/Then
2. Create test file: `<feature>.test.ts`
3. Write describe block matching Feature name
4. Write it block for each Scenario
5. Implement Given (setup), When (action), Then (assertions)
6. Run tests: `npm test`

Why this is good:

• Rules up front
• Step-by-step workflow
• Actionable directives
• Under 200 lines

Bad Example: Reference-Heavy Skill

## Testing in TypeScript

TypeScript provides excellent support for testing...

[500 lines explaining testing concepts, frameworks, patterns...]

Jest is a popular choice because...
Mocha is another option...

Why this is bad:

• Reads like documentation, not directives
• No clear workflows
• Too long (500+ lines)
• Claude treats as "background reading" and may skip

Essential Reading

Comprehensive framework development guide:

• Framework Development Guide - Complete guide to creating agents, skills, commands, hooks (1700+ lines)

Module system:

• Module Registry - All modules, dependencies, integrations
• Integration Guides - Cross-module setup knowledge
• Validation Specs - Playwright module validation tests
• Registry Validator - 169+ automated checks

Architecture and standards:

• Documentation Standards - Frontmatter and linking requirements
• Framework Architecture - V2 architecture overview
• Project Structure - Where files go

Claude Code official docs:

• Skills - Official skills documentation
• Sub-agents - Official agents documentation
• Slash Commands - Official commands documentation
• Hooks - Official hooks documentation

Remember:

1. Framework components use af- prefix
2. Agents are lightweight, skills are directive
3. Comprehensive details go in guides
4. Always validate and test before considering complete
5. Run docs-quality-agent after framework changes
6. New modules need: registry entry, validation spec, playwright config, package.json script
7. Run validate-module-registry.ts after any registry changes