Developer Toolbox

A collection of essential development workflow agents that integrate seamlessly with Claude Code.

What's Included

Agents (7)

Agent	Purpose	Triggers On
commit-helper	Generate conventional commit messages	"commit message", "staged changes"
build-verifier	Verify dist/ matches source after builds	"changes not appearing", "verify build"
code-reviewer	Security audits and code quality reviews	"code review", "security audit", "OWASP"
debugger	Systematic debugging with root cause analysis	"error", "TypeError", "stack trace", "bug"
test-runner	TDD workflow and test creation	"write tests", "TDD", "coverage", "jest"
orchestrator	Coordinate complex multi-step projects	"coordinate", "multi-step", "complex feature"
documentation-expert	README, API docs, architecture diagrams	"document", "README", "API docs"

Rules (1)

Rule	Purpose
agent-first-thinking	Behavioral interrupt - consider agents before manual work

Installation

# Via marketplace
/plugin install developer-toolbox

# Or local development
/plugin install ./skills/developer-toolbox

After installation, restart Claude Code to load the agents.

Usage Examples

Commit Helper

"Help me write a commit message for these staged changes"

Build Verifier

"My changes aren't appearing in production, verify the build output"

Code Reviewer

"Review this authentication code for security vulnerabilities"

Debugger

"I'm getting TypeError: Cannot read property 'map' of undefined"

Test Runner

"Use TDD to implement this user validation function"

Orchestrator

"Coordinate a refactor of the authentication system across 5 services"

Documentation Expert

"Create comprehensive API documentation for this REST endpoint"

Agent Design Philosophy

All agents follow the "MUST BE USED when" pattern for reliable auto-discovery:

description: |
  [Role] specialist. MUST BE USED when: [trigger 1], [trigger 2], [trigger 3].
  Use PROACTIVELY for [broad task category].

  Keywords: keyword1, keyword2, error-message-fragment

This ensures Claude Code discovers and proposes the right agent automatically based on user requests.

Agent-First Thinking Rule

The included agent-first-thinking.md rule encourages using agents by default:

The Inversion:

• Wrong: "I'll do this manually unless it's big enough for agents"
• Right: "I'll use agents unless there's a reason not to"

Triggers:

If about to...	Use instead...
grep/glob 3+ times	Explore agent
Read 5+ files	Explore agent
Same edit across files	Parallel agents
Audit multiple items	Parallel swarm

Customization

Each agent can be extended by editing its markdown file after installation:

# Find installed agents
ls ~/.claude/plugins/cache/*/developer-toolbox/*/agents/

# Or copy to user-level for customization
cp [plugin-path]/agents/code-reviewer.md ~/.claude/agents/

Combining Agents

Agents work well together:

"Review this code for security issues, then write tests for the critical paths"
# → code-reviewer first, then test-runner

"Debug this failing test, document the root cause, and commit the fix"
# → debugger → documentation-expert → commit-helper

Version History

• 1.0.0 (2025-01-20): Initial release with 7 agents and 1 rule