Agent Builder Skill | Agent Skills

Agent Builder

Takes a spec from Process Analyst and implements the agent: code, skill, config, launchd.

When to use

After Process Analyst has created a spec
"build an agent for process X"
"implement spec Y"

Input

Spec file from $AGENTS_PATH/specs/[name].spec.md

How to execute

Step 1: Read the spec

Read the spec file completely
Read the reference implementation: Email Pipeline ($GOOGLE_TOOLS_PATH/email_agent.py)
Understand the pipeline: trigger → steps → output

Step 2: Define architecture

Based on the spec, define:

agents/[name]/
├── [name]_agent.py        ← Main agent script
├── config.json            ← Configuration (paths, params)
├── README.md              ← Documentation
└── test_[name].py         ← Tests

Build rules:

One file = one step (if step is complex) or one file = entire pipeline (if simple)
Claude CLI for AI — use claude -p --model [model] instead of API key
CSV for data — read/write via pandas or csv module
Git auto-commit — if agent modifies CRM/PM data
Telegram notification — if human approval is needed
Dry-run mode — mandatory --dry-run flag
Logging — stdout for launchd, file for debug
Idempotency — re-run must not duplicate data

Step 3: Build

For each step from the spec:

Write the function/script
Handle errors according to the spec
Add logging
Add dry-run branch

Step 4: Create skill

Create skill file skills/agents/[name]-run.md with instructions on how to run the agent manually.

Step 5: Create launchd plist (if scheduled)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "...">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>com.yourcompany.[name]-agent</string>
    <key>ProgramArguments</key>
    <array>
        <string>/usr/bin/python3</string>
        <string>$AGENTS_PATH/[name]/[name]_agent.py</string>
    </array>
    <key>StartInterval</key>
    <integer>[seconds]</integer>
    <key>StandardOutPath</key>
    <string>/tmp/[name]-agent.log</string>
    <key>StandardErrorPath</key>
    <string>/tmp/[name]-agent-error.log</string>
</dict>
</plist>

Step 6: Hand off to Agent Tester

Notify that the agent is ready for testing.

Output

Agent code in $AGENTS_PATH/[name]/
Skill file in $SKILLS_PATH/skills/agents/
Launchd plist (if scheduled)

Examples

Reference: Email Pipeline

google-tools/
├── email_monitor.py        ← Step 1: Gmail API check
├── email_agent.py          ← Step 2: AI classify (haiku)
├── email_action_agent.py   ← Step 3: CRM match + log
└── data/
    ├── email_summaries/    ← Output: summaries
    └── email_drafts/       ← Output: draft replies

Trigger: launchd every 3600s Model: Claude haiku (classification) Output: CRM activities + PM tasks + drafts + Telegram notify

Related skills

process-analyst — creates the spec
agent-tester — tests the agent
git-workflow — commit and PR

Agent Skills: Agent Builder

Install this agent skill to your local

Skill Files