agent-creator

name: agent-creator description: "Scaffold vexjoy-agent operator .md files: frontmatter, routing block, operator context, reference loading table, phase/gate workflow." routing: triggers: - create agent - new agent - scaffold agent - agent template - build agent - agent design - make agent force_route: true not_for: "creating real estate agents, ML agents, OS agents (e.g. SNMP), travel agents, customer service agents — only for vexjoy-agent .md operator files" pairs_with: - skill-creator - agent-evaluation complexity: Medium category: meta allowed-tools:

• Read
• Edit
• Write
• Bash
• Glob
• Grep user_invocable: false

Agent Creator

Scaffold correctly-formed vexjoy-agent operator .md files. An agent file is a system-prompt contract: it sets identity, constraints, expertise, and routing — not application code.

Phases: DISCOVER → DESIGN → SCAFFOLD → REGISTER → VALIDATE

Phase 1 — DISCOVER

Check for domain overlap before creating anything.

grep -i "<domain-keyword>" agents/*.md | grep "^agents/" | cut -d: -f1 | sort -u
ls agents/ | grep "<domain-prefix>"

Gate 1: If an existing agent covers the domain, add a references/ file to that agent instead of creating a new one. Proceed only when no existing agent covers the domain, or the user confirms after seeing the overlap.

Read docs/PHILOSOPHY.md before proceeding — the philosophy governs operator context structure, progressive disclosure, positive framing, and tool restrictions. Components that violate it will fail CI.

Phase 2 — DESIGN

Decide the agent's identity and routing contract before writing a single line.

Load references/agent-design-patterns.md for operator context structure, hook design, routing design, authority/trust framing, and smells-to-rewrite guidance.

Load references/agent-eval-design.md when drafting the description and activation cases — the case classes and worked example live there.

Gate 2: All eight decisions answered before writing agent file content.

Phase 3 — SCAFFOLD

Write the agent file using the annotated template.

Load references/agent-frontmatter-template.md for the complete template with all required fields and valid values.

File layout:

agents/
├── {agent-name}.md          # operator file — the system prompt contract
└── {agent-name}/
    ├── references/
    │   └── *.md             # deep context, loaded on demand
    ├── SPEC.md              # optional: contract for complex/high-impact agents
    └── EVAL.md              # optional: repeatable eval cases

Writing the operator context (body after frontmatter):

1. Role statement: what the agent does, what domain it owns
2. Expertise list: concrete capabilities with specific sub-skills
3. Mandatory pre-action protocol: what to read before acting and why
4. Operator context block: hardcoded behaviors, default behaviors (ON), optional behaviors (OFF)
5. Capabilities and limitations table: CAN / CANNOT with agent suggestions for out-of-scope requests
6. Reference loading table: | Signal | Load These Files | Why | — required when a references/ directory exists
7. Workflow section: phase-by-phase with gates
8. Error handling: cause/solution pairs for common failures
9. Preferred patterns: what good looks like (positive framing)
10. Anti-rationalization table: common rationalizations with required action

Positive framing (CI gate): Every instruction tells the reader what to do. Run the check after writing:

python3 scripts/validate_positive_instruction_docs.py

Exit code 1 means violations. Rewrite flagged instructions in action form before proceeding.

Progressive disclosure: Main agent file stays navigable. Deep reference material goes in {agent-name}/references/ loaded on demand. If the file exceeds 600 lines, extract content to references/ first.

Gate 3: Agent file written, YAML frontmatter parses cleanly:

python3 -c "import yaml; yaml.safe_load(open('agents/{agent-name}.md').read().split('---')[1]); print('OK')"

Phase 4 — REGISTER

Add the agent to the routing index.

python3 scripts/generate-agent-index.py

Verify the count increased by exactly one:

python3 -c "
import json
d = json.load(open('agents/INDEX.json'))
agents = d.get('agents', [])
print(f'Registered agents: {len(agents)}')"

Gate 4: agents/INDEX.json contains the new agent entry. The router cannot discover unregistered agents.

Phase 5 — VALIDATE

Run all validation checks before declaring the agent shippable.

# Structural checks: filenames, frontmatter, line counts, loading tables
python3 scripts/validate-references.py --agent {agent-name}

# Positive framing gate (scans all tracked .md files)
python3 scripts/validate_positive_instruction_docs.py

# YAML parse
python3 -c "import yaml; yaml.safe_load(open('agents/{agent-name}.md').read().split('---')[1]); print('YAML OK')"

# Verify pairs_with entries exist on disk
python3 -c "
import yaml, os
txt = open('agents/{agent-name}.md').read()
fm = yaml.safe_load(txt.split('---')[1])
for p in fm.get('routing', {}).get('pairs_with', []):
    exists = os.path.exists(f'agents/{p}.md') or os.path.exists(f'skills/{p}/SKILL.md')
    print(f'  {p}: {\"OK\" if exists else \"MISSING\"}')"

Gate 5: All scripts exit 0. No phantom pairs_with entries. No positive-framing violations.

Manual review (the scripts cannot check these):

• Description craft: read the description aloud. Does it state intent, name 2–3 adjacent terms, mark one false-positive boundary? See references/agent-frontmatter-template.md Description Craft.
• Activation cases recorded: confirm agents/{name}/references/activation-cases.md (or equivalent notes section) lists 3 should-trigger / 2 should-not-trigger / 2 near-miss phrases. Mental-pass each phrase against the description. See references/agent-eval-design.md.

Error Handling

YAML parse error on frontmatter

Cause: Unquoted colon in description, or bad indentation in routing block. Solution: Wrap description in double quotes. Run the YAML parse command above — the traceback pinpoints the line.

Trigger conflict with existing agent

Cause: Two agents claim the same trigger phrase. Solution: Run the duplicate detection script in agents/toolkit-governance-engineer/references/routing-table-patterns.md. Make this agent's trigger more specific.

Agent not appearing in routing after INDEX regeneration

Cause: Agent file path not matching the expected pattern, or frontmatter missing routing.triggers. Solution: Confirm file is at agents/{name}.md. Confirm routing.triggers is a non-empty list.

Reference loading table missing from validation

Cause: Agent body has no | Signal | Load These Files | Why | table. Solution: Add a reference loading table with at least one row. See references/agent-design-patterns.md for the required format.

Preferred Patterns

Role-matched allowed-tools

Set allowed-tools to match what the agent actually does — reviewers read only, engineers write, orchestrators dispatch. This ensures agents stay within their domain and cannot make out-of-scope changes.

Triggers that match natural speech

Write triggers as phrases a first-time user would naturally say, not internal system identifiers. "fix a bug in Go" routes better than "golang-debugging-invocation".

Reference loading table as required section

Every agent that has a references/ directory includes a loading table mapping signals to files. Agents without this table load references eagerly, violating the progressive disclosure principle from docs/PHILOSOPHY.md.

Expertise list over motivational framing

List concrete capabilities the agent has: version-specific idiom tables, failure mode catalogs, concrete commands. Skip "you are an expert in X" — it adds no information the model will act on.

Reference Loading Table