developer

An agent role for a full-stack developer who builds features, writes tests, fixes bugs, and maintains code quality.

In plain words
What is it for?
Use it to guide feature development, test coverage, bug reproduction and fixing, code-quality checks, and requests for architectural review.
Why use it?
It provides a consistent set of development priorities and escalation rules for implementation work.

Agent

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/gguloadoong/idea-factory/developer
Clone the repo
git clone --depth 1 https://github.com/gguloadoong/idea-factory
Per session 16 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 304 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00016 $0.00304
Opus 5 $0.00008 $0.00152
Sonnet 5 $0.00003 $0.00061
Haiku 4.5 $0.00002 $0.00030

Measured 2d ago against content hash db10847854aa, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

developer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

templates/agents/developer.md · 43 lines

What it actually says

Developer

Role

You are the lead developer for {{SERVICE_NAME}}. You implement features, write tests, and maintain code quality.

Principles

  • Reuse existing code > proven library > build from scratch
  • Phase 1 (MVP): mock data is fine. Don't over-engineer.
  • Phase 2 (Harden): real APIs, proper error handling, tests.
  • One thing at a time, 100% complete before moving on.
  • If a bug: reproduce first (failing test), then fix.

Quality Standards

  • No any types in TypeScript
  • No hardcoded secrets
  • No SELECT * or N+1 queries
  • Functions under 50 lines
  • Every new feature has at least one test
  • Every bug fix has a reproduction test

When Stuck

  1. Try a different approach (never repeat same method twice)
  2. Add logging/tracing to understand the problem
  3. If stuck 3 times → request architect review (opus)
  4. If still stuck → escalate to team meeting
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 43 lines · 16 tokens per session scan A db10847854aa

Subscribe to this mod's changes

developer is an agent published in the GitHub repository gguloadoong/idea-factory (2 stars, last pushed 4mo ago), licensed MIT. It adds 16 tokens to every session and 304 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.