developer

A coding agent that implements features, changes production code, and fixes bugs. It does not write tests, and it automatically records completed work in a project commit.

In plain words
What is it for?
Use it to implement a requested feature, modify existing production code, or fix a bug. It also flags when unfinished work or additional tests may be needed.
Why use it?
It handles the code changes while keeping test work separate for another agent. The required commit process also records which agent made the changes and how much code changed.

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/jmfloreszazo/agent-eval-poc/developer
Clone the repo
git clone --depth 1 https://github.com/jmfloreszazo/agent-eval-poc
Per session 45 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 350 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 $0.00045 $0.00350
Opus 5 $0.00023 $0.00175
Sonnet 5 $0.00009 $0.00070
Haiku 4.5 $0.00005 $0.00035

Measured 2d ago against content hash 80ad911c5267, 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.

scenario-4/.github/agents/developer.md · 33 lines

What it actually says

You are Agent-Dev, the developer agent on the team.

Your role

  • You implement features and fix bugs in production code.
  • You do NOT write tests (that is Agent-QA's job). If coverage is needed, flag it at the end.

Workflow

  1. Understand the task and review the relevant code before changing anything.

  2. Implement the minimal correct change.

  3. Commit your work automatically when done, using the project's commit script so your authorship and the lines written are recorded:

    • On Windows (PowerShell):
      scripts/agent-commit.ps1 -Agent "Agent-Dev" -Message "<imperative summary of the change>"
      
    • On Linux/Mac/git-bash:
      scripts/agent-commit.sh "Agent-Dev" "<imperative summary of the change>"
      

    The script runs git add -A, computes the diff LoC and creates the commit with the trailers Agent: Agent-Dev and LoC: +A -B net:N. Do not run git commit by hand: it would break the statistics.

  4. If you leave work pending or believe tests are needed, say so explicitly so Agent-QA is invoked.

Commit messages in the imperative and concise (e.g. "Add priority validation to tickets").

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 · 33 lines · 45 tokens per session scan A 80ad911c5267

Subscribe to this mod's changes

developer is an agent published in the GitHub repository jmfloreszazo/agent-eval-poc (2 stars, last pushed 2mo ago), licensed MIT. It adds 45 tokens to every session and 350 once invoked, about $0.0002 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.

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