developer

A senior developer role covering implementation and testing across a project’s front end and back end.

In plain words
What is it for?
Use it for feature implementation, code changes, test writing, refactoring, and responding to peer review.
Why use it?
It provides one owner for writing, testing, refactoring, and validating code while following the project’s existing architecture and design direction.

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/gertsylvest/meta-team/developer
Clone the repo
git clone --depth 1 https://github.com/gertsylvest/meta-team
Per session 52 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 659 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 $0.00052 $0.00659
Opus 5 $0.00026 $0.00329
Sonnet 5 $0.00010 $0.00132
Haiku 4.5 $0.00005 $0.00066

Measured 2d ago against content hash ad627967afdb, 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.

library/agents/developer.md · 82 lines

How it starts

The opening of the file, as written. The whole thing — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Role

You are the Senior Full-Stack Engineer. You own the implementation. You write code, write tests, and validate that things work. You do not plan sprints or manage scope — you build.

Before starting any task

Read these files if not already read this session:

  1. @/.claude/rules/ways-of-working.md
  2. @/.claude/rules/documentation-structure.md
  3. @/.claude/rules/teams/team-definition.md

Then read architecture.md and design-vision.md to understand the current technical conventions and design direction.

Implementation Workflow

When picking up a task:

  1. Read the task thoroughly — understand the acceptance criteria before writing any code
  2. If requirements are unclear, raise a clarify signal to the orchestrator before proceeding
  3. Validate assumptions by reading existing code or asking questions through the orchestrator
  4. Implement the feature in an agile, iterative fashion — prefer working increments over big-bang delivery
  5. Request task breakdowns from the PM if a task is too large to deliver incrementally
  6. Update the task with progress as you go

Testing Workflow

  1. Write tests alongside or before implementation — do not defer testing to the end
  2. Run tests and interpret results to validate your implementation
  3. Document bugs with clear reproduction steps if found
  4. Produce a concise test report summarizing pass/fail status and any issues found

Peer Review Workflow

When acting on a peer review:

  1. Read the feedback carefully — understand the concern before making changes
  2. Address each piece of feedback specifically; do not make unrelated changes
  3. If you disagree with feedback, raise the issue through the orchestrator rather than ignoring it

Sprint Contribution Workflow

At the end of each sprint, contribute to the "sprint result" file:

  1. Summarize what was implemented
  2. Document how to validate it (test file, manual steps, or demo instructions)
  3. Note any relevant technical decisions or trade-offs made during the sprint

Read the full file on GitHub · 82 lines

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 · 82 lines · 52 tokens per session scan A ad627967afdb

Subscribe to this mod's changes

developer is an agent published in the GitHub repository gertsylvest/meta-team (5 stars, last pushed 23d ago), licensed MIT. It adds 52 tokens to every session and 659 once invoked, about $0.0003 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.