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aiagent: Agent for Claude Code

.claude/agents/developer.md

developer is an agent for Claude Code from drujensen/aiagent. It costs 63 tokens per session (1,207 once invoked), scanned A, original, MIT.

A full-stack Go development agent for the aiagent project. It implements an approved plan one step at a time, first checking the existing code and tests, then running a build and tests after each step.

In plain words
What is it for?
Use it to implement planned features in the project's Go code, reuse existing patterns, and add tools, repositories, services, or other application changes.
Why use it?
It helps prevent changes from being based on a failing starting point or on code that already exists. Test gates make problems visible during implementation.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

This is drujensen/aiagent's own configuration. It tells Claude Code how to work on aiagent itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything aiagent configures →

not rated 5repo 2mo ago A scan 63 tokens original MIT
View source ↗ drujensen/aiagent
Reuse

Borrowing it

Nothing to install: this file belongs to drujensen/aiagent. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/drujensen/aiagent/main/.claude/agents/developer.md
Clone the repo
git clone --depth 1 https://github.com/drujensen/aiagent

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for developer

README.md
[![agentmods](https://agentmods.dev/badge/agents/drujensen/aiagent/developer/github.svg)](https://agentmods.dev/agents/drujensen/aiagent/developer)
Your own site
<a href="https://agentmods.dev/agents/drujensen/aiagent/developer"><img src="https://agentmods.dev/badge/agents/drujensen/aiagent/developer/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for developer

Your own site · 80×15
<a href="https://agentmods.dev/agents/drujensen/aiagent/developer"><img src="https://agentmods.dev/badge/agents/drujensen/aiagent/developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 63 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,207 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00063 $0.01207
Opus 5.5 $0.00025 $0.00483
Sonnet 5.5 $0.00013 $0.00241
Haiku 4.5 $0.00006 $0.00121

Measured 4d ago against content hash 725eaed09af0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 4d 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.

.claude/agents/developer.md · 135 lines

How it starts

The opening of the file, as written. The whole thing — 135 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are an expert Go developer implementing features in the aiagent project — a DDD framework for AI agents.

Mandatory Pre-Implementation Protocol

Execute these steps before writing a single line of code:

  1. Run the test suite. Record the baseline.

    go test ./...

    If tests already fail, stop and report it — do not proceed until the baseline is green.

  2. Read the Reuse Inventory from the plan. Understand every existing utility, service, or pattern listed. Open each file and read it.

  3. Find 2–3 existing features structurally similar to what you are building. Read them fully — not just the interface, but the implementation. For example:

    • If adding a new tool: read internal/impl/tools/file_read.go and internal/impl/tools/todo.go
    • If adding a new repository method: read an existing method in both internal/impl/repositories/json/ and internal/impl/repositories/mongo/
    • If adding a new service: read internal/domain/services/agent_service.go

  4. Only after steps 1–3 are complete: begin implementing.

Step-by-Step Execution with Test Gates

  • Execute one plan step at a time
  • After each step, run: go build . && go test ./...
  • If tests fail, fix the regression before moving to the next step — never carry a broken baseline forward
  • Never implement multiple steps before verifying the previous one compiles and tests pass

DDD Conventions (follow exactly)

Naming:

  • Constructors: NewXxx
  • Interfaces: end with Repository or Service
  • Variables: camelCase; Exported fields: PascalCase

Struct tags on all entity fields:

json:"fieldName" bson:"fieldName"

Error wrapping:

fmt.Errorf("failed to %s: %w", operation, err)

Context: context.Context is the first argument in all repository and service methods.

Import grouping (blank lines between):

  1. Standard library
  2. External packages
  3. Internal: github.com/drujensen/aiagent/...

Dependency rule (never violate): internal/domain/ NEVER imports from internal/impl/.

Read the full file on GitHub · 135 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. 4d ago First seen · 135 lines · 63 tokens per session scan A 725eaed09af0

Subscribe to this mod's changes

developer is an agent published in the GitHub repository drujensen/aiagent (5 stars, last pushed 2mo ago), licensed MIT. It adds 63 tokens to every session and 1,207 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-10-03.

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