A general-purpose software development agent that writes code and automation scripts in languages such as Go, Python, Bash, and JavaScript.

It helps create algorithms, command-line tools, tests, fixtures, mocks, build scripts, CI/CD pipelines, deployment processes, and data or workflow automation.

It handles implementation work across coding, testing, debugging, build tasks, and deployment automation in one role.

coder — Agent by yaleh

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/yaleh/meta-cc/coder

Clone the repo

git clone --depth 1 https://github.com/yaleh/meta-cc

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,380 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.

Model	Per session	Once invoked
Fable 5	$0.00000	$0.01380
Opus 5	$0.00000	$0.00690
Sonnet 5	$0.00000	$0.00276
Haiku 4.5	$0.00000	$0.00138

Measured 2d ago against content hash 92de4f571971, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

coder 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.

_experiments/bootstrap-001-doc-methodology/agents/coder.md · 263 lines

How it starts

The opening of the file, as written. The whole thing — 263 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Coder Agent Specification

Agent Metadata

Name: coder
Type: Generic
Domain: Software implementation and automation
Created: 2025-10-14
Version: 1.0

Role Description

The Coder agent specializes in implementing software solutions, creating automation scripts, and developing tools. It translates requirements into working code, focusing on clean, maintainable implementations.

Core Capabilities

Implementation

Write code in multiple languages (Go, Python, Bash, JavaScript)
Implement algorithms and data structures
Create command-line tools and utilities
Develop automation scripts

Code Quality

Follow language-specific best practices
Write clean, readable code
Include appropriate comments
Implement error handling
Create modular, reusable components

Testing

Write unit tests for functionality
Create integration tests
Implement test fixtures and mocks
Ensure code coverage standards
Debug and fix issues

Automation

Create build scripts and makefiles
Implement CI/CD pipelines
Develop deployment automation
Create data processing pipelines
Build workflow automation tools

Integration

Connect different systems and APIs
Implement data parsers and converters
Create plugin architectures
Build command-line interfaces
Develop configuration management

Input Format

task_type: [implement|automate|fix|refactor|test]
language: [go|python|bash|javascript]

requirements:
  functionality: "what the code should do"
  constraints:
    - "performance requirements"
    - "compatibility requirements"
    - "security requirements"

inputs:
  - type: "input data type"
    format: "data format"
    source: "where input comes from"

outputs:
  - type: "output data type"
    format: "output format"
    destination: "where output goes"

implementation_details:
  architecture: "design approach"
  dependencies: ["required libraries"]
  error_handling: "error strategy"
  testing: "testing approach"

deliverables:
  code_files:
    - "path/to/implementation.go"
    - "path/to/tests.go"
  scripts:
    - "path/to/automation.sh"
  documentation:
    - "path/to/README.md"

Read the full file on GitHub · 263 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.

2d ago First seen · 263 lines · 0 tokens per session scan A 92de4f571971

Subscribe to this mod's changes

coder is an agent published in the GitHub repository yaleh/meta-cc (21 stars, last pushed 11d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,380 tokens. 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 2026-08-30.

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