ralph-coder

A coding agent that implements one Ralph user story, a small, defined development task, from an orchestrator's specification. It writes production code and documentation but not tests.

In plain words
What is it for?
Use it to implement a single story in projects such as Next.js or FastAPI applications, while checking acceptance criteria, framework patterns, documentation needs, and recent history.
Why use it?
It gives the implementation phase a clear process for understanding requirements, existing code, project conventions, and previous progress.

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/cfircoo/claude-code-toolkit/ralph-coder
Clone the repo
git clone --depth 1 https://github.com/cfircoo/claude-code-toolkit
Per session 42 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,614 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 $0.00042 $0.01614
Opus 5 $0.00021 $0.00807
Sonnet 5 $0.00008 $0.00323
Haiku 4.5 $0.00004 $0.00161

Measured 2d ago against content hash 02e79643b6af, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ralph-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.

agents/ralph-coder.md · 130 lines

How it starts

The opening of the file, as written. The whole thing — 130 lines — stays where its author put it; the contents beside it link to each section on GitHub.

<context_loading> Your Task prompt from the orchestrator includes:

  • story: The full story object (id, title, description, acceptanceCriteria, storyType, docsToUpdate)
  • framework_profile: Detected project framework, test runner, ORM, etc.
  • progress_learnings: Relevant entries from tasks/progress.txt
  • coder_agent: The agent name being used (may be you or a project-specific agent)

On startup:

  1. Read the story spec carefully — understand every acceptance criterion
  2. Read tasks/progress.txt for learnings from prior iterations
  3. Check git log --oneline -10 for recent changes and context
  4. Explore the codebase to understand existing patterns before writing code </context_loading>

<framework_patterns> Use these as starting hints — always defer to actual project conventions found in the codebase:

Next.js App Router: app/ directory, server components by default, server actions, route.ts for API routes, layout.tsx / page.tsx structure Next.js Pages: pages/ directory, getServerSideProps/getStaticProps, API routes in pages/api/ FastAPI: Dependency injection, Pydantic models, async route handlers, APIRouter grouping Express: Router middleware, controller/service pattern, error middleware NestJS: Decorators, modules, controllers, services, dependency injection Prisma: Schema in prisma/schema.prisma, prisma migrate dev for migrations, typed client Drizzle: Schema files, drizzle-kit generate for migrations, typed queries SQLAlchemy: Models with Mapped[], Alembic migrations, async sessions Django: Models, views, serializers, URL patterns, makemigrations/migrate </framework_patterns>

<storytype_guidance> database: Schema changes, migrations, seed data. Run migration after schema change. Ensure backward compatibility. backend / api: Route handlers, services, middleware, business logic. Follow existing routing patterns. frontend: Components, pages, layouts, client-side logic. Match existing component patterns and styling approach. infra: Config files, Docker, CI/CD, environment variables. Validate configs are syntactically correct. test: This storyType means the story IS about writing tests — implement the test infrastructure/fixtures requested. </storytype_guidance>

Read the full file on GitHub · 130 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 · 130 lines · 42 tokens per session scan A 02e79643b6af

Subscribe to this mod's changes

ralph-coder is an agent published in the GitHub repository cfircoo/claude-code-toolkit (17 stars, last pushed 5mo ago), licensed MIT. It adds 42 tokens to every session and 1,614 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 2026-08-30.

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