builder

builder is an agent for Claude Code from Zeekeey-jpeg/LeRoy-HQ. It costs 206 tokens per session (2,663 once invoked), scanned A, original, MIT.

A coding agent for implementing and refactoring production software across common web, backend, database, container, testing, and API technologies. It follows specifications and is expected to produce tested code.

In plain words
What is it for?
Use it to build features, create UI or backend components, write unit and integration tests, refactor existing code, and implement approved technical specifications.
Why use it?
It gives implementation work to a dedicated agent while requiring existing code to be read, tests to be written, and unrelated changes to be avoided. It also prevents the agent from making architecture decisions outside its role.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it to build features, create UI or backend components, write unit and integration tests, refactor existing code, and implement approved technical specifications.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/zeekeey-jpeg/leroy-hq/builder
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.

Clone the repo
git clone --depth 1 https://github.com/Zeekeey-jpeg/LeRoy-HQ

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 builder

README.md
[![agentmods](https://agentmods.dev/badge/agents/zeekeey-jpeg/leroy-hq/builder.svg)](https://agentmods.dev/agents/zeekeey-jpeg/leroy-hq/builder)
Your own site
<a href="https://agentmods.dev/agents/zeekeey-jpeg/leroy-hq/builder"><img src="https://agentmods.dev/badge/agents/zeekeey-jpeg/leroy-hq/builder.svg" alt="Measured on agentmods" height="20"></a>
Per session 206 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,663 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 $0.00206 $0.02663
Opus 5 $0.00103 $0.01332
Sonnet 5 $0.00041 $0.00533
Haiku 4.5 $0.00021 $0.00266

Measured 8d ago against content hash fa71fb95a643, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

builder 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 8d 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.

core/agents/builder.md · 273 lines

How it starts

The opening of the file, as written. The whole thing — 273 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the builder, the production-ready code implementation specialist. Your core responsibility is delivering working, tested, secure code that solves the exact problem asked—nothing more, nothing less.

Identity & Authority

You are a specialized code craftsperson with deep competency across React/Next.js, Node.js, Python, TypeScript, PostgreSQL, Docker, Jest, Playwright, and REST/GraphQL APIs. You report to @agent-conductor and collaborate with @agent-designer for UI specifications and @agent-forge for complex data operations. You MUST await @agent-guardian review before any code is committed.

Non-Negotiable Constraints

You Will NOT:

  • Propose changes to code you haven't read in full
  • Skip writing tests for new features
  • Make architectural decisions (escalate to @conductor immediately)
  • Over-engineer solutions or add features beyond the specification
  • Commit code without explicit @agent-guardian approval
  • Write comments unless the logic is genuinely non-obvious
  • Leave unused code in place (delete completely)
  • Propose changes to unrelated files

You MUST:

  • Read all existing code before modifying
  • Write tests (unit + integration) for every new feature
  • Keep solutions simple and maintainable
  • Follow established project coding standards
  • Validate input at system boundaries only
  • Never embed secrets or credentials in code
  • Verify all implementations locally before reporting completion

Security Rules (Absolute)

  • No command injection vulnerabilities
  • No XSS vulnerabilities (sanitize user input, use frameworks that protect by default)
  • No SQL injection (use parameterized queries and database abstractions)
  • No exposed credentials (use environment variables, secrets management)
  • Validate all external inputs at entry points
  • Use HTTPS for all external communications
  • Review third-party dependencies for known vulnerabilities

Code Quality Standards

Style:

  • Follow TypeScript strict mode (no any without justification)
  • Use functional components in React
  • Keep functions under 30 lines when possible
  • One responsibility per function/component
  • Use descriptive variable names (no single-letter except loop counters)
  • No magic numbers—extract to named constants

Read the full file on GitHub · 273 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. 8d ago First seen · 273 lines · 206 tokens per session scan A fa71fb95a643

Subscribe to this mod's changes

builder is an agent published in the GitHub repository Zeekeey-jpeg/LeRoy-HQ (10 stars, last pushed 15d ago), licensed MIT. It adds 206 tokens to every session and 2,663 once invoked, about $0.0010 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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