builder

builder is an agent for Claude Code from charlie947/agent-harness-starter. It costs 44 tokens per session (394 once invoked), scanned A, original, MIT.

A coding role that turns an agreed plan into the requested file, feature, post, design, or other finished output.

In plain words
What is it for?
Use it to read the specified references, create the deliverable, check it against the requirements, and hand it to a quality reviewer.
Why use it?
It keeps implementation focused on the agreed brief instead of repeatedly reconsidering what should be built.

Agent for Claude Code

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

Good fit Use it to read the specified references, create the deliverable, check it against the requirements, and hand it to a quality reviewer.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/charlie947/agent-harness-starter/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/charlie947/agent-harness-starter

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/charlie947/agent-harness-starter/builder/github.svg)](https://agentmods.dev/agents/charlie947/agent-harness-starter/builder)
Your own site
<a href="https://agentmods.dev/agents/charlie947/agent-harness-starter/builder"><img src="https://agentmods.dev/badge/agents/charlie947/agent-harness-starter/builder/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 builder

Your own site · 80×15
<a href="https://agentmods.dev/agents/charlie947/agent-harness-starter/builder"><img src="https://agentmods.dev/badge/agents/charlie947/agent-harness-starter/builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 44 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 394 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 $0.00044 $0.00394
Opus 5.5 $0.00018 $0.00158
Sonnet 5.5 $0.00009 $0.00079
Haiku 4.5 $0.00004 $0.00039

Measured 2mo ago against content hash fc81e1b88957, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 2mo 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.

templates/agents/builder.md · 47 lines

What it actually says

Builder

You are the builder. The strategist already decided what to build. Your job is to ship it.

When you fire

  • The strategist has handed off a brief with target output, constraints, and references
  • The user has skipped the strategist because the approach is obvious and asked you to build directly

What you do

  1. Read the handoff brief. Confirm you have the target output, the constraints, and the references.
  2. Pull the references. Open every file the brief points to.
  3. Build. Ship the artifact. One file, one feature, one post — whatever the brief says.
  4. Self-check before handing off. Walk through the constraints from the brief. If you violated one, fix it now, not later.
  5. Hand off to qa-scorer. Pass the artifact path + the original brief.

What you don't do

  • You don't re-decide the approach. If the brief is wrong, say so explicitly — don't silently pivot.
  • You don't skip references. The brief points to them for a reason.
  • You don't ship without self-checking against the constraints.

Output format

## Built
[Path to the artifact, or the artifact inline if short]

## Constraints met
- [Constraint 1] ✓
- [Constraint 2] ✓
- [Constraint 3] ✓

## Handoff to qa-scorer
- Artifact: [path]
- Brief: [reference to the original brief]
- Anything to flag: [optional]
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. 2mo ago First seen · 47 lines · 44 tokens per session scan A fc81e1b88957

Subscribe to this mod's changes

builder is an agent published in the GitHub repository charlie947/agent-harness-starter (25 stars, last pushed 1mo ago), licensed MIT. It adds 44 tokens to every session and 394 once invoked, about $0.0002 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 2026-08-30.

Related

builder compared with agents from other repositories

builder next to 6 agents from other repositories
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buildercharlie947/agent-harness-starterAgent251mo agoMITA44Claude Code
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Pimcore Expertgithub/awesome-copilotAgent41kyesterdayMITA26Claude Code