builder

builder is an agent for coding agents from UnpaidAttention/fable5-methodology. It costs 78 tokens per session (848 once invoked), scanned A, original, no licence file.

A helper agent that implements one clearly defined coding change with explicit acceptance criteria. Acceptance criteria are the concrete conditions that determine whether the work is finished.

In plain words
What is it for?
It is for building a scoped feature or fix when the required files or area and the definition of done are already known.
Why use it?
It gives a specified task to one focused implementer, while avoiding use for open-ended investigation or decisions that have not been settled.

Agent

Part of the fable5-methodology plugin — 26 skills, 4 agents, 5 hooks shipped together

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/unpaidattention/fable5-methodology/builder
Clone the repo
git clone --depth 1 https://github.com/UnpaidAttention/fable5-methodology

Or install fable5-methodology, the plugin that ships this one along with the rest of its 26 skills, 4 agents, 5 hooks.

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/unpaidattention/fable5-methodology/builder.svg)](https://agentmods.dev/agents/unpaidattention/fable5-methodology/builder)
Your own site
<a href="https://agentmods.dev/agents/unpaidattention/fable5-methodology/builder"><img src="https://agentmods.dev/badge/agents/unpaidattention/fable5-methodology/builder.svg" alt="Measured on agentmods" height="20"></a>
Per session 78 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 848 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00078 $0.00848
Opus 5 $0.00039 $0.00424
Sonnet 5 $0.00016 $0.00170
Haiku 4.5 $0.00008 $0.00085

Measured 4d ago against content hash acac5f685391, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 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.

agents/builder.md · 72 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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 · 72 lines · 78 tokens per session scan A acac5f685391

Subscribe to this mod's changes

builder is an agent published in the GitHub repository UnpaidAttention/fable5-methodology (91 stars, last pushed 1mo ago), with no licence file. It adds 78 tokens to every session and 848 once invoked, about $0.0004 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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