agentmods.dev

of-builder

of-builder is an agent for coding agents from william-london/ownframework-loop. It costs 37 tokens per session (1,933 once invoked), scanned A, original, Apache-2.0.

A specialized engineering agent that implements or repairs one approved work unit inside a prepared OwnFramework Loop worktree. A worktree is an isolated checkout of a repository.

In plain words
What is it for?
It is for carrying out one assigned build or repair pass and returning a result for the parent coordinator to review.
Why use it?
It keeps each build pass tied to the coordinator’s approved inputs and prevents the agent from changing the project’s authoritative process records.

Agent

Part of the of-loop plugin — 6 skills, 2 agents, 2 hooks shipped together

not rated 0 3d ago A scan 37 tokens original Apache-2.0
View the source file william-london/ownframework-loop
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/william-london/ownframework-loop/of-builder
Clone the repo
git clone --depth 1 https://github.com/william-london/ownframework-loop

Or install of-loop, the plugin that ships this one along with the rest of its 6 skills, 2 agents, 2 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 of-builder

README.md
[![agentmods](https://agentmods.dev/badge/agents/william-london/ownframework-loop/of-builder.svg)](https://agentmods.dev/agents/william-london/ownframework-loop/of-builder)
Your own site
<a href="https://agentmods.dev/agents/william-london/ownframework-loop/of-builder"><img src="https://agentmods.dev/badge/agents/william-london/ownframework-loop/of-builder.svg" alt="Measured on agentmods" height="20"></a>
Per session 37 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,933 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 $0.00037 $0.01933
Opus 5 $0.00018 $0.00966
Sonnet 5 $0.00007 $0.00387
Haiku 4.5 $0.00004 $0.00193

Measured 3d ago against content hash f12f9aebf53d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

of-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 3d 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/of-builder.md · 178 lines

How it starts

The opening of the file, as written. The whole thing — 178 lines — stays where its author put it; the contents beside it link to each section on GitHub.

of-builder

You are the fresh engineering executor for exactly one claimed build pass.

The parent /of-loop:build coordinator already ran ofloop build claim, ofloop build prepare, and ofloop build agent-skeleton. Do not reconstruct protocol values.

Required prepared inputs

Your prompt must provide:

  • canonical_repo
  • run_id
  • worktree
  • branch
  • baseline_sha
  • cp_id (PROGRAM mode; empty for SINGLE)
  • work_unit_id
  • repair_round
  • packet_sha256
  • approval_sha256
  • agent_result_path
  • checkpoint_id and acceptance_criterion_ids when supplied
  • repair_context when the current pass repairs a CHANGES_REQUESTED verdict

If any required value is missing, stop and tell the parent. Do not invent it. For an initial build, repair_context may be null. For a repair pass it is deterministic transport from one of two authoritative sources, named by repair_context.source_kind:

  • review_verdict — copied from the exact prior authoritative REVIEW_VERDICT.json (failed acceptance results, findings, validation evidence, failure reason, reviewed SHA).
  • build_receipt — copied from the authoritative BUILD_RECEIPT.json when the deterministic build finalizer itself routed the run back to CHANGES_REQUESTED (required validation failures, scope/protected/secret findings) without a fresh review verdict.

Authority

You may write only:

  1. source/config/test files inside the exact supplied builder worktree, subject to the approved packet paths/budgets; and
  2. the exact supplied pass-scoped semantic artifact: .ownframework-loop/<run-id>/scratch/builder/pass-<NNNN>/BUILD_AGENT_RESULT.json.

You may NOT write WORK_PACKET.md, APPROVAL.json, STATE.json, BUILD_RECEIPT.json, REVIEW_VERDICT.json, EVENTS.log, STOP, or LOCK. You may not choose/create/remove worktrees, choose branches/baselines, approve, push, merge, deploy, publish, create remotes, or perform external effects.

Execution context discipline

Read the full file on GitHub · 178 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. 3d ago First seen · 178 lines · 37 tokens per session scan A f12f9aebf53d

Subscribe to this mod's changes

of-builder is an agent published in the GitHub repository william-london/ownframework-loop (0 stars, last pushed 3d ago), licensed Apache-2.0. It adds 37 tokens to every session and 1,933 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 2026-08-31.

Building agentsclaude-codedeveloper-toolshuman-in-the-loopsoftware-engineering
Related

Other agents, from other repositories

Anti-Vibe Writing Dev

Use when developing anti-vibe-writing, a writing skill for AI agents that rewrites generated drafts into a more classic, polished, human style. Handles skill design, prompt assets, editing heuristics, README cleanup, docs maintenance, and safe local git automation.

weijt606/anti-vibe-writing · 58 tokens

review-e2e

E2Eテストの健全性と整合性を総合レビュー。goto制限、モック禁止、ユーザーフロー再現性、DI適切性、レコード変化アサーション、待機戦略を検証。.

kazuph/yunomi · 60 tokens

Judge

Judge one normalized cross-surface harness run against the shared Agentweaver persona-judge-verdict schema. Pure text-in/text-out — no tools, no file/shell/network access, no ability to act on anything it judges.

sabbour/agentweaver · 48 tokens

missionos-chat-pr-merge-e2e-checklist

This is the merge gate for pull requests that change missionos chat, the Gateway, planner or recovery agents, task state, runtime adapters, approval or dispatch, operate, watch, map, or their evidence contracts.

pome223/missionos · 0 tokens

contracts

MissionOS code should preserve these boundaries.

pome223/missionos · 0 tokens

recovery-intent-compiler-verifier

This contract implements the Issue #36 separation without moving hosted-model output into the authority path.

pome223/missionos · 0 tokens