mk:autobuild

mk:autobuild is a skill for Claude Code from ngocsangyem/MeowKit. It costs 102 tokens per session (2,351 once invoked), scanned A, original, MIT.

A coordinator for building a new product from an empty starting point through research, design, planning, code generation, evaluation, and a ship decision.

In plain words
What is it for?
Use it for greenfield products such as a new app or game when the build is expected to run autonomously for an extended period.
Why use it?
It organizes long-running autonomous builds into stages with checks, budget limits, and a time limit.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: mentions subagents; names the AskUserQuestion tool.

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 skills/ngocsangyem/meowkit/autobuild
Any agent
npx skills add ngocsangyem/MeowKit --skill autobuild
Clone the repo
git clone --depth 1 https://github.com/ngocsangyem/MeowKit

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 mk:autobuild

README.md
[![agentmods](https://agentmods.dev/badge/skills/ngocsangyem/meowkit/autobuild.svg)](https://agentmods.dev/skills/ngocsangyem/meowkit/autobuild)
Your own site
<a href="https://agentmods.dev/skills/ngocsangyem/meowkit/autobuild"><img src="https://agentmods.dev/badge/skills/ngocsangyem/meowkit/autobuild.svg" alt="Measured on agentmods" height="20"></a>
Per session 102 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,351 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 5.1 $0.00102 $0.02351
Opus 5 $0.00051 $0.01175
Sonnet 5 $0.00020 $0.00470
Haiku 4.5 $0.00010 $0.00235

Measured 2d ago against content hash 3e240f713a46, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

mk:autobuild 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.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/budget-tracker.sh, scripts/density-select.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

.claude/skills/autobuild/SKILL.md · 197 lines

How it starts

The opening of the file, as written. The whole thing — 197 lines — stays where its author put it; the contents beside it link to each section on GitHub.

mk:autobuild — Autonomous Multi-Hour Build Orchestration

Step-file workflow that runs the complete generator/evaluator harness pipeline as an autonomous build. Handles green-field product builds (planner stage → contract stage → evaluator loop → ship decision) with adaptive scaffolding density based on detected model tier.

When to Use

Activate when:

  • User runs /mk:autobuild "build a X" (or any green-field product description)
  • Existing kit detection routes a green-field "build me an app" intent here instead of mk:cook
  • A multi-hour autonomous build is requested with no manual handholding

Skip when:

  • The task is a single feature, bug fix, or refactor → use /mk:cook instead
  • The task is a doc update → use the existing doc skills
  • The request is "explain X" or "review Y" → use the appropriate single-shot skill

Hard Constraints

  1. Adaptive density — picks scaffolding density via mk:scale-routing (or density-select.sh); honors MEOWKIT_AUTOBUILD_MODE env override
  2. Budget caps — warns at $30 spent, requires explicit approval at $100, hard-blocks at user-set --budget value
  3. 6-hour wall-clock timeout — hard limit per Anthropic's observed runs ; checkpoints every step for resumability
  4. Max 3 iteration rounds between generator and evaluator before escalating to human (configurable via --max-iter)
  5. Run report mandatory — every autobuild run produces tasks/autobuild-runs/YYMMDD-{slug}/run.md with full audit trail
  6. Coexists with mk:cook — does not replace it; both route through Gate 1 + Gate 2
  7. TDD opt-in (parallel to cook): autobuild respects --tdd like other flows. Default: no RED-phase gate. With --tdd: writes the .claude/session-state/tdd-mode sentinel and the developer waits on tester before each generator iteration. Active-verification HARD GATE (Rule 8 of harness-rules.md) is independent of TDD mode and always applies.

Read the full file on GitHub · 197 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 · 197 lines · 102 tokens per session scan A 3e240f713a46

Subscribe to this mod's changes

mk:autobuild is a skill published in the GitHub repository ngocsangyem/MeowKit (14 stars, last pushed 1mo ago), licensed MIT. It adds 102 tokens to every session and 2,351 once invoked, about $0.0005 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 2026-09-03.

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