build-right-preflight

build-right-preflight is a skill for Codex from pax-k/build-right. It costs 69 tokens per session (1,881 once invoked), scanned A, original, MIT.

A preparation guide for getting a software project ready before repeated AI-assisted implementation begins.

In plain words
What is it for?
Use it to prepare a new or existing project, validate assumptions, define an MVP, create project guidance, and set up Sprint 0 tasks.
Why use it?
It helps turn founder intent and assumptions into agreed product facts, scope, operating documents, and initial work items.

Skill for Codex

Written for Codex: agents/openai.yaml present. Also seen: mentions subagents; $skill-name invocation.

Good fit Use it to prepare a new or existing project, validate assumptions, define an MVP, create project guidance, and set up Sprint 0 tasks.

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Install with agentmods
npx agentmods add skills/pax-k/build-right/build-right-preflight
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.

Any agent
npx skills add pax-k/build-right --skill build-right-preflight
Clone the repo
git clone --depth 1 https://github.com/pax-k/build-right

Made for: Codex.

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 build-right-preflight

README.md
[![agentmods](https://agentmods.dev/badge/skills/pax-k/build-right/build-right-preflight/github.svg)](https://agentmods.dev/skills/pax-k/build-right/build-right-preflight)
Your own site
<a href="https://agentmods.dev/skills/pax-k/build-right/build-right-preflight"><img src="https://agentmods.dev/badge/skills/pax-k/build-right/build-right-preflight/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 build-right-preflight

Your own site · 80×15
<a href="https://agentmods.dev/skills/pax-k/build-right/build-right-preflight"><img src="https://agentmods.dev/badge/skills/pax-k/build-right/build-right-preflight.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 69 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,881 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 $0.00069 $0.01881
Opus 5 $0.00034 $0.00941
Sonnet 5 $0.00014 $0.00376
Haiku 4.5 $0.00007 $0.00188

Measured 10d ago against content hash 8f0b742a9ec0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

build-right-preflight 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 10d ago.

The scan reads SKILL.md. This mod also ships 14 executable files (scripts/ensure-openspec.ts, scripts/lib/openspec/adapter.ts, scripts/lib/openspec/atomic-install.ts, …), 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.

skills/build-right-preflight/SKILL.md · 203 lines

How it starts

The opening of the file, as written. The whole thing — 203 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Build Right Preflight

Use this skill to prepare a project before repetitive AI execution begins.

Core rule:

AI drafts the map.
Founder validates the terrain.
Evidence upgrades assumptions into truth.
Only then AI executes.

Required Reading

  • Always read references/workflow.md before acting.
  • Read references/founder-gates.md before asking founder questions, deciding readiness, or advancing past a stop/ask gate.
  • Read references/research-and-delegation.md only when web research, public-evidence claims, existing-project inventory, conflict review, or subagent delegation triggers apply.
  • Read references/artifact-contract.md before creating or updating docs or tasks.
  • Read references/domain-language.md when overloaded terms, aliases, multiple actors, or missing domain expertise affect requirements.
  • Read references/prototype-routing.md when a behavioral or visual question can be answered empirically before planning.
  • Read ../build-right-engineering-principles/references/principles.md when creating or changing architecture boundaries, execution rules, package ownership, provider boundaries, generated-code rules, or enforceable engineering policy.
  • Use files in assets/templates/ as starting points when creating artifacts.
  • Use bundled scripts/preflight-check.ts for deterministic inventory, readiness signals, and one preflight decision. Treat script output as input to judgment, not authority.
  • Use bundled scripts/ensure-openspec.ts after repository inventory. This is Build Right's idempotent managed planning setup; do not ask the user to install, initialize, configure, or invoke the planning provider.
  • Invoke every managed helper used as evidence as its own direct Bun shell command. Do not chain it with &&, ;, pipes, redirects, or trailing commands; the native evidence gate binds success to that isolated invocation.

Operating Mode

  1. Inspect the project first.
  2. Classify it as blank/new or existing.
  3. Classify source mode as founder-fed, web-assisted, or public-first-prototype.
  4. Run the read-only preflight helper when available:

Read the full file on GitHub · 203 lines

Files

What ships with it

48 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 10d ago First seen · 203 lines · 69 tokens per session scan A 8f0b742a9ec0

Subscribe to this mod's changes

build-right-preflight is a skill published in the GitHub repository pax-k/build-right (4 stars, last pushed 1mo ago), licensed MIT. It adds 69 tokens to every session and 1,881 once invoked, about $0.0003 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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