What is primer-ai AGENTS.md?

Project instructions for primer-ai, a TypeScript and Node.js command-line tool. They explain the project’s goals, rules, documentation map, and verification practices.

Guiding design work, keeping edits focused, finding architecture and API rules, updating documentation, and running reliable checks.

They give coding agents the project context and point them to the right guidance before making changes.

How stackoverworld/primer-ai configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to stackoverworld/primer-ai. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/stackoverworld/primer-ai/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/stackoverworld/primer-ai

Made for: Codex, OpenCode.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/stackoverworld/primer-ai/agents-md/github.svg)](https://agentmods.dev/instructions/stackoverworld/primer-ai/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/stackoverworld/primer-ai/agents-md"><img src="https://agentmods.dev/badge/instructions/stackoverworld/primer-ai/agents-md/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/stackoverworld/primer-ai/agents-md"><img src="https://agentmods.dev/badge/instructions/stackoverworld/primer-ai/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,367 This file is loaded in full into every session.

When invoked 1,367 The same file — it is already loaded in full.

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.

Model	Per session	Once invoked
Fable 5.1	$0.01367	$0.01367
Opus 5.5	$0.00547	$0.00547
Sonnet 5.5	$0.00273	$0.00273
Haiku 4.5	$0.00137	$0.00137

Measured 2mo ago against content hash 054eb8bd0c1a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

primer-ai AGENTS.md 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.

AGENTS.md · 100 lines

How it starts

The opening of the file, as written. The whole thing — 100 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Mission

Project: primer-ai
Goal: Build primer-ai with an agent-optimized architecture and reproducible delivery workflow.
Stack focus: TypeScript + Node.js
Shape: Cli Tool
Target coding assistants: codex

Always-Loaded Rules

Treat this file as the routing layer, not the full handbook.
Pull detailed guidance from docs/index.md before major design changes.
Keep edits scoped; avoid unrelated cleanup unless explicitly requested.
Prefer deterministic checks over prose-only guidance.
Update docs when architecture or contracts change.
Keep responses concise, concrete, and verifiable.
Prefer invoking project automation over manual style enforcement.

Progressive Disclosure Map

docs/index.md: source-of-truth index for project knowledge.
docs/architecture.md: bounded contexts, module boundaries, dependency direction.
docs/api-contracts.md: contracts, schemas, and compatibility policy.
docs/conventions.md: coding, testing, and collaboration standards.
docs/maintenance.md: verification pipeline, context budget, and freshness policy.
docs/skills.md: curated skill inventory and trigger discipline.
docs/decisions/*.md: ADR history.
docs/runbooks/local-dev.md: environment setup and local operation guide.
skills/**/SKILL.md: reusable task playbooks loaded only when relevant.
src/commands/AGENTS.md: Command UX, validation, and error ergonomics. (applies inside src/commands/).
src/core/AGENTS.md: Core orchestration and side-effect boundaries. (applies inside src/core/).
tests/AGENTS.md: End-to-end command scenarios and edge cases. (applies inside tests/).

Harness Adapters

Codex chain behavior: root AGENTS.md + deeper scoped files are intentionally concise to avoid context truncation.
Claude-specific adapter files are omitted because Claude target was not selected.
Cursor adapters were skipped in this initialization.
Architecture draft source: codex output normalized into deterministic templates.

Read the full file on GitHub · 100 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.

2mo ago First seen · 100 lines · 1,367 tokens per session scan A 054eb8bd0c1a

Subscribe to this mod's changes

primer-ai AGENTS.md is an instructions file published in the GitHub repository stackoverworld/primer-ai (2 stars, last pushed 7mo ago), licensed MIT. It adds 1,367 tokens to every session, about $0.0055 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 2026-08-31.

primer-ai AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
primer-ai AGENTS.mdstackoverworld/primer-ai	Instructions file	2	7mo ago	MIT	A	1,367	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,516	GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	275k	3d ago	MIT	A	4,313	Codex, OpenCode

primer-ai: Instructions file for Codex