What is skills AGENTS.md?

Repository instructions describing how Buildkite-related agent skills are organized and written. Buildkite is a service for running automated software build and test pipelines.

Use them when creating, editing, or reviewing skills for Buildkite pipelines, migration, agents, APIs, or the Buildkite command-line tool.

They give coding agents the project context and conventions needed to work consistently in that repository.

How buildkite/skills configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to buildkite/skills. 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/buildkite/skills/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/buildkite/skills

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/buildkite/skills/agents-md/github.svg)](https://agentmods.dev/instructions/buildkite/skills/agents-md)

Your own site

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

Per session 718 This file is loaded in full into every session.

When invoked 718 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	$0.00718	$0.00718
Opus 5.5	$0.00287	$0.00287
Sonnet 5.5	$0.00144	$0.00144
Haiku 4.5	$0.00072	$0.00072

Measured 1mo ago against content hash b59861138e87, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

skills 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 1mo 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 · 59 lines

How it starts

The opening of the file, as written. The whole thing — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Buildkite Skills — Agent Context

A collection of AI agent skills that teach coding agents how to use Buildkite CI/CD. Installed via npx skills add buildkite/skills or manually copied into agent skill directories.

Repository Structure

skills/                              # All skills live here
  buildkite-pipelines/               # Journey — pipeline YAML, step types, caching, parallelism
  buildkite-migration/               # Journey — CI migration, bk pipeline convert, converting from GitHub Actions, Jenkins, CircleCI, Bitbucket, GitLab CI
  buildkite-preflight/               # Cross-cutting — bk preflight against local uncommitted changes
  buildkite-agent-runtime/           # Cross-cutting — buildkite-agent subcommands in job steps
  buildkite-cache/                   # Cross-cutting — Buildkite Cache (preview): cache save/restore, .buildkite/cache.yml
  buildkite-cli/                     # Cross-cutting — bk CLI commands
  buildkite-api/                     # Cross-cutting — REST API, GraphQL, webhooks

Skill Architecture

Each skill directory contains:

SKILL.md (required) — core skill content, 10-18KB typical
references/ (optional) — detailed content loaded on demand
examples/ (optional) — complete runnable examples
agents/openai.yaml (required) — multi-agent platform metadata
assets/ (required) — icon and brand assets for agent marketplaces

Skills use progressive disclosure:

Metadata (name + description) — always in context (~100 words)
SKILL.md body — loaded when skill triggers (~1,500-2,500 words)
Bundled resources — loaded as needed by the agent (unlimited)

Skills vs. Documentation

Skills are not documentation rewrites. They encode expertise — the judgment calls, defaults, and pitfalls that experienced Buildkite users know — rather than cataloguing features. Buildkite docs explain what's possible; skills teach agents how to do it correctly.

Assume the agent is already smart. Only include context it cannot infer on its own. Link to Buildkite docs for canonical reference; do not reproduce them.

Read the full file on GitHub · 59 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.

1mo ago Changed · +1 lines · +28 tokens per session b59861138e87
2mo ago First seen · 58 lines · 690 tokens per session scan A 48d9d5b4da8c

Subscribe to this mod's changes

skills AGENTS.md is an instructions file published in the GitHub repository buildkite/skills (19 stars, last pushed 15d ago), licensed MIT. It adds 718 tokens to every session, about $0.0029 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 2026-08-30.

CI and CD DevOps and cloud agents ai buildkite skills

skills AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
skills AGENTS.mdbuildkite/skills	Instructions file	19	15d ago	MIT	A	718	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

skills: Instructions file for Codex