Borrowing it
Nothing to install: this file belongs to reidemeister94/development-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.
curl -O https://raw.githubusercontent.com/reidemeister94/development-skills/main/AGENTS.mdgit clone --depth 1 https://github.com/reidemeister94/development-skillsWrote 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.
[](https://agentmods.dev/instructions/reidemeister94/development-skills/agents-md)<a href="https://agentmods.dev/instructions/reidemeister94/development-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/reidemeister94/development-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.
<a href="https://agentmods.dev/instructions/reidemeister94/development-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/reidemeister94/development-skills/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00560 | $0.00560 |
| Opus 5.5 | $0.00224 | $0.00224 |
| Sonnet 5.5 | $0.00112 | $0.00112 |
| Haiku 4.5 | $0.00056 | $0.00056 |
Grade A, and why
development-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.
What it actually says
Development skills
This repository is the source of the development-skills plugin for Claude Code and Codex CLI.
- Challenge unsupported assumptions. Evidence validates a decision; agreement alone does not.
- Use the smallest useful change. Every changed line must trace to the request.
- Follow
shared/development-loop.mdfor scope, authorization, checks, and completion. - Follow
shared/writing.mdfor every natural-language artifact. - Follow
shared/engineering.mdfor code and design. - Test new behavior with a failing proof when practical. Keep refactor characterization proof green before and after.
- Never suppress a failing check or weaken proof to claim success.
- Preserve user work and inspect callers before removing or moving files.
- Store durable reasons in chronicles and resumable execution state in plans.
- Commit only when explicitly requested. Never add AI attribution or
Co-Authored-Bytrailers.
- Skills and agents reference canonical files under
shared/; they do not copy those contracts. - One named subagent ships:
staff-reviewer. Implementation and verification stay in the main context. - The plugin is language-agnostic and ships no organization, language, framework, or product conventions.
pyproject.tomlexists for repository tools. The plugin is not a Python package.- Use
uvfor Python commands. - Hooks run on Claude Code and supported Codex versions. Document a manual fallback for a new hook.
- Personal machine facts stay in ignored
.claude/CLAUDE.mdor global Codex instructions.
Version files are VERSION, pyproject.toml, both plugin manifests, and .claude-plugin/marketplace.json.
Use Commitizen to update them together.
Use --files-only when a tag or automatic commit is not authorized.
Create or move a tag only after explicit confirmation.
| Rule | Scope | Topic |
|---|---|---|
.agents/rules/skill-authoring.md |
skills/**, agents/** |
Skill and subagent structure. |
.agents/rules/shared-canonical.md |
shared/** |
Canonical workflow files. |
.agents/rules/plugin-packaging.md |
Manifests, catalogs, versions, changelog | Packaging and releases. |
.agents/rules/formatting-hooks.md |
hooks/** |
Formatting and hook behavior. |
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 · -817 tokens per session scan B → A 82f38bc545ee
- 1mo ago First seen · 34 lines · 1,377 tokens per session scan B 47285de9a00d
development-skills AGENTS.md is an instructions file published in the GitHub repository reidemeister94/development-skills (12 stars, last pushed 1mo ago), licensed MIT. It adds 560 tokens to every session, about $0.0022 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.