Borrowing it
Nothing to install: this file belongs to ytvee-dev/webdev-agent-kit. 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/ytvee-dev/webdev-agent-kit/main/AGENTS.mdgit clone --depth 1 https://github.com/ytvee-dev/webdev-agent-kitWrote 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/ytvee-dev/webdev-agent-kit/agents-md)<a href="https://agentmods.dev/instructions/ytvee-dev/webdev-agent-kit/agents-md"><img src="https://agentmods.dev/badge/instructions/ytvee-dev/webdev-agent-kit/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/ytvee-dev/webdev-agent-kit/agents-md"><img src="https://agentmods.dev/badge/instructions/ytvee-dev/webdev-agent-kit/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 | $0.01439 | $0.01439 |
| Opus 5.5 | $0.00576 | $0.00576 |
| Sonnet 5.5 | $0.00288 | $0.00288 |
| Haiku 4.5 | $0.00144 | $0.00144 |
Grade A, and why
webdev-agent-kit 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 3d 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.
How it starts
The opening of the file, as written. The whole thing — 93 lines — stays where its author put it; the contents beside it link to each section on GitHub.
WebDev Agent Kit Runtime Policy
Purpose
Route work to portable policy, applicable profiles, verified project facts and the matching skill. Load detailed rules only when relevant.
Bundle paths are rooted at the installed bundle: .agents for project targets or the native plugin root. Generated dist/** output is never source truth. Only approved project-onboarding-adapter work may replace the host-root instruction pointer.
Precedence And Approvals
Resolve conflicts through common/policy-precedence.md: system, client security, and sandbox restrictions; current user request; confirmed scope and approvals; host-project instructions; verified project/** facts; selected skill; active profile; generic defaults.
Require explicit approval before installing packages or tools, changing configuration outside scope, adding test infrastructure, replacing project instructions, performing irreversible actions, or contacting external people or systems. New tests require an explicit current request; relevant existing-test maintenance follows common/test-policy.md.
README.md may be read only when relevant under common/readme-policy.md, never as sole technical evidence or runtime authority. Reading never authorizes editing. Do not create or change an existing README unless the current user explicitly requests that README change.
Context Loading And Workflow Scale
In Codex, when a local model-routing profile exists, consult
common/codex-model-routing-policy.md before broad reading or delegation.
In Claude Code, consult common/claude-agent-routing-policy.md when delegation
is relevant; use verified native roles and preserve single-agent fallback.
Classify before reading broadly:
Fast Lookup: narrow question, file location, or code explanation; search and read only decisive snippets.Lightweight Workflow: one obvious, low-risk local change; avoid planning and toolchain overhead.Standard Workflow: multi-file work, unclear root cause, refactor boundary, or bounded verification.Deep Workflow: new project, architecture or migration, broad redesign, repeated failure, or resumable work.
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.
- 3d ago Changed · +5 lines · +25 tokens per session ebfed27a24be
- 1mo ago Changed · +6 lines · +78 tokens per session 4d6e87982371
- 1mo ago First seen · 82 lines · 1,336 tokens per session scan A fd6275987bac
webdev-agent-kit AGENTS.md is an instructions file published in the GitHub repository ytvee-dev/webdev-agent-kit (7 stars, last pushed 4d ago), licensed Apache-2.0. It adds 1,439 tokens to every session, about $0.0058 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.
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.
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.
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).