Borrowing it
Nothing to install: this file belongs to sigilco/agentplugins. 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/sigilco/agentplugins/main/AGENTS.mdgit clone --depth 1 https://github.com/sigilco/agentpluginsWrote 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/sigilco/agentplugins/agents-md)<a href="https://agentmods.dev/instructions/sigilco/agentplugins/agents-md"><img src="https://agentmods.dev/badge/instructions/sigilco/agentplugins/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/sigilco/agentplugins/agents-md"><img src="https://agentmods.dev/badge/instructions/sigilco/agentplugins/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 | $0.00352 | $0.00352 |
| Opus 5.5 | $0.00141 | $0.00141 |
| Sonnet 5.5 | $0.00070 | $0.00070 |
| Haiku 4.5 | $0.00035 | $0.00035 |
Grade A, and why
agentplugins 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
GitHub Project is https://github.com/users/espetro/projects/14 .
Operating Principles
Tier-1 harnesses: Claude Code, Codex, OpenCode, Pi Mono. Tier-2: Copilot, Gemini, Kimi.
- Tier-1 parity is the bar. Every shipped capability must work across all four Tier-1 harnesses at the functionality level (not TUI level).
- Codegen first, guided per-harness fallback second. Universal codegen where possible; otherwise guide the author via the escape hatch rather than dropping the feature.
- Compat matrix is the contract.
docs/guide/capability-matrix.md— universal-codegen / guided-per-harness / unsupported, per harness. Keep it current. - Lean, no global SDK. Primitives express intent; each adapter owns its plumbing.
- Community plugins are ground-up rewrites in
agentplugins-<name>sibling repos (e.g.../agentplugins-caveman), not mechanical ports.
Full detail: prd.md
Commit & branch conventions
- Atomic conventional commits (
feat(adapter-pimono): fix subagentStop collision) - Feature work on
feat/*branches offdevelop; merge todevelop, then PRdevelop → mainto release - All plans in
.agents/plans/<date>-<purpose>.mdbefore implementation begins - All work linked to a refined issue in Project 14
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 First seen · 21 lines · 352 tokens per session scan A 0ac3ac8f2dde
agentplugins AGENTS.md is an instructions file published in the GitHub repository sigilco/agentplugins (11 stars, last pushed 20d ago), licensed Apache-2.0. It adds 352 tokens to every session, about $0.0014 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.
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.