Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/anomalyco/opencode/agents-mdgit clone --depth 1 https://github.com/anomalyco/opencodeWhat 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 | $0.01893 | $0.01893 |
| Opus 5 | $0.00946 | $0.00946 |
| Sonnet 5 | $0.00379 | $0.00379 |
| Haiku 4.5 | $0.00189 | $0.00189 |
Grade A, and why
opencode 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 yesterday.
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.
Copies of this mod
1 near-identical copy found in the catalogue:
- pentestcode AGENTS.md — 97% identical, 2 lines differ
How it starts
The opening of the file, as written. The whole thing — 162 lines — stays where its author put it; the contents beside it link to each section on GitHub.
- To regenerate the legacy JavaScript SDK, run
./packages/sdk/js/script/build.ts. - After changing the public Protocol or Server
HttpApi, runbun run generatefrompackages/client. Do not editsrc/generatedorsrc/generated-effectdirectly. - Keep runtime dependencies directed from Schema to Core and Protocol, then from Core and Protocol to Server. Client runtime code may depend on Schema and Protocol but never Core or Server;
sdk-nextcomposes Client, Core, and Server. - The default branch in this repo is
dev. - Local
mainref may not exist; usedevororigin/devfor diffs.
Branch Names
Use a short branch name of at most three words, separated by hyphens. Do not use slashes or type prefixes such as feat/ or fix/.
Examples: session-recovery, fix-scroll-state, regenerate-sdk.
Commits and PR Titles
Use conventional commit-style messages and PR titles: type(scope): summary.
Valid types are feat, fix, docs, chore, refactor, and test. Scopes are optional; use the affected package or area when helpful, e.g. core, opencode, tui, app, desktop, sdk, or plugin.
Examples: fix(tui): simplify thinking toggle styling, docs: update contributing guide, chore(sdk): regenerate types.
Style Guide
General Principles
- Keep things in one function unless composable or reusable
- Do not extract single-use helpers preemptively. Inline the logic at the call site unless the helper is reused, hides a genuinely complex boundary, or has a clear independent name that improves the caller.
- Avoid
try/catchwhere possible - Avoid using the
anytype - Use Bun APIs when possible, like
Bun.file() - Rely on type inference when possible; avoid explicit type annotations or interfaces unless necessary for exports or clarity
- Prefer functional array methods (flatMap, filter, map) over for loops; use type guards on filter to maintain type inference downstream
- In
src/config, follow the existing self-export pattern at the top of the file (for exampleexport * as ConfigAgent from "./agent") when adding a new config module. - In Effect generators, bind services to named variables before calling methods. Do not use nested service yields such as
yield* (yield* Foo.Service).bar().
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.
- yesterday First seen · 162 lines · 1,893 tokens per session scan A 1c9b877668f7
opencode AGENTS.md is an instructions file published in the GitHub repository anomalyco/opencode (202,755 stars, last pushed today), licensed MIT. It adds 1,893 tokens to every session, about $0.0095 per session on Opus 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
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
buildNext
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
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, applying the notice (cutover) and fallback chain (never fail the build).
spec-kit AGENTS.md
Instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
langchain 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.