OpenCode is an open-source AI coding agent that helps developers work on software projects. It includes agents for full-access development, read-only exploration and planning, plus a general subagent for complex searches and multistep tasks; the catalogue add-ons extend its workflows.
Borrowing it
Nothing to install: this file belongs to anomalyco/opencode. 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/anomalyco/opencode/dev/AGENTS.mdgit clone --depth 1 https://github.com/anomalyco/opencodeWrote 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/anomalyco/opencode/agents-md)<a href="https://agentmods.dev/instructions/anomalyco/opencode/agents-md"><img src="https://agentmods.dev/badge/instructions/anomalyco/opencode/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/anomalyco/opencode/agents-md"><img src="https://agentmods.dev/badge/instructions/anomalyco/opencode/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 | $0.03035 | $0.03035 |
| Opus 5.5 | $0.01214 | $0.01214 |
| Sonnet 5.5 | $0.00607 | $0.00607 |
| Haiku 4.5 | $0.00303 | $0.00303 |
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 today.
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, 64 lines differ
How it starts
The opening of the file, as written. The whole thing — 190 lines — stays where its author put it; the contents beside it link to each section on GitHub.
- After changing the public Protocol or Server
HttpApi, runbun run generatefrompackages/client. Do not edit generated client files directly. - 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;
sdkcomposes Client, Core, and Server. - This repository does not use Changesets. Do not add
.changesetfiles; follow the existing release workflow instead. - The default branch is
dev. Base branches and worktrees onorigin/dev, target PRs atdev, and diff againstorigin/devunless told otherwise.
Live TUI Testing
- Run
bun run dev:livefrom a development worktree to test its TUI against the currently electedopencodebackground server and live sessions. - Pass a directory after the script when needed, for example
bun run dev:live /path/to/project. - The script discovers the server with
opencode service status, injects its private local credential fromopencode service get password, and uses thedevTUI storage channel so tabs and other client-local state match the installed client. - Prefer
dev:liveover plainbun run devfor this workflow. An implicit managed-service connection may replace the live server when the worktree client version differs; explicit--serverwarns and continues without replacing it.
TUI Stories
- When a user asks for a TUI story, add a fixture-driven story under
packages/tui/src/feature-plugins/system/storybookand register it inindex.tsx. - Render the real production component rather than a visual copy. Keep submissions and other side effects local to the story so it is safe to explore repeatedly.
- Expose the meaningful state dimensions through story keybindings and list them in
StoryFooter; include a reset command when combinations can leave the fixture in a confusing state. - Run a specific story with
OPENCODE_STORY=<story-id> bun run dev:livefrom the development worktree, and exercise narrow and wide terminal sizes when layout is relevant.
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.
- today Changed · +2 lines · +194 tokens per session 8cb2aa508cab
- 7d ago Changed · +1 lines · +79 tokens per session 852b83cc3412
- 10d ago Changed · -6 lines · -413 tokens per session aca6c6c62ae6
- 12d ago Changed · +31 lines · +1,282 tokens per session d4048f323695
- 1mo ago 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 (220,205 stars, last pushed today), licensed MIT. It adds 3,035 tokens to every session, about $0.0121 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).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.