cosscom/coss is the official Cal.com design system, providing reusable interface components and related applications for building its web experiences. It is organized as a TypeScript monorepo, meaning multiple apps and shared packages live and develop together in one repository.
Borrowing it
Nothing to install: this file belongs to cosscom/coss. 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/cosscom/coss/main/AGENTS.mdgit clone --depth 1 https://github.com/cosscom/cossWrote 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/cosscom/coss/agents-md)<a href="https://agentmods.dev/instructions/cosscom/coss/agents-md"><img src="https://agentmods.dev/badge/instructions/cosscom/coss/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/cosscom/coss/agents-md"><img src="https://agentmods.dev/badge/instructions/cosscom/coss/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 | $0.32561 | $0.32561 |
| Opus 5.5 | $0.13024 | $0.13024 |
| Sonnet 5.5 | $0.06512 | $0.06512 |
| Haiku 4.5 | $0.03256 | $0.03256 |
Grade A, and why
coss 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.
The source is not reproduced here
Licensed AGPL-3.0
The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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 Changed · +5 lines · +512 tokens per session 8d228459d3c9
- 2d ago Changed · +7 lines · +520 tokens per session ca423c518fe3
- 3d ago Changed · -244 lines · -5,603 tokens per session scan C → A 9a7df0e4ea3b
- 4d ago Changed · +12 lines · +891 tokens per session c601aca3006c
- 5d ago Changed · +14 lines · +571 tokens per session f38e84e32a1e
- 7d ago Changed · +65 lines · +2,742 tokens per session 4a1a961c8cb9
- 8d ago Changed · +11 lines · +641 tokens per session ca6faf8608fe
- 9d ago Changed · +6 tokens per session 5f34a943cf4c
- 10d ago Changed · +14 lines · +1,011 tokens per session bdd3991912e6
- 11d ago First seen · 962 lines · 31,270 tokens per session scan C 8493275c249a
coss AGENTS.md is an instructions file published in the GitHub repository cosscom/coss (5 stars, last pushed yesterday), licensed AGPL-3.0. It adds 32,561 tokens to every session, about $0.1302 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.
coss AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| coss AGENTS.mdcosscom/coss | Instructions file | 5 | yesterday | AGPL-3.0 | A | 32,561 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |