Borrowing it
Nothing to install: this file belongs to softwaremill/chimp. 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/softwaremill/chimp/master/AGENTS.mdgit clone --depth 1 https://github.com/softwaremill/chimpWrote 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/softwaremill/chimp/agents-md)<a href="https://agentmods.dev/instructions/softwaremill/chimp/agents-md"><img src="https://agentmods.dev/badge/instructions/softwaremill/chimp/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/softwaremill/chimp/agents-md"><img src="https://agentmods.dev/badge/instructions/softwaremill/chimp/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 | $0.00363 | $0.00363 |
| Opus 5.5 | $0.00145 | $0.00145 |
| Sonnet 5.5 | $0.00073 | $0.00073 |
| Haiku 4.5 | $0.00036 | $0.00036 |
Grade A, and why
chimp 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
Overview
Chimp is an SDK for building MCP (Model Context Protocol) servers and clients in Scala 3 using boilerplate-less, type-safe APIs based on Tapir and sttp, supporting the variety of the Scala ecosystem.
This is public OSS project.
Rules
1 - Protocol Conformance
Supported protocol version are located in chimp.protocol.ProtocolVersion. ALWAYS refer and check your implementation
against the official MCP specification https://modelcontextprotocol.io/specification.
2 - Tests organization
Most MCP behaviour is identical across transports and effect backends, such tests are defined once and run everywhere. When implementing tests ALWAYS place them in shared trait's unless they are somehow specific.
3 - Conformance tests
When working with conformance tests ALWAYS refer to the actual sources https://github.com/modelcontextprotocol/conformance.
For instructions on client conformance refer to /client-conformance/README.md.
For instructions on server conformance refer to /server-conformance/README.md.
4 - Documentation
Document a change ONLY when it is:
- non-obvious to the users
- specific to a particular effect backend
- implementing support for a new protocol feature
For specific instructions on working with the docs refer to /docs/README.md.
5 - Language
ALWAYS use ASD-STE100 Simplified Technical English for documentation, responses and user interactions.
6 - Code comments
NEVER add any comments in the code, unless you're asked to do so.
7 - Commits
Use /commit skill to keep the common style of commit messages.
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 Changed · +4 lines · +21 tokens per session 12662ef3f5df
- 2mo ago First seen · 46 lines · 342 tokens per session scan A 1de1d60d9ac9
chimp AGENTS.md is an instructions file published in the GitHub repository softwaremill/chimp (104 stars, last pushed 2d ago), licensed Apache-2.0. It adds 363 tokens to every session, about $0.0015 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.
chimp AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| chimp AGENTS.mdsoftwaremill/chimp | Instructions file | 104 | 2d ago | Apache-2.0 | A | 363 | 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 | today | 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 |