Osaurus is a native macOS application that provides AI agents with memory, tools, autonomous execution, and identity around local or cloud models. It is used by people who want agents to run on their Mac, including fully offline with local models, and the catalogue entry contains an instruction and rule for working with it.
Borrowing it
Nothing to install: this file belongs to osaurus-ai/osaurus. 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/osaurus-ai/osaurus/main/AGENTS.mdgit clone --depth 1 https://github.com/osaurus-ai/osaurusWrote 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/osaurus-ai/osaurus/agents-md)<a href="https://agentmods.dev/instructions/osaurus-ai/osaurus/agents-md"><img src="https://agentmods.dev/badge/instructions/osaurus-ai/osaurus/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/osaurus-ai/osaurus/agents-md"><img src="https://agentmods.dev/badge/instructions/osaurus-ai/osaurus/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 | $0.03019 | $0.03019 |
| Opus 5.5 | $0.01208 | $0.01208 |
| Sonnet 5.5 | $0.00604 | $0.00604 |
| Haiku 4.5 | $0.00302 | $0.00302 |
Grade A, and why
osaurus 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.
How it starts
The opening of the file, as written. The whole thing — 219 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Codex Configuration - osaurus-staging
See ~/AGENTS.md for the global Codex environment, wiki protocol, hard rules,
machine context, and useful commands.
Build & Test
Running tests and builds is encouraged — they're how we keep quality high. The
canonical lanes live in Makefile:
make test—swift test --package-path Packages/OsaurusCore(fast unit loop).make ci-test— mirrors the CItest-corexcodebuild job (xcbeautifyoutput, xcresult bundle atbuild/Tests.xcresult).make cli/make app— build the CLI and the embedded app viaxcodebuildagainstosaurus.xcworkspace.make evals/make evals-all— run OsaurusEvals suites underPackages/OsaurusEvals/Suites/*.- Live-app smoke:
scripts/live-proof/launch-keychain-free-osaurus.sh.
Keychain tip (optional)
Some tests touch Osaurus Keychain wrappers. If a test doesn't need real Keychain access, prefer running it in keychain-disabled mode to avoid unrelated "wants to use your confidential information" prompts:
OSAURUS_DISABLE_KEYCHAIN_FOR_TESTS=1 \
OSAURUS_TEST_ROOT=/tmp/osaurus-test \
OSU_MODELS_DIR=/tmp/osaurus-test-models \
make test
In that mode, Keychain wrappers should return nil / no-op on reads, writes,
and deletes rather than calling SecItemCopyMatching / SecItemAdd /
SecItemUpdate / SecItemDelete against the login Keychain.
OSU_MODELS_DIR (pointed at an empty dir) matters on machines with real
models in ~/MLXModels: dispatch-style tests start real ChatSession.send
turns, and without the override they resolve the user's installed models and
try to load them inside the SwiftPM harness — which has no Metal kernels and
dies with MLX/MLXArray.swift precondition failed. With the override those
sends fail fast with modelUnavailable, matching CI behavior. Keychain-gated
suites (e.g. PluginAgentScopingTests) still fail by design under
OSAURUS_DISABLE_KEYCHAIN_FOR_TESTS=1; run those without the flag when you
need real Keychain proof.
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 · +24 lines · +296 tokens per session e7c2ab8fc1e7
- 1mo ago First seen · 195 lines · 2,723 tokens per session scan A d3c8d72c77cc
osaurus AGENTS.md is an instructions file published in the GitHub repository osaurus-ai/osaurus (8,077 stars, last pushed today), licensed MIT. It adds 3,019 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.
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.
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).