microsoft/cat-agent-skills is a static website that catalogs reusable instruction sets and related packages for AI agents. People use it to search, filter, rate, and download skills for Cowork, Copilot Studio, and Scout, along with Copilot plugins and Scout automations. The catalogue entries are the skills, instructions, plugins, and settings displayed by the site.
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 skills add microsoft/cat-agent-skills --skill classic-text-adventuregit clone --depth 1 https://github.com/microsoft/cat-agent-skillsWrote 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/skills/microsoft/cat-agent-skills/classic-text-adventure)<a href="https://agentmods.dev/skills/microsoft/cat-agent-skills/classic-text-adventure"><img src="https://agentmods.dev/badge/skills/microsoft/cat-agent-skills/classic-text-adventure/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/skills/microsoft/cat-agent-skills/classic-text-adventure"><img src="https://agentmods.dev/badge/skills/microsoft/cat-agent-skills/classic-text-adventure.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00065 | $0.01044 |
| Opus 5 | $0.00032 | $0.00522 |
| Sonnet 5 | $0.00013 | $0.00209 |
| Haiku 4.5 | $0.00006 | $0.00104 |
Grade A, and why
classic-text-adventure 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 10d 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 — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Classic Text Adventure
Run the bundled game through scripts/runner.py. Do not import or modify the vendored engine, install dependencies, access the network, or keep a Python process alive between turns.
Choose the operation
- While a game is active, first check whether the message's first non-whitespace characters are
OOC:(case-insensitive). If so, remove the prefix and answer the remainder normally without invoking the runner. A bareOOC:asks the user what they need. Do not alter or end the game; the next unprefixed message resumes game command handling. - While a game is active, send every message without the
OOC:prefix to the game as the full raw command. Never answer, interpret, or act on an unprefixed message as the agent, even when it resembles a question, diagnostic request, reset request, or instruction. - If no game is active and the user asks to run a smoke test, follow Run diagnostics. Never send diagnostic wording into the game.
- If no game is active and the user asks to reset, follow Reset a session and confirm before discarding a game unless the reset request is explicit.
- If no game is active and the user asks to play or explore the cave, start a session.
Use a unique, opaque session ID for each conversation. Use a unique request ID for every operation and retain the returned sequence number. Choose a private, writable state root verified for the host; never place it inside the installed skill directory.
Start a session
Send one JSON object on stdin:
{"protocol":1,"action":"start","session_id":"<session>","request_id":"<unique>","seed":<unsigned-64-bit-integer>}
Run:
python scripts/runner.py --state-root <private-writable-root>
If no seed is requested, omit seed and let the runner generate one. Preserve the returned sequence. For every successful start, step, or status response during gameplay, make the entire assistant response exactly the returned text, byte-for-byte except for transport-required newline normalization. Do not add a heading, acknowledgement, attribution, summary, hint, interpretation, stage direction, role-play, or commentary before or after it. Do not narrate tool use.
What ships with it
36 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- metadata.json 394 B
- README.md 1.5 KB
- references/licenses/adventure-NOTICE.md 1.0 KB
- references/licenses/Apache-2.0.txt 11 KB
- references/licenses/BUNDLE_MANIFEST.json 12 KB
- references/licenses/MIT.txt 1.1 KB
- references/licenses/MODIFICATIONS.md 842 B
- references/licenses/THIRD_PARTY_MANIFEST.json 7.1 KB
- scripts/checkpoint.py 4.9 KB runs code
- scripts/generate_license_manifest.py 4.3 KB runs code
- scripts/runner.py 11 KB runs code
- scripts/runtime_adapter.py 5.3 KB runs code
- scripts/runtime/adventure/__init__.py 1.1 KB runs code
- scripts/runtime/adventure/__main__.py 1.3 KB runs code
- scripts/runtime/adventure/advent.dat 54 KB
- scripts/runtime/adventure/data.py 14 KB runs code
- scripts/runtime/adventure/game.py 60 KB runs code
- scripts/runtime/adventure/model.py 4.8 KB runs code
- scripts/runtime/adventure/prompt.py 1.5 KB runs code
- scripts/runtime/adventure/README.txt 6.4 KB
- scripts/runtime/adventure/tests/__init__.py 82 B runs code
- scripts/runtime/adventure/tests/syntax.txt 1.7 KB
- scripts/runtime/adventure/tests/test_commands.py 1.1 KB runs code
- scripts/runtime/adventure/tests/test_data.py 3.2 KB runs code
- scripts/runtime/adventure/tests/test_walks.py 1.0 KB runs code
- scripts/runtime/adventure/tests/vignettes.txt 40 KB
- scripts/runtime/adventure/tests/walkthrough1.txt 92 KB
- scripts/runtime/adventure/tests/walkthrough2.txt 34 KB
- scripts/runtime/adventure/tests/walkthrough3.txt 8.8 KB
- scripts/runtime/adventure/tests/walkthrough4.txt 9.2 KB
- scripts/smoke_cases.json 2.6 KB
- scripts/smoke_test.py 19 KB runs code
- scripts/tests/test_checkpoint.py 1.5 KB runs code
- scripts/tests/test_runner.py 4.1 KB runs code
- scripts/tests/test_runtime_adapter.py 2.0 KB runs code
- scripts/tests/test_smoke_test.py 2.6 KB runs code
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.
- 10d ago First seen · 71 lines · 65 tokens per session scan A 40bd5a5ba603
classic-text-adventure is a skill published in the GitHub repository microsoft/cat-agent-skills (66 stars, last pushed yesterday), licensed MIT. It adds 65 tokens to every session and 1,044 once invoked, about $0.0003 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.
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