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 agentmods add rules/featurefactory-io/mimir/do-skeletons-firstgit clone --depth 1 https://github.com/FeatureFactory-io/mimirWhat 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 | $0.00000 | $0.00161 |
| Opus 5 | $0.00000 | $0.00081 |
| Sonnet 5 | $0.00000 | $0.00032 |
| Haiku 4.5 | $0.00000 | $0.00016 |
Grade A, and why
do-skeletons-first 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 3d 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
The core principle is that the developer who has no knowledge of the system can implement methods/properties etc. following only documentation in the skeleton - think its like you are a designer defining the task for the implementer.
Do as follows:
- Read
.windsurf/rules/do-write-concise-methods.md - Read .windsurf/rules/keep-docstrings-consistent.md
- Create class and method/function stubs and document them
- Include full docstrings, return types (eg "-> list[str]", and sample return values (per global rules)
- Use
raise NotImplementedError()in each method. - Do not skip type hints or documentation
- Add comments inside the methods pointing attention to the logic flow, exception handling, logging etc.
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.
- 3d ago First seen · 15 lines · 0 tokens per session scan A 75f49c4ecc7f
do-skeletons-first is a cursor rule published in the GitHub repository FeatureFactory-io/mimir (13 stars, last pushed 5d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 161 tokens. 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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