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-write-concise-methodsgit 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 | $0.00247 | $0.00247 |
| Opus 5 | $0.00123 | $0.00123 |
| Sonnet 5 | $0.00049 | $0.00049 |
| Haiku 4.5 | $0.00025 | $0.00025 |
Grade A, and why
do-write-concise-methods 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 2d 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
Rule: Write Concise Methods
When designing new methods:
- Ensure the top-level (public) method is concise—ideally 20–30 lines maximum.
- Move all supporting logic and details into well-named private (or inner/helper) methods.
- The top-level method should clearly express the main workflow, delegating specifics to lower-level helpers.
Example:
class SomeObject:
def main_method(self, id):
# Inner/helper method for a single, focused operation
def _short_method(arg):
return op(arg)
target = self._get_target(_short_method(id))
result = self._do_magic_on(target)
return result
def _get_target(self, id):
# Implementation here
pass
def _do_magic_on(self, target):
# Implementation here
pass
Guidelines:
- Keep the top-level method readable and high-level—think of it as a summary of the operation.
- Each helper/private method should do one thing and have a clear, descriptive name.
- Avoid cramming complex logic into the top-level method; instead, encapsulate details in private helpers.
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.
- 2d ago First seen · 37 lines · 247 tokens per session scan A ba7198539fc2
do-write-concise-methods is a cursor rule published in the GitHub repository FeatureFactory-io/mimir (13 stars, last pushed 4d ago), licensed Apache-2.0. It adds 247 tokens to every session, about $0.0012 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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