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/kws-projects/react-boilerplate/evolving-conventionsgit clone --depth 1 https://github.com/kws-projects/react-boilerplateWhat 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 | $0.00323 | $0.00323 |
| Opus 5 | $0.00161 | $0.00161 |
| Sonnet 5 | $0.00065 | $0.00065 |
| Haiku 4.5 | $0.00032 | $0.00032 |
Grade A, and why
evolving-conventions 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 yesterday.
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
Evolving Conventions
When a new project-wide convention, requirement, or recurring pattern is introduced or changed (e.g. file layout, naming, testing, tooling, integration patterns), update the documentation in the same change - do not leave it implicit in code only.
What to update
.cursor/rules/- update the relevant rule (e.g.project-structure,best-practices,maintaining-boilerplate) so future agents follow it..cursor/skills/- update the relevant skill, or add a new one when a workflow is involved (multi-step, repeatable, or with gotchas).README.md- update if the change affects how a human sets up, runs, or maintains the project.
When to create a new rule or skill
Prefer editing an existing rule/skill. Create a new one only when it clearly improves readability or management - i.e. the topic is self-contained and would bloat or muddy an existing file. Keep each rule focused and concise; keep skills action-oriented with clear steps.
Consistency
- Apply the new convention to existing code where reasonable, not just new code.
- Keep rules, skills, and README in agreement; if they conflict, fix all of them.
- Avoid duplicating the same guidance across files - state it once and reference it (e.g. point to a skill from a rule).
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.
- yesterday First seen · 35 lines · 323 tokens per session scan A f003550e52a4
evolving-conventions is a cursor rule published in the GitHub repository kws-projects/react-boilerplate (3 stars, last pushed 2mo ago), licensed MIT. It adds 323 tokens to every session, about $0.0016 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 2026-08-31.
Other cursor rules, from other repositories
library-conventions
React Native library conventions for this starter. Apply when creating or editing components, hooks, types, or tests in src/.
design
Design system, accessibility standards, and industry-specific styling guidelines.
services
Service layer architecture, API patterns, and data management with TanStack Query.
components
Component development patterns and composition rules.
quality
Code quality checklist and anti-patterns to avoid before shipping.
typescript
TypeScript type definitions and utility patterns for the application.