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/ssakone/crossrule/typescriptgit clone --depth 1 https://github.com/ssakone/crossruleWhat 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 | $0.00194 | $0.00194 |
| Opus 5 | $0.00097 | $0.00097 |
| Sonnet 5 | $0.00039 | $0.00039 |
| Haiku 4.5 | $0.00019 | $0.00019 |
Grade A, and why
typescript 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
TypeScript Development Rules
Core Configuration
- Use strict TypeScript configuration with all strict mode options enabled
- Target ES2020 for broad compatibility while maintaining modern features
- Enable
noUncheckedIndexedAccessto catch potential undefined access - Use
exactOptionalPropertyTypesfor precise optional property handling
Type Definitions
- Prefer interfaces over type aliases for object shapes and contracts
- Use type aliases for union types, computed types, and complex type expressions
- Always provide explicit return types for public functions and methods
- Avoid
anytype except for gradual migration from JavaScript
Code Organization
- Group related types and interfaces in dedicated type definition files
- Use barrel exports (index.ts) to create clean import paths
- Implement proper module boundaries and avoid circular dependencies
- Follow consistent naming conventions: PascalCase for types, camelCase for functions
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 · 24 lines · 194 tokens per session scan A db6a262ecc72
typescript is a cursor rule published in the GitHub repository ssakone/crossrule (4 stars, last pushed 11mo ago), licensed MIT. It adds 194 tokens to every session, about $0.0010 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.
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