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 pproenca/dot-skills --skill typescript-advanced-patternsgit clone --depth 1 https://github.com/pproenca/dot-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/pproenca/dot-skills/typescript-advanced-patterns)<a href="https://agentmods.dev/skills/pproenca/dot-skills/typescript-advanced-patterns"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/typescript-advanced-patterns/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/pproenca/dot-skills/typescript-advanced-patterns"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/typescript-advanced-patterns.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 | $0.00179 | $0.02174 |
| Opus 5 | $0.00089 | $0.01087 |
| Sonnet 5 | $0.00036 | $0.00435 |
| Haiku 4.5 | $0.00018 | $0.00217 |
Grade A, and why
typescript-advanced-patterns 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 6d 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 — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.
TypeScript Advanced Patterns Best Practices
Type-level programming, library-author idioms, and feature-implementation patterns that go beyond surface uses of TypeScript 5.x. Contains 40 rules across 5 categories, prioritised by impact on consumer codebases.
When to Apply
Reference these guidelines when:
- Designing a public library or DSL surface (fluent builders, event emitters, route parsers, query builders, schema-derived clients)
- Writing type-level algorithms (recursive conditionals, accumulator pattern, key remapping, variadic tuples, type-level string/number ops, type-level tests)
- Using TS 5.x features in non-trivial ways (Stage 3 decorators,
usingcomposition,const Tfor overload disambiguation,NoInferfor anchor-vs-constrained parameters, variance annotations, the bivariance hole) - Encoding workflow state, transitions, and capabilities at the type level so illegal states and missing checks are compile errors
- Integrating with the declaration & module system (module augmentation, declaration merging, ambient asset modules, library type publishing via
exports/typesVersions)
Boundary with neighbouring skills
| Skill | Don't reach for this skill if you need… |
|---|---|
typescript (curated) |
Compiler performance / tsconfig tuning |
typescript-refactor |
General refactoring patterns and modern-TS surface basics |
ts-google |
Google-style code style decisions |
clean-code-ts-react |
Clean-code principles (naming, function shape, abstraction) |
effect-ts / opencode-ts |
Effect library-specific patterns |
If a rule in this skill overlaps with one in typescript-refactor or .curated/typescript, the rule's Scope delta section names what this skill adds beyond the simpler version.
Rule Categories by Priority
| Priority | Category | Impact | Prefix | Rules |
|---|---|---|---|---|
| 1 | Library Author / DSL Patterns | CRITICAL | dsl- |
8 |
| 2 | Type-level Programming | HIGH | tlp- |
10 |
| 3 | Modern Features at Depth | HIGH | mod- |
8 |
| 4 | Feature Implementation Patterns | MEDIUM-HIGH | impl- |
8 |
| 5 | Declaration & Module System | MEDIUM | decl- |
6 |
What ships with it
44 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.
- AGENTS.md 12 KB
- assets/templates/_template.md 1.0 KB
- metadata.json 1.9 KB
- references/_sections.md 2.0 KB
- references/decl-ambient-asset-modules.md 3.5 KB
- references/decl-authoring-d-ts-for-js.md 4.1 KB
- references/decl-declaration-merging.md 4.1 KB
- references/decl-exports-and-types-versions.md 4.3 KB
- references/decl-global-augmentation-discipline.md 4.0 KB
- references/decl-module-augmentation.md 3.8 KB
- references/dsl-fluent-builder-phantom-state.md 3.4 KB
- references/dsl-narrow-api-surface.md 3.1 KB
- references/dsl-overloads-vs-conditional-returns.md 3.3 KB
- references/dsl-route-param-inference.md 2.8 KB
- references/dsl-schema-first-inference.md 3.1 KB
- references/dsl-type-safe-object-paths.md 3.0 KB
- references/dsl-type-safe-query-builder.md 3.1 KB
- references/dsl-typed-event-emitter.md 3.0 KB
- references/impl-assert-never-exhaustive.md 4.2 KB
- references/impl-env-config-loader.md 4.0 KB
- references/impl-finite-state-machine.md 4.3 KB
- references/impl-phantom-feature-flags.md 3.8 KB
- references/impl-schema-derived-api-client.md 4.3 KB
- references/impl-state-discriminated-union.md 3.8 KB
- references/impl-tagged-result-type.md 4.0 KB
- references/impl-type-safe-form-builder.md 3.7 KB
- references/mod-const-type-params-overloads.md 3.8 KB
- references/mod-method-vs-property-bivariance.md 3.8 KB
- references/mod-noinfer-overload-disambiguation.md 3.5 KB
- references/mod-phantom-capability-tracking.md 3.9 KB
- references/mod-satisfies-branded-config.md 4.0 KB
- references/mod-stage-3-decorators.md 4.0 KB
- references/mod-using-disposal-ordering.md 3.9 KB
- references/mod-variance-debugging.md 4.2 KB
- references/tlp-distributive-conditional-control.md 3.6 KB
- references/tlp-hkt-emulation.md 3.9 KB
- references/tlp-infer-extends-constraints.md 2.9 KB
- references/tlp-key-remapping-as.md 3.0 KB
- references/tlp-recursive-conditional-types.md 3.2 KB
- references/tlp-tail-recursion-accumulator.md 3.1 KB
- references/tlp-template-literal-pattern-matching.md 3.3 KB
- references/tlp-type-level-string-algorithms.md 3.5 KB
- references/tlp-type-level-tests.md 3.2 KB
- references/tlp-variadic-tuple-types.md 3.3 KB
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.
- 6d ago First seen · 114 lines · 179 tokens per session scan A 968982d4ebf7
typescript-advanced-patterns is a skill published in the GitHub repository pproenca/dot-skills (205 stars, last pushed 24d ago), licensed MIT. It adds 179 tokens to every session and 2,174 once invoked, about $0.0009 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 2026-09-03.
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