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 PaulRBerg/agent-skills --skill effect-tsgit clone --depth 1 https://github.com/PaulRBerg/agent-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/paulrberg/agent-skills/effect-ts)<a href="https://agentmods.dev/skills/paulrberg/agent-skills/effect-ts"><img src="https://agentmods.dev/badge/skills/paulrberg/agent-skills/effect-ts/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/paulrberg/agent-skills/effect-ts"><img src="https://agentmods.dev/badge/skills/paulrberg/agent-skills/effect-ts.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk warn
- 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 | $0.00056 | $0.00923 |
| Opus 5 | $0.00028 | $0.00462 |
| Sonnet 5 | $0.00011 | $0.00185 |
| Haiku 4.5 | $0.00006 | $0.00092 |
Grade A, and why
effect-ts 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 9d 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 — 78 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Effect 3
Apply Effect 3 semantics from project-local architecture, the narrowest relevant reference, and source matching the target's installed packages.
Workflow
Do not activate this workflow merely because a file imports effect. For nontrivial Effect work:
- Resolve the target package or workspace and its exact installed
effectand relevant@effect/*versions. Ifeffectis not 3.x, stop because this skill does not apply. - Inspect neighboring services, layers, errors, schemas, runtime boundaries, and tests. Local conventions decide organization; installed package evidence decides API facts.
- Read
references/critical-rules.md, then only the task-specific references below. - Verify every uncertain import, signature, or behavior against the package installation visible to the target workspace before editing.
- Implement the smallest pattern consistent with the project and run the narrowest test or typecheck covering the changed semantics.
Evidence Order
Use the target workspace's manifest and lockfile to identify versions. Prefer, in order:
- the installed package's
src/, README, tests, and changelog; - its emitted declarations when source is not shipped;
- the matching official package artifact or source tag.
Do not install or update dependencies solely to obtain documentation. Do not trust an unrelated checkout or a source branch that does not match the target's installed version. If exact behavior cannot be verified, stop rather than guessing.
Reference Router
| Task | Reference |
|---|---|
Services, Layers, tags, Effect.fn |
references/services-layers.md |
| Config providers and secrets | references/config.md |
| Schema, JSON Schema, encoded errors/models | references/schema-jsonschema.md |
@effect/vitest, clocks, fibers, retries |
references/testing.md |
| resources, scheduling, refs, concurrency | references/runtime.md |
| streams and backpressure | references/streams.md |
| pattern matching and tagged unions | references/pattern-matching.md |
@effect/ai |
references/ai.md |
@effect/sql |
references/sql.md |
Next.js / @prb/effect-next |
references/next-js.md |
| Effect Atom | references/effect-atom.md |
Option at nullable boundaries |
references/option-null.md |
What ships with it
14 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/openai.yaml 42 B
- references/ai.md 1.3 KB
- references/config.md 1.1 KB
- references/critical-rules.md 2.7 KB
- references/effect-atom.md 1.6 KB
- references/next-js.md 1.9 KB
- references/option-null.md 897 B
- references/pattern-matching.md 835 B
- references/runtime.md 1.3 KB
- references/schema-jsonschema.md 1.9 KB
- references/services-layers.md 2.3 KB
- references/sql.md 1.1 KB
- references/streams.md 1.2 KB
- references/testing.md 1.7 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.
- 9d ago First seen · 78 lines · 56 tokens per session scan A 1cc94ce5aa8b
effect-ts is a skill published in the GitHub repository PaulRBerg/agent-skills (70 stars, last pushed yesterday), licensed MIT. It adds 56 tokens to every session and 923 once invoked, about $0.0003 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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