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 sablier-labs/plugin-marketplace --skill effect-tsgit clone --depth 1 https://github.com/sablier-labs/plugin-marketplaceWrote 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/sablier-labs/plugin-marketplace/effect-ts)<a href="https://agentmods.dev/skills/sablier-labs/plugin-marketplace/effect-ts"><img src="https://agentmods.dev/badge/skills/sablier-labs/plugin-marketplace/effect-ts.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00054 | $0.03843 |
| Opus 5 | $0.00027 | $0.01921 |
| Sonnet 5 | $0.00011 | $0.00769 |
| Haiku 4.5 | $0.00005 | $0.00384 |
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 7d 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 — 473 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Effect-TS Expert
Expert guidance for functional programming with the Effect library, covering error handling, dependency injection, composability, and testing patterns.
Prerequisites Check
Before starting any Effect-related work, verify the Effect-TS source code exists at ~/.effect.
If missing, stop immediately and inform the user. Clone it before proceeding:
git clone https://github.com/Effect-TS/effect.git ~/.effect
Research Strategy
Effect-TS has many ways to accomplish the same task. Proactively research best practices using the Task tool to spawn research agents when working with Effect patterns, especially for moderate to high complexity tasks.
Research Sources (Priority Order)
-
Codebase Patterns First — Examine similar patterns in the current project before implementing. If Effect patterns exist in the codebase, follow them for consistency. If no patterns exist, skip this step.
-
Effect Source Code — For complex type errors, unclear behavior, or implementation details, examine the Effect source at
~/.effect/packages/effect/src/. This contains the core Effect logic and modules.
When to Research
HIGH Priority (Always Research):
- Implementing Services, Layers, or complex dependency injection
- Error handling with multiple error types or complex error hierarchies
- Stream-based operations and reactive patterns
- Resource management with scoped effects and cleanup
- Concurrent/parallel operations and performance-critical code
- Testing patterns, especially unfamiliar test scenarios
MEDIUM Priority (Research if Complex):
- Refactoring imperative code (try-catch, promises) to Effect patterns
- Adding new service dependencies or restructuring service layers
- Custom error types or extending existing error hierarchies
- Integrations with external systems (databases, APIs, third-party services)
Research Approach
- Spawn multiple concurrent Task agents when investigating multiple related patterns
- Focus on finding canonical, readable, and maintainable solutions rather than clever optimizations
- Verify suggested approaches against existing codebase patterns for consistency (if patterns exist)
- When multiple approaches are possible, research to find the most idiomatic Effect-TS solution
What ships with it
6 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.
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.
- 7d ago First seen · 473 lines · 54 tokens per session scan A 83cf744de054
effect-ts is a skill published in the GitHub repository sablier-labs/plugin-marketplace (7 stars, last pushed 2mo ago), licensed MIT. It adds 54 tokens to every session and 3,843 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 2026-08-31.
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