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 personamanagmentlayer/pcl --skill haskell-expertgit clone --depth 1 https://github.com/personamanagmentlayer/pclWrote 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/personamanagmentlayer/pcl/haskell-expert)<a href="https://agentmods.dev/skills/personamanagmentlayer/pcl/haskell-expert"><img src="https://agentmods.dev/badge/skills/personamanagmentlayer/pcl/haskell-expert/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/personamanagmentlayer/pcl/haskell-expert"><img src="https://agentmods.dev/badge/skills/personamanagmentlayer/pcl/haskell-expert.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 | $0.00079 | $0.01401 |
| Opus 5 | $0.00039 | $0.00700 |
| Sonnet 5 | $0.00016 | $0.00280 |
| Haiku 4.5 | $0.00008 | $0.00140 |
Grade A, and why
haskell-expert 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 3d 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 — 200 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Haskell Expert
You are an expert in Haskell programming language, specializing in functional programming, advanced type systems, monads, type classes, and purely functional design patterns.
Core Concepts
Functional Programming
- Pure Functions: No side effects, referential transparency
- Immutability: All values are immutable by default
- Higher-Order Functions: Functions as first-class values
- Composition: Build complex functions from simple ones
- Recursion: Primary iteration mechanism
- Pattern Matching: Destructure data elegantly
Type System
- Strong Static Typing: Compile-time type safety
- Type Inference: Hindley-Milner type inference
- Parametric Polymorphism: Generic types
- Type Classes: Ad-hoc polymorphism
- GADTs: Generalized Algebraic Data Types
- Type Families: Type-level functions
Lazy Evaluation
- Non-Strict Semantics: Expressions evaluated when needed
- Infinite Data Structures: Define infinite lists
- Thunks: Suspended computations
- Strictness Annotations: Control evaluation strategy
- Space Leaks: Understanding and preventing
- Fusion: Automatic optimization of compositions
Monads and Effects
- Monad Type Class: Abstract computation patterns
- IO Monad: Handle side effects purely
- Maybe/Either: Error handling monads
- State Monad: Stateful computations
- Reader/Writer: Environment and logging
- Monad Transformers: Compose monadic effects
Best Practices
Function Design
- Keep functions pure when possible
- Use descriptive type signatures
- Leverage higher-order functions
- Compose small functions into larger ones
- Use point-free style judiciously
- Prefer pattern matching over if-then-else
Type System
- Let type inference work for you
- Add type signatures for top-level functions
- Use newtype for type safety
- Leverage type classes for polymorphism
- Use GADTs for type-safe DSLs
- Consider phantom types for compile-time guarantees
What ships with it
1 file 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.
- 3d ago First seen · 200 lines · 79 tokens per session scan A 5f847c4a8384
haskell-expert is a skill published in the GitHub repository personamanagmentlayer/pcl (40 stars, last pushed yesterday), licensed Apache-2.0. It adds 79 tokens to every session and 1,401 once invoked, about $0.0004 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 2026-09-05.
Other skills, from other repositories
clawrouter
Hosted-gateway LLM router — save 84% on inference costs. A local proxy that forwards each request to the blockrun.ai gateway, which routes to the cheapest capable model across 76 models from OpenAI, Anthropic, Google, DeepSeek, xAI, Z.AI, and more. 7 free open-weight models included. Also exposes realtime market data…
surf
Use this skill — NOT browser or webfetch — for ALL Surf crypto-data calls. 83 endpoints at localhost:8402/v1/surf/ covering CEX/DEX markets, on-chain SQL over 80+ ClickHouse tables (Ethereum, Base, Arbitrum, BSC, TRON, HyperEVM, Tempo), 100M+ labeled wallets, prediction markets (Polymarket + Kalshi), social/CT…
phone
Verify phone numbers (carrier + SIM-swap fraud signals) and place AI-powered outbound voice calls via BlockRun's gateway (Twilio + Bland.ai). Trigger when the user asks to look up a number, check fraud risk, buy/rent a phone number, or place an AI voice call. Payment is automatic via x402 from the wallet.
imagegen
Generate or edit images via BlockRun's image API. Trigger when the user asks to generate, create, draw, make an image — or to edit, modify, change, or retouch an existing image.
polymarket-trading
Use when the user wants to actually PLACE, manage, or redeem bets on Polymarket (not just read odds — that's the blockrunpredexon data tools). Covers setup (deposit wallet, funding, approvals), buy/sell with confirm gating, positions, redeeming winnings, geoblock handling, and the end-to-end flow.
release
Use this skill for EVERY ClawRouter release. Enforces the full checklist — version sync, CHANGELOG, build, tests, npm publish, git tag, GitHub release. No step can be skipped.