pi-skillopt

pi-skillopt is a skill for Claude Code, Codex from mitkox/SkillOpt. It costs 59 tokens per session (1,060 once invoked), scanned A, original, MIT.

A set of operating instructions for running SkillOpt, evaluating skills, using its local model, and extending its benchmarks or backends.

In plain words
What is it for?
Use it to train or evaluate a skill, inspect experiment results, configure the local model, or add benchmarks and backends.
Why use it?
It gives the agent the repository-specific settings and workflow needed to run small, controlled experiments before larger ones.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is python3 scripts/train.py \.

Good fit Use it to train or evaluate a skill, inspect experiment results, configure the local model, or add benchmarks and backends.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/mitkox/SkillOpt
agentmods
npx agentmods add skills/mitkox/skillopt/pi-skillopt

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for pi-skillopt

README.md
[![agentmods](https://agentmods.dev/badge/skills/mitkox/skillopt/pi-skillopt/github.svg)](https://agentmods.dev/skills/mitkox/skillopt/pi-skillopt)
Your own site
<a href="https://agentmods.dev/skills/mitkox/skillopt/pi-skillopt"><img src="https://agentmods.dev/badge/skills/mitkox/skillopt/pi-skillopt/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.

agentmods 80×15 button for pi-skillopt

Your own site · 80×15
<a href="https://agentmods.dev/skills/mitkox/skillopt/pi-skillopt"><img src="https://agentmods.dev/badge/skills/mitkox/skillopt/pi-skillopt.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 59 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,060 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00059 $0.01060
Opus 5.5 $0.00024 $0.00424
Sonnet 5.5 $0.00012 $0.00212
Haiku 4.5 $0.00006 $0.00106

Measured 2mo ago against content hash 53f525e9f9fd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

pi-skillopt 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 2mo 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.

.github/skills/pi-skillopt/SKILL.md · 124 lines

How it starts

The opening of the file, as written. The whole thing — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.

PI SkillOpt Operator

Use this skill when the user wants the agent to operate the SkillOpt repository: run experiments, evaluate skills, configure local models, inspect outputs, or extend the repo with new benchmarks/backends.

Core repo facts

  • SkillOpt optimizes a skill document / system prompt, not model weights.
  • The repo supports a generic local OpenAI-compatible backend named openai_compat.
  • The local example model config is configs/dotnetdebug/local_mitko.yaml.
  • That config uses model mitko at http://localhost:8000/v1 for both optimizer and target.
  • The runnable sample benchmark is dotnetdebug.
  • The sample dataset is data/dotnetdebug/tasks.json.
  • The seed skill is skillopt/envs/dotnetdebug/skills/initial.md.
  • Training entry point: scripts/train.py.
  • Eval-only entry point: scripts/eval_only.py.

Default workflow

  1. Identify the user goal:
    • run a SkillOpt training job
    • evaluate an existing skill
    • inspect outputs from a previous run
    • add or modify a benchmark
    • add or modify a backend
  2. Confirm the benchmark, backend, target model, and desired output directory.
  3. Prefer a small smoke test first before a larger run.
  4. Use existing configs when possible instead of inventing new ones.
  5. After a run, report:
    • exact command used
    • output directory
    • best skill path
    • headline metrics
    • next recommended action

Local model workflow

When the user asks to use a local model or mentions mitko, localhost:8000, or an OpenAI-compatible endpoint:

  • Prefer model.backend: openai_compat.
  • Set both optimizer_backend and target_backend to openai_compat unless the user explicitly wants a mixed setup.
  • Use configs/dotnetdebug/local_mitko.yaml when the task is the built-in dotnet debugging example.
  • Keep smoke tests small, for example:
    • train.num_epochs=1
    • train.batch_size=2
    • gradient.analyst_workers=1
    • gradient.minibatch_size=2
    • env.workers=1
    • env.limit=2

Read the full file on GitHub · 124 lines

Changes

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.

  1. 2mo ago First seen · 124 lines · 59 tokens per session scan A 53f525e9f9fd

Subscribe to this mod's changes

pi-skillopt is a skill published in the GitHub repository mitkox/SkillOpt (86 stars, last pushed 5mo ago), licensed MIT. It adds 59 tokens to every session and 1,060 once invoked, about $0.0002 per session on Opus 5.5. 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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