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 jiatastic/open-python-skills --skill ty-skillsgit clone --depth 1 https://github.com/jiatastic/open-python-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/jiatastic/open-python-skills/ty-skills)<a href="https://agentmods.dev/skills/jiatastic/open-python-skills/ty-skills"><img src="https://agentmods.dev/badge/skills/jiatastic/open-python-skills/ty-skills/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/jiatastic/open-python-skills/ty-skills"><img src="https://agentmods.dev/badge/skills/jiatastic/open-python-skills/ty-skills.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00104 | $0.00944 |
| Opus 5.5 | $0.00042 | $0.00378 |
| Sonnet 5.5 | $0.00021 | $0.00189 |
| Haiku 4.5 | $0.00010 | $0.00094 |
Grade A, and why
ty-skills 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.
How it starts
The opening of the file, as written. The whole thing — 131 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ty-skills
Master Python type checking with ty - the extremely fast type checker written in Rust by Astral (creators of uv and Ruff).
When to Use This Skill
- Adding type annotations to Python code
- Fixing type errors and diagnostics from ty
- Configuring ty rules and severity levels
- Migrating from mypy or pyright to ty
- Understanding advanced type patterns (intersection types, protocols, generics)
- Setting up ty language server in your editor
Quick Start
# Install
uv tool install ty
# or: pip install ty
# Check current directory
ty check
# Check specific files
ty check src/
# Full diagnostics
ty check --output-format full
Configuration
Configure via pyproject.toml:
[tool.ty.environment]
python-version = "3.12"
python = "./.venv"
python-platform = "linux"
root = ["./src"]
extra-paths = ["./typings"]
[tool.ty.rules]
# error: fail CI, warn: report, ignore: disable
possibly-unresolved-reference = "error"
invalid-argument-type = "error"
division-by-zero = "warn"
unused-ignore-comment = "warn"
[tool.ty.src]
include = ["src", "tests"]
exclude = ["src/migrations/"]
# Per-file overrides
[[tool.ty.overrides]]
include = ["tests/**"]
[tool.ty.overrides.rules]
possibly-unresolved-reference = "warn"
Rules Quick Reference
| Rule | Default | Description |
|---|---|---|
possibly-unresolved-reference |
error | Variable might not be defined |
invalid-argument-type |
error | Argument type mismatch |
incompatible-assignment |
error | Assigned value incompatible |
missing-argument |
error | Required argument missing |
unsupported-operator |
error | Operator not supported for types |
invalid-return-type |
error | Return type mismatch |
division-by-zero |
warn | Potential division by zero |
unused-ignore-comment |
warn | Suppression not needed |
redundant-cast |
warn | Cast has no effect |
possibly-unbound-attribute |
warn | Attribute might not exist |
index-out-of-bounds |
warn | Index might be out of range |
What ships with it
8 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.
- references/advanced_patterns.md 10 KB
- references/common_errors.md 7.6 KB
- references/editor_setup/cursor.md 3.6 KB
- references/editor_setup/neovim.md 5.5 KB
- references/editor_setup/vscode.md 3.6 KB
- references/migration_guide.md 8.1 KB
- references/ty_rules_reference.md 6.4 KB
- references/typing_cheatsheet.md 6.8 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.
- 2mo ago First seen · 131 lines · 104 tokens per session scan A 865d747c55cd
ty-skills is a skill published in the GitHub repository jiatastic/open-python-skills (10 stars, last pushed 9mo ago), licensed MIT. It adds 104 tokens to every session and 944 once invoked, about $0.0004 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 2026-08-31.
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