Clean taint

Skill AntonioTimo/skillchecker/examples/clean-taint

paranoid auditor for Claude Code skills

Install

npx -y skills add AntonioTimo/skillchecker --skill clean-taint

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

One thing to look at

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What its author says it does

Copied from the file, not written here

Reads a couple of environment values and prepares local report structures. Demonstrates credential reads the taint pass should NOT flag.

SKILL.md

1.4 KB, 241 tokens by cl100k_base, as published. Nobody here has run it

Env Reporter

A safe helper. It reads environment values and builds local data structures, but never sends anything over the network — so there is no source→sink flow for the taint pass to flag.

Step 1 — Run

python3 ~/.claude/skills/env-reporter/scripts/client.py

Why this passes audit (negative test for the taint pass)

scripts/client.py exercises every guard that keeps the taint pass quiet:

A credential read that never reaches a network call (os.environ["HOME"] then print) — sink-reachability guard: a secret that goes nowhere is not a flow.
A credential passed only to a same-file, non-network helper — the pass is intraprocedural and the helper is not a sink, so nothing fires.
Non-credential values built and used locally — no source, no sink.

There is no requests / httpx / urllib call anywhere, so neither HI009 nor any TF rule fires.