Skill/Static safety grade

gem-miner

github/BankrBot/skills#gem-miner

litmus-skill-v2 · 2026-06-25

graded at commit 65e9a9e · 2026-06-17

The gem-miner skill is graded A by polygraph under litmus-skill-v2, as of 2026-06-25, anchored to its content hash.

Self-reported “Stake $GEM tokens on Gem Miner (gemminer.app) to earn yield and unlock the in-game earn/cashout system. Use when the user wants to stake GEM, check their staking balance or rewards, unstake, claim rewards, or check whether they meet the 25M GEM gate. Base mainnet only.” — the skill’s own SKILL.md description at the graded commit, not part of the grade.

A static safety grade — a deterministic scan of the skill’s SKILL.md and bundled files. An A means static-clean, not behavioral proof: a skill’s instructions are interpreted by an agent at runtime.

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S-01 Prompt-injection / context-poisoningpass

S-03 Data-exfiltration instructionspass

S-04 Dangerous bundled commandspass

no bundled executable scripts

content hash · 0x840c5703a2…bfdc

Source · github.com/BankrBot/skills/tree/main/gem-miner

Watch for changes

This grade is a snapshot of the skill’s files at one commit. Get an email when a new commit changes gem-miner and polygraph re-runs the litmus — one message per change, one-click unsubscribe.

Monitor this skill

Reproduce this grade

The skill litmus is open and deterministic. Point it at the skill directory and compare the grade and content hash — a false grade is falsifiable, not merely disputable.

npx -p @polygraphso/litmus polygraphso-litmus-skill <skill-dir>

Embed this badge

Drop it in the skill’s README, docs, or listing. It always shows the current grade and links back here.

Markdown — badge

[![polygraph](https://www.polygraph.so/api/badge/skill?skill=github/BankrBot/skills/gem-miner)](https://www.polygraph.so/skill/github/BankrBot/skills/gem-miner)

HTML — badge

<a href="https://www.polygraph.so/skill/github/BankrBot/skills/gem-miner"><img src="https://www.polygraph.so/api/badge/skill?skill=github/BankrBot/skills/gem-miner" alt="polygraph grade"></a>

Markdown — card

[![polygraph](https://www.polygraph.so/api/badge/skill/card?skill=github/BankrBot/skills/gem-miner)](https://www.polygraph.so/skill/github/BankrBot/skills/gem-miner)

Questions

What does the A skill grade mean for gem-miner?: It’s a static safety grade(A/B/D/F) from a deterministic scan of the skill’s SKILL.md and bundled files. An A means static-clean — not behavioral proof, since a skill’s instructions are interpreted by an agent at runtime.
What did polygraph check?: Three static checks: S-01 prompt-injection and context-poisoning, S-03 data-exfiltration instructions, and S-04 dangerous bundled commands. The full battery is in the methodology.
How do I reproduce this grade?: Run npx -p @polygraphso/litmus polygraphso-litmus-skill <skill-dir>. The scan is open and deterministic, anchored to the skill’s content hash, so the same directory yields the same grade.