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 agentmods add rules/bugbasesecurity/pentest-copilot/shell-tilde-pathsgit clone --depth 1 https://github.com/bugbasesecurity/pentest-copilotWhat 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 | $0.00000 | $0.00258 |
| Opus 5 | $0.00000 | $0.00129 |
| Sonnet 5 | $0.00000 | $0.00052 |
| Haiku 4.5 | $0.00000 | $0.00026 |
Grade A, and why
shell-tilde-paths scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Shell Path Handling: ~ Does Not Expand in Quotes
WORKSPACE_DIR is ~/pentest-workspace. When constructing shell commands that reference file paths:
~is not expanded by bash inside double quotes:stat "~/foo"fails (looks for literal~directory)$HOMEis expanded inside double quotes:stat "$HOME/foo"works correctly
Always replace a leading ~ with $HOME before interpolating paths into quoted shell commands:
// ✅ GOOD
const resolved = rawPath.replace(/^~(?=\/|$)/, "$HOME");
await ctx.runCommand(`stat -c %s "${resolved}"`);
// ❌ BAD — ~ won't expand inside double quotes
await ctx.runCommand(`stat -c %s "${rawPath}"`);
// ❌ BAD — unquoted path breaks on spaces
await ctx.runCommand(`stat -c %s ${rawPath}`);
This applies to any tool handler that takes a user/agent-supplied file path and passes it to ctx.runCommand.
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.
- 2d ago First seen · 29 lines · 0 tokens per session scan A 44e04dbeb0a4
shell-tilde-paths is a cursor rule published in the GitHub repository bugbasesecurity/pentest-copilot (1,340 stars, last pushed 18d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 258 tokens. 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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