skill-posidoni-shell-skill-streams · by Install
$ agentstack add skill-posidoni-shell-skill-streams ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-posidoni-shell-skill-streams) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
Streams
fd 0 is stdin, fd 1 is stdout (data), fd 2 is stderr (diagnostics). Depth and citations in [reference/streams.md](../../reference/streams.md); runnable pairs in [examples/streams/](../../examples/streams/).
Rules at a glance
| Rule | Why | Code | |------|-----|------| | Diagnostics and prompts to stderr (>&2); data to stdout | keeps stdout pipeable and parseable | review-only | | Signal failure with a non-zero exit, not just a message | callers test the exit status | — | | Read lines with while IFS= read -r line | preserves whitespace and backslashes | — | | Don't loop over $(cat file) | it word-splits and globs | SC2013 | | cmd >file 2>&1, not cmd 2>&1 >file | 2>&1 copies stdout's target at that moment | SC2069 | | Quote the delimiter (<<'EOF') to stop expansion | literal here-doc | — | | Never read and write the same file in one pipeline | the target is truncated first | — | | $(...) strips trailing newlines | guard with a sentinel when they matter | — |
Note
ShellCheck catches SC2013 and SC2069, but not a diagnostic sent to stdout instead of stderr — that one is enforced by review. A green lint does not mean the streams are right.
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: posidoni
- Source: posidoni/shell-skill
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.