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 skills/maxvaega/skillkit/edge-special-charsnpx skills add maxvaega/skillkit --skill edge-special-charsgit clone --depth 1 https://github.com/maxvaega/skillkitWrote 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/maxvaega/skillkit/edge-special-chars)<a href="https://agentmods.dev/skills/maxvaega/skillkit/edge-special-chars"><img src="https://agentmods.dev/badge/skills/maxvaega/skillkit/edge-special-chars.svg" alt="Measured on agentmods" 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 | $0.00015 | $0.00186 |
| Opus 5 | $0.00008 | $0.00093 |
| Sonnet 5 | $0.00003 | $0.00037 |
| Haiku 4.5 | $0.00002 | $0.00019 |
Grade B, and why
special-chars-skill scanned grade B with 1 finding 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 5d 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.
Recursive force deletemediumDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
- Command injection: ; rm -rf / ; $(whoami) Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
What it actually says
Special Characters Skill
This skill tests handling of special characters in $ARGUMENTS placeholder.
Test cases covered:
- HTML/XML special chars: < > & " '
- Shell metacharacters: $ ` ; | & ( ) [ ] { }
- Path traversal attempts: ../ ../../etc/passwd
- SQL injection patterns: ' OR '1'='1
- Command injection: ; rm -rf / ; $(whoami)
- Unicode and emoji: 你好 🎉 émoji
Usage: $ARGUMENTS
Expected Behavior
The ContentProcessor should safely substitute arguments without:
- Executing shell commands
- Interpreting special characters
- Allowing path traversal
- Enabling injection attacks
All input should be treated as literal text.
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.
- 5d ago First seen · 30 lines · 15 tokens per session scan B 80862a45b03f
special-chars-skill is a skill published in the GitHub repository maxvaega/skillkit (147 stars, last pushed 7mo ago), licensed MIT. It adds 15 tokens to every session and 186 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it B with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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