Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add malob/nix-config/plugin install pua-unicodeWrote 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/malob/nix-config/icon-lookup)<a href="https://agentmods.dev/skills/malob/nix-config/icon-lookup"><img src="https://agentmods.dev/badge/skills/malob/nix-config/icon-lookup/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/malob/nix-config/icon-lookup"><img src="https://agentmods.dev/badge/skills/malob/nix-config/icon-lookup.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00140 | $0.00666 |
| Opus 5 | $0.00070 | $0.00333 |
| Sonnet 5 | $0.00028 | $0.00133 |
| Haiku 4.5 | $0.00014 | $0.00067 |
Grade A, and why
icon-lookup 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.
BMP PUA Unicode Workaround
Claude Code filters Unicode characters in the BMP Private Use Area (U+E000-U+F8FF), which includes most Nerd Font icons. This skill provides tools for working with these icons.
Quick Reference
| Range | Status | Examples |
|---|---|---|
| U+E000-U+F8FF (BMP PUA) | Filtered - use placeholders | Powerline, Devicons, Font Awesome, Octicons |
| U+F0000+ (Supplementary PUA-A) | Works directly | Material Design Icons (nf-md-*) |
Automatic Features
When reading files: A PostToolUse hook automatically identifies all PUA characters, showing icon names, codepoints, and whether they're filtered.
When writing files: A PostToolUse hook automatically converts placeholder syntax to actual Unicode characters.
Placeholder Syntax
When writing icons in the filtered BMP PUA range, use placeholder syntax:
- By codepoint:
{{ U+E0A0 }}(without the spaces) - By name:
{{ nf-fa-star }}(without the spaces)
Icon Lookup
Search for icons by name:
python3 ${CLAUDE_PLUGIN_ROOT}/scripts/lookup-icon.py "<search query>"
Example searches:
git branch→ finds git-related iconsfolder→ finds folder/directory iconswizard→ finds wizard icons
Character Identification
Identify a specific character:
# Direct argument (this is nf-md-battery, a Supplementary PUA icon)
python3 ${CLAUDE_PLUGIN_ROOT}/scripts/identify-icons.py -c ""
# From stdin
echo "" | python3 ${CLAUDE_PLUGIN_ROOT}/scripts/identify-icons.py -
Workflow
- Reading files - Hook automatically shows icon info; use this to understand what icons are present
- Writing icons - Search with lookup script, then use placeholder syntax for filtered icons
- Comparing icons - Use identify script to check if two characters are the same icon
- Material Design Icons (U+F0000+) can be written directly without placeholders
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.
- 10d ago First seen · 71 lines · 140 tokens per session scan A 688e0726595c
icon-lookup is a skill published in the GitHub repository malob/nix-config (462 stars, last pushed 3d ago), licensed MIT. It adds 140 tokens to every session and 666 once invoked, about $0.0007 per session on Opus 5. 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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