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 haabe/mycelium/plugin install myceliumWrote 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/haabe/mycelium/service-check)<a href="https://agentmods.dev/skills/haabe/mycelium/service-check"><img src="https://agentmods.dev/badge/skills/haabe/mycelium/service-check.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 5.1 | $0.00021 | $0.01657 |
| Opus 5 | $0.00010 | $0.00829 |
| Sonnet 5 | $0.00004 | $0.00331 |
| Haiku 4.5 | $0.00002 | $0.00166 |
Grade A, and why
service-check 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 4d 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 — 148 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Service Check Skill
Evaluate against Lou Downe's 15 principles.
Checklist
For each principle, assess: Pass / Partial / Fail / N/A
-
Easy to find: Can users find this service without knowing its name?
- Discoverable through natural search terms
- Linked from logical starting points
-
Clearly explains its purpose: Is it immediately clear what this does?
- Purpose statement visible without scrolling
- Target audience identifiable
-
Sets expectations: Do users know what will happen?
- Timeline/process visible upfront
- Requirements stated before starting
-
Enables completion: Can users finish what they came to do?
- End-to-end journey works
- No organizational barriers blocking completion
-
Familiar: Does it work the way users expect?
- Uses conventions users know
- No surprising behavior
-
No prior knowledge needed: Can a new user succeed?
- No jargon or acronyms without explanation
- No assumed context
-
Agnostic of org structures: Are internal boundaries invisible?
- Users don't need to know which department handles what
- No internal handoffs visible to users
-
Minimum steps: Is every step necessary?
- No redundant data entry
- No unnecessary confirmation steps
-
Consistent: Is language/design uniform throughout?
- Same terms used for same concepts
- Visual patterns consistent
-
No dead ends: Is there always a next step?
- Error states have recovery paths
- Edge cases have guidance
-
Usable by everyone: Is it accessible and inclusive?
- WCAG 2.1 AA compliant
- Works across devices and assistive technologies
-
Encourages right behaviors: Does design nudge good outcomes?
- No dark patterns (confirmshaming, hidden costs, forced continuity, misdirection, roach motel, trick questions, bait-and-switch)
- Default options are the safe/good ones
- Behavioral science used to HELP users, not exploit them (Shotton: ethical application)
- If dark patterns detected: flag "Dark Pattern Marketing" anti-pattern (see ${CLAUDE_PLUGIN_ROOT}/harness/anti-patterns.md)
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.
- 4d ago Changed · +41 lines df3e0e450569
- 8d ago First seen · 107 lines · 21 tokens per session scan A 666045f6d4fe
service-check is a skill published in the GitHub repository haabe/mycelium (45 stars, last pushed yesterday), licensed MIT. It adds 21 tokens to every session and 1,657 once invoked, about $0.0001 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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