Borrowing it
Nothing to install: this file belongs to mycelium-io/mycelium. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/mycelium-io/mycelium/main/CLAUDE.mdgit clone --depth 1 https://github.com/mycelium-io/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/instructions/mycelium-io/mycelium/claude-md)<a href="https://agentmods.dev/instructions/mycelium-io/mycelium/claude-md"><img src="https://agentmods.dev/badge/instructions/mycelium-io/mycelium/claude-md/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/instructions/mycelium-io/mycelium/claude-md"><img src="https://agentmods.dev/badge/instructions/mycelium-io/mycelium/claude-md.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 | $0.05454 | $0.05454 |
| Opus 5.5 | $0.02182 | $0.02182 |
| Sonnet 5.5 | $0.01091 | $0.01091 |
| Haiku 4.5 | $0.00545 | $0.00545 |
Grade C, and why
mycelium CLAUDE.md scanned grade C with 2 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 3d 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.
Downloads and executes remote codehighSupply chain
curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.
`curl -fsSL https://mycelium-io.github.io/mycelium/install.sh | bash` (the Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
`curl -fsSL https://mycelium-io.github.io/mycelium/install.sh | bash` (the The source is not reproduced here
A licence we could not identify
The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.
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.
- 3d ago Changed · +10 lines · +147 tokens per session ec66c5c4a39f
- 4d ago Changed · +18 lines · +333 tokens per session b62b388356ae
- 6d ago Changed · +7 lines · +144 tokens per session 55293238d942
- 7d ago Changed · +2 lines · +15 tokens per session fc7617247f63
- 10d ago Changed · -982 lines · -18,895 tokens per session ac10515a3f1d
- 11d ago Changed · +109 lines · +2,027 tokens per session e33d19a51f5a
- 12d ago Changed · +18 lines · +387 tokens per session 3309ec085035
- 13d ago Changed · +38 lines · +640 tokens per session ffa3f6bcb6be
- 14d ago Changed · +57 lines · +1,128 tokens per session fb1101b3d053
- 15d ago First seen · 1,103 lines · 19,528 tokens per session scan C ead903f41cf6
mycelium CLAUDE.md is an instructions file published in the GitHub repository mycelium-io/mycelium (125 stars, last pushed yesterday), with no licence file. It adds 5,454 tokens to every session, about $0.0218 per session on Opus 5.5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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