Borrowing it
Nothing to install: this file belongs to mantisfury/ArkhamMirror. 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/mantisfury/ArkhamMirror/main/CLAUDE.mdgit clone --depth 1 https://github.com/mantisfury/ArkhamMirrorWrote 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/mantisfury/arkhammirror/claude-md)<a href="https://agentmods.dev/instructions/mantisfury/arkhammirror/claude-md"><img src="https://agentmods.dev/badge/instructions/mantisfury/arkhammirror/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/mantisfury/arkhammirror/claude-md"><img src="https://agentmods.dev/badge/instructions/mantisfury/arkhammirror/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 | $0.02199 | $0.02199 |
| Opus 5.5 | $0.00880 | $0.00880 |
| Sonnet 5.5 | $0.00440 | $0.00440 |
| Haiku 4.5 | $0.00220 | $0.00220 |
Grade A, and why
ArkhamMirror CLAUDE.md 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 2mo 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 — 296 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SHATTERED - Project Guidelines
Project Overview
SHATTERED is a modular "distro-style" architecture where shards (feature modules) are loaded into a frame (core infrastructure). The system follows the Voltron philosophy: plug-and-play components that combine into a unified application.
Architecture
+------------------+
| ArkhamFrame | <-- THE FRAME (immutable core)
| (Core Infra) |
+--------+---------+
|
+--------+---------+
| arkham-shell | <-- THE SHELL (UI renderer)
| (React/TypeScript)|
+--------+---------+
|
+--------------------+--------------------+
| | | | |
+----v----+ +--v--+ +-----v-----+ +--v--+ +---v---+
|Dashboard| | ACH | | Search | |Parse| | Graph | <-- SHARDS
| Shard | |Shard| | Shard | |Shard| | Shard |
+---------+ +-----+ +-----------+ +-----+ +-------+
Critical Rules
The Frame (packages/arkham-frame/)
- IMMUTABLE: Shards are NOT allowed to alter the frame
- Provides core services: database, vectors, LLM, events, workers
- Defines the
ArkhamShardABC that all shards must implement - Shards depend on the frame, never the reverse
The Shell (packages/arkham-shard-shell/)
- React/TypeScript UI application
- Renders navigation from shard manifests
- Provides generic list/form components for shards
- Shards can have custom UIs or use generic rendering
Shards (packages/arkham-shard-*/)
- Self-contained feature modules
- CAN depend on the frame (
arkham-frame>=0.1.0) - CAN optionally utilize outputs of other shards (via events/shared data)
- CANNOT depend on other shards (no direct imports)
- CANNOT modify the frame
- Communicate via the EventBus for loose coupling
Shard Standards (Reference Implementation: arkham-shard-ach)
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.
- 2mo ago First seen · 296 lines · 2,199 tokens per session scan A 29b1521520bf
ArkhamMirror CLAUDE.md is an instructions file published in the GitHub repository mantisfury/ArkhamMirror (502 stars, last pushed 9mo ago), licensed MIT. It adds 2,199 tokens to every session, about $0.0088 per session on Opus 5.5. 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.
ArkhamMirror CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| ArkhamMirror CLAUDE.mdmantisfury/ArkhamMirror | Instructions file | 502 | 9mo ago | MIT | A | 2,199 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
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| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |