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bloodhound: Instructions file for Claude Code

CLAUDE.md

bloodhound CLAUDE.md is an instructions file for Claude Code from nerdsane/bloodhound. It costs 7,861 tokens per session, scanned B, original, MIT.

Development guidance for Bloodhound, a tool that repeatedly simulates distributed systems to find bugs under controlled failures. It covers coding rules, formal specifications and reproducible testing.

In plain words
What is it for?
Use it when changing Bloodhound code, writing or checking TLA+ specifications, adding deterministic fault tests, or debugging behavior that must replay exactly.
Why use it?
It gives contributors a shared definition of correct behavior for a system where timing and failures can be difficult to reproduce. It also sets priorities such as safety before performance.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is nerdsane/bloodhound's own configuration. It tells Claude Code how to work on bloodhound itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything bloodhound configures →

Not installable: its command points at a path on the author’s own machine, so it runs nowhere else. The line is /home/sesh/Development/.

not rated 25repo 9mo ago B scan 7,861 tokens original MIT
View source ↗ nerdsane/bloodhound
Reuse

Borrowing it

Nothing to install: this file belongs to nerdsane/bloodhound. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/nerdsane/bloodhound/master/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/nerdsane/bloodhound

Made for: Claude Code.

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README.md
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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.

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Per session 7,861 This file is loaded in full into every session.
When invoked 7,861 The same file — it is already loaded in full.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.07861 $0.07861
Opus 5.5 $0.03144 $0.03144
Sonnet 5.5 $0.01572 $0.01572
Haiku 4.5 $0.00786 $0.00786

Measured 2mo ago against content hash 94bc6b4d9143, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

bloodhound CLAUDE.md 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 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

sudo cp /home/sesh/Development/gvisor/bazel-bin/runsc/runsc_/runsc /usr/local/bin/runsc-dst
CLAUDE.md · 891 lines

How it starts

The opening of the file, as written. The whole thing — 891 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Bloodhound Development Guide

Instructions for AI agents and human developers working on Bloodhound.

Project Overview

Bloodhound is a deterministic simulation testing platform for hunting bugs in distributed systems using a modified QEMU hypervisor.

Key Goals:

  • Perfect reproducibility: Same seed = identical execution, always
  • Language agnostic: Test any containerized application without modification
  • Systematic fault injection: BUGGIFY-style deterministic faults
  • Time-travel debugging: Full replay capability with GDB integration

Engineering Philosophy

Three pillars ground all code in Bloodhound:

  1. TigerStyle - Coding standards (assertions, explicit limits, naming)
  2. Formal Specifications (specs/tla/, src/stateright/) - Protocol correctness
  3. Deterministic Simulation Testing - Fault tolerance verification

Before writing code, consult all three. They define what "correct" means.

Priority order: Safety > Performance > Developer Experience

The Verification Pyramid

All three pillars are connected through shared invariants (src/invariants/):

         TLA+ Specs (specs/tla/*.tla)
                    │ mirrors
         Shared Invariants (src/invariants/*.rs)  ← SINGLE SOURCE OF TRUTH
                    │ used by
    ┌───────────────┼───────────────┐
    ▼               ▼               ▼
Stateright      DST Tests      Production Code
(exhaustive)    (simulation)   (TigerStyle)

Each invariant has:

  • name - matches TLA+ property name
  • tla_spec - source spec file reference
  • tla_line - line number in spec
  • holds / violation - result with context

Example: When implementing snapshot tree operations:

  1. Read specs/tla/SnapshotTree.tla for the protocol
  2. Use SnapshotPropertyChecker from invariants/snapshot.rs in your tests
  3. Properties like no_orphan_snapshots are verified identically across all layers

Read the full file on GitHub · 891 lines

Changes

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.

  1. 2mo ago First seen · 891 lines · 7,861 tokens per session scan B 94bc6b4d9143

Subscribe to this mod's changes

bloodhound CLAUDE.md is an instructions file published in the GitHub repository nerdsane/bloodhound (25 stars, last pushed 9mo ago), licensed MIT. It adds 7,861 tokens to every session, about $0.0314 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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