Borrowing it
Nothing to install: this file belongs to sd0xdev/sd0x-harness. 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/sd0xdev/sd0x-harness/main/CLAUDE.mdgit clone --depth 1 https://github.com/sd0xdev/sd0x-harnessWrote 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/sd0xdev/sd0x-harness/claude-md)<a href="https://agentmods.dev/instructions/sd0xdev/sd0x-harness/claude-md"><img src="https://agentmods.dev/badge/instructions/sd0xdev/sd0x-harness/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/sd0xdev/sd0x-harness/claude-md"><img src="https://agentmods.dev/badge/instructions/sd0xdev/sd0x-harness/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 | $0.02694 | $0.02694 |
| Opus 5.5 | $0.01078 | $0.01078 |
| Sonnet 5.5 | $0.00539 | $0.00539 |
| Haiku 4.5 | $0.00269 | $0.00269 |
Grade A, and why
sd0x-harness 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 1mo 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 — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.
sd0x-dev-flow — Harness Engineering for Claude Code
How binding is a line in this file? Three tiers: Anchor (never deviate), Default (the normal call; deviate by stating a [DEVIATION] line that cites a fact signal, then keep working), Guidance (advisory). This file's own baseline is Default and lines above that baseline are marked inline — @rules/discretion.md classifies the plugin-managed rules/*.md, not this file, but its Anchor Register is the authority everywhere: a line here that hits the Register is Anchor no matter how it is worded or where it is restated.
Judgment inside the Default range is the expected behaviour, not a tolerated exception: decide from the change in front of you and continue. Uncertainty alone is not a reason to stop and ask — the human exits are the union of the ones enumerated in @rules/auto-loop.md and, for scope, in the contract @rules/scope-discipline.md points to (skills/codex-code-review/references/scope-contract.md § Human Exits); those two enumerations are the closed list, not this sentence.
Required Checks (Stop Hook reminded)
This table constrains the end state, not your choreography. How you batch edits, how deep you review, and when you run each gate are yours to choose; what is fixed is that every gate a change class requires has passed after the last edit in that class.
| Change Type | Must Run | Can Skip |
|---|---|---|
| code files | /codex-review-fast -> /precommit |
- |
.md docs |
/codex-review-doc |
/codex-review-fast |
Comment-only edits get no free pass: comments can carry compiler/lint/build directives (scripts/lib/utils.js:142 proves it), so edits to code files are conservatively classified as code even when only comments changed. Before PR: /pr-review.
The Stop Hook is a reminder, not a gate (hook-lightweighting, 2026-08-13): it prints which gates the reminder state still shows as owed and always exits 0. What binds is the behaviour layer — the terminal completion invariant in @rules/auto-loop.md — with verdicts recorded via
node scripts/review-state.js note, digest-bound so an edit re-opens its plane. Details:docs/features/hook-lightweighting/2-tech-spec.md§3.
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.
- 1mo ago Changed · +16 lines · +382 tokens per session 27b2ed4670a5
- 1mo ago Changed · +1 lines · +90 tokens per session c59053609cfc
- 1mo ago Changed · +174 tokens per session 2e581439fc0f
- 1mo ago Changed · +48 tokens per session ed71e4d0a718
- 1mo ago First seen · 75 lines · 2,000 tokens per session scan A f464621af2ea
sd0x-harness CLAUDE.md is an instructions file published in the GitHub repository sd0xdev/sd0x-harness (194 stars, last pushed 20d ago), licensed MIT. It adds 2,694 tokens to every session, about $0.0108 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.