Borrowing it
Nothing to install: this file belongs to castorini/castorini-skills. 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/castorini/castorini-skills/main/CLAUDE.mdgit clone --depth 1 https://github.com/castorini/castorini-skillsWrote 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/castorini/castorini-skills/claude-md)<a href="https://agentmods.dev/instructions/castorini/castorini-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/castorini/castorini-skills/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/castorini/castorini-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/castorini/castorini-skills/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 | $0.00393 | $0.00393 |
| Opus 5 | $0.00197 | $0.00197 |
| Sonnet 5 | $0.00079 | $0.00079 |
| Haiku 4.5 | $0.00039 | $0.00039 |
Grade A, and why
castorini-skills CLAUDE.md scanned grade A 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 10d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
castorini-serve/ # local HTTP serving and curl pipeline orchestration What it actually says
castorini-skills
This repo contains shared agent skills for cross-repo workflows in the Castorini research group.
Structure
skills/
anserini-fatjar/ # download and run the latest Anserini fatjar quickly
castorini-cli-reference/ # shared CLI contract docs
castorini-onboard/ # single-repo or multi-repo clone/bootstrap and environment setup
castorini-pipeline/ # cross-repo pipeline orchestration
castorini-release/ # PyPI/TestPyPI publish workflow
castorini-serve/ # local HTTP serving and curl pipeline orchestration
Conventions
- Each skill has a
SKILL.mdwith YAML frontmatter (name,description). - The
descriptionfield is a trigger: write "Use when..." not "This skill does...". - Reference material goes in
references/so agents can load it on demand instead of inlining everything intoSKILL.md. - Runnable helpers go in
scripts/. - Skills describe what to check and what flags exist. They do not railroad agents into rigid step-by-step flows.
- Skills reference per-repo instruction files such as
CLAUDE.mdorAGENTS.mdfor build, test, and lint instructions. They do not duplicate them.
Target repos
- nuggetizer — nugget creation, assignment, and evaluation
- ragnarok — RAG answer generation and TREC evaluation
- rank_llm — retrieval and LLM reranking workflows
- umbrela — LLM-based relevance assessment (0–3 labels)
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.
- 10d ago First seen · 32 lines · 393 tokens per session scan A 6ba32edefd22
castorini-skills CLAUDE.md is an instructions file published in the GitHub repository castorini/castorini-skills (2 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 393 tokens to every session, about $0.0020 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other instructions, from other repositories
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.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
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).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
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.