Borrowing it
Nothing to install: this file belongs to haoxiang-xu/PuPu. 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/haoxiang-xu/PuPu/main/CLAUDE.mdgit clone --depth 1 https://github.com/haoxiang-xu/PuPuWrote 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/haoxiang-xu/pupu/claude-md)<a href="https://agentmods.dev/instructions/haoxiang-xu/pupu/claude-md"><img src="https://agentmods.dev/badge/instructions/haoxiang-xu/pupu/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/haoxiang-xu/pupu/claude-md"><img src="https://agentmods.dev/badge/instructions/haoxiang-xu/pupu/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 | $0.01264 | $0.01264 |
| Opus 5 | $0.00632 | $0.00632 |
| Sonnet 5 | $0.00253 | $0.00253 |
| Haiku 4.5 | $0.00126 | $0.00126 |
Grade A, and why
PuPu 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 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.
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 — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.
GitNexus — Code Intelligence
This project is indexed by GitNexus as PuPu (34975 symbols, 121363 relationships, 1146 execution flows).
Index stale? Run
node .gitnexus/run.cjs analyze --index-onlyfrom the project root — it auto-selects an available runner. No.gitnexus/run.cjsyet? Bootstrap withnpx,bunx, orpnpm dlx— e.g.bunx gitnexus@latest analyze(npm 11 npx crash; #1939).
Always Do
- MUST run impact analysis before editing. Use
impact({target: "symbolName", direction: "upstream"})(MCP) ornode .gitnexus/run.cjs impact "symbolName" --direction upstream --repo .(CLI fallback); report callers, processes, and risk. Never substitute grep for graph analysis. - MUST analyze graph changes before committing. Use
detect_changes({scope: "all"})(MCP) ornode .gitnexus/run.cjs detect-changes --scope all --repo .(CLI fallback).partial: trueortruncated: trueis not a clean check — a zero means unseen, not unaffected; re-run it. For regression review:detect_changes({scope: "compare", base_ref: "main"})ornode .gitnexus/run.cjs detect-changes --scope compare --base-ref "main" --repo .. - MUST warn the user if impact analysis returns HIGH or CRITICAL risk before proceeding with edits.
- MUST treat
risk: UNKNOWNas unresolved, not as low. An empty caller set is not evidence the symbol is unused — it can also mean the callers are not resolvable by the index (plain-object property access, dynamic dispatch, cross-language calls).impactpairsUNKNOWNwith ariskNotesaying so. Confirm with a text search before treating the symbol as safe to change or delete; do not proceed on the strength of a zero. - When exploring unfamiliar code, use
query({search_query: "concept"})to find execution flows instead of grepping. It returns process-grouped results ranked by relevance. - When you need full context on a specific symbol — callers, callees, which execution flows it participates in — use
context({name: "symbolName"}). - For security review,
explain({target: "fileOrSymbol"})lists taint findings (source→sink flows; needsanalyze --pdg).
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 · 58 lines · 1,264 tokens per session scan A 83e18908c4f1
PuPu CLAUDE.md is an instructions file published in the GitHub repository haoxiang-xu/PuPu (36 stars, last pushed today), licensed Apache-2.0. It adds 1,264 tokens to every session, about $0.0063 per session on Opus 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.
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