curupira: Instructions file for Claude Code

CLAUDE.md

curupira CLAUDE.md is an instructions file for Claude Code from drzln/curupira. It costs 2,652 tokens per session, scanned A, original, MIT.

A set of project instructions for Curupira, an MCP debugging server that connects an agent to Chrome's developer tools for debugging React applications. MCP is a protocol for connecting agents to external tools.

In plain words
What is it for?
Guide changes involving the Chrome connection, MCP handlers, server startup, dependency injection, and the project's shared TypeScript structure.
Why use it?
It gives coding work in the Curupira project consistent guidance about its architecture and implementation practices.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Claude Code.

This is drzln/curupira's own configuration. It tells Claude Code how to work on curupira 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 curupira configures โ†’

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is **Context**: Apply general [Nexus Design Principles](../../../../CLAUDE.md) and [TypeScript Standards](../../../libraries/typescript/CLAUDE.md) to Curupira's Ch.

Reuse

Borrowing it

Nothing to install: this file belongs to drzln/curupira. 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/drzln/curupira/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/drzln/curupira

Made for: Claude Code.

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Per session 2,652 This file is loaded in full into every session.
When invoked 2,652 The same file โ€” it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file โ€” 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 $0.02652 $0.02652
Opus 5.5 $0.01061 $0.01061
Sonnet 5.5 $0.00530 $0.00530
Haiku 4.5 $0.00265 $0.00265

Measured 2mo ago against content hash d6c504f333b4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

curupira CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories โ€” prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency โ€” 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.

CLAUDE.md ยท 429 lines

How it starts

The opening of the file, as written. The whole thing โ€” 429 lines โ€” stays where its author put it; the contents beside it link to each section on GitHub.

Curupira MCP Debug Server

Context: Apply general Nexus Design Principles and TypeScript Standards to Curupira's Chrome DevTools Protocol + MCP bridge architecture.

๐ŸŽฏ Curupira-Specific Implementation

Curupira is an MCP debugging server that bridges Chrome DevTools Protocol with Model Context Protocol for React application debugging.

Architecture Overview

Chrome Browser โ†” CDP WebSocket โ†” Curupira Server โ†” MCP Protocol โ†” Claude

Curupira-Specific Hierarchy (Following Nexus Standards)

Level 0: Foundation        โ†’ Branded types, interfaces, configuration, errors
Level 1: Core Services     โ†’ Chrome service, repositories, buffer services  
Level 2: API Layer         โ†’ MCP handlers, resource/tool providers, transport
Level 3: Application       โ†’ Server bootstrap, dependency injection container

๐Ÿ”ง Chrome DevTools Protocol Integration

CDP Connection Management

// Branded types are defined in shared/src/types/branded.ts
import type { SessionId } from '@curupira/shared';

// Chrome service follows dependency injection pattern
export class ChromeService extends EventEmitter implements IChromeService {
  constructor(
    private readonly config: ChromeConfig,
    private readonly logger: ILogger,
    private readonly consoleBufferService?: IConsoleBufferService,
    networkBufferService?: INetworkBufferService
  ) {
    super();
  }

  async connect(options: ConnectionOptions): Promise<IChromeClient> {
    const client = new ChromeClient(this.logger, this.browserlessDetector, options);
    await client.connect();
    this.client = client;
    
    // Emit events for dynamic tool registration
    this.emit('connected', { client, options });
    
    return client;
  }
}

React Application Detection

// React detection implemented in integrations/react/detector.ts
export class ReactDetector {
  constructor(private logger: ILogger) {}
  
  async detect(client: IChromeClient, sessionId?: string): Promise<ReactInfo | null> {
    try {
      // Simplified detection using Runtime.evaluate
      const result = await client.send('Runtime.evaluate', {
        expression: 'typeof window.__REACT_DEVTOOLS_GLOBAL_HOOK__ !== "undefined"',
        returnByValue: true
      }, sessionId);
      
      if (result.result?.value === true) {
        return this.extractReactInfo(client, sessionId);
      }
      
      return null;
    } catch (error) {
      this.logger.debug({ error }, 'React detection failed');
      return null;
    }
  }
}

Read the full file on GitHub ยท 429 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 ยท 429 lines ยท 2,652 tokens per session scan A d6c504f333b4

Subscribe to this mod's changes

curupira CLAUDE.md is an instructions file published in the GitHub repository drzln/curupira (1 stars, last pushed 29d ago), licensed MIT. It adds 2,652 tokens to every session, about $0.0106 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 2026-08-31.

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