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Chimera Scaffold

Chimera Scaffold

Local
github.com/Recon-FuzzDeveloper Tools0Updated 28w ago
Repository

About Chimera Scaffold

Chimera Scaffold is a local MCP server for Solidity developers building Chimera fuzzing suites. It generates compile-ready project files, invariant properties, and fuzzer configurations for six protocol types.

Key features

  1. 01Scaffold complete Chimera projects
  2. 02Generate invariant property skeletons
  3. 03Provide protocol-specific templates
  4. 04Explain Solidity testing patterns
  5. 05Generate fuzzer configuration files

Use cases

  1. 01Create a fuzzing suite for a Solidity contract
  2. 02Start invariant testing for a vault or lending protocol
  3. 03Review actor, ghost, or cross-contract patterns

MCP support

The MCP server exposes tools to scaffold projects, generate properties, retrieve templates, and explain patterns. It runs locally without network calls.

#solidity#fuzzing#invariant-testing#smart-contracts#security#chimera#mcp

Configuration

Local server config is the same for every client. Copy it into your client’s MCP config file.

mcp.json · Universal config
{
  "mcpServers": {
    "recon-mcp-chimera": {
      "command": "npx",
      "args": [
        "-y",
        "@recon-fuzz-mcp/chimera"
      ]
    }
  }
}
Run commandnpx -y @recon-fuzz-mcp/chimera

Local servers need a runtime on your machine (e.g. Node.js 18+). Config file locations differ by client; see your client’s docs.

Packages
npm@recon-fuzz-mcp/chimera

Tools

4

Saved tool list · updated 2w ago

ParameterTypeRequiredDescription
functionsarrayYesArray of function signatures, e.g. ["deposit(uint256)", "withdraw(uint256)"]
contract_namestringYesName of the contract to scaffold tests for

Details

From the project README

@recon-fuzz-mcp/chimera

npm License: MIT Node 18+

MCP server that scaffolds Chimera fuzzing test suites for Solidity smart contracts. Generates ready-to-compile projects with properties, handlers, and fuzzer configs.

Tools

ToolInputReturns
scaffold_projectcontract_name, functions[]Full Chimera project (Setup, Properties, TargetFunctions, BeforeAfter, CryticTester + configs)
generate_propertiescontract_source, protocol_type8-15 curated invariant properties with Solidity skeletons
get_templatetemplate_nameComplete ready-to-compile Chimera project for a standard protocol type
explain_patternpattern_nameDetailed explanation with code examples
Protocol types

erc20, vault, lending, amm, governance, staking

Patterns

actors, ghosts, cross-contract, setup-layering

Installation

Claude Code
claude mcp add chimera-scaffold -- npx @recon-fuzz-mcp/chimera
Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "chimera-scaffold": {
      "command": "npx",
      "args": ["@recon-fuzz-mcp/chimera"]
    }
  }
}
Cursor

Add to .cursor/mcp.json in your project:

{
  "mcpServers": {
    "chimera-scaffold": {
      "command": "npx",
      "args": ["@recon-fuzz-mcp/chimera"]
    }
  }
}

No API key needed. The server runs entirely locally with no network calls.

Local development

git clone https://github.com/Recon-Fuzz/recon-mcp-chimera.git
cd recon-mcp-chimera
npm install
npm run build
Test it works
# List tools
echo '{"jsonrpc":"2.0","method":"tools/list","id":1}' | node dist/index.js

# Scaffold a vault project
echo '{"jsonrpc":"2.0","method":"tools/call","params":{"name":"scaffold_project","arguments":{"contract_name":"SimpleVault","functions":["deposit(uint256)","withdraw(uint256)"]}},"id":2}' | node dist/index.js

# Get a lending template
echo '{"jsonrpc":"2.0","method":"tools/call","params":{"name":"get_template","arguments":{"template_name":"lending"}},"id":3}' | node dist/index.js

Architecture

  • No network calls — everything is in-memory templates and string generation
  • src/templates/base.ts — Solidity file generators (Setup, BeforeAfter, Properties, TargetFunctions, CryticTester)
  • src/templates/configs.ts — Fuzzer config generators (foundry.toml, echidna.yaml, medusa.json)
  • src/properties/ — Curated property catalogs per protocol type (8-15 properties each)
  • src/patterns/ — Pattern explanations with full Solidity code examples
  • src/tools/ — MCP tool implementations

Privacy

This server runs entirely offline. No network calls, no environment variables read, no data written to disk, no telemetry. All template generation happens in-process.

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