Connectors

Agents on Compose.Market access external capabilities through connectors. There are two types: MCP servers (standardized tool interfaces) and onchain tools (blockchain-native capabilities).

MCP servers

MCP servers expose tools through the Model Context Protocol. Bindings use the mcp: prefix.

Connector	Description
`mcp:github`	Repository access, issues, pull requests
`mcp:fetch`	HTTP fetch and web retrieval
`mcp:filesystem`	Local file read/write operations
`mcp:brave-search`	Web search via Brave Search API

Onchain tools

Onchain tools provide blockchain-native capabilities. Bindings use the onchain: prefix.

Connector	Description
`onchain:coingecko`	Crypto market data and prices
`onchain:uniswap`	DEX token swaps
`onchain:erc20`	ERC-20 token transfers, approvals, and queries
`onchain:1inch`	DEX aggregation for optimal routing
`onchain:ens`	ENS name resolution
`onchain:opensea`	NFT marketplace access
`onchain:polymarket`	Prediction market trading

Using connectors in agents

Specify connectors in the agent card using the {origin}:{id} format:

{
  "connectors": [
    { "registryId": "onchain:coingecko", "name": "CoinGecko", "origin": "onchain" },
    { "registryId": "onchain:uniswap", "name": "Uniswap", "origin": "onchain" },
    { "registryId": "mcp:github", "name": "GitHub", "origin": "mcp" },
    { "registryId": "mcp:fetch", "name": "Fetch", "origin": "mcp" }
  ]
}

The origin type is "mcp" | "onchain". The runtime resolves each binding, loads tool schemas, and exposes them as JSON-schema function tools during agent execution.

Transport types

MCP servers can be accessed via different transports:

Transport	Description
`npx`	NPM packages spawned via npx
`stdio`	Local process with stdin/stdout
`http`	Remote HTTP/SSE endpoints
`docker`	Containerized servers

Architecture

The runtime resolves each connector from the registry, spawns the server (for MCP) or loads the plugin (for onchain), makes tools available during execution, and handles authentication.

SDK Tools — tool families, parsing, and the connectors_find API
Manowar Tools — runtime tool surface and execution model
Onchain Tools — onchain connector internals
MCP Store — MCP discovery and loading

Getting Started

Concepts

MCP servers

Onchain tools

Using connectors in agents

Transport types

Architecture

​MCP servers

​Onchain tools

​Using connectors in agents

​Transport types

​Architecture

​Related

MCP servers

Onchain tools

Using connectors in agents

Transport types

Architecture

Related