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Herd also provides a Slack agent for bringing these capabilities into your team’s workspace. Install the Herd Slack agent.

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Herd Agent

Herd gives agents one interface for researching EVM activity, understanding contracts, simulating transactions, and preparing onchain actions. Use Herd through its hosted MCP server or command-line interface. The available capabilities depend on your plan and the selected chain’s indexing tier.

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Connect with MCP

Add the hosted server to an MCP client:
Then open your client’s MCP settings, select Herd, and complete the browser sign-in flow. Herd uses OAuth and does not require you to paste a token into your client.
Add https://mcp.herd.eco/v1 as a remote MCP server in Settings → MCP, then authenticate.
Add https://mcp.herd.eco/v1 as an HTTP MCP server in your Codex MCP configuration, then authenticate.
Run the command above, open /mcp, select Herd, and authenticate.

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Install the CLI

herd login opens a browser for OAuth. The CLI stores its credentials in ~/.herd/credentials.json with restricted file permissions.

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What Herd can do

Research contracts

Read verified metadata, ABIs, proxy history, deployment data, and source code.

Inspect transactions

Decode real or simulated transactions, including traces, logs, transfers, and balance changes.

Analyze indexed activity

Search contract calls, event emissions, wallet activity, token transfers, and deployments.

Build and simulate actions

Compose reusable HAL adapters and actions, organize them into collections, and simulate before execution.

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Choose the right chain tier

  • All registered EVM chains support RPC-backed transaction inspection, HAL reads and simulations, and chain-aware bookmarks.
  • Fully indexed EVM chains add historical activity search and aggregate wallet data. These chains are Base, Ethereum, and Monad.
  • Some contract and wallet features have narrower capability requirements. See Supported Chains.