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Documentation Index

Fetch the complete documentation index at: https://agentclientprotocol.com/llms.txt Use this file to discover all available pages before exploring further.

Slash Commands

Advertise available slash commands to clients

Agents can advertise a set of slash commands that users can invoke. These commands provide quick access to specific agent capabilities and workflows. Commands are run as part of regular prompt requests where the Client includes the command text in the prompt.

Advertising commands

After creating a session, the Agent MAY send a list of available commands via the available_commands_update session notification:

{
  "jsonrpc": "2.0",
  "method": "session/update",
  "params": {
    "sessionId": "sess_abc123def456",
    "update": {
      "sessionUpdate": "available_commands_update",
      "availableCommands": [
        {
          "name": "web",
          "description": "Search the web for information",
          "input": {
            "hint": "query to search for"
          }
        },
        {
          "name": "test",
          "description": "Run tests for the current project"
        },
        {
          "name": "plan",
          "description": "Create a detailed implementation plan",
          "input": {
            "hint": "description of what to plan"
          }
        }
      ]
    }
  }
}

The list of commands available in this session

AvailableCommand

The command name (e.g., "web", "test", "plan") Human-readable description of what the command does Optional input specification for the command

AvailableCommandInput

Currently supports unstructured text input:

A hint to display when the input hasn't been provided yet

Dynamic updates

The Agent can update the list of available commands at any time during a session by sending another available_commands_update notification. This allows commands to be added based on context, removed when no longer relevant, or modified with updated descriptions.

Running commands

Commands are included as regular user messages in prompt requests:

{
  "jsonrpc": "2.0",
  "id": 3,
  "method": "session/prompt",
  "params": {
    "sessionId": "sess_abc123def456",
    "prompt": [
      {
        "type": "text",
        "text": "/web agent client protocol"
      }
    ]
  }
}

The Agent recognizes the command prefix and processes it accordingly. Commands may be accompanied by any other user message content types (images, audio, etc.) in the same prompt array.

Last updated Oct 08, 2026