messaging-agents

Messaging Agents

This skill enables you to send messages to other agents on the same Letta server using the thread-safe conversations API.

When to Use This Skill

• You need to ask another agent a question
• You want to query an agent that has specialized knowledge
• You need information that another agent has in their memory
• You want to coordinate with another agent on a task

What the Target Agent Can and Cannot Do

The target agent CANNOT:

• Access your local environment (read/write files in your codebase)
• Execute shell commands on your machine
• Use your tools (Bash, Read, Write, Edit, etc.)

The target agent CAN:

• Use their own tools (whatever they have configured)
• Access their own memory blocks
• Make API calls if they have web/API tools
• Search the web if they have web search tools
• Respond with information from their knowledge/memory

Important: This skill is for communication with other agents, not delegation of local work. The target agent runs in their own environment and cannot interact with your codebase.

Need local access? If you need the target agent to access your local environment (read/write files, run commands), use the Agent tool instead to deploy them as a subagent:

Agent({
  agent_id: "agent-xxx",            // Deploy this existing agent
  subagent_type: "general-purpose", // read-write access to your local tools
  prompt: "Look at the code in src/ and tell me about the architecture"
})

This gives the agent access to your codebase while running as a subagent.

Finding an Agent to Message

If you don't have a specific agent ID, use these skills to find one:

By Name or Tags

Load the finding-agents skill to search for agents:

letta agents list --query "agent-name"
letta agents list --tags "origin:letta-code"

By Topic They Discussed

Search messages across all agents to find which agent worked on something:

letta messages search --query "topic" --all-agents

Results include agent_id for each matching message.