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fix(core): remove send_message tool requirement from A2A messages (#9383)

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The A2A messaging tools were instructing receiving agents to use the
send_message tool to reply, but that tool is often not attached to
agents anymore. This caused agents confusion when they couldn't find
the required tool.

For synchronous functions (send_message_to_agent_and_wait_for_reply,
send_message_to_agents_matching_tags, send_message_to_all_agents_in_group),
the system already captures AssistantMessage automatically, so agents
just need to respond normally.

For the async/fire-and-forget function (send_message_to_agent_async),
updated to indicate it's a one-way notification and hint that messaging
tools exist without requiring a specific one.

🤖 Generated with [Letta Code](https://letta.com)

Co-authored-by: Letta <noreply@letta.com>
This commit is contained in:
Cameron
2026-02-09 10:28:00 -08:00
committed by Caren Thomas
parent 6e0e1cc312
commit 89a7a12b38
2 changed files with 5 additions and 13 deletions
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14
letta/functions/function_sets/multi_agent.py
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@@ -24,9 +24,7 @@ def send_message_to_agent_and_wait_for_reply(self: "Agent", message: str, other_
str: The response from the target agent.
"""
augmented_message = (
f"[Incoming message from agent with ID '{self.agent_state.id}' - to reply to this message, "
f"make sure to use the 'send_message' at the end, and the system will notify the sender of your response] "
f"{message}"
f"[Incoming message from agent with ID '{self.agent_state.id}' - your response will be delivered to the sender] {message}"
)
messages = [MessageCreate(role=MessageRole.system, content=augmented_message, name=self.agent_state.name)]
@@ -53,11 +51,7 @@ def send_message_to_agents_matching_tags(self: "Agent", message: str, match_all:
in the returned list.
"""
server = get_letta_server()
augmented_message = (
f"[Incoming message from external Letta agent - to reply to this message, "
f"make sure to use the 'send_message' at the end, and the system will notify the sender of your response] "
f"{message}"
)
augmented_message = f"[Incoming message from external Letta agent - your response will be delivered to the sender] {message}"
# Find matching agents
matching_agents = server.agent_manager.list_agents_matching_tags(actor=self.user, match_all=match_all, match_some=match_some)
@@ -100,8 +94,8 @@ def send_message_to_agent_async(self: "Agent", message: str, other_agent_id: str
raise RuntimeError("This tool is not allowed to be run on Letta Cloud.")
message = (
f"[Incoming message from agent with ID '{self.agent_state.id}' - to reply to this message, "
f"make sure to use the 'send_message_to_agent_async' tool, or the agent will not receive your message] "
f"[Incoming message from agent with ID '{self.agent_state.id}' - "
f"this is a one-way notification; if you need to respond, use an agent-to-agent messaging tool if available] "
f"{message}"
)
messages = [MessageCreate(role=MessageRole.system, content=message, name=self.agent_state.name)]