Agent Teams `SendMessage` / `teammate-message` notifications are rendering full teammate message bodies in the main conversation UI instead of staying compact around the `summary` field. ### Environment Observed in both: - Ubuntu 24.04 on WSL2, Claude Code `2.1.156` - Native Windows, Claude Code `2.1.158` Agent Teams is enabled in both environments. ### Expected Behavior A `SendMessage` with both `summary` and message body should render compactly by default, showing the `summary` preview.

[BUG] Agent Teams SendMessage renders teammate message bodies instead of compact summaries

Resolved 💬 2 comments Opened May 30, 2026 by ianlamfar Closed Jun 27, 2026

Agent Teams SendMessage / teammate-message notifications are rendering full teammate message bodies in the main conversation UI instead of staying compact around the summary field.

Environment

Observed in both:

Ubuntu 24.04 on WSL2, Claude Code 2.1.156
Native Windows, Claude Code 2.1.158

Agent Teams is enabled in both environments.

Expected Behavior

A SendMessage with both summary and message body should render compactly by default, showing the summary preview. The full body should remain hidden unless explicitly expanded/opened.

Actual Behavior

The UI renders both the summary-style header and the full message body directly in the transcript.

Example received message:

@haiku-tester❯ Received test message, echoing PING-7F3A-OK token
  Confirmed receipt of test message. Echo token: PING-7F3A-OK. Running on Haiku model.

Example sent message:

@team-lead❯ SendMessage round-trip test, please echo token
  This is a SendMessage round-trip test. Please reply to team-lead now via SendMessage.

  Your reply MUST include both:
  1. summary field — a 5-10 word preview, and
  2. message body — confirming receipt, echoing the token below, and stating your model.

  ECHO TOKEN: PING-7F3A-OK

  Reply via SendMessage to team-lead. Do not write local text output.
PreToolUse:SendMessage says: [2026-05-30T11:30:20Z] PreToolUse: SendMessage
PostToolUse:SendMessage says: [2026-05-30T11:30:20Z] PostToolUse: SendMessage

Notes

The message data has separate summary and body fields, so this appears to be a rendering/collapsing issue rather than missing source data.

Local config and inbox JSON are not attached here to avoid exposing private settings, but the relevant high-level setup is: Agent Teams enabled, WSL uses tmux teammate mode, and native Windows uses auto teammate mode.

Related Issues

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