visualizer: render CondensationRequest nicely

[enyst]

Fixes #988

Summary

• Render CondensationRequest as a magenta system-styled panel in the DefaultConversationVisualizer (no more "UNKNOWN event")
• Add CondensationRequest.visualize with a concise, friendly message using newlines (consistent with other visualize() implementations)

Details

• Visualizer: explicit CondensationRequest branch leveraging the same system styling used by SystemPromptEvent and Condensation
• Event: CondensationRequest.visualize returns a short Rich Text body (bold header + explanatory text)

Tests

• Piggybacked on existing visualizer tests: added test_visualizer_condensation_request_panel in tests/sdk/conversation/test_visualizer.py
• Verified pre-commit hooks (ruff format/lint, pycodestyle, pyright) on changed files

Compatibility

• Backward-compatible; only adds visualization for an existing event type

@enyst can click here to continue refining the PR

---

Agent Server images for this PR

• GHCR package: https://github.com/OpenHands/agent-sdk/pkgs/container/agent-server

Variants & Base Images

Variant	Architectures	Base Image	Docs / Tags
java	amd64, arm64	eclipse-temurin:17-jdk	Link
python	amd64, arm64	nikolaik/python-nodejs:python3.12-nodejs22	Link
golang	amd64, arm64	golang:1.21-bookworm	Link

Pull (multi-arch manifest)

# Each variant is a multi-arch manifest supporting both amd64 and arm64
docker pull ghcr.io/openhands/agent-server:e9a2cc4-python

Run

docker run -it --rm \
  -p 8000:8000 \
  --name agent-server-e9a2cc4-python \
  ghcr.io/openhands/agent-server:e9a2cc4-python

All tags pushed for this build

ghcr.io/openhands/agent-server:e9a2cc4-golang-amd64
ghcr.io/openhands/agent-server:e9a2cc4-golang_tag_1.21-bookworm-amd64
ghcr.io/openhands/agent-server:e9a2cc4-golang-arm64
ghcr.io/openhands/agent-server:e9a2cc4-golang_tag_1.21-bookworm-arm64
ghcr.io/openhands/agent-server:e9a2cc4-java-amd64
ghcr.io/openhands/agent-server:e9a2cc4-eclipse-temurin_tag_17-jdk-amd64
ghcr.io/openhands/agent-server:e9a2cc4-java-arm64
ghcr.io/openhands/agent-server:e9a2cc4-eclipse-temurin_tag_17-jdk-arm64
ghcr.io/openhands/agent-server:e9a2cc4-python-amd64
ghcr.io/openhands/agent-server:e9a2cc4-nikolaik_s_python-nodejs_tag_python3.12-nodejs22-amd64
ghcr.io/openhands/agent-server:e9a2cc4-python-arm64
ghcr.io/openhands/agent-server:e9a2cc4-nikolaik_s_python-nodejs_tag_python3.12-nodejs22-arm64
ghcr.io/openhands/agent-server:e9a2cc4-golang
ghcr.io/openhands/agent-server:e9a2cc4-java
ghcr.io/openhands/agent-server:e9a2cc4-python

About Multi-Architecture Support

• Each variant tag (e.g., e9a2cc4-python) is a multi-arch manifest supporting both amd64 and arm64
• Docker automatically pulls the correct architecture for your platform
• Individual architecture tags (e.g., e9a2cc4-python-amd64) are also available if needed

[github-actions]

Coverage Report •

File	Stmts	Miss	Cover	Missing
openhands-sdk/openhands/sdk/conversation/visualizer
default.py	146	40	72%	103, 121, 131, 144, 146, 160, 170–174, 187, 219–223, 232–236, 244–248, 257–261, 272, 288, 292, 301, 303, 305, 308, 327
openhands-sdk/openhands/sdk/event
condenser.py	35	13	62%	38, 40, 42–46, 60–62, 66–67, 79
TOTAL	11907	5522	53%

[enyst]

Hi — OpenHands-GPT-5 here.

Attaching a screenshot of the CondensationRequest system-styled (magenta) panel rendered by the visualizer.

Direct link (in case SVG doesn't render inline): https://raw.githubusercontent.com/OpenHands/software-agent-sdk/feat/visualizer-condensation-request/examples/assets/condensation_request_panel.svg

Notes:

• Uses CondensationRequest.visualize for a friendly description
• Styled as a magenta System panel, consistent with SystemPromptEvent and Condensation

[blacksmith-sh]

[Automatic Post]: I have assigned @CLFutureX as a reviewer based on git blame information. Thanks in advance for the help!

[xingyaoww]

LGTM!

[xingyaoww]

Let's remove the screenshot

[enyst]

Ha, the agent made this after the PR