Add OpenHands to compatible clients

[VascoSch92]

OpenHands is an open-source platform for AI software development agents that
write code, run commands, and use tools in a sandboxed workspace.

• Homepage: https://openhands.dev/
• Source: https://github.com/OpenHands/software-agent-sdk (the Agent Plugins loader); product: https://github.com/OpenHands/OpenHands
• Setup documentation: Agent Plugins Packages, and installing plugins in Agent Canvas

Note

Draft until the OpenHands app release that carries this support is out. The
loader ships in openhands-sdk / openhands-agent-server 1.49.2 (released
2026-09-17); the OpenHands app's main already pins agent-server 1.49.2, but
its latest release (v1.20.0) still pins 1.49.1. I'll mark this ready and add
the app version once that release is published.

Surface

One listing for the OpenHands product family. Agent Plugins packages load
through the same plugin path OpenHands uses everywhere: a directory with a root
plugin.json is detected as an Agent Plugins package ahead of the legacy
layout, and is installed and attached like any other plugin (Agent Canvas UI,
or Conversation(plugins=[...]) programmatically). OpenHands implements
version 1.0.0 of the specification and uses the dev.openhands extension
namespace for its client-specific components.

• openhands-sdk / openhands-agent-server >= 1.49.2
  (release,
  format registered in feat(plugin): add the Agent Plugins mcp.json loader OpenHands/software-agent-sdk#5093)
• OpenHands app: next release after v1.20.0 (pending)

Evidence

Every item on the client conformance checklist
is mapped to a named test in
this table;
all 228 Agent Plugins tests pass at the v1.49.2 tag. The suite loads a vendored
copy of agent-plugins-example
(5f3f508) and purpose-built packages through the public Plugin.load() path
(OpenHands/software-agent-sdk#5160).

• Skills — discovered from skills/ only, each skill isolated at its own
  failure boundary; skill resources travel with the skill. Covered by
  TestVendoredExample, TestFixedLocations, TestFailureBoundaries, plus an
  end-to-end test that runs a conversation and asserts the skills reach the
  agent (tests/sdk/conversation/test_local_conversation_agent_plugins.py).
• MCP stdio — mcp.json (no leading dot) with closed-document and
  per-entry validation; commands resolved as single tokens; PLUGIN_ROOT and a
  dedicated persistent PLUGIN_DATA provided, with ${PLUGIN_ROOT} /
  ${PLUGIN_DATA} expanded only in args, env values and cwd; working
  directory contained in the plugin root. Covered by TestStdioDefaults,
  TestPlaceholderExpansion, TestFailureBoundaries, and the end-to-end test
  asserting the constructed server.
• MCP streamable-http — declared transport carried to the connection;
  URL and header requirements enforced (plain http only for loopback,
  client-generated headers dropped, headers never expanded). Covered by
  TestFixedLocations::test_the_declared_transport_is_the_one_carried and
  TestRemote in tests/sdk/plugin/test_agent_plugins_mcp.py.

sse is not claimed: entries declaring it are reported and skipped, as §7.2.2
rule 4 allows.

Logos

Official OpenHands logotype (mark + wordmark), light and dark SVG variants,
byte-identical to the brand assets published on openhands.dev:

• light: https://www.openhands.dev/assets/webflow/brand/openhands-logo-full.svg
• dark: https://www.openhands.dev/assets/webflow/brand/openhands-logo-full-on-dark.svg

pnpm build passes.

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