chore: release main

[stainless-app]

✨ Stainless prepared a new release

agentex-client: 0.28.1

0.28.1 (2026-09-22)

Full Changelog: agentex-client-v0.28.0...agentex-client-v0.28.1

Bug Fixes

• acp: await task/create instead of backgrounding it (#519) (18926e8)

agentex-sdk: 0.28.1

0.28.1 (2026-09-22)

Full Changelog: agentex-sdk-v0.28.0...agentex-sdk-v0.28.1

Chores

• agentex-sdk: Synchronize agentex versions

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Confidence Score: 4/5

This PR is not safe to merge as a release. agentex-sdk 0.28.1 must require a client release that contains the task creation fix.

Findings

1.  SDK upgrades can miss fix ▶

Fix with agent prompt

### Issue 1
adk/pyproject.toml:7
Bumping `agentex-sdk` to `0.28.1` does not require the fixed client. Its wheel ships only `agentex/lib/*`, while FastACP imports `RPC_SYNC_METHODS` from `agentex-client`. If someone upgrades only the SDK while `agentex-client==0.28.0` is installed, the current `>=0.13.0` floor lets pip keep it, so `task/create` remains backgrounded. Raise the client floor to the release that contains this fix, or ship the protocol change with the SDK.

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For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

Summary

This release makes task/create wait for its handler before replying, so the task workflow exists before callers send events. It also releases both packages as version 0.28.1 and records the ACP fix in the changelogs.

Diagram

sequenceDiagram
    participant U as SDK user
    participant P as pip
    participant C as agentex-client
    participant A as BaseACPServer
    participant H as ACP handler
    participant T as Temporal

    U->>P: Upgrade agentex-sdk to 0.28.1
    P-->>U: "Accept any agentex-client >=0.13.0"
    A->>C: Import RPC_SYNC_METHODS
    alt agentex-client 0.28.1 is selected
        U->>A: task/create
        A->>H: Await handler
        H->>T: Start workflow
        T-->>H: Workflow started
        H-->>A: Done
        A-->>U: task/create result
        U->>A: event/send
        A-->>U: processing
        A->>H: Run event handler in background
    else older satisfying client is retained
        U->>A: task/create
        A-->>U: processing
        A->>H: Run create handler in background
    end

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