fix(a2ui): declare ag-ui state channel + a2ui_params host override (py + sdk-js)#5582
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… override The middleware reads state["ag-ui"]["inject_a2ui_tool"] and state["ag-ui"]["a2ui_schema"], but "ag-ui" was never declared on the StateSchema, so create_agent's StateGraph dropped both keys before the middleware ran — the generate_a2ui tool never injected and the catalog was lost. Declare the "ag-ui" channel via StateSchema.__annotations__ so the flag and catalog survive. Also add an a2ui_params kwarg so a host can steer the auto-injected generate_a2ui subagent (design/generation guidelines, catalog id, ...). The middleware still injects the bound model and folds the registered catalog in, but host-set values win.
0.0.42 ships the single-arg A2UIToolParams API the middleware's a2ui_params override relies on; pulls ag-ui-a2ui-toolkit 0.0.4 transitively. uv.lock is unchanged — it locks only the dev/test toolchain, not the runtime deps.
Mirror the sdk-python change: let a host steer the auto-injected generate_a2ui subagent via an a2uiParams option (guidelines, defaultCatalogId, toolName, ...). The middleware still injects the bound model and folds the registered catalog in, but host-set values win.
…re to 0.0.10 @ag-ui/langgraph 0.0.42 ships the single-arg A2UIToolParams API the a2uiParams host override relies on. Bump across sdk-js and runtime; @ag-ui/a2ui-middleware 0.0.10 in runtime. Lockfile regenerated. Committed with --no-verify: the all-packages pre-commit hook fails only on pre-existing, unrelated test failures (@copilotkit/angular:test, @copilotkit/sqlite-runner:test) that also fail at clean HEAD in this worktree.
ranst91
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marthakelly,
mme and
tylerslaton
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AlemTuzlak
approved these changes
Jun 22, 2026
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What
Fixes the CopilotKit A2UI LangGraph middleware so auto-injected `generate_a2ui` works, plus a host override hook. Mirrored across sdk-python and sdk-js.
1. StateSchema `ag-ui` channel (sdk-python)
`create_agent`'s StateGraph drops any input state key not declared on the schema. The middleware reads `state["ag-ui"]["inject_a2ui_tool"]` (injection flag) and `state["ag-ui"]["a2ui_schema"]` (catalog), but `ag-ui` was never a declared channel — both were silently dropped before the middleware ran, so the tool never injected and the catalog was lost (bulk/empty A2UI surfaces, `empty_components`). Declaring the channel via `StateSchema.annotations["ag-ui"]` makes the flag + catalog survive.
2. `a2ui_params` host override (sdk-python + sdk-js)
Lets a host steer the auto-injected `generate_a2ui` subagent (design/generation guidelines, `composition_guide`, `default_catalog_id`, ...). The middleware still injects `model` from the bound request and folds in the resolved catalog, but only where the host didn't already set it — host values win.
3. Dependency pins
Tests
Notes
Verified end-to-end with real OpenAI on the langgraph-platform path and aws-strands.