feat: subagent support (protocol + LangGraph + demo)#2137

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Commits on Jul 7, 2026

docs: subagent support design spec

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docs: subagent support implementation plan

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feat(python): add optional subagent_id to message types

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feat(core): add optional subagentId to message schemas

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feat(core): add optional subagentId to creation/standalone events

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feat(core): add SUBAGENT_STARTED/FINISHED/ERROR lifecycle events

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feat(python): add subagent_id to events and SUBAGENT_* lifecycle events

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feat(client): add subagent lifecycle subscriber hooks

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feat(client): propagate subagentId through chunk transform

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feat(client): enforce subagent lifecycle consistency in verifier

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feat(client): dispatch subagent lifecycle subscriber hooks

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test(client): strengthen subagent tests + drop dead field (CR round 1)

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chore: format and lint fixes for subagent support

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feat: add optional subagentId to REASONING_MESSAGE_CHUNK

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test: make subagent attribution assertions non-vacuous

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test(python): guard remaining subagent_id event assertions via by-alias dump

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docs: plan for subagent backward-compatibility shim

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feat(client): add version-gated subagent backward-compat shim (0.0.57)

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test(client): e2e verify 0.0.57 shim strips subagents through run pipeline

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docs: correct subagent Phase 2 backward-compat rationale

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fix(client): strip subagentId from RUN_STARTED.input echo + harden 0.0.57 shim

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fix(client): make 0.0.57 shim warn-test env-independent + correct docs

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docs: deepagents subagent attribution demo (step 1) design

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docs: deepagents subagent demo implementation plan

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docs: fold spike findings into deepagents demo plan (detection signals + dep-bump gate)

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chore(langgraph): bump langchain/langgraph to deepagents-compatible versions

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spike(langgraph): document deepagents subagent event surfacing

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feat(langgraph): derive deepagents subagent context from nested checkpoint_ns

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feat(langgraph): emit SUBAGENT_STARTED/FINISHED/ERROR at subagent boundaries

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fix(python-sdk): export SUBAGENT_STARTED/FINISHED/ERROR events from ag_ui.core

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feat(langgraph): stamp subagentId on creation events while in a subagent

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feat(langgraph-examples): add deepagents 3-subagent attribution demo agent

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fix(langgraph): emit one SUBAGENT_STARTED/FINISHED per subagent under concurrency

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feat(dojo): add deepagents subagent-attribution demo page + wiring

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fix(dojo): scope deepagents_subagents demo to the python-backed integrations

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chore: override CopilotKit's @ag-ui deps to workspace so subagentId reaches the dojo

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chore(langgraph-examples): temporarily reduce deepagents demo to one subagent for snapshot iteration

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fix(langgraph): include subagent messages (with subagentId) in MESSAGES_SNAPSHOT

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Commits on Jul 8, 2026

Commits on Jul 9, 2026

Commits on Jul 14, 2026