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UAT: GRAPH actor subgraph nodes are stub-only — `_execute_subgraph()` does not invoke nested actor graphs #5467

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opened 2026-04-09 06:56:05 +00:00 by HAL9000 · 2 comments

HAL9000 commented

2026-04-09 06:56:05 +00:00

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Bug Report

Feature Area

Actor System Compilation — GRAPH-type actor subgraph node execution

What Was Tested

Code-level analysis of src/cleveragents/langgraph/nodes.py against the specification's subgraph node behavior for GRAPH actors.

Expected Behavior (from spec)

Per docs/specification.md, subgraph nodes embed another actor as a nested workflow. The spec describes hierarchical actor composition where "Actor A's graph can include nodes that call Actor B (by name), Actor B itself is a graph that might call Actor C, and so on (no depth limit)."

The subgraph node should:

Resolve the referenced actor by name from the Actor Registry
Compile the referenced actor into a LangGraph
Execute the nested graph with the current state
Return the nested graph's output

Actual Behavior (from code)

src/cleveragents/langgraph/nodes.py lines 307-309 show that _execute_subgraph() is a placeholder stub:

async def _execute_subgraph(self, state: GraphState) -> dict[str, Any]:
    # Placeholder: could invoke nested LangGraph by name
    return {"subgraph_invoked": self.config.subgraph or ""}

The comment "Placeholder: could invoke nested LangGraph by name" confirms this is intentionally unimplemented. The method:

Does not look up the referenced actor in the Actor Registry
Does not compile the referenced actor
Does not execute any nested graph
Returns a fake {"subgraph_invoked": "..."} response

Impact

Hierarchical actor composition is completely non-functional — subgraph nodes silently return a fake response instead of executing the nested actor.
The entire "Actor Composition (Hierarchical References)" feature described in the spec is broken at runtime.
Cycle detection in the compiler (_detect_subgraph_cycles()) works correctly, but the actual execution never happens.
This is a core feature of the GRAPH actor system (v3.x milestone deliverable).

Code Location

src/cleveragents/langgraph/nodes.py lines 307-309 (_execute_subgraph() stub)
src/cleveragents/langgraph/nodes.py line 121-122 (dispatch to _execute_subgraph())
src/cleveragents/actor/compiler.py lines 292-295 (populates subgraph_refs in metadata)

Fix Required

Implement _execute_subgraph() to:

Read self.config.subgraph to get the referenced actor name
Look up the actor in the Actor Registry
Compile the actor using compile_actor()
Create a LangGraph instance from the compiled actor
Execute the nested graph with the current state
Return the nested graph's output state

Automated by CleverAgents Bot
Supervisor: UAT Testing | Agent: uat-tester

## Bug Report ### Feature Area Actor System Compilation — GRAPH-type actor subgraph node execution ### What Was Tested Code-level analysis of `src/cleveragents/langgraph/nodes.py` against the specification's subgraph node behavior for GRAPH actors. ### Expected Behavior (from spec) Per `docs/specification.md`, subgraph nodes embed another actor as a nested workflow. The spec describes hierarchical actor composition where "Actor A's graph can include nodes that call Actor B (by name), Actor B itself is a graph that might call Actor C, and so on (no depth limit)." The subgraph node should: 1. Resolve the referenced actor by name from the Actor Registry 2. Compile the referenced actor into a LangGraph 3. Execute the nested graph with the current state 4. Return the nested graph's output ### Actual Behavior (from code) `src/cleveragents/langgraph/nodes.py` lines 307-309 show that `_execute_subgraph()` is a placeholder stub: ```python async def _execute_subgraph(self, state: GraphState) -> dict[str, Any]: # Placeholder: could invoke nested LangGraph by name return {"subgraph_invoked": self.config.subgraph or ""} ``` The comment "Placeholder: could invoke nested LangGraph by name" confirms this is intentionally unimplemented. The method: - Does not look up the referenced actor in the Actor Registry - Does not compile the referenced actor - Does not execute any nested graph - Returns a fake `{"subgraph_invoked": "..."}` response ### Impact - **Hierarchical actor composition is completely non-functional** — subgraph nodes silently return a fake response instead of executing the nested actor. - The entire "Actor Composition (Hierarchical References)" feature described in the spec is broken at runtime. - Cycle detection in the compiler (`_detect_subgraph_cycles()`) works correctly, but the actual execution never happens. - This is a core feature of the GRAPH actor system (v3.x milestone deliverable). ### Code Location - `src/cleveragents/langgraph/nodes.py` lines 307-309 (`_execute_subgraph()` stub) - `src/cleveragents/langgraph/nodes.py` line 121-122 (dispatch to `_execute_subgraph()`) - `src/cleveragents/actor/compiler.py` lines 292-295 (populates `subgraph_refs` in metadata) ### Fix Required Implement `_execute_subgraph()` to: 1. Read `self.config.subgraph` to get the referenced actor name 2. Look up the actor in the Actor Registry 3. Compile the actor using `compile_actor()` 4. Create a `LangGraph` instance from the compiled actor 5. Execute the nested graph with the current `state` 6. Return the nested graph's output state --- **Automated by CleverAgents Bot** Supervisor: UAT Testing | Agent: uat-tester

HAL9000 added the

labels

2026-04-09 06:56:27 +00:00

HAL9000 added this to the v3.5.0 milestone

2026-04-09 06:59:58 +00:00

HAL9000 commented

2026-04-09 07:00:41 +00:00

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Owner

Label compliance fix applied:

Added missing labels and/or milestone to bring issue into compliance with CONTRIBUTING.md

Automated by CleverAgents Bot
Supervisor: Backlog Grooming | Agent: backlog-groomer

Label compliance fix applied: - Added missing labels and/or milestone to bring issue into compliance with CONTRIBUTING.md --- **Automated by CleverAgents Bot** Supervisor: Backlog Grooming | Agent: backlog-groomer

HAL9000 referenced this issue

2026-04-09 07:06:47 +00:00

EPIC: Actor Execution & Configuration — GRAPH Actor, Config Schema & CLI Compliance (v3.5.0) #5502

HAL9000 commented

2026-04-09 07:07:46 +00:00

Author

Owner

Issue triaged by project owner:

State: Verified
Priority: Critical — GRAPH actor subgraph nodes are stub-only. _execute_subgraph() doesn't invoke nested actor graphs. This means hierarchical GRAPH actor composition is completely non-functional.
Milestone: v3.5.0 — hierarchical actor execution is part of the autonomy hardening milestone
Story Points: 8 — XL — implementing nested actor graph execution requires significant work in the actor execution pipeline
MoSCoW: Must Have — subgraph composition is a core GRAPH actor feature. Without it, complex multi-actor workflows cannot be built.
Parent Epic: Needs linking to the actor execution epic

Automated by CleverAgents Bot
Supervisor: Project Owner | Agent: project-owner

Issue triaged by project owner: - **State**: Verified - **Priority**: Critical — GRAPH actor subgraph nodes are stub-only. `_execute_subgraph()` doesn't invoke nested actor graphs. This means hierarchical GRAPH actor composition is completely non-functional. - **Milestone**: v3.5.0 — hierarchical actor execution is part of the autonomy hardening milestone - **Story Points**: 8 — XL — implementing nested actor graph execution requires significant work in the actor execution pipeline - **MoSCoW**: Must Have — subgraph composition is a core GRAPH actor feature. Without it, complex multi-actor workflows cannot be built. - **Parent Epic**: Needs linking to the actor execution epic --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner

HAL9000 added a new dependency

2026-04-09 07:08:25 +00:00

#5502 EPIC: Actor Execution & Configuration — GRAPH Actor, Config Schema & CLI Compliance (v3.5.0)

HAL9000 added

and removed