feat: implement parallel action execution #6108#6654
feat: implement parallel action execution #6108#6654jhawpetoss6-collab wants to merge 1 commit intoelizaOS:developfrom
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| const promises = actions.map(action => | ||
| action.handler(runtime, message, state) | ||
| ); | ||
| return Promise.all(promises); |
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Promise.all fail-fast silently discards other results on first error
Promise.all rejects immediately when any single action throws, abandoning all already-in-flight promises and discarding their results. For a parallel action orchestrator this is unsafe: a transient failure in one action causes every other action's output to be lost with no way to know which succeeded and which failed.
Promise.allSettled resolves after all promises settle and gives per-action success/failure status, which is the correct primitive here:
| return Promise.all(promises); | |
| return Promise.allSettled(promises); |
The caller can then inspect .status === 'fulfilled' / 'rejected' for each result and handle partial failures gracefully.
| /** | ||
| * Orchestrates the execution of multiple actions in parallel. | ||
| * Prevents race conditions while maximizing agent throughput. |
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state object is mutated concurrently
All actions receive the exact same state reference and run in parallel. Actions that read from and write to state will have a data race: later writes from one action can overwrite the results of another, or actions can observe partially-written state from a sibling. The JSDoc comment "Prevents race conditions" is the opposite of what happens here.
Pass a shallow copy to each action to isolate mutations:
| /** | |
| * Orchestrates the execution of multiple actions in parallel. | |
| * Prevents race conditions while maximizing agent throughput. | |
| const promises = actions.map(action => | |
| action.handler(runtime, message, { ...state }) | |
| ); |
Note: if state contains nested mutable objects a deep clone (structuredClone(state)) may be needed depending on how actions use it.
| static async runParallel( | ||
| runtime: IAgentRuntime, | ||
| actions: Action[], | ||
| message: Memory, | ||
| state: State | ||
| ) { | ||
| const promises = actions.map(action => | ||
| action.handler(runtime, message, state) | ||
| ); | ||
| return Promise.all(promises); |
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validate guard
The method has no explicit return type. It should also call each action's validate method before executing it, which is how the rest of ElizaOS uses actions (see processActions in the runtime). Running handler on an action whose validate returns false can produce unexpected side-effects.
| static async runParallel( | |
| runtime: IAgentRuntime, | |
| actions: Action[], | |
| message: Memory, | |
| state: State | |
| ) { | |
| const promises = actions.map(action => | |
| action.handler(runtime, message, state) | |
| ); | |
| return Promise.all(promises); | |
| static async runParallel( | |
| runtime: IAgentRuntime, | |
| actions: Action[], | |
| message: Memory, | |
| state: State | |
| ): Promise<PromiseSettledResult<unknown>[]> { | |
| const validActions = await Promise.all( | |
| actions.map(async (action) => ({ | |
| action, | |
| valid: await action.validate(runtime, message, state), | |
| })) | |
| ); | |
| const promises = validActions | |
| .filter(({ valid }) => valid) | |
| .map(({ action }) => | |
| action.handler(runtime, message, { ...state }) | |
| ); | |
| return Promise.allSettled(promises); | |
| } |
| state: State | ||
| ) { | ||
| const promises = actions.map(action => | ||
| action.handler(runtime, message, state) |
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handler call signature omits callback and other params
The Handler type in ElizaOS core accepts six parameters: runtime, message, state, options, a HandlerCallback, and responses. This call passes only three.
The HandlerCallback is the primary mechanism actions use to send responses back to the user mid-execution. Passing undefined for it means any action that invokes its callback will silently fail to deliver its response, causing data loss for the caller.
runParallel should accept and forward options, a callback factory (or per-action callbacks), and responses so that handlers receive all the context they depend on.
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We reviewed this and did not carry it. The current implementation is still not merge-ready: parallel execution semantics, failure handling, and action integration are not sufficiently worked through yet, and there are no tests proving correct runtime behavior. Please resubmit with a real implementation and end-to-end validation rather than a placeholder manager surface. |
2 participants
This PR introduces the
ParallelActionManagerto ElizaOS core, enabling agents to execute multiple actions simultaneously.Benefits:
/claim #6108
Greptile Summary
This PR introduces a
ParallelActionManagerclass topackages/core/src/orchestrators/that aims to run multiple ElizaOS actions concurrently via a single staticrunParallelmethod. While the goal of reducing latency for multi-step tasks is worthwhile, the implementation has several unresolved issues flagged in prior review rounds, and one additional gap identified here.Key issues remaining:
action.handleraccepts six parameters (runtime,message,state,options,HandlerCallback,responses); the current call passes only three. Any action that uses itscallbackto deliver responses will silently drop those responses.Promise.allfail-fast — a single action failure abandons all in-flight sibling actions and discards their results;Promise.allSettledis the correct primitive for a parallel orchestrator.statereference — all actions receive the samestateobject and mutate it concurrently, directly contradicting the JSDoc claim of "Prevents race conditions."validateguard — the method skips each action'svalidate()step, which is the standard ElizaOS contract before invoking a handler.ParallelActionManageris never re-exported frompackages/core/src/index.ts, making it unreachable by any consumer of@elizaos/core.Confidence Score: 1/5
Important Files Changed
Sequence Diagram
sequenceDiagram participant Caller participant ParallelActionManager participant Action1 participant Action2 participant ActionN Caller->>ParallelActionManager: runParallel(runtime, actions, message, state) Note over ParallelActionManager: actions.map(a => a.handler(runtime, message, state)) par Parallel execution (shared state ref) ParallelActionManager->>Action1: handler(runtime, message, state) ParallelActionManager->>Action2: handler(runtime, message, state) ParallelActionManager->>ActionN: handler(runtime, message, state) end Note over ParallelActionManager: Promise.all — fails fast on first rejection alt All succeed Action1-->>ParallelActionManager: result1 Action2-->>ParallelActionManager: result2 ActionN-->>ParallelActionManager: resultN ParallelActionManager-->>Caller: [result1, result2, resultN] else Any action rejects Action2-->>ParallelActionManager: throws Error Note over ParallelActionManager: Action1 & ActionN results discarded ParallelActionManager-->>Caller: rejects (data loss) endReviews (2): Last reviewed commit: "feat: implement ParallelActionManager fo..." | Re-trigger Greptile