HsienW
Registry indexed
distributed-step-lock
Design and review distributed locks for agent step transitions. Use when preventing concurrent workers, duplicate resumes, retries, compensation, or external requests from mutating the same task or step state at the same time.
Overview
Design and review distributed locks for agent step transitions. Use when preventing concurrent workers, duplicate resumes, retries, compensation, or external requests from mutating the same task or step state at the same time.
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Distributed Step Lock
Skill Interface
- Name: distributed-step-lock.
- Description: Design and review distributed locks for agent step transitions when concurrent workers, duplicate resumes, retries, compensation, or external requests may mutate the same task or step state at the same time.
- Parameters: Step identifier, lock owner, TTL, transition guard, allowed state transition, lock store behavior, retry policy, failure behavior, event names, and concurrency verification cases.
- Instructions: Use this skill before changing shared task or step state from multiple runtimes. Acquire a lock, verify owner on release and extension, use compare-and-swap as a second guard, define TTL behavior, and test contention, expiry, owner mismatch, and lock store outage.
Idempotency prevents duplicate side effects for the same key. It does not by itself prevent two workers from racing on the same step transition. Use a lock plus a durable compare-and-swap guard.
Lock Interface
type StepLock = {
acquire(stepId: string, owner: string, ttlMs: number): Promise<boolean>;
release(stepId: string, owner: string): Promise<void>;
extend(stepId: string, owner: string, ttlMs: number): Promise<boolean>;
};
type StepTransitionGuard = {
transition(
stepId: string,
from: StepStatus,
to: StepStatus,
owner: string
): Promise<TransitionResult>;
};
Rules
- Acquire the lock before changing step state.
- Use owner identity when releasing or extending a lock.
- Use a TTL so crashed workers do not create permanent locks.
- Renew the lock for long-running steps.
- Reject release attempts from a different owner.
- Use a database compare-and-swap transition as a second line of defense.
- Emit structured events for lock acquired, contended, extended, released, and expired.
Failure Behavior
- Lock unavailable: return a retryable concurrency result or wait according to policy.
- Lock expired during work: stop mutation or revalidate ownership before committing.
- Durable transition mismatch: do not overwrite; reload state and decide the next action.
- Lock store unavailable: degrade according to safety policy, usually by rejecting mutation rather than allowing unsafe concurrency.
Verification
Test two concurrent workers, owner mismatch on release, TTL expiry after worker crash, lock extension, transition compare-and-swap failure, lock store outage, compensation racing with normal flow, and resume racing with retry.
File metadata
name: distributed-step-lock description: Design and review distributed locks for agent step transitions. Use when preventing concurrent workers, duplicate resumes, retries, compensation, or external requests from mutating the same task or step state at the same time.
View original text
---
name: distributed-step-lock
description: Design and review distributed locks for agent step transitions. Use when preventing concurrent workers, duplicate resumes, retries, compensation, or external requests from mutating the same task or step state at the same time.
---
# Distributed Step Lock
## Skill Interface
- Name: distributed-step-lock.
- Description: Design and review distributed locks for agent step transitions when concurrent workers, duplicate resumes, retries, compensation, or external requests may mutate the same task or step state at the same time.
- Parameters: Step identifier, lock owner, TTL, transition guard, allowed state transition, lock store behavior, retry policy, failure behavior, event names, and concurrency verification cases.
- Instructions: Use this skill before changing shared task or step state from multiple runtimes. Acquire a lock, verify owner on release and extension, use compare-and-swap as a second guard, define TTL behavior, and test contention, expiry, owner mismatch, and lock store outage.
Idempotency prevents duplicate side effects for the same key. It does not by
itself prevent two workers from racing on the same step transition. Use a lock
plus a durable compare-and-swap guard.
## Lock Interface
```ts
type StepLock = {
acquire(stepId: string, owner: string, ttlMs: number): Promise<boolean>;
release(stepId: string, owner: string): Promise<void>;
extend(stepId: string, owner: string, ttlMs: number): Promise<boolean>;
};
type StepTransitionGuard = {
transition(
stepId: string,
from: StepStatus,
to: StepStatus,
owner: string
): Promise<TransitionResult>;
};
```
## Rules
- Acquire the lock before changing step state.
- Use owner identity when releasing or extending a lock.
- Use a TTL so crashed workers do not create permanent locks.
- Renew the lock for long-running steps.
- Reject release attempts from a different owner.
- Use a database compare-and-swap transition as a second line of defense.
- Emit structured events for lock acquired, contended, extended, released, and
expired.
## Failure Behavior
- Lock unavailable: return a retryable concurrency result or wait according to
policy.
- Lock expired during work: stop mutation or revalidate ownership before
committing.
- Durable transition mismatch: do not overwrite; reload state and decide the
next action.
- Lock store unavailable: degrade according to safety policy, usually by
rejecting mutation rather than allowing unsafe concurrency.
## Verification
Test two concurrent workers, owner mismatch on release, TTL expiry after worker
crash, lock extension, transition compare-and-swap failure, lock store outage,
compensation racing with normal flow, and resume racing with retry.
Review the source
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- Requirements have not been confirmed. Check the source for agent, API and service charges.
- License
- MIT
- Price unconfirmed
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Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
- Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required
- Low GitHub adoption signal
- AI review approval is missing
- This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.
- Quality score needs review
- GitHub adoption: 23 GitHub stars
- Stars/forks activity: 23 stars, 0 forks; issue activity unavailable in current metadata
- Review status: AI review approval is missing
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
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- 3Check the output and changed files. Report only what actually ran; keep the source revision for reproduction.
Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Source & usage notes
IndexedStatic Checked
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
- Source repository
- HsienW/ai-agent-engineering-playbook
- License
- MIT
- Version
- Unknown
- Last GitHub push
- Sep 20, 2026
- Registry updated
- Sep 20, 2026
Version reported in registry metadata; check source releases before relying on it.
Quality
55/100
Promising
Trust
64/100
Sandbox only
Audit
75/100
Risky
- Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required
- Low GitHub adoption signal
- AI review approval is missing
- This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.
- Quality score needs review
- GitHub adoption: 23 GitHub stars
- Stars/forks activity: 23 stars, 0 forks; issue activity unavailable in current metadata
- Review status: AI review approval is missing
- Verified installs
- —
- Outcomes
- —
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.
Agent access
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
More details
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}For the creator
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