LockMyAction vs. Database Idempotency: Which Should an Agent Use?
Compare LockMyAction with database unique constraints, provider idempotency keys, and in-process locks for retry-safe AI-agent actions.
Short answer
Use your own database when idempotency is core domain logic and every executor shares that database. Use LockMyAction when multiple agents, runtimes, or providers need a small independent action-identity and locking service. Use provider-native idempotency as an additional layer whenever it exists.
The failure this prevents
The difficult part is not creating a row. It is defining equivalent intent, handling races, retaining completed-action protection, recovering from stale locks, and ensuring every executor follows the same rule.
Recommended workflow
- Define the exact side effect and the arguments that make two requests equivalent.
- Check whether the provider already offers a durable idempotency key.
- Decide whether every executor can reliably share your transactional database.
- Choose the smallest control whose failure modes you can monitor and recover.
- Test parallel acquisition, process crashes, stale locks, completion, and uncertain outcomes.
Working starting point
Decision shortcut: - One application + shared transactional DB + domain expertise: build it there. - Many agents/runtimes/providers: consider LockMyAction. - Provider idempotency available: use it in either design. - Authorization required: add a separate approval or policy control.
Relevant product: LockMyAction · REST + MCP
Reproducible example
Compare three designs under a crash-and-retry test
A worker writes “refund started,” calls a payment provider, and crashes before saving the response. The same job is delivered to a different runtime. The evaluation asks where equivalent intent, atomic acquisition, completion retention, and unknown-outcome recovery live.
- Expected behavior
- A shared transactional database can be strongest when the refund invariant belongs to one application. Provider idempotency protects the provider call when its retention matches the retry window. An external action lock is useful when several runtimes need common portable state. Mature systems may combine all three.
- What it teaches
- The correct comparison is about failure domains and ownership, not which API has fewer lines of sample code. Any option that invents a fresh identity after an uncertain outcome can still duplicate the side effect.
Production verification checklist
- Test concurrent acquisition, process death, delayed retries, and completed-action retention.
- Document which system is authoritative when the provider result is unknown.
- Verify that authorization and spending policy remain independent of the idempotency choice.
Decision rule
Idempotency prevents duplicate execution; it is not a substitute for authorization, spending limits, validation, or reconciliation.
Good fit
- You want one external state service across agent frameworks.
- You need canonical action fingerprints instead of caller-invented keys.
- You prefer a narrowly scoped API over owning lock tables and expiry logic.
Use another approach when
- Your database already expresses the invariant transactionally at the domain record.
- Network dependence on an external lock service is unacceptable for this path.
- You need custom multi-row transactions that cannot be separated from business state.
Options compared
| Option | Strength | Important limitation | Best fit |
|---|---|---|---|
| Database unique constraint | Strong inside one transactional domain | Every executor must share schema and semantics | Core application invariants |
| Redis SET NX | Fast distributed primitive | You own canonical identity, expiry, completion, and recovery | Teams with mature Redis operations |
| Provider key | Protects at the side-effect provider | Provider-specific retention and coverage | Always when supported |
| LockMyAction | Portable intent fingerprint and lifecycle | External dependency; not a business transaction | Cross-agent orchestration |
Implementation cautions
- Avoid split-brain designs where different workers choose different keys.
- Document the retention period for completed actions.
- Treat lock-service unavailability as fail closed for consequential actions.
Frequently asked questions
Can LockMyAction replace a database transaction?
No. It coordinates action identity and execution state; it does not atomically update your domain records.
Can I combine the approaches?
Yes. A common design uses an independent workflow lock, a provider idempotency key, and a local transaction for domain state.
Which is cheaper?
A small local implementation can be cheaper until operational edge cases, multiple runtimes, or maintenance become material.
How this guidance was reviewed
The product behavior described here is checked against ScrubMyText's public OpenAPI contract and automated contract tests. The worked example is synthetic and contains no customer data. Recommendations separate verified product behavior from broader implementation judgment, and every limitation remains visible rather than being converted into a marketing claim.
Related decisions
Next step
Use the product page for exact limitations and access requirements, then copy the corresponding REST or MCP workflow.