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Evidence record · captured 2026-10-10

Cloudflare Durable Objects

Focused patterns for strongly consistent, per-entity coordination with Durable Objects, covering RPC, SQLite storage, alarms, deterministic routing, migrations, and anti-patterns.

Official publisherUnverifiedSource reviewedBehavior not tested
Source review

Editorial assessment

This is a source-only assessment. It does not claim runtime or security testing.

What it does

The source frames Durable Objects around coordination atoms and strong consistency, then gives a compact implementation pattern for deterministic stubs, SQLite-backed state, RPC methods, alarms, and migrations.

Best for

  • Chat rooms, collaborative state, booking, and inventory coordination
  • Per-tenant or per-entity state that must serialize updates
  • Reviewing Durable Object storage and routing choices

Strengths in the source

  • Explains both positive use cases and explicit non-use cases.
  • Prioritizes persistence before in-memory caching and warns about concurrency-blocking misuse.
  • Connects class design to the required Wrangler migration and binding configuration.

Limitations

  • The compact SKILL.md delegates testing and advanced runtime detail to references.
  • Sharding quality still depends on choosing a sound entity key for the product.
  • No load, alarm, or concurrency behavior was executed in this review.

When not to use it

  • Stateless request handling
  • High-fan-out independent work with no coordination boundary

Reviewed by Retenta editorial on 2026-10-10; scope: source only.

Files included in this review
  • skills/durable-objects/SKILL.md
  • README.md
  • LICENSE

Evidence and boundaries

Execution · not tested

Retenta reviewed the pinned source but did not install or execute this skill.

Security · not tested

No sandbox run, dependency audit, or independent security assessment is claimed.

Pinned publisher source
skills/durable-objects/SKILL.md
Revision
c430dd965cea3a8faf0ef035e3b3d73b38518081
License evidence
Apache-2.0The pinned repository root LICENSE is the Apache License, Version 2.0.
Last source change
2026-10-01
Independent verification
The source is controlled by Cloudflare; Retenta has not independently verified its runtime behavior or security.
Upstream repository
Open publisher repository

Compatibility

Agent Skills clients

documented

Cloudflare documents installation paths for Codex, Claude Code, VS Code/Copilot, Cursor, and other Agent Skills clients.

Requirements and access

  • A Cloudflare Workers project
  • A Durable Object binding and SQLite-class migration
  • A workload with a clear coordination key

Referenced tools

Cloudflare documentation retrievalCloudflare Vitest integration

Install from the source

Cloudflare documents this command for agents that support the Agent Skills standard; it installs the repository collection, not only this record.

Download the pinned SKILL.md Apache-2.0 license text
Verify the publisher's install documentation

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Publisher-documented Agent Skills install

npx skills add https://github.com/cloudflare/skills

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