CtrlK
BlogDocsLog inGet started
Tessl Logo
SkillPublic

cloudflare-durable-objects

Cloudflare Durable Objects for stateful coordination and real-time apps. Use for chat, multiplayer games, WebSocket hibernation, or encountering class export, migration, alarm errors.

57

Quality

72%

Does it follow best practices?

Run evals on this skill

Adds up to 20 points to the overall score

View guide
SecuritybySnyk

Passed

No findings from the security scan

Fix and improve this skill with Tessl

tessl review fix ./plugins/cloudflare-durable-objects/skills/cloudflare-durable-objects/SKILL.md
SKILL.md
Quality
Evals
Security

Quality

Content

53%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

A well-organized overview with genuinely good progressive disclosure: every topic defers to a real, clearly-signaled one-level-deep reference file, and the trigger-keyword loading table is a best practice. The main weaknesses are duplicated rule sections that inflate tokens, a few non-executable code snippets, and — most seriously — prominent pointers to commands, agents, and a templates/ directory that do not exist in the bundle, plus no validation step before destructive migration operations.

Suggestions

Remove or gate the '/do-*' commands, 'Autonomous Agents', and 'templates/' sections — none of these exist in the bundle, so following them dead-ends the reader (or add the corresponding files).

Add a validation checkpoint before destructive migrations, e.g. 'run scripts/validate-do-config.sh, list affected classes, then apply deleted_classes' — this also lifts the workflow_clarity cap.

Deduplicate the Critical Rules / Known Issues / per-section ✅❌ lists into one canonical rules section, and fix the incomplete alarm example's undefined 'existingItems'.

DimensionReasoningScore

Conciseness

Mostly efficient — each section gives a compact pattern then defers detail to a reference file — but there is real duplication: rules appear in-line per-section and again verbatim in 'Critical Rules' and 'Known Issues Prevention', and the 'When to Load References' trigger lists largely repeat the per-section 'Load references/...' lines. Time-sensitive stamps ('Last Updated: 2025-11-25', 'wrangler@4.81.0+') sit in the header rather than a deprecation/versioning section, which the guidelines penalize. Not a 2: the body does not explain concepts Claude already knows and code dominates over prose.

3 / 5

Actionability

Much of the guidance is executable (Quick Start steps 1-4, wrangler.jsonc config, SQL counter, WebSocket hibernation pattern), but several snippets are incomplete: the alarm example references an undefined 'existingItems', the rate-limiter 'this.sessions.forEach' broadcast, and 'processBatch' is left abstract. More significantly, the body directs the reader to '/do-setup' ... '/do-optimize' commands, 'do-debugger'/'do-setup-assistant'/'do-pattern-implementer' agents, and a 'templates/' directory — none of which exist in the bundle. Not a 2: the core paths (scaffold, configure, call, deploy) are concrete and copy-paste ready.

3 / 5

Workflow Clarity

The Quick Start is a coherent install → create → configure → call → deploy sequence, but the skill's riskiest operations lack validation checkpoints: migrations include 'deleted_classes (⚠️ immediate deletion, cannot undo, all storage lost)' with no verify-before-delete step, and no validate-then-retry loop exists anywhere. Per the rubric's explicit cap, destructive/batch operations without validation cap workflow clarity at 3. Not a 2: sequences that do exist are well-defined with correct ordering and explicit ✅/❌ guardrails.

3 / 5

Progressive Disclosure

Strong structure: a dedicated 'When to Load References' section maps trigger keywords to files, each topic section ends with a one-level-deep 'Load references/X.md for...' pointer, and all 16 named reference files exist in references/ (a spot check of the listing confirms every cited path). Not a 5: the body points to non-existent bundle surfaces — the '/do-*' commands, the three named autonomous agents, and 'check templates/ for working examples' — which are dangling navigation, and the 4 scripts in scripts/ are never mentioned from the body.

4 / 5

Total

13

/

20

Passed

Description

82%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

A tight, well-targeted description that clearly answers both what the skill covers and when to use it, including error-driven triggers that catch debugging requests. Its only weakness is that it describes the domain and use cases rather than enumerating the concrete actions the skill performs.

Suggestions

Replace the purpose phrase 'for stateful coordination and real-time apps' with one or two verbs of what the skill does, e.g. 'Build and debug Cloudflare Durable Objects...'.

Add high-frequency natural triggers to the 'Use for' clause such as 'rate limiting, sessions, or DO storage' to round out trigger coverage.

DimensionReasoningScore

Specificity

The description names the domain ('Cloudflare Durable Objects for stateful coordination and real-time apps') and surfaces concrete features/use cases ('WebSocket hibernation', 'chat'), but never states actions the skill performs (build, implement, debug) — closest to 'names domain and 1-2 concrete actions, but not comprehensive'. Not a 4: there is no list of several specific actions, only a purpose phrase plus use-case nouns.

3 / 5

Completeness

Both parts are explicit: 'what' ('Cloudflare Durable Objects for stateful coordination and real-time apps') and 'when' ('Use for chat, multiplayer games, WebSocket hibernation, or encountering class export, migration, alarm errors') with concrete trigger phrases including error conditions. Not a 4: the 'when' clause is not merely serviceable — it enumerates specific use cases and specific error scenarios, matching the anchor-5 example structure.

5 / 5

Trigger Term Quality

Natural phrases users would say are present: 'chat', 'multiplayer games', 'WebSocket hibernation', 'class export', 'migration', 'alarm errors' — good coverage including error-shaped triggers. Not a 5: common variations a user would plausibly say are missing from the description itself, e.g. 'rate limiting', 'sessions', 'real-time app', or the bare phrase 'Durable Object'/'DO' as a troubleshooting trigger.

4 / 5

Distinctiveness Conflict Risk

The niche is unambiguous — Cloudflare Durable Objects with product-specific error triggers ('class export', 'migration', 'alarm errors') that no sibling skill would claim. Not a 4: overlap risk with adjacent Cloudflare Workers/KV skills is minimal because the triggers are keyed to DO-specific errors and APIs.

5 / 5

Total

17

/

20

Passed

Validation

81%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 13 / 16 Passed

Validation for skill structure

CriteriaDescriptionResult

skill_md_line_count

SKILL.md is long (581 lines); consider splitting into references/ and linking

Warning

metadata_version

'metadata.version' is missing

Warning

metadata_field

'metadata' should map string keys to string values

Warning

Total

13

/

16

Passed

Repository

secondsky/claude-skills

Path

plugins/cloudflare-durable-objects/skills/cloudflare-durable-objects/SKILL.md

Reviewed

Table of Contents

Is this your skill?

If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.