Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add secondsky/claude-skills --skill cloudflare-durable-objectsgit clone --depth 1 https://github.com/secondsky/claude-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/secondsky/claude-skills/cloudflare-durable-objects)<a href="https://agentmods.dev/skills/secondsky/claude-skills/cloudflare-durable-objects"><img src="https://agentmods.dev/badge/skills/secondsky/claude-skills/cloudflare-durable-objects/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/secondsky/claude-skills/cloudflare-durable-objects"><img src="https://agentmods.dev/badge/skills/secondsky/claude-skills/cloudflare-durable-objects.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Rogue Agent · line 528 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00043 | $0.05395 |
| Opus 5.5 | $0.00017 | $0.02158 |
| Sonnet 5.5 | $0.00009 | $0.01079 |
| Haiku 4.5 | $0.00004 | $0.00539 |
Grade A, and why
cloudflare-durable-objects scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
async fetch(request: Request, env: Env): Promise<Response> { How it starts
The opening of the file, as written. The whole thing — 581 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cloudflare Durable Objects
Status: Production Ready ✅ Last Updated: 2025-11-25 Dependencies: cloudflare-worker-base (recommended) Latest Versions: [email protected]+, @cloudflare/[email protected]+ Official Docs: https://developers.cloudflare.com/durable-objects/
Table of Contents
What are Durable Objects? • Quick Start • When to Load References • Class Structure • State API • WebSocket Hibernation • Alarms • RPC vs HTTP • Stubs & Routing • Migrations • Common Patterns • Critical Rules • Known Issues
What are Durable Objects?
Globally unique, stateful objects with single-point coordination, strong consistency (ACID), WebSocket Hibernation (thousands of connections), SQLite storage (1GB), and alarms API.
Use for: Chat rooms, multiplayer games, rate limiting, session management, leader election, stateful workflows
Quick Start (10 Minutes)
Option 1: Scaffold New DO Project
npm create cloudflare@latest my-durable-app -- \
--template=cloudflare/durable-objects-template --ts --git --deploy false
cd my-durable-app && bun install && npm run dev
Option 2: Add to Existing Worker
1. Install types:
bun add -d @cloudflare/workers-types
2. Create DO class (src/counter.ts):
import { DurableObject } from 'cloudflare:workers';
export class Counter extends DurableObject {
async increment(): Promise<number> {
let value: number = (await this.ctx.storage.get('value')) || 0;
await this.ctx.storage.put('value', ++value);
return value;
}
}
export default Counter; // CRITICAL
What ships with it
38 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- references/advanced-sql-patterns.md 16 KB
- references/alarms-api.md 6.5 KB
- references/best-practices.md 8.5 KB
- references/common-patterns.md 17 KB
- references/data-modeling.md 17 KB
- references/error-codes.md 7.7 KB
- references/gradual-deployments.md 14 KB
- references/migration-cheatsheet.md 3.2 KB
- references/migrations-guide.md 7.3 KB
- references/monitoring-debugging.md 18 KB
- references/performance-optimization.md 16 KB
- references/rpc-metadata.md 17 KB
- references/rpc-patterns.md 6.5 KB
- references/security-best-practices.md 16 KB
- references/state-api-reference.md 6.0 KB
- references/stubs-routing.md 11 KB
- references/top-errors.md 10 KB
- references/typescript-config.md 8.3 KB
- references/vitest-testing.md 18 KB
- references/websocket-hibernation.md 6.3 KB
- references/wrangler-commands.md 3.4 KB
- scripts/check-versions.sh 593 B runs code
- scripts/migration-generator.sh 13 KB runs code
- scripts/setup-vitest-do.sh 10 KB runs code
- scripts/validate-do-config.sh 10 KB runs code
- templates/alarms-api-do.ts 6.1 KB runs code
- templates/basic-do.ts 2.9 KB runs code
- templates/gradual-deployment-config.jsonc 10 KB
- templates/location-hints.ts 6.8 KB runs code
- templates/multi-do-coordination.ts 7.8 KB runs code
- templates/package.json 384 B
- templates/rpc-metadata-do.ts 11 KB runs code
- templates/rpc-vs-fetch.ts 6.0 KB runs code
- templates/state-api-patterns.ts 5.8 KB runs code
- templates/ttl-cleanup-do.ts 18 KB runs code
- templates/vitest-do-test.ts 12 KB runs code
- templates/websocket-hibernation-do.ts 6.0 KB runs code
- templates/wrangler-do-config.jsonc 2.0 KB
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 581 lines · 43 tokens per session scan A 8f1c9245551c
cloudflare-durable-objects is a skill published in the GitHub repository secondsky/claude-skills (231 stars, last pushed today), licensed MIT. It adds 43 tokens to every session and 5,395 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
Other skills, from other repositories
decide
A reusable decision procedure, and a copyable prototype for the guard that encodes it — derive the population, set one threshold by what being wrong costs, name the offender, and break it once to prove it can fail. Use when writing a check, guard, gate or validation of any kind, or when deciding whether something is…
remember
Record why something is the way it is — a decision and its reasoning, a lesson that cost time, or a standing constraint. Use when the reasoning behind a choice would be expensive to reconstruct later.
bootstrap
Set up chamnan in this repository for the first time — build the architecture index, measure how well the code describes itself, fill in missing file comments, and record a baseline. Run once per repo.
milestone
Record a change that reshaped the repository — what moved, why it was worth doing, and which areas it touched. Use after a migration, a rewrite, or a decision that changed how part of the system works.
resume
Write down where this stretch of work stopped, so the next session continues instead of restarting. Use at the end of a working session, or when handing the repository to someone else.
review
Review a change with what this repository knows about it — who depends on the file, which tests cover it, what broke here before, and what the repo has written down. Use before approving a diff, opening a PR, or when asked to review.