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 agentmods add skills/null-shot/cloudflare-skills/agents-sdknpx skills add null-shot/cloudflare-skills --skill agents-sdkgit clone --depth 1 https://github.com/null-shot/cloudflare-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/null-shot/cloudflare-skills/agents-sdk)<a href="https://agentmods.dev/skills/null-shot/cloudflare-skills/agents-sdk"><img src="https://agentmods.dev/badge/skills/null-shot/cloudflare-skills/agents-sdk.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00056 | $0.01349 |
| Opus 5 | $0.00028 | $0.00674 |
| Sonnet 5 | $0.00011 | $0.00270 |
| Haiku 4.5 | $0.00006 | $0.00135 |
Grade A, and why
agents-sdk scanned grade A with 0 findings 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 5d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 161 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cloudflare Agents SDK
Build persistent, stateful AI agents on Cloudflare Workers using the agents npm package.
FIRST: Verify Installation
npm install agents
Agents require a binding in wrangler.jsonc:
{
"durable_objects": {
// "class_name" must match your Agent class name exactly
"bindings": [{ "name": "Counter", "class_name": "Counter" }]
},
"migrations": [
// Required: list all Agent classes for SQLite storage
{ "tag": "v1", "new_sqlite_classes": ["Counter"] }
]
}
Choosing an Agent Type
| Use Case | Base Class | Package |
|---|---|---|
| Custom state + RPC, no chat | Agent |
agents |
| Chat with message persistence | AIChatAgent |
@cloudflare/ai-chat |
| Building an MCP server | McpAgent |
agents/mcp |
Key Concepts
- Agent base class provides state, scheduling, RPC, MCP, and email capabilities
- AIChatAgent adds streaming chat with automatic message persistence and resumable streams
- Code Mode generates executable code instead of tool calls—reduces token usage significantly
- this.state / this.setState() - automatic persistence to SQLite, broadcasts to clients
- this.schedule() - schedule tasks at Date, delay (seconds), or cron expression
- @callable decorator - expose methods to clients via WebSocket RPC
Quick Reference
| Task | API |
|---|---|
| Persist state | this.setState({ count: 1 }) |
| Read state | this.state.count |
| Schedule task | this.schedule(60, "taskMethod", payload) |
| Schedule cron | this.schedule("0 * * * *", "hourlyTask") |
| Cancel schedule | this.cancelSchedule(id) |
| Queue task | this.queue("processItem", payload) |
| SQL query | this.sql`SELECT * FROM users WHERE id = ${id}` |
| RPC method | @callable() async myMethod() { ... } |
| Streaming RPC | @callable({ streaming: true }) async stream(res) { ... } |
Minimal Agent
import { Agent, routeAgentRequest, callable } from "agents";
type State = { count: number };
export class Counter extends Agent<Env, State> {
initialState = { count: 0 };
@callable()
increment() {
this.setState({ count: this.state.count + 1 });
return this.state.count;
}
}
export default {
fetch: (req, env) => routeAgentRequest(req, env) ?? new Response("Not found", { status: 404 })
};
What ships with it
5 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.
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.
- 5d ago First seen · 161 lines · 56 tokens per session scan A ffae4f573973
agents-sdk is a skill published in the GitHub repository null-shot/cloudflare-skills (0 stars, last pushed 7mo ago), licensed Apache-2.0. It adds 56 tokens to every session and 1,349 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It comes from a forked repository.
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