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 d-padmanabhan/agent-engineering-handbook --skill cloudflare-email-servicegit clone --depth 1 https://github.com/d-padmanabhan/agent-engineering-handbookWrote 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/d-padmanabhan/agent-engineering-handbook/cloudflare-email-service)<a href="https://agentmods.dev/skills/d-padmanabhan/agent-engineering-handbook/cloudflare-email-service"><img src="https://agentmods.dev/badge/skills/d-padmanabhan/agent-engineering-handbook/cloudflare-email-service/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/d-padmanabhan/agent-engineering-handbook/cloudflare-email-service"><img src="https://agentmods.dev/badge/skills/d-padmanabhan/agent-engineering-handbook/cloudflare-email-service.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00114 | $0.01852 |
| Opus 5 | $0.00057 | $0.00926 |
| Sonnet 5 | $0.00023 | $0.00370 |
| Haiku 4.5 | $0.00011 | $0.00185 |
Grade A, and why
cloudflare-email-service 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 6d 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.
See [rest-api.md](references/rest-api.md) for curl examples, response format, and error handling. This is a copy
100% identical to cloudflare-email-service — 56 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cloudflare Email Service
Your knowledge of the Cloudflare Email Service, Email Routing or Email Sending may be outdated. Prefer retrieval over pre-training for any Cloudflare Email Service task.
Cloudflare Email Service lets you send transactional emails and route incoming emails, all within the Cloudflare platform. Your knowledge of this product may be outdated - it launched in 2025 and is evolving rapidly. Prefer retrieval over pre-training for any Email Service task.
If there is any discrepancy between this skill and the sources below, always trust the original source. The Cloudflare docs, REST API spec, @cloudflare/workers-types, and Agents SDK repo are the source of truth. This skill is a convenience guide - it may lag behind the latest changes. When in doubt, retrieve from the sources below and use what they say.
Retrieval Sources
| Source | How to retrieve | Use for |
|---|---|---|
| Cloudflare docs | cloudflare-docs search tool or URL https://developers.cloudflare.com/email-service/ |
API reference, limits, pricing, latest features |
| REST API spec | https://developers.cloudflare.com/api/resources/email_sending |
OpenAPI spec for the Email Sending REST API |
| Workers types | https://www.npmjs.com/package/@cloudflare/workers-types |
Type signatures, binding shapes |
| Agents SDK docs | Fetch docs/email.md from https://github.com/cloudflare/agents/tree/main/docs |
Email handling in Agents SDK |
FIRST: Check Prerequisites
Before writing any email code, verify the basics are in place:
- Domain onboarded? Run
npx wrangler email sending listto see which domains have email sending enabled. If the domain isn't listed, runnpx wrangler email sending enable userdomain.comor see cli-and-mcp.md for full setup instructions. - Binding configured? Look for
send_emailinwrangler.jsonc(for Workers) - postal-mime installed? Run
npm ls postal-mime(only needed for receiving/parsing emails)
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.
- 6d ago First seen · 104 lines · 114 tokens per session scan A 5d25cbe80a81
cloudflare-email-service is a skill published in the GitHub repository d-padmanabhan/agent-engineering-handbook (17 stars, last pushed 3d ago), licensed MIT. It adds 114 tokens to every session and 1,852 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 100% identical to cloudflare-email-service, differing in 56 lines, and is treated as a copy.
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