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 trycourier/courier-skills --skill couriergit clone --depth 1 https://github.com/trycourier/courier-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/trycourier/courier-skills/courier)<a href="https://agentmods.dev/skills/trycourier/courier-skills/courier"><img src="https://agentmods.dev/badge/skills/trycourier/courier-skills/courier/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/trycourier/courier-skills/courier"><img src="https://agentmods.dev/badge/skills/trycourier/courier-skills/courier.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00045 | $0.04356 |
| Opus 5 | $0.00023 | $0.02178 |
| Sonnet 5 | $0.00009 | $0.00871 |
| Haiku 4.5 | $0.00005 | $0.00436 |
Grade A, and why
courier 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 — 241 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Courier
Integrate Courier, add notification features, and debug delivery problems across email, SMS, push, in-app inbox, Slack, Teams, and WhatsApp.
The Model
One send call does the whole job. You address a user (or list, audience, or tenant), content comes from a template or inline, routing picks the channels, and preferences gate delivery. Courier renders, routes, and delivers; your app supplies the trigger and the data.
Multi-step flows (anything with a delay, a branch, or aggregation) are journeys, defined as JSON and invoked by API.
How to Use This Skill
- Route first. Where to Look picks the 1–2 files for the task. Don't read the tree.
- Ask when the request is ambiguous. Channel? Transactional or lifecycle? New code or existing? Which language? Skip the questions when the request is already specific.
- Verify shapes against a live source rather than memory. The installed SDK's own types are ground truth.
- Apply the rules. Universal Rules and each file's Quick Reference are constraints, not suggestions. (
sdk-reference.mdis a lookup table and has none.)
If the project already has @trycourier/courier or trycourier installed, skip quickstart's install steps and assume client exists.
Addressing a Send
message.to accepts one of:
| Form | Sends to |
|---|---|
{ user_id: "user-123" } |
A stored user profile. The usual case |
{ email: "…" } / { phone_number: "…" } |
An inline recipient, no profile required |
{ list_id: "…" } |
Every subscriber of a list |
{ list_pattern: "eng.*" } |
Every list matching the pattern |
{ audience_id: "…" } |
A filter Courier evaluates and keeps current |
| An array of the above | Multiple recipients in one call, with a hard cap of 500 |
Above 500 ad-hoc recipients, a to array returns 400 message.to has N recipients. Max is 500.
Use a list, an audience, or a Bulk API job instead.
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/channels/email.md 12 KB
- references/channels/inbox.md 8.7 KB
- references/channels/ms-teams.md 17 KB
- references/channels/push.md 15 KB
- references/channels/slack.md 18 KB
- references/channels/sms.md 10 KB
- references/channels/whatsapp.md 14 KB
- references/guides/audiences.md 3.5 KB
- references/guides/batching.md 8.3 KB
- references/guides/brands.md 4.4 KB
- references/guides/bulk.md 8.9 KB
- references/guides/cli.md 15 KB
- references/guides/elemental.md 21 KB
- references/guides/journeys.md 46 KB
- references/guides/mcp.md 17 KB
- references/guides/metrics.md 9.0 KB
- references/guides/multi-channel.md 19 KB
- references/guides/patterns.md 17 KB
- references/guides/preferences.md 21 KB
- references/guides/providers.md 10 KB
- references/guides/quickstart.md 10.0 KB
- references/guides/reliability.md 11 KB
- references/guides/routing-strategies.md 14 KB
- references/guides/scheduling.md 3.8 KB
- references/guides/templates-as-code.md 7.2 KB
- references/guides/templates.md 32 KB
- references/guides/tenants.md 7.2 KB
- references/guides/throttling.md 4.2 KB
- references/guides/webhooks.md 14 KB
- references/inbox/auth.md 4.6 KB
- references/inbox/legacy-v7.md 6.7 KB
- references/inbox/react-native.md 2.2 KB
- references/inbox/react.md 8.9 KB
- references/inbox/rendering.md 10 KB
- references/inbox/web-components.md 8.2 KB
- references/lifecycle-marketing.md 5.6 KB
- references/sdk-reference.md 8.1 KB
- references/transactional.md 6.8 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.
- 5d ago Changed · +7 lines d88fb72b2fe5
- 9d ago First seen · 234 lines · 45 tokens per session scan A acb38b9cbed6
courier is a skill published in the GitHub repository trycourier/courier-skills (13 stars, last pushed 5d ago), licensed MIT. It adds 45 tokens to every session and 4,356 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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