Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/MohammadShehadeh/agent-skillsnpx agentmods add skills/mohammadshehadeh/agent-skills/agent-skills-serviceWrote 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/mohammadshehadeh/agent-skills/agent-skills-service)<a href="https://agentmods.dev/skills/mohammadshehadeh/agent-skills/agent-skills-service"><img src="https://agentmods.dev/badge/skills/mohammadshehadeh/agent-skills/agent-skills-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/mohammadshehadeh/agent-skills/agent-skills-service"><img src="https://agentmods.dev/badge/skills/mohammadshehadeh/agent-skills/agent-skills-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 | $0.00058 | $0.01500 |
| Opus 5 | $0.00029 | $0.00750 |
| Sonnet 5 | $0.00012 | $0.00300 |
| Haiku 4.5 | $0.00006 | $0.00150 |
Grade A, and why
agent-skills-service 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 12d 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 — 128 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Service & Boundary
How to wrap external chaos behind a typed boundary. Full rules in references/services.md and references/errors.md. Load agent-skills-conventions for naming, structure, and testing.
1. Inspect the repo
Before creating files, find what already exists:
Result<T, K>type — reuse it; define once if missing (types/result.ts)- Shared
httpclient (lib/http.ts) — reuse it; the service never callsfetchdirectly. Define once if missing (owns base URL, auth headers, JSON, timeout, status→errorKeymapping) errorKeyFromResponse/errorKeyFromExceptionhelpers — reuse fromlib/error-keys.ts(the client uses these; a raw-SDK service that can't go throughhttpuses them directly)- Typed
env.ts— never readprocess.envin the service - Existing services in the same feature — match file location, naming, and how they call
http
2. Define the operation contract
Present this before writing code:
| Item | Example |
|---|---|
| Operation name | submitContactMessage |
| Success shape | null or domain type Invoice |
| Payload | zod schema → z.infer type |
| Error keys (narrowed) | 'CONTACT_SUBMIT_FAILED' | SharedErrorKey + reason keys like 'CONTACT_RATE_LIMITED' when known |
| External system | REST endpoint, DB, vendor SDK |
Add new keys to the feature's constants/error-keys.ts. Name reason when known (INVOICE_NOT_FOUND on 404); operation catch-all only when reason is unknown.
3. Separate decisions from actions
| Layer | Lives in | Tested |
|---|---|---|
| Pure mapping / validation logic | lib/ — parseInvoice, buildQuery |
Yes — colocated *.test.ts |
| I/O shell | services/ or actions/ |
Integration/manual; logic stays in lib/ |
Vendor DTO shapes never leave the service file — map to internal domain types inside.
4. Service function template
The service goes through the shared http client (lib/http.ts) — no fetch, no headers, no try/catch, no timeout in the service. It names the endpoint, narrows the keys, and maps the DTO:
What ships with it
2 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.
- 12d ago First seen · 128 lines · 58 tokens per session scan A ff947407fad6
agent-skills-service is a skill published in the GitHub repository MohammadShehadeh/agent-skills (2 stars, last pushed 28d ago), licensed MIT. It adds 58 tokens to every session and 1,500 once invoked, about $0.0003 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 2026-08-31.
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