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 OutlineDriven/outline-driven-development --skill fastify-production-hardeninggit clone --depth 1 https://github.com/OutlineDriven/outline-driven-developmentWrote 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/outlinedriven/outline-driven-development/fastify-production-hardening)<a href="https://agentmods.dev/skills/outlinedriven/outline-driven-development/fastify-production-hardening"><img src="https://agentmods.dev/badge/skills/outlinedriven/outline-driven-development/fastify-production-hardening/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/outlinedriven/outline-driven-development/fastify-production-hardening"><img src="https://agentmods.dev/badge/skills/outlinedriven/outline-driven-development/fastify-production-hardening.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 | $0.00065 | $0.01079 |
| Opus 5 | $0.00032 | $0.00540 |
| Sonnet 5 | $0.00013 | $0.00216 |
| Haiku 4.5 | $0.00006 | $0.00108 |
Grade A, and why
fastify-production-hardening 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 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.
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 — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Fastify production hardening
Contract
| Field | Bound contract |
|---|---|
| Trigger | Preparing a Fastify service for production load and exposure: timeouts, payload limits, overload shedding, rate limiting, CORS and security headers, proxying, SIGTERM draining, performance baseline. |
| Authority | Reversible local: edit only the service's hardening config files and run load/profiling checks against a local or staging target. Roll back by reverting the edited config files to their prior VCS revision. |
| Side effect | Local writes to hardening config; runs load/profiling checks that generate traffic against the target. |
| Done | All five method stages applied and verified: base limits set, overload shedding and rate limiting active, CORS and security headers configured with conditional proxy safety, graceful shutdown drains on SIGTERM, and a performance baseline committed alongside the config. |
Inputs
Required: a Fastify service codebase with a server entry point and its config file(s) under VCS. Optional: a target base URL for load/profiling checks (defaults to a local instance the operator starts); expected request rate or SLO threshold for the baseline.
Procedure
-
Base hardening limits. Read the current server entry point and config to inventory which hardening concerns are already set. Set
connectionTimeout,keepAliveTimeout,requestTimeout,bodyLimit, andmaxParamLengthto production values. Done when: timeouts and payload limits are set in the server options. -
Overload shedding and rate limiting. Register
@fastify/under-pressure(or equivalent memory/heap shedding) with a max heap or RSS threshold that returns 503 under pressure. Register@fastify/rate-limitwith a global max and time window, plus per-route overrides for expensive endpoints. SettrustProxyso the limiter and logs see the real client IP behind a reverse proxy. Done when: under-pressure shedding returns 503 under load and rate limiting is registered with global max, time window, per-route overrides, andtrustProxyset.
What ships with it
1 file 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 · 45 lines · 65 tokens per session scan A cb94d7b38d49
fastify-production-hardening is a skill published in the GitHub repository OutlineDriven/outline-driven-development (52 stars, last pushed 4d ago), licensed Apache-2.0. It adds 65 tokens to every session and 1,079 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 2026-09-03.
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