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 oborchers/fractional-cto --skill documentation-and-dxgit clone --depth 1 https://github.com/oborchers/fractional-ctoWrote 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/oborchers/fractional-cto/documentation-and-dx)<a href="https://agentmods.dev/skills/oborchers/fractional-cto/documentation-and-dx"><img src="https://agentmods.dev/badge/skills/oborchers/fractional-cto/documentation-and-dx/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/oborchers/fractional-cto/documentation-and-dx"><img src="https://agentmods.dev/badge/skills/oborchers/fractional-cto/documentation-and-dx.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 | $0.00075 | $0.02736 |
| Opus 5 | $0.00037 | $0.01368 |
| Sonnet 5 | $0.00015 | $0.00547 |
| Haiku 4.5 | $0.00007 | $0.00274 |
Grade A, and why
documentation-and-dx 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 11d 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 — 190 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Your Docs Are Your Best Salesperson
Documentation is the #1 factor in API adoption. SmartBear surveys consistently show that "accurate and detailed documentation" is the top requirement developers cite when evaluating an API. Stripe and Twilio did not win because they had better infrastructure -- they won because their docs made developers productive in minutes, not days. Every hour you invest in documentation returns tenfold in reduced support tickets, faster integration times, and higher conversion from free-tier to paid.
Three-Panel Layout
Adopt the Stripe three-panel pattern: navigation on the left, conceptual content in the center, runnable code on the right. This layout lets developers read context and copy code simultaneously without scrolling or switching tabs.
Navigation panel rules:
- Organize by task ("Accept a Payment", "Create a Subscription"), not by HTTP method or endpoint path
- Group related tasks under domain headings (Payments, Billing, Identity)
- Keep the nav tree to two levels maximum -- a third level means the information architecture needs restructuring
Content panel rules:
- Open every page with a one-sentence description of what the endpoint or concept does
- Show the minimal request first, then reveal optional parameters in collapsible sections
- Cross-link aggressively: every reference page links to a relevant tutorial, and every tutorial links back to the reference
Code panel rules:
- Persist the developer's language selection across the entire docs site using a cookie or local storage
- When a developer selects Python, every code example site-wide switches to Python instantly
Time to First API Call Under 5 Minutes
"Time to first API call" (TTFAC) is the single most important developer experience metric. Stripe achieves approximately 3 minutes. AWS takes 30+ minutes. The difference is not complexity -- it is onboarding design.
The ideal onboarding flow:
- Sign up with email and password -- no credit card required
- Dashboard immediately shows API keys with no email verification required for sandbox access
- A "Get Started" page presents a cURL command pre-filled with the developer's actual test key
- The developer pastes the command, sees a real response, and feels accomplishment
- "Next steps" links lead to SDK quickstarts in their chosen language
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.
- 11d ago First seen · 190 lines · 75 tokens per session scan A 1b35ca6d5093
documentation-and-dx is a skill published in the GitHub repository oborchers/fractional-cto (30 stars, last pushed 1mo ago), licensed MIT. It adds 75 tokens to every session and 2,736 once invoked, about $0.0004 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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