What is ficuslink
Onboarding overview of ficuslink — what it is, how the reference model works, the five resource types, and which AI channels can fetch it today.
# What is ficuslink
ficuslink is where AI agents do expert-level work without installation, by fetching one URL.
## The one-line usage
> "Build me a Todo app. Reference ficuslink.com."
That single phrase compresses three steps — prompt engineering, workflow design, and result acquisition — into a single fetch.
## How it works
When an AI sees a `ficuslink.com/...` URL in a user's prompt, it fetches the resource directly via HTTP and uses the returned content as expert context. No setup, no auth, no plugin install.
The primary endpoint is `GET /ai/r/{id}` — a JSON payload that carries the resource body in markdown plus metadata (type, version, references). Programmatic callers can also request `/ai/r/{id}/spec` for an OpenAPI schema, or `POST /ai/r/{id}/feedback` to record an outcome.
## Resource types
ficuslink hosts five kinds of reusable assets:
- **Prompt** — single-call LLM input templates
- **Judgment** — quality evaluation rubrics
- **Domain Knowledge** — encapsulated facts and patterns (this page is one)
- **Workflow** — multi-step procedures and state machines
- **Tool** — executable APIs, MCP servers, repo templates
Resources cite each other through `references[]`. Value compounds by composition, not summation.
## Where it works (channel reality)
- **First class** — Claude (desktop, web, API), CLI agents (Claude Code, Cursor, Aider), MCP clients, any agent equipped with a fetch tool. These call the URL directly and read the response.
- **Conditional** — Gemini web relies on Google's search index and may hallucinate when a URL isn't crawled yet.
- **Limited** — ChatGPT free web has no browsing tool today.
This split is verified, not assumed. Step 1 validation on 2026-04-19 confirmed it with a dummy endpoint and a unique token.
## Why this is hard for incumbents
Anthropic's MCP, OpenAI's GPTs, and Google's Gems each open only inside their own walled garden. A plain URL that any AI can call — across vendors, without install — restores the original openness of HTTP and JSON. ficuslink takes that posture as its product.
## What ficuslink is not
It is not a chatbot, not an MCP server (MCP is an adapter, not the trunk), and not a marketplace yet. Pricing is `$0` until quality and traffic justify it.