Add docs for coding agents (#55)

* add docs for coding agents

* Update common/js/AGENTS.md

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: rblalock

common/js/AGENTS.md

@@ -16,8 +16,12 @@ This guide provides comprehensive instructions for developing AI agents using th
 ```typescript
 import type { AgentRequest, AgentResponse, AgentContext } from "@agentuity/sdk";
 
-export default async function Agent(req: AgentRequest, resp: AgentResponse, ctx: AgentContext) {
-	return resp.json({hello: 'world'});
+export default async function Agent(
+  req: AgentRequest,
+  resp: AgentResponse,
+  ctx: AgentContext,
+) {
+  return resp.json({ hello: "world" });
 }
 ```
 
@@ -31,7 +35,7 @@ The main handler function type for an agent:
 type AgentHandler = (
   request: AgentRequest,
   response: AgentResponse,
-  context: AgentContext
+  context: AgentContext,
 ) => Promise<AgentResponseType>;
 ```
 
@@ -107,4 +111,152 @@ Access through `context.logger`:
 - Use the storage APIs for persisting data
 - Consider agent communication for complex workflows
 
-For complete documentation, visit: https://agentuity.dev/SDKs/javascript/api-reference
+## 6. How to use the documentation site, its APIs, etc.
+
+The Agentuity documentation site provides API endpoints that AI agents can use to search and read documentation programmatically.
+
+For the complete docs: https://agentuity.dev
+The public repo markdown files are here: https://github.com/agentuity/docs/tree/main/content
+For complete JS SDK documentation, visit: https://agentuity.dev/SDKs/javascript/api-reference
+
+With that in mind, here are some helpful things you can do to find the right doc information:
+
+**Base URL:** `https://agentuity.dev`
+
+### Quick Reference
+
+```bash
+# Set base URL once per session
+BASE="https://agentuity.dev"
+
+# Ask a question (AI-powered with RAG)
+curl -sG "$BASE/api/rag-search" --data-urlencode "query=How do I create an agent?"
+
+# Search documentation (keyword search)
+curl -sG "$BASE/api/search" --data-urlencode "query=environment variables"
+
+# Read full page content
+curl -sG "$BASE/api/page-content" --data-urlencode "path=Introduction/getting-started"
+```
+
+### API Endpoints
+
+#### 1. RAG Search (Recommended for Questions)
+
+**Use when:** You have a natural-language question and want an AI-generated answer with supporting documentation.
+
+```bash
+curl -sG "https://agentuity.dev/api/rag-search" \
+  --data-urlencode "query=How do I use KV?"
+```
+
+**Response Format:**
+
+```json
+[
+  {
+    "id": "ai-answer-...",
+    "url": "#ai-answer",
+    "title": "AI Answer",
+    "content": "AI-generated answer to your question...",
+    "type": "ai-answer"
+  },
+  {
+    "id": "doc-...",
+    "url": "/getting-started/installation",
+    "title": "Installation Guide",
+    "content": "Brief snippet of the document...",
+    "type": "document"
+  }
+]
+```
+
+**Workflow:**
+
+1. Get the `ai-answer` item for a quick response
+2. Extract `document` items for supporting documentation
+3. Use the `url` field to read full page content (see Page Content API)
+
+#### 2. Keyword Search (Deterministic)
+
+**Use when:** You need exact keyword matches or when RAG is unavailable.
+
+```bash
+curl -sG "https://agentuity.dev/api/search" \
+  --data-urlencode "query=agent create"
+```
+
+**Response Format:**
+
+```json
+[
+  {
+    "id": "/guide/agents",
+    "type": "page",
+    "content": "Creating Agents",
+    "url": "/guide/agents"
+  },
+  {
+    "id": "/guide/agents-12",
+    "type": "text",
+    "content": "Use the CLI to create a new agent...",
+    "url": "/guide/agents#create"
+  }
+]
+```
+
+#### 3. Page Content (Full Markdown)
+
+**Use when:** You need the complete markdown content of a specific documentation page.
+
+```bash
+curl -sG "https://agentuity.dev/api/page-content" \
+  --data-urlencode "path=getting-started/quickstart"
+```
+
+**Path Format:**
+
+- Remove leading slash: `/getting-started/quickstart` → `getting-started/quickstart`
+- Remove trailing slashes
+- Remove URL fragments: `guide/install#linux` → `guide/install`
+- For index pages, use just the folder name: `getting-started` resolves to `getting-started/index.mdx`
+
+**Convert URL to Path (one-liner):**
+
+```bash
+PATH="$(echo "$URL" | sed -E 's#^/##; s#/+$##; s/#.*$//')"
+```
+
+**Response Format:**
+
+```json
+{
+  "content": "# Quickstart\n\nFull markdown content here...",
+  "title": "Quickstart Guide",
+  "description": "Get started quickly with Agentuity",
+  "path": "getting-started/quickstart"
+}
+```
+
+**Path Validation:**
+
+- Paths cannot contain `..`, `\`, or start with `/`
+- Returns 404 if page not found
+
+### When to Use Which API
+
+| Scenario                | Recommended API                            | Reason                                |
+| ----------------------- | ------------------------------------------ | ------------------------------------- |
+| "How do I..." questions | `/api/rag-search`                          | AI-generated answer + supporting docs |
+| Exact term search       | `/api/search`                              | Fast, deterministic keyword matching  |
+| Reading specific page   | `/api/page-content`                        | Full markdown with proper formatting  |
+| Error message lookup    | `/api/search`                              | Exact text matching                   |
+| Multi-step tutorials    | `/api/rag-search` then `/api/page-content` | Get overview, then deep dive          |
+
+### Best Practices
+
+1. **Start with RAG for questions:** It provides both answers and relevant documentation links
+2. **Use keyword search for known terms:** When you know exactly what you're looking for
+3. **Fetch full content for citations:** Always read the complete page when citing documentation
+4. **Cache results:** Avoid repeated API calls for the same content
+5. **Handle fallbacks:** If RAG fails, fall back to keyword search