refactor: split web tools and docs

docs/perplexity.md

@@ -0,0 +1,76 @@
+---
+summary: "Perplexity Sonar setup for web_search"
+read_when:
+  - You want to use Perplexity Sonar for web search
+  - You need PERPLEXITY_API_KEY or OpenRouter setup
+---
+
+# Perplexity Sonar
+
+Clawdbot can use Perplexity Sonar for the `web_search` tool. You can connect
+through Perplexity’s direct API or via OpenRouter.
+
+## API options
+
+### Perplexity (direct)
+
+- Base URL: https://api.perplexity.ai
+- Environment variable: `PERPLEXITY_API_KEY`
+
+### OpenRouter (alternative)
+
+- Base URL: https://openrouter.ai/api/v1
+- Environment variable: `OPENROUTER_API_KEY`
+- Supports prepaid/crypto credits.
+
+## Config example
+
+```json5
+{
+  tools: {
+    web: {
+      search: {
+        provider: "perplexity",
+        perplexity: {
+          apiKey: "pplx-...",
+          baseUrl: "https://api.perplexity.ai",
+          model: "perplexity/sonar-pro"
+        }
+      }
+    }
+  }
+}
+```
+
+## Switching from Brave
+
+```json5
+{
+  tools: {
+    web: {
+      search: {
+        provider: "perplexity",
+        perplexity: {
+          apiKey: "pplx-...",
+          baseUrl: "https://api.perplexity.ai"
+        }
+      }
+    }
+  }
+}
+```
+
+If both `PERPLEXITY_API_KEY` and `OPENROUTER_API_KEY` are set, set
+`tools.web.search.perplexity.baseUrl` (or `tools.web.search.perplexity.apiKey`)
+to disambiguate.
+
+If `PERPLEXITY_API_KEY` is used from the environment and no base URL is set,
+Clawdbot defaults to the direct Perplexity endpoint. Set `baseUrl` to override.
+
+## Models
+
+- `perplexity/sonar` — fast Q&A with web search
+- `perplexity/sonar-pro` (default) — multi-step reasoning + web search
+- `perplexity/sonar-reasoning-pro` — deep research
+
+See [Web tools](/tools/web) for the full web_search configuration.