docs(tools): document agent tool allow/deny

docs/tools.md

@@ -11,6 +11,21 @@ Clawdbot exposes **first-class agent tools** for browser, canvas, nodes, and cro
 These replace the old `clawdbot-*` skills: the tools are typed, no shelling,
 and the agent should rely on them directly.
 
+## Disabling tools
+
+You can globally allow/deny tools via `agent.tools` in `clawdbot.json`
+(deny wins). This prevents disallowed tools from being sent to providers.
+
+```json5
+{
+  agent: {
+    tools: {
+      deny: ["browser"]
+    }
+  }
+}
+```
+
 ## Tool inventory
 
 ### `bash`