feat: add agent tools and sanitize tool names for Anthropic API

Add 8 new agent-callable tools (sessions.list/history/create/delete,
agents.list, message.send, cron.list/trigger) and sanitize tool names
at the API boundary (dots → underscores) to comply with Anthropic's
`^[a-zA-Z0-9_-]{1,128}` requirement. Reverse-maps sanitized names
back to internal names for hook callbacks and tool execution.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/tools/registry.ts

@@ -20,6 +20,11 @@ export class ToolRegistry {
   private tools: Map<string, Tool> = new Map();
   private _policy?: ToolPolicy;
 
+  /** Sanitize a tool name for API compatibility (dots → underscores). */
+  static sanitizeToolName(name: string): string {
+    return name.replace(/\./g, '_');
+  }
+
   register(tool: Tool): void {
     if (this.tools.has(tool.name)) {
       throw new Error(`Tool '${tool.name}' is already registered`);
@@ -55,6 +60,11 @@ export class ToolRegistry {
     return this.tools.get(name);
   }
 
+  /** Resolve a tool by its API-sanitized name (underscores → dots fallback). */
+  getByApiName(name: string): Tool | undefined {
+    return this.tools.get(name) ?? this.tools.get(name.replace(/_/g, '.'));
+  }
+
   list(): Tool[] {
     return Array.from(this.tools.values());
   }
@@ -77,7 +87,7 @@ export class ToolRegistry {
 
   toAnthropicFormat(): AnthropicToolDef[] {
     return this.list().map(t => ({
-      name: t.name,
+      name: ToolRegistry.sanitizeToolName(t.name),
       description: t.description,
       input_schema: t.inputSchema,
     }));
@@ -86,7 +96,7 @@ export class ToolRegistry {
   /** Return Anthropic-format tools filtered by policy. */
   filteredToAnthropicFormat(context?: ToolPolicyContext): AnthropicToolDef[] {
     return this.filteredList(context).map(t => ({
-      name: t.name,
+      name: ToolRegistry.sanitizeToolName(t.name),
       description: t.description,
       input_schema: t.inputSchema,
     }));
@@ -96,7 +106,7 @@ export class ToolRegistry {
     return this.list().map(t => ({
       type: 'function' as const,
       function: {
-        name: t.name,
+        name: ToolRegistry.sanitizeToolName(t.name),
         description: t.description,
         parameters: t.inputSchema,
       },
@@ -108,7 +118,7 @@ export class ToolRegistry {
     return this.filteredList(context).map(t => ({
       type: 'function' as const,
       function: {
-        name: t.name,
+        name: ToolRegistry.sanitizeToolName(t.name),
         description: t.description,
         parameters: t.inputSchema,
       },