refactor(messages): centralize per-agent prefixes

src/agents/identity.ts

@@ -29,6 +29,22 @@ export function resolveIdentityNamePrefix(
   return `[${name}]`;
 }
 
+export function resolveMessagePrefix(
+  cfg: ClawdbotConfig,
+  agentId: string,
+  opts?: { hasAllowFrom?: boolean; fallback?: string },
+): string {
+  const configured = cfg.messages?.messagePrefix;
+  if (configured !== undefined) return configured;
+
+  const hasAllowFrom = opts?.hasAllowFrom === true;
+  if (hasAllowFrom) return "";
+
+  return (
+    resolveIdentityNamePrefix(cfg, agentId) ?? opts?.fallback ?? "[clawdbot]"
+  );
+}
+
 export function resolveResponsePrefix(
   cfg: ClawdbotConfig,
   agentId: string,
@@ -37,3 +53,17 @@ export function resolveResponsePrefix(
   if (configured !== undefined) return configured;
   return resolveIdentityNamePrefix(cfg, agentId);
 }
+
+export function resolveEffectiveMessagesConfig(
+  cfg: ClawdbotConfig,
+  agentId: string,
+  opts?: { hasAllowFrom?: boolean; fallbackMessagePrefix?: string },
+): { messagePrefix: string; responsePrefix?: string } {
+  return {
+    messagePrefix: resolveMessagePrefix(cfg, agentId, {
+      hasAllowFrom: opts?.hasAllowFrom,
+      fallback: opts?.fallbackMessagePrefix,
+    }),
+    responsePrefix: resolveResponsePrefix(cfg, agentId),
+  };
+}