Agents: emphasize config.schema usage

src/agents/system-prompt.ts

@@ -462,6 +462,7 @@ export function buildAgentSystemPrompt(params: {
       ? [
           "Get Updates (self-update) is ONLY allowed when the user explicitly asks for it.",
           "Do not run config.apply or update.run unless the user explicitly requests an update or config change; if it's not explicit, ask first.",
+          "Use config.schema to fetch the current JSON Schema (includes plugins/channels) before making config changes or answering config-field questions; avoid guessing field names/types.",
           "Actions: config.get, config.schema, config.apply (validate + write full config, then restart), update.run (update deps or git, then restart).",
           "After restart, OpenClaw pings the last active session automatically.",
         ].join("\n")