refactor: share reply prefix context

src/channels/reply-prefix.ts

@@ -0,0 +1,41 @@
+import { resolveEffectiveMessagesConfig, resolveIdentityName } from "../agents/identity.js";
+import type { ClawdbotConfig } from "../config/config.js";
+import type { GetReplyOptions } from "../auto-reply/types.js";
+import {
+  extractShortModelName,
+  type ResponsePrefixContext,
+} from "../auto-reply/reply/response-prefix-template.js";
+
+type ModelSelectionContext = Parameters<NonNullable<GetReplyOptions["onModelSelected"]>>[0];
+
+export type ReplyPrefixContextBundle = {
+  prefixContext: ResponsePrefixContext;
+  responsePrefix?: string;
+  responsePrefixContextProvider: () => ResponsePrefixContext;
+  onModelSelected: (ctx: ModelSelectionContext) => void;
+};
+
+export function createReplyPrefixContext(params: {
+  cfg: ClawdbotConfig;
+  agentId: string;
+}): ReplyPrefixContextBundle {
+  const { cfg, agentId } = params;
+  const prefixContext: ResponsePrefixContext = {
+    identityName: resolveIdentityName(cfg, agentId),
+  };
+
+  const onModelSelected = (ctx: ModelSelectionContext) => {
+    // Mutate the object directly instead of reassigning to ensure closures see updates.
+    prefixContext.provider = ctx.provider;
+    prefixContext.model = extractShortModelName(ctx.model);
+    prefixContext.modelFull = `${ctx.provider}/${ctx.model}`;
+    prefixContext.thinkingLevel = ctx.thinkLevel ?? "off";
+  };
+
+  return {
+    prefixContext,
+    responsePrefix: resolveEffectiveMessagesConfig(cfg, agentId).responsePrefix,
+    responsePrefixContextProvider: () => prefixContext,
+    onModelSelected,
+  };
+}