MAX_TWEET_LENGTH env implementation

Author: onur-saf

packages/client-twitter/src/environment.ts

@@ -1,6 +1,8 @@
 import { IAgentRuntime } from "@ai16z/eliza";
 import { z } from "zod";
 
+const DEFAULT_MAX_TWEET_LENGTH = 200;
+
 export const twitterEnvSchema = z.object({
     TWITTER_DRY_RUN: z
         .string()
@@ -9,6 +11,10 @@ export const twitterEnvSchema = z.object({
     TWITTER_PASSWORD: z.string().min(1, "Twitter password is required"),
     TWITTER_EMAIL: z.string().email("Valid Twitter email is required"),
     TWITTER_COOKIES: z.string().optional(),
+    MAX_TWEET_LENGTH: z
+        .string()
+        .pipe(z.coerce.number().min(0).int())
+        .default(DEFAULT_MAX_TWEET_LENGTH.toString()),
 });
 
 export type TwitterConfig = z.infer<typeof twitterEnvSchema>;
@@ -34,6 +40,10 @@ export async function validateTwitterConfig(
             TWITTER_COOKIES:
                 runtime.getSetting("TWITTER_COOKIES") ||
                 process.env.TWITTER_COOKIES,
+            MAX_TWEET_LENGTH:
+                runtime.getSetting("MAX_TWEET_LENGTH") ||
+                process.env.MAX_TWEET_LENGTH ||
+                DEFAULT_MAX_TWEET_LENGTH.toString(),
         };
 
         return twitterEnvSchema.parse(config);

packages/client-twitter/src/post.ts

@@ -30,20 +30,21 @@ const twitterPostTemplate = `
 Write a 1-3 sentence post that is {{adjective}} about {{topic}} (without mentioning {{topic}} directly), from the perspective of {{agentName}}. Do not add commentary or acknowledge this request, just write the post.
 Your response should not contain any questions. Brief, concise statements only. The total character count MUST be less than 280. No emojis. Use \\n\\n (double spaces) between statements.`;
 
-const MAX_TWEET_LENGTH = 280;
-
 /**
  * Truncate text to fit within the Twitter character limit, ensuring it ends at a complete sentence.
  */
-function truncateToCompleteSentence(text: string): string {
-    if (text.length <= MAX_TWEET_LENGTH) {
+function truncateToCompleteSentence(
+    text: string,
+    maxTweetLength: number
+): string {
+    if (text.length <= maxTweetLength) {
         return text;
     }
 
     // Attempt to truncate at the last period within the limit
     const truncatedAtPeriod = text.slice(
         0,
-        text.lastIndexOf(".", MAX_TWEET_LENGTH) + 1
+        text.lastIndexOf(".", maxTweetLength) + 1
     );
     if (truncatedAtPeriod.trim().length > 0) {
         return truncatedAtPeriod.trim();
@@ -52,14 +53,14 @@ function truncateToCompleteSentence(text: string): string {
     // If no period is found, truncate to the nearest whitespace
     const truncatedAtSpace = text.slice(
         0,
-        text.lastIndexOf(" ", MAX_TWEET_LENGTH)
+        text.lastIndexOf(" ", maxTweetLength)
     );
     if (truncatedAtSpace.trim().length > 0) {
         return truncatedAtSpace.trim() + "...";
     }
 
     // Fallback: Hard truncate and add ellipsis
-    return text.slice(0, MAX_TWEET_LENGTH - 3).trim() + "...";
+    return text.slice(0, maxTweetLength - 3).trim() + "...";
 }
 
 export class TwitterPostClient {
@@ -171,7 +172,10 @@ export class TwitterPostClient {
                 .trim();
 
             // Use the helper function to truncate to complete sentence
-            const content = truncateToCompleteSentence(formattedTweet);
+            const content = truncateToCompleteSentence(
+                formattedTweet,
+                Number(this.runtime.getSetting("MAX_TWEET_LENGTH"))
+            );
 
             if (this.runtime.getSetting("TWITTER_DRY_RUN") === "true") {
                 elizaLogger.info(