diff --git a/src/human-feedback/cli.ts b/src/human-feedback/cli.ts
index d67a5f7..134766b 100644
--- a/src/human-feedback/cli.ts
+++ b/src/human-feedback/cli.ts
@@ -52,7 +52,7 @@ export class HumanFeedbackMechanismCLI<
     }
 
     const choices = response.map((option) => ({
-      name: String(option),
+      name: JSON.stringify(option),
       value: option
     }))
     return select({ message: 'Pick one output:', choices })
@@ -66,7 +66,7 @@ export class HumanFeedbackMechanismCLI<
     }
 
     const choices = response.map((option) => ({
-      name: String(option),
+      name: JSON.stringify(option),
       value: option
     }))
     return checkbox({ message: 'Select outputs:', choices }) as any
diff --git a/src/human-feedback/slack.ts b/src/human-feedback/slack.ts
index 25b7f9a..81b7d75 100644
--- a/src/human-feedback/slack.ts
+++ b/src/human-feedback/slack.ts
@@ -82,7 +82,9 @@ export class HumanFeedbackMechanismSlack<
       await this._slackClient.sendAndWaitForReply({
         text:
           'Pick one output:' +
-          response.map((r, idx) => `\n*${idx}* - ${r}`).join('') +
+          response
+            .map((r, idx) => `\n*${idx}* - ${JSON.stringify(r)}`)
+            .join('') +
           '\n\nReply with the number of your choice.',
         validate: (slackMessage) => {
           const choice = parseInt(slackMessage.text)
@@ -103,7 +105,9 @@ export class HumanFeedbackMechanismSlack<
       await this._slackClient.sendAndWaitForReply({
         text:
           'Select outputs:' +
-          response.map((r, idx) => `\n*${idx}* - ${r}`).join('') +
+          response
+            .map((r, idx) => `\n*${idx}* - ${JSON.stringify(r)}`)
+            .join('') +
           '\n\nReply with a comma-separated list of the output numbers of your choice.',
         validate: (slackMessage) => {
           const choices = slackMessage.text.split(',')
diff --git a/src/human-feedback/twilio.ts b/src/human-feedback/twilio.ts
index 72f8386..401ec8a 100644
--- a/src/human-feedback/twilio.ts
+++ b/src/human-feedback/twilio.ts
@@ -86,7 +86,7 @@ export class HumanFeedbackMechanismTwilio<
         name: 'human-feedback-select',
         text:
           'Pick one output:' +
-          response.map((r, idx) => `\n${idx} - ${r}`).join('') +
+          response.map((r, idx) => `\n${idx} - ${JSON.stringify(r)}`).join('') +
           '\n\nReply with the number of your choice.',
         validate: (message) => {
           const choice = parseInt(message.body)
@@ -108,7 +108,7 @@ export class HumanFeedbackMechanismTwilio<
         name: 'human-feedback-select',
         text:
           'Select outputs:' +
-          response.map((r, idx) => `\n${idx} - ${r}`).join('') +
+          response.map((r, idx) => `\n${idx} - ${JSON.stringify(r)}`).join('') +
           '\n\nReply with a comma-separated list of the output numbers of your choice.',
         validate: (message) => {
           const choices = message.body.split(',')