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sim/apps/docs/content/docs/en/tools/reddit.mdx
Waleed 2722f0efbf feat(reddit): add 5 new tools, fix bugs, and audit all endpoints against API docs (#3434) 
* feat(reddit): add 5 new tools, fix bugs, and audit all endpoints against API docs

* fix(reddit): add optional chaining, pagination wiring, and trim safety

- Add optional chaining on children?.[0] in get_posts, get_controversial,
  search, and get_comments to prevent TypeError on unexpected API responses
- Wire after/before pagination params to get_messages block operation
- Use ?? instead of || for get_comments limit to handle 0 correctly
- Add .trim() on postId in get_comments URL path

* chore(reddit): remove unused output property constants from types.ts

* fix(reddit): add HTTP error handling to GET tools

Add !response.ok guards to get_me, get_user, get_subreddit_info,
and get_messages to return success: false on non-2xx responses
instead of silently returning empty data with success: true.

* fix(reddit): add input validation and HTTP error guards

- Add validateEnum/validatePathSegment to prevent URL path traversal
- Add !response.ok guards to send_message and reply tools
- Centralize subreddit validation in normalizeSubreddit
2026-03-05 20:07:29 -08:00

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---
title: Reddit
description: Access Reddit data and content
---
import { BlockInfoCard } from "@/components/ui/block-info-card"
<BlockInfoCard
type="reddit"
color="#FF5700"
/>
{/* MANUAL-CONTENT-START:intro */}
[Reddit](https://www.reddit.com/) is a social platform where users share and discuss content in topic-based communities called subreddits.
In Sim, you can use the Reddit integration to:
- **Get Posts**: Retrieve posts from any subreddit, with options to sort (Hot, New, Top, Rising) and filter Top posts by time (Day, Week, Month, Year, All Time).
- **Get Comments**: Fetch comments from a specific post, with options to sort and set the number of comments.
These operations let your agents access and analyze Reddit content as part of your automated workflows.
{/* MANUAL-CONTENT-END */}
## Usage Instructions
Integrate Reddit into workflows. Read posts, comments, and search content. Submit posts, vote, reply, edit, manage messages, and access user and subreddit info.
## Tools
### `reddit_get_posts`
Fetch posts from a subreddit with different sorting options
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `subreddit` | string | Yes | The subreddit to fetch posts from \(e.g., "technology", "news"\) |
| `sort` | string | No | Sort method for posts \(e.g., "hot", "new", "top", "rising", "controversial"\). Default: "hot" |
| `limit` | number | No | Maximum number of posts to return \(e.g., 25\). Default: 10, max: 100 |
| `time` | string | No | Time filter for "top" sorted posts: "day", "week", "month", "year", or "all" \(default: "all"\) |
| `after` | string | No | Fullname of a thing to fetch items after \(for pagination\) |
| `before` | string | No | Fullname of a thing to fetch items before \(for pagination\) |
| `count` | number | No | A count of items already seen in the listing \(used for numbering\) |
| `show` | string | No | Show items that would normally be filtered \(e.g., "all"\) |
| `sr_detail` | boolean | No | Expand subreddit details in the response |
| `g` | string | No | Geo filter for posts \(e.g., "GLOBAL", "US", "AR", etc.\) |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `subreddit` | string | Name of the subreddit where posts were fetched from |
| `posts` | array | Array of posts with title, author, URL, score, comments count, and metadata |
| ↳ `id` | string | Post ID |
| ↳ `name` | string | Thing fullname \(t3_xxxxx\) |
| ↳ `title` | string | Post title |
| ↳ `author` | string | Author username |
| ↳ `url` | string | Post URL |
| ↳ `permalink` | string | Reddit permalink |
| ↳ `score` | number | Post score \(upvotes - downvotes\) |
| ↳ `num_comments` | number | Number of comments |
| ↳ `created_utc` | number | Creation timestamp \(UTC\) |
| ↳ `is_self` | boolean | Whether this is a text post |
| ↳ `selftext` | string | Text content for self posts |
| ↳ `thumbnail` | string | Thumbnail URL |
| ↳ `subreddit` | string | Subreddit name |
| `after` | string | Fullname of the last item for forward pagination |
| `before` | string | Fullname of the first item for backward pagination |
### `reddit_get_comments`
Fetch comments from a specific Reddit post
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `postId` | string | Yes | The ID of the Reddit post to fetch comments from \(e.g., "abc123"\) |
| `subreddit` | string | Yes | The subreddit where the post is located \(e.g., "technology", "programming"\) |
| `sort` | string | No | Sort method for comments: "confidence", "top", "new", "controversial", "old", "random", "qa" \(default: "confidence"\) |
| `limit` | number | No | Maximum number of comments to return \(e.g., 25\). Default: 50, max: 100 |
| `depth` | number | No | Maximum depth of subtrees in the thread \(controls nested comment levels\) |
| `context` | number | No | Number of parent comments to include |
| `showedits` | boolean | No | Show edit information for comments |
| `showmore` | boolean | No | Include "load more comments" elements in the response |
| `threaded` | boolean | No | Return comments in threaded/nested format |
| `truncate` | number | No | Integer to truncate comment depth |
| `comment` | string | No | ID36 of a comment to focus on \(returns that comment thread\) |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `post` | object | Post information including ID, title, author, content, and metadata |
| ↳ `id` | string | Post ID |
| ↳ `name` | string | Thing fullname \(t3_xxxxx\) |
| ↳ `title` | string | Post title |
| ↳ `author` | string | Post author |
| ↳ `selftext` | string | Post text content |
| ↳ `score` | number | Post score |
| ↳ `created_utc` | number | Creation timestamp |
| ↳ `permalink` | string | Reddit permalink |
| `comments` | array | Nested comments with author, body, score, timestamps, and replies |
| ↳ `id` | string | Comment ID |
| ↳ `name` | string | Thing fullname \(t1_xxxxx\) |
| ↳ `author` | string | Comment author |
| ↳ `body` | string | Comment text |
| ↳ `score` | number | Comment score |
| ↳ `created_utc` | number | Creation timestamp |
| ↳ `permalink` | string | Comment permalink |
| ↳ `replies` | array | Nested reply comments |
### `reddit_get_controversial`
Fetch controversial posts from a subreddit
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `subreddit` | string | Yes | The subreddit to fetch posts from \(e.g., "technology", "news"\) |
| `time` | string | No | Time filter for controversial posts: "hour", "day", "week", "month", "year", or "all" \(default: "all"\) |
| `limit` | number | No | Maximum number of posts to return \(e.g., 25\). Default: 10, max: 100 |
| `after` | string | No | Fullname of a thing to fetch items after \(for pagination\) |
| `before` | string | No | Fullname of a thing to fetch items before \(for pagination\) |
| `count` | number | No | A count of items already seen in the listing \(used for numbering\) |
| `show` | string | No | Show items that would normally be filtered \(e.g., "all"\) |
| `sr_detail` | boolean | No | Expand subreddit details in the response |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `subreddit` | string | Name of the subreddit where posts were fetched from |
| `posts` | array | Array of controversial posts with title, author, URL, score, comments count, and metadata |
| ↳ `id` | string | Post ID |
| ↳ `name` | string | Thing fullname \(t3_xxxxx\) |
| ↳ `title` | string | Post title |
| ↳ `author` | string | Author username |
| ↳ `url` | string | Post URL |
| ↳ `permalink` | string | Reddit permalink |
| ↳ `score` | number | Post score \(upvotes - downvotes\) |
| ↳ `num_comments` | number | Number of comments |
| ↳ `created_utc` | number | Creation timestamp \(UTC\) |
| ↳ `is_self` | boolean | Whether this is a text post |
| ↳ `selftext` | string | Text content for self posts |
| ↳ `thumbnail` | string | Thumbnail URL |
| ↳ `subreddit` | string | Subreddit name |
| `after` | string | Fullname of the last item for forward pagination |
| `before` | string | Fullname of the first item for backward pagination |
### `reddit_search`
Search for posts within a subreddit
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `subreddit` | string | Yes | The subreddit to search in \(e.g., "technology", "programming"\) |
| `query` | string | Yes | Search query text \(e.g., "artificial intelligence", "machine learning tutorial"\) |
| `sort` | string | No | Sort method for search results \(e.g., "relevance", "hot", "top", "new", "comments"\). Default: "relevance" |
| `time` | string | No | Time filter for search results: "hour", "day", "week", "month", "year", or "all" \(default: "all"\) |
| `limit` | number | No | Maximum number of posts to return \(e.g., 25\). Default: 10, max: 100 |
| `restrict_sr` | boolean | No | Restrict search to the specified subreddit only \(default: true\) |
| `after` | string | No | Fullname of a thing to fetch items after \(for pagination\) |
| `before` | string | No | Fullname of a thing to fetch items before \(for pagination\) |
| `count` | number | No | A count of items already seen in the listing \(used for numbering\) |
| `show` | string | No | Show items that would normally be filtered \(e.g., "all"\) |
| `type` | string | No | Type of search results: "link" \(posts\), "sr" \(subreddits\), or "user" \(users\). Default: "link" |
| `sr_detail` | boolean | No | Expand subreddit details in the response |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `subreddit` | string | Name of the subreddit where search was performed |
| `posts` | array | Array of search result posts with title, author, URL, score, comments count, and metadata |
| ↳ `id` | string | Post ID |
| ↳ `name` | string | Thing fullname \(t3_xxxxx\) |
| ↳ `title` | string | Post title |
| ↳ `author` | string | Author username |
| ↳ `url` | string | Post URL |
| ↳ `permalink` | string | Reddit permalink |
| ↳ `score` | number | Post score \(upvotes - downvotes\) |
| ↳ `num_comments` | number | Number of comments |
| ↳ `created_utc` | number | Creation timestamp \(UTC\) |
| ↳ `is_self` | boolean | Whether this is a text post |
| ↳ `selftext` | string | Text content for self posts |
| ↳ `thumbnail` | string | Thumbnail URL |
| ↳ `subreddit` | string | Subreddit name |
| `after` | string | Fullname of the last item for forward pagination |
| `before` | string | Fullname of the first item for backward pagination |
### `reddit_submit_post`
Submit a new post to a subreddit (text or link)
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `subreddit` | string | Yes | The subreddit to post to \(e.g., "technology", "programming"\) |
| `title` | string | Yes | Title of the submission \(e.g., "Check out this new AI tool"\). Max 300 characters |
| `text` | string | No | Text content for a self post in markdown format \(e.g., "This is the **body** of my post"\) |
| `url` | string | No | URL for a link post \(cannot be used with text\) |
| `nsfw` | boolean | No | Mark post as NSFW |
| `spoiler` | boolean | No | Mark post as spoiler |
| `send_replies` | boolean | No | Send reply notifications to inbox \(default: true\) |
| `flair_id` | string | No | Flair template UUID for the post \(max 36 characters\) |
| `flair_text` | string | No | Flair text to display on the post \(max 64 characters\) |
| `collection_id` | string | No | Collection UUID to add the post to |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `success` | boolean | Whether the post was submitted successfully |
| `message` | string | Success or error message |
| `data` | object | Post data including ID, name, URL, and permalink |
| ↳ `id` | string | New post ID |
| ↳ `name` | string | Thing fullname \(t3_xxxxx\) |
| ↳ `url` | string | Post URL from API response |
| ↳ `permalink` | string | Full Reddit permalink |
### `reddit_vote`
Upvote, downvote, or unvote a Reddit post or comment
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `id` | string | Yes | Thing fullname to vote on \(e.g., "t3_abc123" for post, "t1_def456" for comment\) |
| `dir` | number | Yes | Vote direction: 1 \(upvote\), 0 \(unvote\), or -1 \(downvote\) |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `success` | boolean | Whether the vote was successful |
| `message` | string | Success or error message |
### `reddit_save`
Save a Reddit post or comment to your saved items
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `id` | string | Yes | Thing fullname to save \(e.g., "t3_abc123" for post, "t1_def456" for comment\) |
| `category` | string | No | Category to save under \(Reddit Gold feature\) |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `success` | boolean | Whether the save was successful |
| `message` | string | Success or error message |
### `reddit_unsave`
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `subreddit` | string | Subreddit name |
| `posts` | json | Posts data |
| `post` | json | Single post data |
| `comments` | json | Comments data |
| `success` | boolean | Operation success status |
| `message` | string | Result message |
| `data` | json | Response data |
| `after` | string | Pagination cursor \(next page\) |
| `before` | string | Pagination cursor \(previous page\) |
| `id` | string | Entity ID |
| `name` | string | Entity fullname |
| `messages` | json | Messages data |
| `display_name` | string | Subreddit display name |
| `subscribers` | number | Subscriber count |
| `description` | string | Description text |
| `link_karma` | number | Link karma |
| `comment_karma` | number | Comment karma |
| `total_karma` | number | Total karma |
| `icon_img` | string | Icon image URL |
### `reddit_reply`
Add a comment reply to a Reddit post or comment
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `parent_id` | string | Yes | Thing fullname to reply to \(e.g., "t3_abc123" for post, "t1_def456" for comment\) |
| `text` | string | Yes | Comment text in markdown format \(e.g., "Great post! Here is my **reply**"\) |
| `return_rtjson` | boolean | No | Return response in Rich Text JSON format |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `success` | boolean | Whether the reply was posted successfully |
| `message` | string | Success or error message |
| `data` | object | Comment data including ID, name, permalink, and body |
| ↳ `id` | string | New comment ID |
| ↳ `name` | string | Thing fullname \(t1_xxxxx\) |
| ↳ `permalink` | string | Comment permalink |
| ↳ `body` | string | Comment body text |
### `reddit_edit`
Edit the text of your own Reddit post or comment
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `thing_id` | string | Yes | Thing fullname to edit \(e.g., "t3_abc123" for post, "t1_def456" for comment\) |
| `text` | string | Yes | New text content in markdown format \(e.g., "Updated **content** here"\) |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `success` | boolean | Whether the edit was successful |
| `message` | string | Success or error message |
| `data` | object | Updated content data |
| ↳ `id` | string | Edited thing ID |
| ↳ `body` | string | Updated comment body \(for comments\) |
| ↳ `selftext` | string | Updated post text \(for self posts\) |
### `reddit_delete`
Delete your own Reddit post or comment
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `id` | string | Yes | Thing fullname to delete \(e.g., "t3_abc123" for post, "t1_def456" for comment\) |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `success` | boolean | Whether the deletion was successful |
| `message` | string | Success or error message |
### `reddit_subscribe`
Subscribe or unsubscribe from a subreddit
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `subreddit` | string | Yes | The subreddit to subscribe to or unsubscribe from \(e.g., "technology", "programming"\) |
| `action` | string | Yes | Action to perform: "sub" to subscribe or "unsub" to unsubscribe |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `success` | boolean | Whether the subscription action was successful |
| `message` | string | Success or error message |
### `reddit_get_me`
Get information about the authenticated Reddit user
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `id` | string | User ID |
| `name` | string | Username |
| `created_utc` | number | Account creation time in UTC epoch seconds |
| `link_karma` | number | Total link karma |
| `comment_karma` | number | Total comment karma |
| `total_karma` | number | Combined total karma |
| `is_gold` | boolean | Whether user has Reddit Premium |
| `is_mod` | boolean | Whether user is a moderator |
| `has_verified_email` | boolean | Whether email is verified |
| `icon_img` | string | User avatar/icon URL |
### `reddit_get_user`
Get public profile information about any Reddit user by username
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `username` | string | Yes | Reddit username to look up \(e.g., "spez", "example_user"\) |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `id` | string | User ID |
| `name` | string | Username |
| `created_utc` | number | Account creation time in UTC epoch seconds |
| `link_karma` | number | Total link karma |
| `comment_karma` | number | Total comment karma |
| `total_karma` | number | Combined total karma |
| `is_gold` | boolean | Whether user has Reddit Premium |
| `is_mod` | boolean | Whether user is a moderator |
| `has_verified_email` | boolean | Whether email is verified |
| `icon_img` | string | User avatar/icon URL |
### `reddit_send_message`
Send a private message to a Reddit user
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `to` | string | Yes | Recipient username \(e.g., "example_user"\) or subreddit \(e.g., "/r/subreddit"\) |
| `subject` | string | Yes | Message subject \(max 100 characters\) |
| `text` | string | Yes | Message body in markdown format |
| `from_sr` | string | No | Subreddit name to send the message from \(requires moderator mail permission\) |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `success` | boolean | Whether the message was sent successfully |
| `message` | string | Success or error message |
### `reddit_get_messages`
Retrieve private messages from your Reddit inbox
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `where` | string | No | Message folder to retrieve: "inbox" \(all\), "unread", "sent", "messages" \(direct messages only\), "comments" \(comment replies\), "selfreply" \(self-post replies\), or "mentions" \(username mentions\). Default: "inbox" |
| `limit` | number | No | Maximum number of messages to return \(e.g., 25\). Default: 25, max: 100 |
| `after` | string | No | Fullname of a thing to fetch items after \(for pagination\) |
| `before` | string | No | Fullname of a thing to fetch items before \(for pagination\) |
| `mark` | boolean | No | Whether to mark fetched messages as read |
| `count` | number | No | A count of items already seen in the listing \(used for numbering\) |
| `show` | string | No | Show items that would normally be filtered \(e.g., "all"\) |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `messages` | array | Array of messages with sender, recipient, subject, body, and metadata |
| ↳ `id` | string | Message ID |
| ↳ `name` | string | Thing fullname \(t4_xxxxx\) |
| ↳ `author` | string | Sender username |
| ↳ `dest` | string | Recipient username |
| ↳ `subject` | string | Message subject |
| ↳ `body` | string | Message body text |
| ↳ `created_utc` | number | Creation time in UTC epoch seconds |
| ↳ `new` | boolean | Whether the message is unread |
| ↳ `was_comment` | boolean | Whether the message is a comment reply |
| ↳ `context` | string | Context URL for comment replies |
| ↳ `distinguished` | string | Distinction: null/"moderator"/"admin" |
| `after` | string | Fullname of the last item for forward pagination |
| `before` | string | Fullname of the first item for backward pagination |
### `reddit_get_subreddit_info`
Get metadata and information about a subreddit
#### Input
| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `subreddit` | string | Yes | The subreddit to get info about \(e.g., "technology", "programming", "news"\) |
#### Output
| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `id` | string | Subreddit ID |
| `name` | string | Subreddit fullname \(t5_xxxxx\) |
| `display_name` | string | Subreddit name without prefix |
| `title` | string | Subreddit title |
| `description` | string | Full subreddit description \(markdown\) |
| `public_description` | string | Short public description |
| `subscribers` | number | Number of subscribers |
| `accounts_active` | number | Number of currently active users |
| `created_utc` | number | Creation time in UTC epoch seconds |
| `over18` | boolean | Whether the subreddit is NSFW |
| `lang` | string | Primary language of the subreddit |
| `subreddit_type` | string | Subreddit type: public, private, restricted, etc. |
| `url` | string | Subreddit URL path \(e.g., /r/technology/\) |
| `icon_img` | string | Subreddit icon URL |
| `banner_img` | string | Subreddit banner URL |
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