Reference

Bot developer reference: limits, rate limits, libraries and cheat sheets

Numbers you look up again and again, in one place. Every factual row links to the official documentation it came from, with the date it was last checked.

Data

Platform limits

Message length, embeds, blocks, buttons, commands, file sizes and response deadlines for eight platforms, each with a source link.

Data

API rate limits

Published sending and request limits per platform, with notes on bursts, buckets and how each API signals a 429.

Libraries

Frameworks and libraries

Maintained libraries for Telegram, Discord, Slack, Matrix, multi-platform and LLM bots, with language and license.

Telegram cheat sheet

Core methods, update types, formatting, keyboards, webhooks and the errors you will meet most often.

Discord

Discord cheat sheet

Gateway intents, interactions, response types, components, permissions and rate limit headers on one page.

Slack

Slack cheat sheet

Token types, Socket Mode versus HTTP, request signing, mrkdwn, common scopes and errors.

WhatsApp cheat sheet

Endpoints, webhook verification, message types, the 24 hour window, templates and status updates.

Code

Starter code templates

Minimal, working starting points with signature checks and clean shutdown. Copy or download each file.

How this data is maintained

Platforms change limits without much notice. Each table shows a "last checked" date and a source link per row; treat the official page as the authority and handle errors such as HTTP 429 or "message too long" in code rather than relying on hard-coded numbers alone.

Spotted something outdated? The changelog lists every update. Changelog