discord

A tool for sending and managing messages on Discord, a chat platform organized around servers and channels. It supports actions such as sending, replying, editing, deleting, reacting, and sending attachments.

In plain words
What is it for?
Use it to message channels or users, reply to specific messages, add reactions, edit or delete messages, and send files.
Why use it?
It lets an agent carry out Discord communication through one defined messaging interface.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/understudy-ai/understudy/discord
Any agent
npx skills add understudy-ai/understudy --skill discord
Clone the repo
git clone --depth 1 https://github.com/understudy-ai/understudy

Made for: Claude Code, Codex.

Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 677 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00033 $0.00677
Opus 5 $0.00016 $0.00338
Sonnet 5 $0.00007 $0.00135
Haiku 4.5 $0.00003 $0.00068

Measured 2d ago against content hash b597cb3b984a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

discord scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/discord/SKILL.md · 104 lines

How it starts

The opening of the file, as written. The whole thing — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Discord (Via message_send)

Use the message_send tool. Understudy does not expose a separate provider-specific discord tool.

Musts

  • Always: channel: "discord".
  • Use the canonical message_send schema: recipient, text, threadId, replyTo, messageId, emoji, attachmentUrl, attachmentType, attachmentName, attachmentMimeType.
  • Prefer explicit ids in the recipient string when possible, for example channel:1234567890 or user:1234567890.

Guidelines

  • Avoid Markdown tables in outbound Discord messages.
  • Mention users as <@USER_ID>.
  • Keep Discord actions within the current Understudy tool surface. Do not invent unsupported fields such as components, embeds, pollQuestion, thread-create, search, or set-presence.

Targets

  • Send-like actions: recipient: "channel:<id>" or recipient: "user:<id>".
  • Message-specific actions: use messageId, and include recipient when the adapter needs target context.

Common Actions (Examples)

Send message:

{
  "action": "send",
  "channel": "discord",
  "recipient": "channel:123",
  "text": "hello"
}

Reply to a message:

{
  "action": "reply",
  "channel": "discord",
  "recipient": "channel:123",
  "replyTo": "456",
  "text": "Thanks, looking now."
}

Send with attachment:

{
  "action": "sendAttachment",
  "channel": "discord",
  "recipient": "channel:123",
  "text": "see attachment",
  "attachmentUrl": "/tmp/example.png",
  "attachmentType": "image",
  "attachmentName": "example.png"
}
{
  "action": "edit",
  "channel": "discord",
  "recipient": "channel:123",
  "messageId": "456",
  "text": "fixed typo"
}
{
  "action": "react",
  "channel": "discord",
  "recipient": "channel:123",
  "messageId": "456",
  "emoji": "✅"
}
{
  "action": "delete",
  "channel": "discord",
  "recipient": "channel:123",
  "messageId": "456"
}

If you need polls, search, thread creation, pins, moderation, or presence changes, tell the user the current Understudy tool surface does not expose those Discord-specific operations directly.

Read the full file on GitHub · 104 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 104 lines · 33 tokens per session scan A b597cb3b984a

Subscribe to this mod's changes

discord is a skill published in the GitHub repository understudy-ai/understudy (456 stars, last pushed 2mo ago), licensed MIT. It adds 33 tokens to every session and 677 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.