Bug Description

With 80+ default skills organized into 19 categories, the /skill slash command group serializes to ~14,207 bytes — nearly double Discord's ~8,000 byte per-command payload limit. When tree.sync() submits this oversized payload, Discord returns:

400 Bad Request (error code: 50035): Invalid Form Body — Command exceeds maximum size (8000)

This rejects the entire batch of slash commands, including the 27 base commands (/model, /background, /new, etc.). As a result, users see zero slash commands in Discord after starting the gateway.

Root Cause

_register_skill_group() in gateway/platforms/discord.py registers all skills as a single nested /skill command with category subcommand groups. The serialized JSON payload (names + descriptions for ~80 subcommands) exceeds Discord's per-command size limit.

The payload breakdown:

• Total /skill group: ~14,207 bytes (77% over 8KB limit)
• Largest single category: /skill mlops at 3,549 bytes
• All individual categories fit easily under 8KB

Environment

• Hermes Agent version: latest main (post commit 10494b42)
• Skills installed: default 80+ skills (19 categories)
• Discord library: discord.py 2.x

Impact

• Severity: High — blocks ALL slash command functionality on the Discord platform
• Scope: Universal — affects every installation with the default skill set
• Workaround: None — removing skills is the only way to fit under the limit

Suggested Fix

Split the /skill group into multiple per-category top-level groups when the payload would exceed 8KB:

• Small skill sets → original /skill group (backward compatible)
• Large skill sets → /skill-mlops, /skill-creative, /skill-github, etc.

I've implemented this in PR #10261.