The unified-channel MCP server presents a foundational messaging abstraction across 18 channels with 6 tools. However, definition quality is hindered by missing parameter descriptions, incomplete output schemas, and vague tool names that don't clearly distinguish similar operations. While all tools have some description text and basic input schemas are present, parameter-level documentation is sparse, and output structures are not formally documented. The tool naming follows the verb pattern (send_, broadcast_, get_, list_, load_) correctly, but composite operations like broadcast_message combine multiple responsibilities into one tool. Descriptions are present but generic, they state WHAT the tool does but lack clarity on WHEN to use it versus alternatives, and several parameters lack description text entirely. No tool descriptions explain error conditions, prerequisites, or idempotent/destructive behavior, which is critical for agent safety.

• Document explicit output schemas for all tools. For get_channel_status, define the return structure (e.g. {channel: string, connected: boolean, lastUpdate: string}[]). For list_channels, return [{name: string, supported: boolean, connected: boolean}]. Without schemas, LLMs cannot extract the data they need.
• Add parameter descriptions for all parameters. 'limit' in get_recent_messages should be: 'Maximum number of messages to return. Range: 1-100, default: 20.' For 'channel' in send_message, state: 'Channel type as string enum. Supported values: telegram, discord, slack, mattermost, irc, whatsapp, line, feishu, msteams, googlechat, synology, zalo, nostr, twitch, bluebubbles, nextcloud, imessage, matrix.'
• Expand tool descriptions to 150-250 characters including WHEN and WHY. Example for send_message: 'Send a text message to a user/room on a connected channel. Use this for single-channel notifications. For multi-channel broadcasts, call this tool multiple times or use broadcast_message if all targets receive identical content.'
• Add error handling guidance to descriptions of write tools. Example: 'If the channel is offline, returns error with retry guidance. If the message is too long, returns InvalidMessageLength. All failures are idempotent, retrying with the same parameters is safe.'
• Split broadcast_message into composition at the agent level. Remove this tool and let agents call send_message in a loop for each target. This reduces tool coupling and lets agents handle per-target failures independently.