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RHMDHDYT

Google Chat MCP Server

by RHMDHDYT

reply_message

Reply to an existing thread in a Google Chat space or direct message with the specified text.

Instructions

Reply to an existing thread in a space or DM

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
group_idYesSpace/DM group ID (from list_spaces)
is_dmNoTrue if DM, False if room/space
topic_idYesThread ID to reply to (from read_messages)
textYesReply text
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided, so description carries full burden. Only states 'Reply to an existing thread', lacking details on permission requirements, notification behavior, error conditions, or whether it's safe to call multiple times.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Single sentence with no wasted words. Front-loaded with the core action.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Despite 4 parameters and no output schema, the description gives no information about return values, limitations, or error cases. Lacks depth compared to the complexity of the tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so baseline is 3. Description adds no extra parameter context beyond what the schema already provides.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Description clearly states 'Reply to an existing thread in a space or DM', using a specific verb and resource. It distinguishes from siblings like 'send_message' (new message) and 'create_dm'.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Implied usage for replying to existing threads, but no explicit when-to-use or when-not-to-use compared to siblings like 'send_message' or 'read_messages'. No alternatives mentioned.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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