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RHMDHDYT

Google Chat MCP Server

by RHMDHDYT

send_message

Post a new message to a Google Chat space or direct message, creating a new thread.

Instructions

Send a new message (starts a new 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
textYesMessage text
Behavior2/5

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

No annotations are provided, and the description lacks detail on behavioral aspects such as authentication requirements, side effects, or idempotency. The only behavioral cue is 'starts a new thread,' which is insufficient for a mutation tool with no annotation coverage.

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?

The description is a single, concise sentence that efficiently conveys the core action without extraneous words. Every part is necessary and clear.

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

Completeness3/5

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

The tool has three parameters and no output schema or annotations. The description covers the basic action but omits return values, error handling, and any behavioral context, making it incomplete for an agent to fully anticipate behavior.

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 coverage is 100%, so the input schema already documents all parameters adequately. The description adds no new semantics beyond the schema, making it baseline adequate but not enhancing understanding.

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?

The description clearly states the tool sends a new message, differentiating it from the sibling tool 'reply_message' which replies in an existing thread. It specifies the context 'in a space or DM' and notes that it starts a new thread, making the purpose unambiguous.

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

Usage Guidelines4/5

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

The description implicitly guides usage by contrasting with 'reply_message' (starting a new thread vs replying), but does not explicitly state when to use or avoid this tool. No prerequisites or exclusion criteria are provided, leaving room for ambiguity.

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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