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1msg

1msg MCP

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by 1msg

send_button

Send an interactive message with reply buttons to a phone number. Use this to present selectable options to contacts via the 1msg Chat API.

Instructions

Send Reply Buttons Message

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
bodyNo
phoneNo
footerNo
sectionsNo
Behavior2/5

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

With no annotations, the description carries the full burden, but it only says 'Send Reply Buttons Message' without disclosing side effects, permissions, or response behavior. It doesn't even clarify whether this is a write operation or what happens after sending.

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

Conciseness2/5

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

The description is extremely short, which is efficient, but it sacrifices necessary information. It is closer to under-specification than appropriate conciseness.

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

Completeness1/5

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

With no annotations, no output schema, and an uninformative description, the tool context is severely incomplete. Four parameters are left unexplained, and the tool's behavior and edge cases are absent.

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

Parameters1/5

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

Schema coverage is 0% and the description provides no explanation of body, phone, footer, or sections. The schema property names hint at meaning, but the description adds no value, forcing agents to guess.

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

Purpose4/5

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

The description states a specific action ('Send') and resource ('Reply Buttons Message'), which distinguishes it from sibling tools like send_message or send_list. However, it lacks scope or elaboration, making it clear but not outstanding.

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

Usage Guidelines2/5

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

No guidance is provided on when to use this tool versus alternatives like send_list or send_carousel. The description only names the action; there are no context cues, prerequisites, or exclusions.

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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