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multimodal-imessage-mcp

multimodal-imessage-mcp

by tszaks
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
Local

react_to_message

React to iMessages with emoji reactions (❤️, 👍, 👎, 😂, ‼️, ❓). Confirms the reaction before sending to ensure accuracy.

Instructions

React to a message with an emoji (❤️, 👍, 👎, 😂, ‼️, ❓). IMPORTANT: Always show the user which message and reaction before sending, and get explicit confirmation.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "message_id": "<message_id>",
      "reaction": "<reaction>",
      "confirm": "<confirm>"
    },
    "name": "react_to_message"
  }
}

Input Schema

NameRequiredDescriptionDefault
confirmYesMust be set to true to actually send the reaction. This forces explicit confirmation.
reactionYesReaction emoji: love (❤️), like (👍), dislike (👎), laugh (😂), emphasize (‼️), question (❓)
message_idYesThe message ID to react to (from conversation results)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.5.1

TDQS

A4.2/5.0
Behavior4/5

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

With no annotations provided, the description carries the full burden. It discloses the confirmation requirement and lists supported reactions, but does not detail permission requirements or reversibility. The core behavioral constraint (confirmation) is clearly communicated.

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 two sentences, front-loaded with purpose and followed by a critical safety instruction. No redundancy or wasted words.

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

Completeness4/5

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

For a low-complexity tool with exhaustive schema descriptions, the description covers purpose and the key confirmation behavior. It does not explain return values, but no output schema exists and the tool's behavior is straightforward.

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 the description need not add parameter details. The description does restate the emoji mapping but adds no new parameter semantics beyond the schema's existing descriptions.

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's function: 'React to a message with an emoji,' enumerating specific emoji options. This distinguishes it from sibling tools like send_message or read_recent_messages.

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?

It explicitly instructs the agent to 'Always show the user which message and reaction before sending, and get explicit confirmation,' providing a clear safety protocol. It does not explicitly name alternatives, but the action (reaction vs sending) is unambiguous.

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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