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pghdma

CallRail MCP

get_text_message

Retrieve the complete history of an SMS conversation, including all messages, using its conversation ID.

Instructions

Get full detail for one SMS conversation, including all messages.

Args: conversation_id: Short alphanumeric conversation id (e.g. '8hw3p'). Returned by list_text_messages as id on each conversation.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
account_idNo
conversation_idYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior4/5

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

With no annotations, the description discloses that the tool returns full conversation details including all messages. It explains the conversation_id parameter format. However, it does not mention any potential side effects or limitations, but as a read operation this is adequate.

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 extremely concise, with two clear sentences for purpose followed by a structured Args section. Every sentence adds value with no repetition or filler.

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?

Given the presence of an output schema, the description does not need to detail return values. It is complete for a 'get' operation, but the missing explanation of account_id slightly reduces completeness. Overall, it adequately covers the tool's functionality.

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

Parameters2/5

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

Schema description coverage is 0%, so the description must explain parameters. It only describes conversation_id (with example) but omits account_id entirely, leaving its purpose unclear. This is a significant gap.

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 action ('Get') and the resource ('full detail for one SMS conversation, including all messages'). It distinguishes from sibling tools like list_text_messages by specifying retrieval of a single conversation with full detail.

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 implies usage when full detail of a single conversation is needed. It does not explicitly state when not to use or mention alternatives, but the context of 'Get' vs 'List' is clear from the name and sibling tools.

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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