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CallRail MCP

create_tag

Create a tag for a CallRail company. Specify the tag name and optional color from 24 supported options.

Instructions

Create a new tag scoped to one company.

Args: name: Tag display name. company_id: Required — tags are per-company in CallRail. account_id: Auto-resolves if omitted. color: One of the 24 CallRail-supported colors (see VALID_TAG_COLORS): gray1-2, blue1-2, cyan1-2, purple1-2, pink1-4, red1-2, orange1-4, yellow1-2, green1-4. If omitted, CallRail defaults to 'gray1'.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYes
colorNo
account_idNo
company_idYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

No annotations are provided, and the description does not disclose behavioral traits beyond basic creation. It does not mention reversibility, idempotency, rate limits, or what happens if a duplicate name is used.

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

Conciseness4/5

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

The description is well-structured with an Args block and front-loaded purpose. It is slightly verbose but every sentence adds value, making it effective while not overly concise.

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 that an output schema exists, the description does not need to explain return values. It covers the purpose and all parameters adequately, making it complete for a creation tool.

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

Parameters5/5

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

Despite 0% schema description coverage, the description adds significant meaning: it explains the name, company_id requirement, auto-resolution of account_id, and details the color parameter with a list of valid options and default value. This compensates for the schema's lack of 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 'Create a new tag scoped to one company.' This is a specific verb+resource combination that distinguishes itself from sibling tools like update_tag, delete_tag, and list_tags.

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 explicit guidance on when to use this tool versus alternatives. It mentions that tags are per-company and company_id is required, but does not explain when to use create_tag vs update_tag or add_call_tags.

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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