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Lexmata

GitHub Projects MCP Server

by Lexmata

create_field

Create a custom field for a GitHub Project V2, supporting text, number, date, single select, and iteration types.

Instructions

Create a new custom field in a GitHub Project V2

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
projectIdYesThe global ID of the project
nameYesName of the field
dataTypeYesType of field
singleSelectOptionsNoOptions for SINGLE_SELECT fields
Behavior2/5

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

No annotations provided; description only states 'create' without disclosing behavioral traits like idempotency, limits, or authorization requirements.

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?

Single sentence with no extraneous words, front-loading the essential information.

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

Completeness2/5

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

For a creation tool with no output schema, description lacks return value info and conditional parameter guidance. Incomplete for agent to fully understand 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 covers all 4 parameters (100% coverage). Description adds no extra meaning beyond schema, e.g., conditional requirement for singleSelectOptions not mentioned.

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?

Description clearly states the action (create), resource (custom field), and context (GitHub Project V2), distinguishing it from siblings like update_field or delete_field.

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 on when to use this tool vs alternatives (e.g., update_field) or prerequisites. Siblings provide related operations but no context given.

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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