UIKit MCP Server

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 that the tool fetches source code from GitHub using a file path from a manifest, which adds useful behavioral context about the data source and process. However, it doesn't mention potential limitations like rate limits, authentication needs, error conditions, or what happens if the ID doesn't exist.

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

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

The description is perfectly concise with three sentences that each earn their place: stating the purpose, specifying ID requirements, and explaining the GitHub fetching mechanism. It's front-loaded with the core purpose and wastes no words.

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

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

Given the tool's moderate complexity (fetching code from GitHub), no annotations, and the presence of an output schema (which handles return values), the description is reasonably complete. It covers purpose, parameter semantics, and behavioral context about the GitHub source. The main gap is lack of error/limitation information, but the output schema helps compensate.

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

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

The schema has 0% description coverage for the single parameter 'template_id'. The description compensates by explaining that 'The template ID must match one from the templates manifest,' providing crucial semantic context about where valid IDs come from and their validation requirement. This significantly adds value beyond the bare schema.

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

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

The description clearly states the specific action ('Retrieve Dart source code'), the resource ('for a specific Flutter template by ID'), and distinguishes from the sibling tool 'list_templates' by focusing on retrieving source code rather than listing templates. It provides a complete purpose statement.

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

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

The description provides clear context for when to use this tool: when you need the source code for a specific template identified by ID. It implicitly distinguishes from 'list_templates' (which lists templates rather than retrieving code) but doesn't explicitly state when NOT to use it or mention alternative tools beyond the sibling.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.