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locator-mcp

locator-mcp

by Eswarr11
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

get_locator

Retrieve a specific element locator by key from a named registry file. Provide the registry filename and element key to get the locator entry.

Instructions

Return a single element locator entry by key from a named registry.

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": {
      "scanName": "<scanName>",
      "key": "<key>"
    },
    "name": "get_locator"
  }
}

Input Schema

NameRequiredDescriptionDefault
scanNameYesRegistry filename without .json.
keyYesElement key from the registry.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.3/5.0
Behavior2/5

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

No annotations are available, so the description must fully disclose behavior. It only states that a single locator entry is returned, but omits important details like error handling for missing keys, side effects (none expected, not stated), or response format. This is insufficient for a mutation-free lookup tool.

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 a single sentence with no extraneous content. It is concise and front-loaded, conveying the essential purpose immediately.

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

Completeness3/5

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

Given the low complexity (2 required parameters, no output schema, no annotations), the description covers the basic operation but lacks details on return structure and error behavior. For a simple lookup tool, it is minimally complete but could benefit from mentioning that the locator entry is returned as an object with specific fields.

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 baseline is 3. The description adds no extra meaning beyond the schema; it merely restates that the tool operates by key and registry name. The parameter descriptions in the schema already clarify the parameters adequately.

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 returns a single element locator entry by key from a named registry. It uses a specific verb ('Return') and resource ('single element locator entry'), and distinguishes from siblings like 'get_registry' (returns entire registry) and 'get_registry_keys' (returns keys only).

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?

The description does not provide any guidance on when to use this tool versus alternatives such as 'search_registry' or 'get_registry'. It lacks explicit usage context, prerequisites, or exclusions, leaving the agent without decision support.

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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