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Get webmaster similarity facets

get_webmaster_similarity_facets
Read-onlyIdempotent

List the URL-parameter keys and normalized values that can be used to find related webmasters. Similarity here means shared affiliate/tracking parameter values, not name or domain similarity. Returns only facets that have at least one other webmaster match. FREE.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
webmaster_idYessource webmaster UUID from search_webmasters

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
dataNo
errorNoPresent only when isError is true: machine-readable failure. The human explanation stays in content.
paramsNoRequest parameter echo: applied = parameters that shaped this result; normalized = parameters rewritten before applying (alias, type coercion, resolved id); ignored = parameters that were accepted but NOT applied, with the reason.
webmaster_idNo
similarity_basisNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed3 schema fields changed
    • addedOutput schema / properties / error
      Added value: +{
+  "description": "Present only when isError is true: machine-readable failure. The human explanation stays in content.",
+  "properties": {
+    "code": {
+      "description": "fine-grained, stable failure code (e.g. invalid_arguments, backend_busy)",
+      "type": "string"
+    },
+    "kind": {
+      "description": "failure class: invalid_argument, not_found, permission_denied, unauthenticated, quota_exceeded, rate_limited, temporarily_unavailable, unavailable_until_ready, unsupported, internal",
+      "type": "string"
+    },
+    "message": {
+      "description": "the same human text as content[0]",
+      "type": "string"
+    },
+    "outcome": {
+      "description": "activity-feed outcome class",
+      "type": "string"
+    },
+    "param": {
+      "description": "the request parameter the failure is about, when known",
+      "type": "string"
+    },
+    "retry_after_seconds": {
+      "description": "wait this long before retrying",
+      "type": "integer"
+    },
+    "retryable": {
+      "description": "true when repeating the SAME call can succeed (after retry_after_seconds when present)",
+      "type": "boolean"
+    }
+  },
+  "type": "object"
+}
    • addedOutput schema / properties / params
      Added value: +{
+  "description": "Request parameter echo: applied = parameters that shaped this result; normalized = parameters rewritten before applying (alias, type coercion, resolved id); ignored = parameters that were accepted but NOT applied, with the reason.",
+  "properties": {
+    "applied": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "ignored": {
+      "items": {
+        "properties": {
+          "param": {
+            "type": "string"
+          },
+          "reason": {
+            "type": "string"
+          },
+          "to": {
+            "description": "the parameter it was applied as, when renamed",
+            "type": "string"
+          },
+          "value": {
+            "description": "the value actually applied, when rewritten",
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "normalized": {
+      "items": {
+        "properties": {
+          "param": {
+            "type": "string"
+          },
+          "reason": {
+            "type": "string"
+          },
+          "to": {
+            "description": "the parameter it was applied as, when renamed",
+            "type": "string"
+          },
+          "value": {
+            "description": "the value actually applied, when rewritten",
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    }
+  },
+  "type": "object"
+}
    • removedOutput schema / required
      Removed value: -[
-  "webmaster_id",
-  "similarity_basis",
-  "data"
-]
  2. First observed

TDQS

A4.3/5.0
Behavior4/5

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

Annotations already declare the operation read-only, idempotent, open-world, and non-destructive. The description adds meaningful behavior beyond that: it returns only facets with at least one other webmaster match, returns normalized values, and explicitly notes the tool is FREE. No contradiction with annotations.

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?

Three compact sentences deliver the core action, the special meaning of similarity, the filtering behavior, and cost status without wasted words. The key purpose is front-loaded, and every sentence contributes information.

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

Completeness5/5

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

For a one-parameter read-only tool with a full output schema and rich annotations, the description covers the essential decision factors: what it returns, what it excludes, what 'similarity' means, and that it is free. Nothing critical is missing for an agent to invoke it correctly.

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?

The single parameter webmaster_id is fully documented in the schema with its type and source ('source webmaster UUID from search_webmasters'), and schema description coverage is 100%. The description does not add parameter-specific detail, but it does not need to because the schema already carries the meaning.

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 names a specific verb ('List') and resource ('URL-parameter keys and normalized values') and clearly distinguishes the similarity concept from name/domain similarity. It is immediately distinguishable from siblings like find_similar_webmasters and search_webmasters because it returns facets rather than webmaster results.

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 explains that this tool produces inputs for finding related webmasters and clarifies the type of similarity involved, which provides useful selection context. It does not explicitly name find_similar_webmasters as the alternative for getting actual related webmasters, so some inference is still required.

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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