Spytrend

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

Name	Required	Description	Default
`webmaster_id`	Yes	source webmaster UUID from search_webmasters

Output Schema

Name	Required	Description
`data`	No
`error`	No	Present only when isError is true: machine-readable failure. The human explanation stays in content.
`params`	No	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.
`addon_hints`	No	Add-on modules that have additional data for objects of this result (no prices, no paid values). subscription_status=active: the account has the module — use its normal path. Do not push a purchase the user did not ask about.
`webmaster_id`	No
`similarity_basis`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 23, 2026

addedOutput schema / properties / addon_hints

Added value: +{
+  "description": "Add-on modules that have additional data for objects of this result (no prices, no paid values). subscription_status=active: the account has the module — use its normal path. Do not push a purchase the user did not ask about.",
+  "items": {
+    "properties": {
+      "available_data_types": {
+        "description": "kinds of data the module confirmedly has for the object",
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "info_url": {
+        "description": "the object (or its limited breakdown) inside the module on spytrend.com",
+        "type": "string"
+      },
+      "module": {
+        "description": "nutra | crypto | web2app | search_arb | startups",
+        "type": "string"
+      },
+      "object_id": {
+        "description": "the ad id, or the site domain for site rows",
+        "type": "string"
+      },
+      "preland_downloadable": {
+        "description": "Nutra / Crypto: the saved pre-lander can be downloaded in the module",
+        "type": "boolean"
+      },
+      "subscription_status": {
+        "description": "active | not_connected",
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Changed3 schema fields changedSep 25, 2026

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"
-]

First observedSep 2, 2026

TDQS

A3.8/5.0

Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so safety is covered. The description adds real behavioral context beyond that: it explains what 'similarity' means semantically and that only facets with at least one other match are returned (an implicit filter on results). The 'FREE' note is useful cost information not present in 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?

Four short sentences, each carrying distinct information: purpose, a disambiguation of 'similarity', a result-filter guarantee, and cost. The key semantic disambiguation is front-loaded rather than buried, and there is no filler.

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?

An output schema exists so return shape need not be described, the single parameter is fully documented in schema, and annotations cover the safety profile. What remains is a light gap: the relationship to find_similar_webmasters (the natural follow-up call) is never made explicit.

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 coverage is 100% and the single parameter is documented as 'source webmaster UUID from search_webmasters', which already gives origin and type. The description adds no syntax, format, or sourcing detail beyond the schema. Baseline 3 applies when the schema does the work.

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

Purpose4/5

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

Uses a specific verb and resource: 'List the URL-parameter keys and normalized values' that identify related webmasters. It also pre-empts a likely misreading by defining similarity as shared affiliate/tracking parameter values rather than name or domain matching. It never names the sibling find_similar_webmasters, so the boundary between 'discover facets' and 'fetch matches' is left implicit.

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

Usage Guidelines3/5

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

'can be used to find related webmasters' implies this is a discovery step preceding find_similar_webmasters, but the relationship is never stated explicitly and no alternative is named. There are no exclusions or prerequisites beyond the required webmaster_id. Usage must be inferred rather than read.

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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