Endurance Wire

Get releases

get_releases

Read-onlyIdempotent

List product releases, newest first. Filter by brand, product line, or date. Each release includes recorded case_sizes_mm, size_variants with size-attributable specifications, and buy_links. Unknown sizes are explicitly marked.

Input Schema

TableJSON Schema

Name	Required	Description
`line`	No	One of: running, outdoor, cycling, lifestyle, handheld, dive, aviation, golf, marine, accessories, recovery
`brand`	No	One of: garmin, coros, suunto, apple, amazfit, wahoo, polar, whoop, oura
`limit`	No	Max results, default 50
`since`	No	Only releases on/after this date, "YYYY" or "YYYY-MM"

Output Schema

TableJSON Schema

Name	Required	Description
`_via`	Yes	Source attribution for Endurance Wire
`count`	Yes
`releases`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 7, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "_via": {
+      "description": "Source attribution for Endurance Wire",
+      "type": "string"
+    },
+    "count": {
+      "type": "integer"
+    },
+    "releases": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "available": {
+            "type": "string"
+          },
+          "brand": {
+            "type": "string"
+          },
+          "buy_links": {
+            "description": "Verified buying destinations; an empty list does not mean out of stock",
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "merchant": {
+                  "type": "string"
+                },
+                "region": {
+                  "type": "string"
+                },
+                "url": {
+                  "format": "uri",
+                  "type": "string"
+                }
+              },
+              "required": [
+                "merchant",
+                "region",
+                "url"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "case_sizes_mm": {
+            "description": "Recorded case sizes in mm; an empty list means unknown",
+            "items": {
+              "type": "number"
+            },
+            "type": "array"
+          },
+          "colors": {
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "img": {
+                  "format": "uri",
+                  "type": "string"
+                },
+                "label": {
+                  "type": "string"
+                }
+              },
+              "required": [
+                "label",
+                "img"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "date": {
+            "description": "Announcement date, YYYY-MM or YYYY-MM-DD",
+            "type": "string"
+          },
+          "family": {
+            "type": "string"
+          },
+          "img": {
+            "format": "uri",
+            "type": "string"
+          },
+          "line": {
+            "type": "string"
+          },
+          "name": {
+            "type": "string"
+          },
+          "note": {
+            "type": "string"
+          },
+          "price": {
+            "description": "Historical launch price in its original currency, not a current offer",
+            "type": "string"
+          },
+          "priceCurrency": {
+            "description": "Defaults to USD when omitted",
+            "enum": [
+              "USD",
+              "EUR"
+            ],
+            "type": "string"
+          },
+          "size_data_status": {
+            "enum": [
+              "recorded",
+              "unknown"
+            ],
+            "type": "string"
+          },
+          "size_scope_note": {
+            "description": "Limits on size-specific claims",
+            "type": "string"
+          },
+          "size_variants": {
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "case_size_mm": {
+                  "type": "number"
+                },
+                "name": {
+                  "type": "string"
+                },
+                "notes": {
+                  "additionalProperties": {
+                    "type": "string"
+                  },
+                  "description": "Edition, material and other qualifications",
+                  "type": "object"
+                },
+                "specs": {
+                  "additionalProperties": {
+                    "type": "string"
+                  },
+                  "description": "Verified size-specific specifications, keyed by label",
+                  "type": "object"
+                },
+                "unresolved_specs": {
+                  "description": "Labels with no verified size-specific value",
+                  "items": {
+                    "type": "string"
+                  },
+                  "type": "array"
+                }
+              },
+              "required": [
+                "name",
+                "case_size_mm",
+                "specs",
+                "notes",
+                "unresolved_specs"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "src": {
+            "description": "Manufacturer reference",
+            "format": "uri",
+            "type": "string"
+          },
+          "take": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "brand",
+          "name",
+          "line",
+          "date",
+          "price",
+          "case_sizes_mm",
+          "size_data_status",
+          "size_scope_note",
+          "size_variants",
+          "buy_links"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    }
+  },
+  "required": [
+    "_via",
+    "count",
+    "releases"
+  ],
+  "type": "object"
+}

First observedOct 7, 2026

TDQS

A3.5/5.0

Behavior3/5

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

Annotations already declare this a read-only, idempotent, non-destructive, closed-world operation, so the safety profile is covered. The description adds one genuinely useful behavioral note — that unknown sizes are explicitly marked — but otherwise restates return content that the output schema already defines.

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

Conciseness4/5

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

Three short sentences, front-loaded with the core verb and ordering, then filters, then payload. The third sentence partially duplicates the output schema, which keeps it from being perfectly lean, but nothing is bloated.

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?

With an output schema documenting the return shape and annotations covering the safety profile, the description only needs to establish purpose, ordering, and filterability — which it does. The only minor gap is the absence of guidance on alternatives.

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 all four parameters (line, brand, limit, since) are already documented with enums and formats. The description only echoes brand, product line, and date filtering without adding syntax or defaults, so baseline 3 is correct.

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?

States a specific verb and resource ('List product releases') plus ordering ('newest first'), so the agent immediately knows the operation. It does not explicitly distinguish itself from siblings like get_product or compare_generations, but the scope (a list of releases) is clear enough to disambiguate in practice.

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?

The description says what can be filtered ('by brand, product line, or date'), which implies usage, but never states when to choose this tool over get_product or compare_generations, nor any exclusions or prerequisites. Adequate but leaves routing to inference.

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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