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Contract Testing: List Pacticipant Versions

contract-testing_list_pacticipant_versions

Read-onlyIdempotent

Retrieve all versions for a specified pacticipant, with page number and page size controls, to inspect contract-testing version history.

Instructions

Retrieve all versions for a given pacticipant.

Toolset: Branches and Versions

Parameters:

pacticipantName (string) required: Name of the pacticipant
pageNumber (number): Page number (default: 1)
pageSize (number): Results per page (default: 5)

Input Schema

Name	Required	Description
`pageSize`	No	Results per page
`pageNumber`	No	Page number
`pacticipantName`	Yes	Name of the pacticipant

Output Schema

Name	Required	Description	Default
`page`	No
`_links`	No
`_embedded`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedv0.43.0Nov 3, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$defs": {
+    "Contact": {
+      "additionalProperties": {},
+      "properties": {
+        "details": {
+          "additionalProperties": {},
+          "properties": {},
+          "type": "object"
+        },
+        "name": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "EmbeddedBranchVersion": {
+      "additionalProperties": {},
+      "properties": {
+        "_links": {
+          "additionalProperties": {},
+          "properties": {
+            "self": {
+              "$ref": "#/$defs/EmbeddedLink"
+            }
+          },
+          "type": "object"
+        },
+        "latest": {
+          "type": "boolean"
+        },
+        "name": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "EmbeddedDeployedVersion": {
+      "additionalProperties": {},
+      "properties": {
+        "_embedded": {
+          "additionalProperties": {},
+          "properties": {
+            "environment": {
+              "$ref": "#/$defs/Environment"
+            },
+            "pacticipant": {
+              "$ref": "#/$defs/EmbeddedNamed"
+            },
+            "version": {
+              "$ref": "#/$defs/EmbeddedVersion"
+            }
+          },
+          "type": "object"
+        },
+        "_links": {
+          "additionalProperties": {},
+          "properties": {
+            "self": {
+              "$ref": "#/$defs/EmbeddedLink"
+            }
+          },
+          "type": "object"
+        },
+        "applicationInstance": {
+          "type": "string"
+        },
+        "createdAt": {
+          "type": "string"
+        },
+        "currentlyDeployed": {
+          "type": "boolean"
+        },
+        "target": {
+          "type": "string"
+        },
+        "uuid": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "EmbeddedLink": {
+      "additionalProperties": {},
+      "properties": {
+        "href": {
+          "type": "string"
+        },
+        "name": {
+          "type": "string"
+        },
+        "templated": {
+          "type": "boolean"
+        },
+        "title": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "EmbeddedNamed": {
+      "additionalProperties": {},
+      "properties": {
+        "_links": {
+          "additionalProperties": {},
+          "properties": {
+            "self": {
+              "$ref": "#/$defs/EmbeddedLink"
+            }
+          },
+          "type": "object"
+        },
+        "name": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "EmbeddedReleasedVersion": {
+      "additionalProperties": {},
+      "properties": {
+        "_embedded": {
+          "additionalProperties": {},
+          "properties": {
+            "environment": {
+              "$ref": "#/$defs/Environment"
+            },
+            "pacticipant": {
+              "$ref": "#/$defs/EmbeddedNamed"
+            },
+            "version": {
+              "$ref": "#/$defs/EmbeddedVersion"
+            }
+          },
+          "type": "object"
+        },
+        "_links": {
+          "additionalProperties": {},
+          "properties": {
+            "self": {
+              "$ref": "#/$defs/EmbeddedLink"
+            }
+          },
+          "type": "object"
+        },
+        "createdAt": {
+          "type": "string"
+        },
+        "currentlySupported": {
+          "type": "boolean"
+        },
+        "uuid": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "EmbeddedTeam": {
+      "additionalProperties": {},
+      "properties": {
+        "_links": {
+          "additionalProperties": {},
+          "properties": {
+            "self": {
+              "$ref": "#/$defs/EmbeddedLink"
+            }
+          },
+          "type": "object"
+        },
+        "isDefault": {
+          "type": "boolean"
+        },
+        "name": {
+          "type": "string"
+        },
+        "uuid": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "EmbeddedVersion": {
+      "additionalProperties": {},
+      "properties": {
+        "_links": {
+          "additionalProperties": {},
+          "properties": {
+            "self": {
+              "$ref": "#/$defs/EmbeddedLink"
+            }
+          },
+          "type": "object"
+        },
+        "number": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "Environment": {
+      "additionalProperties": {},
+      "properties": {
+        "_embedded": {
+          "additionalProperties": {},
+          "properties": {
+            "teams": {
+              "items": {
+                "$ref": "#/$defs/EmbeddedTeam"
+              },
+              "type": "array"
+            }
+          },
+          "type": "object"
+        },
+        "_links": {
+          "additionalProperties": {},
+          "properties": {
+            "pb:currently-deployed-deployed-versions": {
+              "$ref": "#/$defs/EmbeddedLink"
+            },
+            "pb:currently-supported-released-versions": {
+              "$ref": "#/$defs/EmbeddedLink"
+            },
+            "pb:environments": {
+              "$ref": "#/$defs/EmbeddedLink"
+            },
+            "self": {
+              "$ref": "#/$defs/EmbeddedLink"
+            }
+          },
+          "type": "object"
+        },
+        "contacts": {
+          "items": {
+            "$ref": "#/$defs/Contact"
+          },
+          "type": "array"
+        },
+        "createdAt": {
+          "type": "string"
+        },
+        "displayName": {
+          "type": "string"
+        },
+        "isDefault": {
+          "type": "boolean"
+        },
+        "name": {
+          "type": "string"
+        },
+        "production": {
+          "type": "boolean"
+        },
+        "teamUuids": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "updatedAt": {
+          "type": "string"
+        },
+        "uuid": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "PacticipantVersionInCollection": {
+      "additionalProperties": {},
+      "properties": {
+        "_embedded": {
+          "additionalProperties": {},
+          "properties": {
+            "branchVersions": {
+              "items": {
+                "$ref": "#/$defs/EmbeddedBranchVersion"
+              },
+              "type": "array"
+            },
+            "deployedVersions": {
+              "items": {
+                "$ref": "#/$defs/EmbeddedDeployedVersion"
+              },
+              "type": "array"
+            },
+            "releasedVersions": {
+              "items": {
+                "$ref": "#/$defs/EmbeddedReleasedVersion"
+              },
+              "type": "array"
+            },
+            "tags": {
+              "items": {
+                "$ref": "#/$defs/EmbeddedNamed"
+              },
+              "type": "array"
+            }
+          },
+          "type": "object"
+        },
+        "_links": {
+          "additionalProperties": {},
+          "properties": {
+            "curies": {
+              "items": {
+                "$ref": "#/$defs/EmbeddedLink"
+              },
+              "type": "array"
+            },
+            "pb:latest-verification-results-where-pacticipant-is-consumer": {
+              "$ref": "#/$defs/EmbeddedLink"
+            },
+            "pb:pact-versions": {
+              "items": {
+                "$ref": "#/$defs/EmbeddedLink"
+              },
+              "type": "array"
+            },
+            "pb:pacticipant": {
+              "$ref": "#/$defs/EmbeddedLink"
+            },
+            "pb:tag": {
+              "$ref": "#/$defs/EmbeddedLink"
+            },
+            "self": {
+              "$ref": "#/$defs/EmbeddedLink"
+            }
+          },
+          "type": "object"
+        },
+        "buildUrl": {
+          "description": "Setting the buildUrl in the version resource is deprecated as it is now set when publishing consumer and provider contracts using the /contracts/publish and /provider-contracts/provider/{provider_name}/publish endpoints.",
+          "type": "string"
+        },
+        "createdAt": {
+          "type": "string"
+        },
+        "number": {
+          "type": "string"
+        },
+        "updatedAt": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "Page": {
+      "additionalProperties": {},
+      "properties": {
+        "number": {
+          "type": "number"
+        },
+        "size": {
+          "type": "number"
+        },
+        "totalElements": {
+          "type": "number"
+        },
+        "totalPages": {
+          "type": "number"
+        }
+      },
+      "type": "object"
+    }
+  },
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "additionalProperties": {},
+  "properties": {
+    "_embedded": {
+      "additionalProperties": {},
+      "properties": {
+        "versions": {
+          "items": {
+            "$ref": "#/$defs/PacticipantVersionInCollection"
+          },
+          "type": "array"
+        }
+      },
+      "type": "object"
+    },
+    "_links": {
+      "additionalProperties": {},
+      "properties": {
+        "next": {
+          "$ref": "#/$defs/EmbeddedLink"
+        },
+        "pacticipant": {
+          "$ref": "#/$defs/EmbeddedLink"
+        },
+        "pb:pacticipant": {
+          "$ref": "#/$defs/EmbeddedLink"
+        },
+        "pb:versions": {
+          "items": {
+            "$ref": "#/$defs/EmbeddedLink"
+          },
+          "type": "array"
+        },
+        "previous": {
+          "$ref": "#/$defs/EmbeddedLink"
+        },
+        "self": {
+          "$ref": "#/$defs/EmbeddedLink"
+        },
+        "versions": {
+          "description": "Use pb:versions",
+          "items": {
+            "$ref": "#/$defs/EmbeddedLink"
+          },
+          "type": "array"
+        }
+      },
+      "type": "object"
+    },
+    "page": {
+      "$ref": "#/$defs/Page"
+    }
+  },
+  "type": "object"
+}

Addedv0.40.0Sep 3, 2026
Removedv0.34.0Aug 7, 2026
First observedv0.27.1Jun 29, 2026

TDQS

B3.1/5.0

Behavior3/5

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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered. The description adds nothing beyond that except restating the pagination defaults, and it does not mention result ordering, behavior when the pacticipant does not exist, or how many total versions are typically returned.

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

Conciseness3/5

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

The core purpose is front-loaded in a single clear sentence, which is good. However, the definition then spends most of its length on a toolset line and a parameter list that duplicates the 100%-covered schema, so a substantial fraction of the text does not earn its place.

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?

An output schema exists, so return values need not be explained, and the tool is simple with only three parameters. What remains missing is any disambiguation from the many version-related siblings and any note about behavior for an unknown pacticipant name, which matters because pacticipantName is the sole required argument.

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 schema already documents all three parameters with their defaults. The description's parameter block repeats the schema text verbatim ("Results per page", "Page number") and adds no meaning such as ordering semantics, maximum page size, or whether pageNumber is 1-based in practice.

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?

The description uses a specific verb and resource ("Retrieve all versions for a given pacticipant"), which clearly separates it from singular siblings like contract-testing_get_pacticipant_version and contract-testing_get_latest_pacticipant_version. It never names those siblings explicitly, so the differentiation is inferred rather than stated.

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?

There is no when-to-use guidance at all: nothing says whether to prefer this over get_branch_versions, get_latest_pacticipant_version, or list_deployed_or_released_versions. The only context is the toolset label "Branches and Versions," which hints at scope but does not route the agent.

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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