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Contract Testing: Get Latest Pacticipant Version

contract-testing_get_latest_pacticipant_version

Read-onlyIdempotent

Retrieve a pacticipant's current version, optionally filtered by tag, to identify the build or release for contract testing.

Instructions

Retrieve the latest version of a pacticipant, optionally filtered by tag.

Toolset: Branches and Versions

Parameters:

pacticipantName (string) required: Name of the pacticipant
tag (string): Tag to filter by. If omitted, returns the overall latest version.

Input Schema

Name	Required	Description	Default
`tag`	No	Tag to filter by. If omitted, returns the overall latest version.
`pacticipantName`	Yes	Name of the pacticipant

Output Schema

Name	Required	Description
`_links`	No
`number`	No
`buildUrl`	No	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.
`_embedded`	No
`createdAt`	No
`updatedAt`	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": "#/$defs/Contact"
+          },
+          "type": "array"
+        },
+        "createdAt": {
+          "type": "string"
+        },
+        "displayName": {
+          "type": "string"
+        },
+        "isDefault": {
+          "type": "boolean"
+        },
+        "name": {
+          "type": "string"
+        },
+        "production": {
+          "type": "boolean"
+        },
+        "teamUuids": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "updatedAt": {
+          "type": "string"
+        },
+        "uuid": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    }
+  },
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "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:record-deployment": {
+          "items": {
+            "$ref": "#/$defs/EmbeddedLink"
+          },
+          "type": "array"
+        },
+        "pb:record-release": {
+          "items": {
+            "$ref": "#/$defs/EmbeddedLink"
+          },
+          "type": "array"
+        },
+        "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"
+}

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

TDQS

A3.5/5.0

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 by structured data. The description adds only the tag-filtering behavior, with no mention of what happens when no versions exist, whether a tag with no matches errors or returns empty, or authentication expectations.

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?

The description is short and front-loads the one-sentence purpose before the metadata blocks, so nothing is buried. The explicit parameter restatement duplicates schema content that the agent will already see, which is minor waste but keeps it from a 5.

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 only two parameters, an output schema present, and rich annotations, the definition supplies enough to call the tool correctly; return values need not be explained. The only real gap is the absence of routing guidance among the several closely named version-related siblings.

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% and the description's parameter list restates the schema text verbatim ('Tag to filter by. If omitted, returns the overall latest version.'), adding no new meaning. Baseline 3 applies since the schema already carries full parameter documentation.

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 states a specific verb and resource ('Retrieve the latest version of a pacticipant') and the 'latest' qualifier separates it from list-style siblings such as contract-testing_list_pacticipant_versions. It does not, however, explicitly distinguish itself from contract-testing_get_pacticipant_version or contract-testing_get_branch_versions, leaving the agent to infer which one returns the newest record.

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?

Usage is only implied: 'optionally filtered by tag' and 'If omitted, returns the overall latest version' tell the agent how the tag changes behavior, but there is no statement of when to prefer this tool over the sibling version-list or branch-version tools. No exclusions or prerequisites are given.

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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