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Find Duplicate Code

find-duplicate-code
Read-onlyIdempotent

Finds duplicate executable code blocks by matching normalized statement text across selected C# methods, constructors, local functions, and accessors so you can inspect candidates for manual refactoring.

Instructions

Finds groups of whole executable blocks with identical statement text after whitespace normalisation. Use this to locate duplication candidates for manual inspection; identifiers and literal values remain significant, so this is not semantic clone detection. Scans block-bodied methods, constructors, local functions and accessors in the selected scope, or the loaded solution when scope is omitted; expression bodies and arbitrary statement subsequences are not candidates. minimumStatements defaults to 3 top-level statements per block. Returns groups with statementCount and bounded occurrences containing symbol and location pointers, without source excerpts or edits. Limits default to 25 groups and 100 occurrences per group; check groups.hasMore and each occurrences.hasMore independently.

Input Schema

NameRequiredDescriptionDefault
scopeNoThe optional search scope.
workspaceNoProvide workspaceId, alias, path, or any combination.
groupsLimitNoMaximum number of results to return.
minimumStatementsNoThe minimum statement count to consider.
occurrencesPerGroupLimitNoMaximum number of occurrences to return for each duplicate group.

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed10 schema fields changedv1.0.5
    • addedInput schema / $defs
      Added value: +{
      +  "project": {
      +    "properties": {
      +      "name": {
      +        "type": "string"
      +      },
      +      "path": {
      +        "description": "Workspace-relative path.",
      +        "type": "string"
      +      },
      +      "projectId": {
      +        "type": "string"
      +      },
      +      "targetFramework": {
      +        "type": "string"
      +      }
      +    },
      +    "type": [
      +      "object",
      +      "null"
      +    ]
      +  }
      +}
    • addedInput schema / properties / scope / properties / document / properties / project / $ref
      Added value: +"#/$defs/project"
    • removedInput schema / properties / scope / properties / document / properties / project / properties
      Removed value: -{
      -  "name": {
      -    "type": "string"
      -  },
      -  "path": {
      -    "description": "Workspace-relative path.",
      -    "type": "string"
      -  },
      -  "projectId": {
      -    "type": "string"
      -  },
      -  "targetFramework": {
      -    "type": "string"
      -  }
      -}
    • removedInput schema / properties / scope / properties / document / properties / project / type
      Removed value: -[
      -  "object",
      -  "null"
      -]
    • addedInput schema / properties / scope / properties / project / $ref
      Added value: +"#/$defs/project"
    • removedInput schema / properties / scope / properties / project / properties
      Removed value: -{
      -  "name": {
      -    "type": "string"
      -  },
      -  "path": {
      -    "description": "Workspace-relative path.",
      -    "type": "string"
      -  },
      -  "projectId": {
      -    "type": "string"
      -  },
      -  "targetFramework": {
      -    "type": "string"
      -  }
      -}
    • removedInput schema / properties / scope / properties / project / type
      Removed value: -[
      -  "object",
      -  "null"
      -]
    • addedInput schema / properties / scope / properties / projects / items / $ref
      Added value: +"#/$defs/project"
    • removedInput schema / properties / scope / properties / projects / items / properties
      Removed value: -{
      -  "name": {
      -    "type": "string"
      -  },
      -  "path": {
      -    "description": "Workspace-relative path.",
      -    "type": "string"
      -  },
      -  "projectId": {
      -    "type": "string"
      -  },
      -  "targetFramework": {
      -    "type": "string"
      -  }
      -}
    • removedInput schema / properties / scope / properties / projects / items / type
      Removed value: -[
      -  "object",
      -  "null"
      -]
  2. Changed1 schema field changedv1.0.4
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
      +  "$defs": {
      +    "warningInfo": {
      +      "properties": {
      +        "code": {
      +          "description": "The stable machine-readable warning code.",
      +          "type": "string"
      +        },
      +        "message": {
      +          "description": "The human-readable warning message.",
      +          "type": "string"
      +        }
      +      },
      +      "required": [
      +        "code",
      +        "message"
      +      ],
      +      "type": "object"
      +    }
      +  },
      +  "oneOf": [
      +    {
      +      "properties": {
      +        "data": {
      +          "description": "Tool-specific result payload.",
      +          "properties": {
      +            "groups": {
      +              "description": "The returned duplicate groups.",
      +              "properties": {
      +                "hasMore": {
      +                  "description": "Whether additional items were available beyond this page.",
      +                  "type": "boolean"
      +                },
      +                "items": {
      +                  "description": "Items returned in this page.",
      +                  "items": {
      +                    "properties": {
      +                      "occurrences": {
      +                        "description": "The group occurrences.",
      +                        "properties": {
      +                          "hasMore": {
      +                            "description": "Whether additional items were available beyond this page.",
      +                            "type": "boolean"
      +                          },
      +                          "items": {
      +                            "description": "Items returned in this page.",
      +                            "items": {
      +                              "properties": {
      +                                "location": {
      +                                  "description": "The occurrence location.",
      +                                  "properties": {
      +                                    "column": {
      +                                      "description": "The one-based column number.",
      +                                      "type": "integer"
      +                                    },
      +                                    "document": {
      +                                      "$ref": "#/properties/request/properties/value/properties/groups/properties/items/items/properties/occurrences/properties/items/items/properties/symbol/properties/location/properties/document",
      +                                      "description": "The resolved document."
      +                                    },
      +                                    "line": {
      +                                      "description": "The one-based line number.",
      +                                      "type": "integer"
      +                                    },
      +                                    "selector": {
      +                                      "$ref": "#/properties/request/properties/value/properties/groups/properties/items/items/properties/occurrences/properties/items/items/properties/symbol/properties/location/properties/selector",
      +                                      "description": "The canonical selector that can resolve this source location again."
      +                                    },
      +                                    "snapshot": {
      +                                      "$ref": "#/properties/request/properties/value/properties/groups/properties/items/items/properties/occurrences/properties/items/items/properties/symbol/properties/location/properties/snapshot",
      +                                      "description": "The exact immutable workspace snapshot associated with this location."
      +                                    },
      +                                    "span": {
      +                                      "$ref": "#/properties/request/properties/value/properties/groups/properties/items/items/properties/occurrences/properties/items/items/properties/symbol/properties/location/properties/span",
      +                                      "description": "The resolved text span."
      +                                    }
      +                                  },
      +                                  "required": [
      +                                    "snapshot"
      +                                  ],
      +                                  "type": [
      +                                    "object",
      +                                    "null"
      +                                  ]
      +                                },
      +                                "symbol": {
      +                                  "description": "The enclosing symbol.",
      +                                  "properties": {
      +                                    "displayName": {
      +                                      "description": "The display name of the symbol.",
      +                                      "type": "string"
      +                                    },
      +                                    "documentationCommentId": {
      +                                      "description": "The documentation comment identifier, when available.",
      +                                      "type": [
      +                                        "string",
      +                                        "null"
      +                                      ]
      +                                    },
      +                                    "kind": {
      +                                      "description": "The symbol kind.",
      +                                      "type": "string"
      +                                    },
      +                                    "location": {
      +                                      "description": "The optional source location of the symbol.",
      +                                      "properties": {
      +                                        "column": {
      +                                          "description": "The one-based column number.",
      +                                          "type": "integer"
      +                                        },
      +                                        "document": {
      +                                          "description": "The resolved document.",
      +                                          "properties": {
      +                                            "documentId": {
      +                                              "description": "The document identifier.",
      +                                              "type": "string"
      +                                            },
      +                                            "path": {
      +                                              "description": "The normalized document path.",
      +                                              "type": "string"
      +                                            },
      +                                            "projectId": {
      +                                              "description": "The owning project identifier.",
      +                                              "type": "string"
      +                                            }
      +                                          },
      +                                          "required": [
      +                                            "documentId",
      +                                            "path",
      +                                            "projectId"
      +                                          ],
      +                                          "type": [
      +                                            "object",
      +                                            "null"
      +                                          ]
      +                                        },
      +                                        "line": {
      +                                          "description": "The one-based line number.",
      +                                          "type": "integer"
      +                                        },
      +                                        "selector": {
      +                                          "description": "The canonical selector that can resolve this source location again.",
      +                                          "properties": {
      +                                            "span": {
      +                                              "properties": {
      +                                                "document": {
      +                                                  "description": "Provide exactly one of path or documentId.",
      +                                                  "properties": {
      +                                                    "documentId": {
      +                                                      "description": "Workspace-local document ID.",
      +                                                      "type": [
      +                                                        "string",
      +                                                        "null"
      +                                                      ]
      +                                                    },
      +                                                    "path": {
      +                                                      "description": "Workspace-relative path.",
      +                                                      "type": [
      +                                                        "string",
      +                                                        "null"
      +                                                      ]
      +                                                    },
      +                                                    "project": {
      +                                                      "description": "Disambiguates documents with matching paths or IDs.",
      +                                                      "properties": {
      +                                                        "name": {
      +                                                          "type": [
      +                                                            "string",
      +                                                            "null"
      +                                                          ]
      +                                                        },
      +                                                        "path": {
      +                                                          "description": "Workspace-relative path.",
      +                                                          "type": [
      +                                                            "string",
      +                                                            "null"
      +                                                          ]
      +                                                        },
      +                                                        "projectId": {
      +                                                          "type": [
      +                                                            "string",
      +                                                            "null"
      +                                                          ]
      +                                                        },
      +                                                        "targetFramework": {
      +                                                          "type": [
      +                                                            "string",
      +                                                            "null"
      +                                                          ]
      +                                                        }
      +                                                      },
      +                                                      "type": [
      +                                                        "object",
      +                                                        "null"
      +                                                      ]
      +                                                    }
      +                                                  },
      +                                                  "type": "object"
      +                                                },
      +                                                "range": {
      +                                                  "description": "Zero-based UTF-16 range.",
      +                                                  "properties": {
      +                                                    "length": {
      +                                                      "description": "UTF-16 code-unit length.",
      +                                                      "maximum": 2147483647,
      +                                                      "minimum": 0,
      +                                                      "type": "integer"
      +                                                    },
      +                                                    "start": {
      +                                                      "description": "Zero-based UTF-16 offset.",
      +                                                      "maximum": 2147483647,
      +                                                      "minimum": 0,
      +                                                      "type": "integer"
      +                                                    }
      +                                                  },
      +                                                  "type": "object"
      +                                                }
      +                                              },
      +                                              "required": [
      +                                                "document",
      +                                                "range"
      +                                              ],
      +                                              "type": "object"
      +                                            }
      +                                          },
      +                                          "required": [
      +                                            "span"
      +                                          ],
      +                                          "type": [
      +                                            "object",
      +                                            "null"
      +                                          ]
      +                                        },
      +                                        "snapshot": {
      +                                          "description": "The exact immutable workspace snapshot associated with this location.",
      +                                          "properties": {
      +                                            "snapshotId": {
      +                                              "format": "uuid",
      +                                              "type": "string"
      +                                            },
      +                                            "transactionRevision": {
      +                                              "type": [
      +                                                "integer",
      +                                                "null"
      +                                              ]
      +                                            },
      +                                            "workspaceEpoch": {
      +                                              "type": "integer"
      +                                            },
      +                                            "workspaceId": {
      +                                              "format": "uuid",
      +                                              "type": "string"
      +                                            }
      +                                          },
      +                                          "required": [
      +                                            "workspaceId",
      +                                            "workspaceEpoch",
      +                                            "snapshotId",
      +                                            "transactionRevision"
      +                                          ],
      +                                          "type": "object"
      +                                        },
      +                                        "span": {
      +                                          "description": "The resolved text span.",
      +                                          "properties": {
      +                                            "length": {
      +                                              "description": "UTF-16 code-unit length.",
      +                                              "maximum": 2147483647,
      +                                              "minimum": 0,
      +                                              "type": "integer"
      +                                            },
      +                                            "start": {
      +                                              "description": "Zero-based UTF-16 offset.",
      +                                              "maximum": 2147483647,
      +                                              "minimum": 0,
      +                                              "type": "integer"
      +                                            }
      +                                          },
      +                                          "type": [
      +                                            "object",
      +                                            "null"
      +                                          ]
      +                                        }
      +                                      },
      +                                      "required": [
      +                                        "snapshot"
      +                                      ],
      +                                      "type": [
      +                                        "object",
      +                                        "null"
      +                                      ]
      +                                    }
      +                                  },
      +                                  "required": [
      +                                    "displayName",
      +                                    "kind"
      +                                  ],
      +                                  "type": [
      +                                    "object",
      +                                    "null"
      +                                  ]
      +                                }
      +                              },
      +                              "type": "object"
      +                            },
      +                            "type": [
      +                              "array",
      +                              "null"
      +                            ]
      +                          },
      +                          "totalCount": {
      +                            "description": "Complete result count, when available without additional expensive work.",
      +                            "type": [
      +                              "integer",
      +                              "null"
      +                            ]
      +                          }
      +                        },
      +                        "type": "object"
      +                      },
      +                      "statementCount": {
      +                        "description": "The number of normalized statements in the group.",
      +                        "type": "integer"
      +                      }
      +                    },
      +                    "type": "object"
      +                  },
      +                  "type": [
      +                    "array",
      +                    "null"
      +                  ]
      +                },
      +                "totalCount": {
      +                  "description": "Complete result count, when available without additional expensive work.",
      +                  "type": [
      +                    "integer",
      +                    "null"
      +                  ]
      +                }
      +              },
      +              "type": "object"
      +            }
      +          },
      +          "type": [
      +            "object",
      +            "null"
      +          ]
      +        },
      +        "ok": {
      +          "const": true,
      +          "description": "Whether the tool invocation succeeded."
      +        },
      +        "snapshot": {
      +          "description": "Exact immutable workspace snapshot associated with the result, when available.",
      +          "properties": {
      +            "snapshotId": {
      +              "format": "uuid",
      +              "type": "string"
      +            },
      +            "transactionRevision": {
      +              "type": [
      +                "integer",
      +                "null"
      +              ]
      +            },
      +            "workspaceEpoch": {
      +              "type": "integer"
      +            },
      +            "workspaceId": {
      +              "format": "uuid",
      +              "type": "string"
      +            }
      +          },
      +          "required": [
      +            "workspaceId",
      +            "workspaceEpoch",
      +            "snapshotId",
      +            "transactionRevision"
      +          ],
      +          "type": "object"
      +        },
      +        "warnings": {
      +          "description": "Non-fatal warnings the agent should consider.",
      +          "items": {
      +            "$ref": "#/$defs/warningInfo"
      +          },
      +          "type": "array"
      +        }
      +      },
      +      "required": [
      +        "ok",
      +        "data",
      +        "snapshot"
      +      ],
      +      "type": "object"
      +    },
      +    {
      +      "properties": {
      +        "continuation": {
      +          "description": "Action the agent should take before retrying or continuing.",
      +          "oneOf": [
      +            {
      +              "additionalProperties": false,
      +              "properties": {
      +                "instruction": {
      +                  "description": "Agent-facing instruction explaining how to continue.",
      +                  "minLength": 1,
      +                  "type": "string"
      +                },
      +                "kind": {
      +                  "const": "CallTool",
      +                  "description": "Action required before the original request can continue."
      +                },
      +                "tool": {
      +                  "description": "Tool to call before continuing the original request.",
      +                  "minLength": 1,
      +                  "type": "string"
      +                }
      +              },
      +              "required": [
      +                "kind",
      +                "tool",
      +                "instruction"
      +              ],
      +              "type": "object"
      +            },
      +            {
      +              "additionalProperties": false,
      +              "properties": {
      +                "instruction": {
      +                  "description": "Agent-facing instruction explaining how to continue.",
      +                  "minLength": 1,
      +                  "type": "string"
      +                },
      +                "kind": {
      +                  "const": "ChooseTool",
      +                  "description": "Action required before the original request can continue."
      +                },
      +                "tools": {
      +                  "description": "Allowed tool choices from which the agent must select one.",
      +                  "items": {
      +                    "description": "Name of a tool the agent may choose.",
      +                    "minLength": 1,
      +                    "type": "string"
      +                  },
      +                  "minItems": 1,
      +                  "type": "array",
      +                  "uniqueItems": true
      +                }
      +              },
      +              "required": [
      +                "kind",
      +                "tools",
      +                "instruction"
      +              ],
      +              "type": "object"
      +            },
      +            {
      +              "additionalProperties": false,
      +              "properties": {
      +                "instruction": {
      +                  "description": "Agent-facing instruction explaining how to continue.",
      +                  "minLength": 1,
      +                  "type": "string"
      +                },
      +                "kind": {
      +                  "const": "RetryRequest",
      +                  "description": "Action required before the original request can continue."
      +                }
      +              },
      +              "required": [
      +                "kind",
      +                "instruction"
      +              ],
      +              "type": "object"
      +            },
      +            {
      +              "additionalProperties": false,
      +              "properties": {
      +                "instruction": {
      +                  "description": "Agent-facing instruction explaining how to continue.",
      +                  "minLength": 1,
      +                  "type": "string"
      +                },
      +                "kind": {
      +                  "const": "ReviseRequest",
      +                  "description": "Action required before the original request can continue."
      +                }
      +              },
      +              "required": [
      +                "kind",
      +                "instruction"
      +              ],
      +              "type": "object"
      +            },
      +            {
      +              "additionalProperties": false,
      +              "properties": {
      +                "instruction": {
      +                  "description": "Agent-facing instruction explaining how to continue.",
      +                  "minLength": 1,
      +                  "type": "string"
      +                },
      +                "kind": {
      +                  "const": "ResolveExternally",
      +                  "description": "Action required before the original request can continue."
      +                }
      +              },
      +              "required": [
      +                "kind",
      +                "instruction"
      +              ],
      +              "type": "object"
      +            }
      +          ]
      +        },
      +        "diagnostics": {
      +          "description": "Diagnostics that explain the failed invocation.",
      +          "items": {
      +            "properties": {
      +              "id": {
      +                "description": "The diagnostic identifier.",
      +                "type": "string"
      +              },
      +              "location": {
      +                "description": "The optional source location of the diagnostic.",
      +                "properties": {
      +                  "column": {
      +                    "description": "The one-based column number.",
      +                    "type": "integer"
      +                  },
      +                  "document": {
      +                    "description": "The resolved document.",
      +                    "properties": {
      +                      "documentId": {
      +                        "description": "The document identifier.",
      +                        "type": "string"
      +                      },
      +                      "path": {
      +                        "description": "The normalized document path.",
      +                        "type": "string"
      +                      },
      +                      "projectId": {
      +                        "description": "The owning project identifier.",
      +                        "type": "string"
      +                      }
      +                    },
      +                    "required": [
      +                      "documentId",
      +                      "path",
      +                      "projectId"
      +                    ],
      +                    "type": [
      +                      "object",
      +                      "null"
      +                    ]
      +                  },
      +                  "line": {
      +                    "description": "The one-based line number.",
      +                    "type": "integer"
      +                  },
      +                  "selector": {
      +                    "description": "The canonical selector that can resolve this source location again.",
      +                    "properties": {
      +                      "span": {
      +                        "properties": {
      +                          "document": {
      +                            "description": "Provide exactly one of path or documentId.",
      +                            "properties": {
      +                              "documentId": {
      +                                "description": "Workspace-local document ID.",
      +                                "type": [
      +                                  "string",
      +                                  "null"
      +                                ]
      +                              },
      +                              "path": {
      +                                "description": "Workspace-relative path.",
      +                                "type": [
      +                                  "string",
      +                                  "null"
      +                                ]
      +                              },
      +                              "project": {
      +                                "description": "Disambiguates documents with matching paths or IDs.",
      +                                "properties": {
      +                                  "name": {
      +                                    "type": [
      +                                      "string",
      +                                      "null"
      +                                    ]
      +                                  },
      +                                  "path": {
      +                                    "description": "Workspace-relative path.",
      +                                    "type": [
      +                                      "string",
      +                                      "null"
      +                                    ]
      +                                  },
      +                                  "projectId": {
      +                                    "type": [
      +                                      "string",
      +                                      "null"
      +                                    ]
      +                                  },
      +                                  "targetFramework": {
      +                                    "type": [
      +                                      "string",
      +                                      "null"
      +                                    ]
      +                                  }
      +                                },
      +                                "type": [
      +                                  "object",
      +                                  "null"
      +                                ]
      +                              }
      +                            },
      +                            "type": "object"
      +                          },
      +                          "range": {
      +                            "description": "Zero-based UTF-16 range.",
      +                            "properties": {
      +                              "length": {
      +                                "description": "UTF-16 code-unit length.",
      +                                "maximum": 2147483647,
      +                                "minimum": 0,
      +                                "type": "integer"
      +                              },
      +                              "start": {
      +                                "description": "Zero-based UTF-16 offset.",
      +                                "maximum": 2147483647,
      +                                "minimum": 0,
      +                                "type": "integer"
      +                              }
      +                            },
      +                            "type": "object"
      +                          }
      +                        },
      +                        "required": [
      +                          "document",
      +                          "range"
      +                        ],
      +                        "type": "object"
      +                      }
      +                    },
      +                    "required": [
      +                      "span"
      +                    ],
      +                    "type": [
      +                      "object",
      +                      "null"
      +                    ]
      +                  },
      +                  "snapshot": {
      +                    "description": "The exact immutable workspace snapshot associated with this location.",
      +                    "properties": {
      +                      "snapshotId": {
      +                        "format": "uuid",
      +                        "type": "string"
      +                      },
      +                      "transactionRevision": {
      +                        "type": [
      +                          "integer",
      +                          "null"
      +                        ]
      +                      },
      +                      "workspaceEpoch": {
      +                        "type": "integer"
      +                      },
      +                      "workspaceId": {
      +                        "format": "uuid",
      +                        "type": "string"
      +                      }
      +                    },
      +                    "required": [
      +                      "workspaceId",
      +                      "workspaceEpoch",
      +                      "snapshotId",
      +                      "transactionRevision"
      +                    ],
      +                    "type": "object"
      +                  },
      +                  "span": {
      +                    "description": "The resolved text span.",
      +                    "properties": {
      +                      "length": {
      +                        "description": "UTF-16 code-unit length.",
      +                        "maximum": 2147483647,
      +                        "minimum": 0,
      +                        "type": "integer"
      +                      },
      +                      "start": {
      +                        "description": "Zero-based UTF-16 offset.",
      +                        "maximum": 2147483647,
      +                        "minimum": 0,
      +                        "type": "integer"
      +                      }
      +                    },
      +                    "type": [
      +                      "object",
      +                      "null"
      +                    ]
      +                  }
      +                },
      +                "required": [
      +                  "snapshot"
      +                ],
      +                "type": [
      +                  "object",
      +                  "null"
      +                ]
      +              },
      +              "message": {
      +                "description": "The diagnostic message.",
      +                "type": "string"
      +              },
      +              "severity": {
      +                "description": "The diagnostic severity.",
      +                "enum": [
      +                  "Hidden",
      +                  "Info",
      +                  "Warning",
      +                  "Error"
      +                ],
      +                "type": "string"
      +              }
      +            },
      +            "required": [
      +              "id",
      +              "message"
      +            ],
      +            "type": "object"
      +          },
      +          "type": "array"
      +        },
      +        "error": {
      +          "description": "Structured error details when the invocation failed.",
      +          "properties": {
      +            "code": {
      +              "description": "Stable machine-readable error code.",
      +              "type": "string"
      +            },
      +            "correlationId": {
      +              "description": "Correlation identifier for matching the failure to server-side diagnostics, when available.",
      +              "type": [
      +                "string",
      +                "null"
      +              ]
      +            },
      +            "message": {
      +              "description": "Human-readable explanation of the failure.",
      +              "type": "string"
      +            }
      +          },
      +          "required": [
      +            "code",
      +            "message"
      +          ],
      +          "type": "object"
      +        },
      +        "ok": {
      +          "const": false,
      +          "description": "Whether the tool invocation succeeded."
      +        },
      +        "warnings": {
      +          "description": "Non-fatal warnings the agent should consider.",
      +          "items": {
      +            "$ref": "#/$defs/warningInfo"
      +          },
      +          "type": "array"
      +        }
      +      },
      +      "required": [
      +        "ok",
      +        "error"
      +      ],
      +      "type": "object"
      +    },
      +    {
      +      "properties": {
      +        "diagnostics": {
      +          "description": "Diagnostics that explain the failed invocation.",
      +          "properties": {
      +            "detailsAvailable": {
      +              "const": true
      +            },
      +            "detailsTool": {
      +              "const": "get-error-details"
      +            }
      +          },
      +          "required": [
      +            "detailsAvailable",
      +            "detailsTool"
      +          ],
      +          "type": "object"
      +        },
      +        "error": {
      +          "description": "Structured error details when the invocation failed.",
      +          "properties": {
      +            "code": {
      +              "const": "UnhandledException"
      +            },
      +            "correlationId": {
      +              "format": "uuid",
      +              "type": "string"
      +            },
      +            "message": {
      +              "const": "Tool execution failed."
      +            }
      +          },
      +          "required": [
      +            "code",
      +            "message",
      +            "correlationId"
      +          ],
      +          "type": "object"
      +        },
      +        "ok": {
      +          "const": false,
      +          "description": "Whether the tool invocation succeeded."
      +        },
      +        "reporting": {
      +          "description": "Error-reporting workflow available for an unhandled failure.",
      +          "properties": {
      +            "canPrepare": {
      +              "type": "boolean"
      +            },
      +            "prepareTool": {
      +              "type": [
      +                "string",
      +                "null"
      +              ]
      +            },
      +            "state": {
      +              "enum": [
      +                "Available",
      +                "AlwaysApproved",
      +                "DisabledByConfiguration",
      +                "ApprovalUnavailable"
      +              ],
      +              "type": "string"
      +            }
      +          },
      +          "required": [
      +            "state"
      +          ],
      +          "type": "object"
      +        }
      +      },
      +      "required": [
      +        "ok",
      +        "error",
      +        "diagnostics"
      +      ],
      +      "type": "object"
      +    }
      +  ],
      +  "type": "object"
      +}
  3. First observedv1.0.2

TDQS

A4.6/5.0
Behavior5/5

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

Beyond the readOnly/idempotent annotations, the description discloses enumeration rules (block-bodied methods, constructors, local functions, accessors), the scanning default, and truncation behavior for both groups and per-group occurrences. The instruction to check groups.hasMore and occurrences.hasMore independently is exactly the kind of operational detail annotations cannot carry.

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?

Five tight sentences, front-loaded with purpose before the exclusion note and the return/pagination contract. Dense but nearly every clause carries information; the one mild redundancy is restating the return payload shape (statementCount, symbol pointers, no excerpts) when an output schema already exists.

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 zero-required-parameter, read-only analysis tool with a full output schema and annotations, everything an agent needs is present: what counts as a duplicate, what does not, default scope, default thresholds, and how to page through truncated results.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is already 100%, but the description adds real meaning: minimumStatements counts top-level statements per block (default 3), and the two limit parameters are tied to independent hasMore flags. The scope parameter's fallback to the loaded solution is also clarified. It stops short of describing the scope kind enum values, but the schema handles those.

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?

States a precise verb and resource plus the exact matching rule: groups of whole executable blocks with identical statement text after whitespace normalisation. It immediately bounds the tool with 'this is not semantic clone detection', and 'identifiers and literal values remain significant' lets an agent distinguish it from any fuzzy similarity search among its siblings.

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?

Explicitly frames the purpose as locating duplication candidates for manual inspection, and enumerates what is out of scope (expression bodies, arbitrary statement subsequences). It also states the default scope (loaded solution when scope is omitted). No sibling tool is named as an alternative, keeping this short of a 5.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.