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Find Duplicate Code

find-duplicate-code

Read-onlyIdempotent

Locate duplicate C# executable blocks across a solution, project, or document by matching normalized statement sequences.

Instructions

Returns bounded duplicate executable-block pointers that normalize to the same statement sequence.

Input Schema

TableJSON Schema

Name	Required	Description
`scope`	No	The optional search scope.
`workspace`	No	Provide workspaceId, alias, path, or any combination.
`groupsLimit`	No	Maximum number of results to return.
`minimumStatements`	No	The minimum statement count to consider.
`occurrencesPerGroupLimit`	No	Maximum number of occurrences to return for each duplicate group.

Output Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedv1.0.4Oct 15, 2026

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"
+}

First observedv1.0.2Oct 15, 2026

TDQS

B3.2/5.0

Behavior3/5

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

Annotations already declare readOnly=true, idempotent=true, destructive=false, so the safety profile is fully covered. The description adds one genuinely useful behavioral fact — that duplication is semantic (normalized statement sequence), not textual — plus the notion that results are 'bounded'. However it omits grouping behavior, ordering, and truncation semantics, so it adds only moderate context.

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?

A single front-loaded sentence with no filler or repetition. It is efficient, though for a five-parameter analysis tool with an elaborate scope hierarchy the complete absence of any second sentence makes it feel under-specified rather than truly concise.

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 described, and the schema fully documents parameters. Still, the description omits the default scope (Solution), the meaning of minimumStatements and the limit parameters, and any cue about when this analysis is the right call versus the many other analysis siblings — leaving meaningful interpretive gaps for a complex tool.

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 scope, workspace, groupsLimit, minimumStatements and occurrencesPerGroupLimit are all documented in the schema. The description contributes nothing about parameter meaning (it never mentions scoping, statement thresholds, or limits), so the baseline 3 for fully-covered schemas applies.

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: it returns duplicate code blocks matched by normalized statement sequences. The 'executable-block / normalize to the same statement sequence' phrasing is dense jargon but does pinpoint exactly what class of duplicates is found, which no sibling tool covers. It stops short of naming or contrasting any sibling, keeping it out of 5 territory.

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, no mention of alternatives, and no indication of prerequisites or when results would be empty. An agent must infer from the tool name alone that this is the duplicate-detection entry point rather than, say, find-unused-symbols or get-dependency-graph.

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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