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Find Unused Symbols

find-unused-symbols
Read-onlyIdempotent

Identify potentially removable unused local variables and private members via compiler diagnostics, then verify references before deleting code.

Instructions

Uses only compiler diagnostics CS0168, CS0169 and CS0219 to identify candidate unused symbols. Use this to review potentially removable locals and private members; inspect find-references before removing code, or get-diagnostics for the underlying warnings. includeInternal widens the accessibility filter; generated-looking documents are excluded by default. Searches the selected scope, or the loaded solution when scope is omitted. Returns up to 50 candidates by default; check candidates.hasMore before treating the candidate list as complete.

Input Schema

NameRequiredDescriptionDefault
scopeNoThe optional search scope.
workspaceNoProvide workspaceId, alias, path, or any combination.
candidatesLimitNoMaximum number of results to return.
includeInternalNoWhether internal members should be included.
excludeGeneratedNoWhether generated files should be excluded.

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: +{
      +  "$defs": {
      +    "warningInfo": {
      +      "properties": {
      +        "code": {
      +          "description": "The stable machine-readable warning code.",
      +          "type": "string"
      +        },
      +        "message": {
      +          "description": "The human-readable warning message.",
      +          "type": "string"
      +        }
      +      },
      +      "required": [
      +        "code",
      +        "message"
      +      ],
      +      "type": "object"
      +    }
      +  },
      +  "oneOf": [
      +    {
      +      "properties": {
      +        "data": {
      +          "description": "Tool-specific result payload.",
      +          "properties": {
      +            "candidates": {
      +              "description": "The returned unused symbol candidates.",
      +              "properties": {
      +                "hasMore": {
      +                  "description": "Whether additional items were available beyond this page.",
      +                  "type": "boolean"
      +                },
      +                "items": {
      +                  "description": "Items returned in this page.",
      +                  "items": {
      +                    "properties": {
      +                      "confidence": {
      +                        "description": "The confidence label for the candidate.",
      +                        "type": "string"
      +                      },
      +                      "location": {
      +                        "description": "The source location for the candidate.",
      +                        "properties": {
      +                          "column": {
      +                            "description": "The one-based column number.",
      +                            "type": "integer"
      +                          },
      +                          "document": {
      +                            "$ref": "#/properties/request/properties/value/properties/candidates/properties/items/items/properties/symbol/properties/location/properties/document",
      +                            "description": "The resolved document."
      +                          },
      +                          "line": {
      +                            "description": "The one-based line number.",
      +                            "type": "integer"
      +                          },
      +                          "selector": {
      +                            "$ref": "#/properties/request/properties/value/properties/candidates/properties/items/items/properties/symbol/properties/location/properties/selector",
      +                            "description": "The canonical selector that can resolve this source location again."
      +                          },
      +                          "snapshot": {
      +                            "$ref": "#/properties/request/properties/value/properties/candidates/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/candidates/properties/items/items/properties/symbol/properties/location/properties/span",
      +                            "description": "The resolved text span."
      +                          }
      +                        },
      +                        "required": [
      +                          "snapshot"
      +                        ],
      +                        "type": [
      +                          "object",
      +                          "null"
      +                        ]
      +                      },
      +                      "reasons": {
      +                        "description": "The reasons the symbol was reported.",
      +                        "items": {
      +                          "type": "string"
      +                        },
      +                        "type": "array"
      +                      },
      +                      "symbol": {
      +                        "description": "The candidate 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"
      +                        ]
      +                      }
      +                    },
      +                    "required": [
      +                      "confidence"
      +                    ],
      +                    "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

A4.8/5.0
Behavior5/5

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

The annotations already say the tool is readOnly, idempotent, non-destructive, and closed-world. The description adds meaningful behavior beyond them: candidates are based only on three diagnostics, generated-looking documents are excluded by default, includeInternal widens the accessibility filter, scope defaults to the loaded solution, and the result is capped at 50 by default. The warning to check candidates.hasMore is a critical completeness caveat.

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 front-loaded with the core method and scope, then moves efficiently into usage warnings and parameter defaults. It is dense but not wasteful; every sentence carries operational value, though it could be split for easier scanning.

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?

Given that an output schema exists and annotations cover safety traits, the description supplies everything an agent needs for correct invocation: diagnostic basis, scope default, generated/internal filtering, result limit, and the hasMore caveat. Nothing material is missing.

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 description coverage is 100%, so the schema itself handles the basics. The description still adds useful semantics that the schema does not state clearly: includeInternal widens the accessibility filter, generated documents are excluded by default, scope falls back to the loaded solution when omitted, and candidatesLimit defaults to 50 with a hasMore indicator. These are real clarifications beyond the schema's terse parameter descriptions.

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?

The description states a specific verb and resource ('identify candidate unused symbols') and grounds it in exact compiler diagnostics (CS0168, CS0169, CS0219). It clearly distinguishes itself from siblings by naming find-references and get-diagnostics as related but separate operations.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It explicitly says when to use this tool ('review potentially removable locals and private members') and directs the agent to alternatives before acting: inspect find-references before removing code, or get-diagnostics for the underlying warnings. This is explicit when/when-not and alternative routing.

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