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Find Derived Types

find-derived-types
Read-onlyIdempotent

Find C# types that derive from a resolved base type across a solution, project, or document to support inheritance and impact analysis in Roslyn Workbench MCP.

Instructions

Finds derived types for a resolved base type.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
scopeNoSelects projects to search; a document scope searches its containing project. Omitted searches the loaded solution.
symbolYesProvide exactly one of location or documentationCommentId.
maxDepthNoMaximum traversal depth; directly derived types are at depth one.
workspaceNoProvide workspaceId, alias, path, or any combination.
expectedSnapshotNoEcho the snapshot returned with the data or transaction state used to construct this request.
derivedTypesLimitNoCaps returned derived types within maxDepth. Omitted or null uses 100; zero returns no derived types.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. 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": {
+            "baseType": {
+              "description": "The queried base type.",
+              "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"
+              ]
+            },
+            "derivedTypes": {
+              "description": "The resolved derived types.",
+              "properties": {
+                "hasMore": {
+                  "description": "Whether additional items were available beyond this page.",
+                  "type": "boolean"
+                },
+                "items": {
+                  "description": "Items returned in this page.",
+                  "items": {
+                    "properties": {
+                      "depth": {
+                        "description": "The zero-based depth from the queried root type.",
+                        "type": "integer"
+                      },
+                      "derivedTypes": {
+                        "description": "The nested derived types for this node.",
+                        "items": {
+                          "$ref": "#/properties/request/properties/value/properties/derivedTypes/properties/items/items"
+                        },
+                        "type": "array"
+                      },
+                      "type": {
+                        "description": "The resolved type 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": {
+                            "$ref": "#/properties/request/properties/value/properties/baseType/properties/location",
+                            "description": "The optional source location of the symbol."
+                          }
+                        },
+                        "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"
+            }
+          },
+          "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"
+}
  2. Changed2 schema fields changedv1.0.3
    • addedInput schema / properties / derivedTypesLimit / description
      Added value: +"Caps returned derived types within maxDepth. Omitted or null uses 100; zero returns no derived types."
    • addedInput schema / properties / scope / description
      Added value: +"Selects projects to search; a document scope searches its containing project. Omitted searches the loaded solution."
  3. First observedv1.0.2

TDQS

C2.2/5.0
Behavior2/5

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

Annotations declare readOnlyHint, idempotentHint, non-destructive, and closed-world, so the safety profile is covered. However, the description adds nothing about traversal behavior, ordering of results, or how depth/limit interact — context that matters for a graph-traversal tool. The word 'resolved' hints that the input must be a resolved symbol but is never explained.

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 short sentence, front-loaded and without filler. It is concise, though its brevity reflects under-specification rather than disciplined editing.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given a 6-parameter tool with heavy nested objects, graph-traversal semantics, and 47 sibling tools, a one-sentence description is inadequate. It omits how 'resolved base type' input is obtained, what 'derived types' includes, and how this differs from overlapping siblings such as find-implementations.

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

Parameters3/5

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

Schema description coverage is 100%, so the schema fully documents the complex nested parameters (scope, symbol, maxDepth, derivedTypesLimit, expectedSnapshot). The description contributes nothing beyond that, which is the baseline case when the schema does the heavy lifting.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose2/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description 'Finds derived types for a resolved base type' restates the tool name almost verbatim without adding specificity. It doesn't distinguish this from closely related siblings like find-implementations, get-type-hierarchy, or find-overrides, all of which operate on type relationships.

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

Usage Guidelines1/5

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

No guidance on when to use this tool versus find-implementations, get-type-hierarchy, or find-overrides, which are the obvious alternatives for type-relationship queries. The agent is left to guess from the name alone.

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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