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Read-onlyIdempotent

Find source or metadata definitions for a resolved symbol to see where it is declared or implemented.

Instructions

Finds source or metadata definitions for a resolved symbol.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
symbolYesThe symbol selector.
workspaceNoProvide workspaceId, alias, path, or any combination.
definitionsLimitNoMaximum number of definitions to return.
expectedSnapshotNoEcho the snapshot returned with the data or transaction state used to construct this request.

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": {
      +            "definitions": {
      +              "description": "The resolved definitions.",
      +              "properties": {
      +                "hasMore": {
      +                  "description": "Whether additional items were available beyond this page.",
      +                  "type": "boolean"
      +                },
      +                "items": {
      +                  "description": "Items returned in this page.",
      +                  "items": {
      +                    "properties": {
      +                      "containingAssembly": {
      +                        "description": "The containing assembly display name, when available.",
      +                        "type": [
      +                          "string",
      +                          "null"
      +                        ]
      +                      },
      +                      "isMetadata": {
      +                        "description": "Whether the definition is metadata-only.",
      +                        "type": "boolean"
      +                      },
      +                      "location": {
      +                        "description": "The source location, when the definition is in source.",
      +                        "properties": {
      +                          "column": {
      +                            "description": "The one-based column number.",
      +                            "type": "integer"
      +                          },
      +                          "document": {
      +                            "$ref": "#/properties/request/properties/value/properties/symbol/properties/location/properties/document",
      +                            "description": "The resolved document."
      +                          },
      +                          "line": {
      +                            "description": "The one-based line number.",
      +                            "type": "integer"
      +                          },
      +                          "selector": {
      +                            "$ref": "#/properties/request/properties/value/properties/symbol/properties/location/properties/selector",
      +                            "description": "The canonical selector that can resolve this source location again."
      +                          },
      +                          "snapshot": {
      +                            "$ref": "#/properties/request/properties/value/properties/symbol/properties/location/properties/snapshot",
      +                            "description": "The exact immutable workspace snapshot associated with this location."
      +                          },
      +                          "span": {
      +                            "$ref": "#/properties/request/properties/value/properties/symbol/properties/location/properties/span",
      +                            "description": "The resolved text span."
      +                          }
      +                        },
      +                        "required": [
      +                          "snapshot"
      +                        ],
      +                        "type": [
      +                          "object",
      +                          "null"
      +                        ]
      +                      },
      +                      "metadataName": {
      +                        "description": "The metadata symbol name, when the definition is metadata-only.",
      +                        "type": [
      +                          "string",
      +                          "null"
      +                        ]
      +                      }
      +                    },
      +                    "type": "object"
      +                  },
      +                  "type": [
      +                    "array",
      +                    "null"
      +                  ]
      +                },
      +                "totalCount": {
      +                  "description": "Complete result count, when available without additional expensive work.",
      +                  "type": [
      +                    "integer",
      +                    "null"
      +                  ]
      +                }
      +              },
      +              "type": "object"
      +            },
      +            "symbol": {
      +              "description": "The queried 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",
      +            "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. First observedv1.0.2

TDQS

A3.5/5.0
Behavior3/5

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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered without description help. The description adds only the "source or metadata" scope nuance; it says nothing about the definitionsLimit cap (default 32) or the expectedSnapshot echo semantics that the schema exposes, so it adds little behavioral value beyond annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

One sentence, front-loaded with the verb and result type, and every clause (source vs metadata, resolved symbol) earns its place. No filler or restatement of the title.

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 explained, and annotations cover safety, but for a tool with a 4-parameter nested selector and a snapshot-guard argument the description gives no routing context or precondition clarity beyond "resolved symbol". It is minimally sufficient for invocation but thin for a tool this structurally complex.

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% on a deeply nested selector (symbol/location span-or-selection, workspace, definitionsLimit, expectedSnapshot), so the schema carries parameter meaning fully. The description contributes nothing about which selector form to use or how the workspace/snapshot arguments interact, so the baseline 3 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?

Specific verb+resource: "Finds ... definitions" for a "resolved symbol", and it scopes the result to "source or metadata definitions" which distinguishes it from find-references (usages) and get-symbol-info (metadata only). It does not name any sibling, so the differentiation is implicit rather than explicit.

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

Usage Guidelines3/5

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

The phrase "for a resolved symbol" implies a precondition (the symbol must already be resolved, e.g. via resolve-symbol) and therefore implies usage, but no when/when-not or alternatives (find-references, find-implementations, get-symbol-info) are stated. Guidance is inferable, not stated.

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