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Analyze Control Flow

analyze-control-flow
Read-onlyIdempotent

Analyze entry and exit reachability, exit points, and return statements for an exact statement or contiguous sibling statements in one executable body.

Instructions

Analyses entry and exit reachability, exit points and return statements for an exact complete statement or contiguous sibling statements in one executable body. Use this to understand a selected region; use get-control-flow-graph for the enclosing executable graph, or analyze-data-flow for variable-flow information. The selection must match statement spans exactly; a caret or partial statement is rejected. Echo the current expectedSnapshot. Exit points and return statements are limited independently to 100 each by default; check exits.hasMore and returns.hasMore.

Input Schema

NameRequiredDescriptionDefault
locationYesAn exact complete statement or contiguous statement range to analyze.
workspaceNoProvide workspaceId, alias, path, or any combination.
exitsLimitNoMaximum number of exit points to return.
returnsLimitNoMaximum number of return statements to return.
expectedSnapshotNoEcho the snapshot returned with the data or transaction state used to construct this request.

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed7 schema fields changedv1.0.5
    • addedInput schema / $defs
      Added value: +{
      +  "document": {
      +    "properties": {
      +      "documentId": {
      +        "description": "Workspace-local document ID.",
      +        "type": "string"
      +      },
      +      "path": {
      +        "description": "Workspace-relative path.",
      +        "type": "string"
      +      },
      +      "project": {
      +        "description": "Disambiguates documents with matching paths or IDs.",
      +        "properties": {
      +          "name": {
      +            "type": "string"
      +          },
      +          "path": {
      +            "description": "Workspace-relative path.",
      +            "type": "string"
      +          },
      +          "projectId": {
      +            "type": "string"
      +          },
      +          "targetFramework": {
      +            "type": "string"
      +          }
      +        },
      +        "type": [
      +          "object",
      +          "null"
      +        ]
      +      }
      +    },
      +    "type": "object"
      +  }
      +}
    • addedInput schema / properties / location / properties / selection / properties / document / $ref
      Added value: +"#/$defs/document"
    • removedInput schema / properties / location / properties / selection / properties / document / properties
      Removed value: -{
      -  "documentId": {
      -    "description": "Workspace-local document ID.",
      -    "type": "string"
      -  },
      -  "path": {
      -    "description": "Workspace-relative path.",
      -    "type": "string"
      -  },
      -  "project": {
      -    "$ref": "#/properties/location/properties/span/properties/document/properties/project",
      -    "description": "Disambiguates documents with matching paths or IDs."
      -  }
      -}
    • removedInput schema / properties / location / properties / selection / properties / document / type
      Removed value: -"object"
    • addedInput schema / properties / location / properties / span / properties / document / $ref
      Added value: +"#/$defs/document"
    • removedInput schema / properties / location / properties / span / properties / document / properties
      Removed value: -{
      -  "documentId": {
      -    "description": "Workspace-local document ID.",
      -    "type": "string"
      -  },
      -  "path": {
      -    "description": "Workspace-relative path.",
      -    "type": "string"
      -  },
      -  "project": {
      -    "description": "Disambiguates documents with matching paths or IDs.",
      -    "properties": {
      -      "name": {
      -        "type": "string"
      -      },
      -      "path": {
      -        "description": "Workspace-relative path.",
      -        "type": "string"
      -      },
      -      "projectId": {
      -        "type": "string"
      -      },
      -      "targetFramework": {
      -        "type": "string"
      -      }
      -    },
      -    "type": [
      -      "object",
      -      "null"
      -    ]
      -  }
      -}
    • removedInput schema / properties / location / properties / span / properties / document / type
      Removed value: -"object"
  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": {
      +            "entryReachable": {
      +              "description": "Whether the region entry is reachable.",
      +              "type": "boolean"
      +            },
      +            "exitReachable": {
      +              "description": "Whether the region exit is reachable.",
      +              "type": "boolean"
      +            },
      +            "exits": {
      +              "description": "The projected exit points.",
      +              "properties": {
      +                "hasMore": {
      +                  "description": "Whether additional items were available beyond this page.",
      +                  "type": "boolean"
      +                },
      +                "items": {
      +                  "description": "Items returned in this page.",
      +                  "items": {
      +                    "properties": {
      +                      "kind": {
      +                        "description": "The exit kind.",
      +                        "type": "string"
      +                      },
      +                      "location": {
      +                        "description": "The exit location, when available.",
      +                        "properties": {
      +                          "column": {
      +                            "description": "The one-based column number.",
      +                            "type": "integer"
      +                          },
      +                          "document": {
      +                            "$ref": "#/properties/request/properties/value/properties/region/properties/document",
      +                            "description": "The resolved document."
      +                          },
      +                          "line": {
      +                            "description": "The one-based line number.",
      +                            "type": "integer"
      +                          },
      +                          "selector": {
      +                            "$ref": "#/properties/request/properties/value/properties/region/properties/selector",
      +                            "description": "The canonical selector that can resolve this source location again."
      +                          },
      +                          "snapshot": {
      +                            "$ref": "#/properties/request/properties/value/properties/region/properties/snapshot",
      +                            "description": "The exact immutable workspace snapshot associated with this location."
      +                          },
      +                          "span": {
      +                            "$ref": "#/properties/request/properties/value/properties/region/properties/span",
      +                            "description": "The resolved text span."
      +                          }
      +                        },
      +                        "required": [
      +                          "snapshot"
      +                        ],
      +                        "type": [
      +                          "object",
      +                          "null"
      +                        ]
      +                      }
      +                    },
      +                    "required": [
      +                      "kind"
      +                    ],
      +                    "type": "object"
      +                  },
      +                  "type": [
      +                    "array",
      +                    "null"
      +                  ]
      +                },
      +                "totalCount": {
      +                  "description": "Complete result count, when available without additional expensive work.",
      +                  "type": [
      +                    "integer",
      +                    "null"
      +                  ]
      +                }
      +              },
      +              "type": "object"
      +            },
      +            "region": {
      +              "description": "The analyzed region.",
      +              "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"
      +              ]
      +            },
      +            "returns": {
      +              "description": "The projected return statements.",
      +              "properties": {
      +                "hasMore": {
      +                  "description": "Whether additional items were available beyond this page.",
      +                  "type": "boolean"
      +                },
      +                "items": {
      +                  "description": "Items returned in this page.",
      +                  "items": {
      +                    "properties": {
      +                      "column": {
      +                        "description": "The one-based column number.",
      +                        "type": "integer"
      +                      },
      +                      "document": {
      +                        "$ref": "#/properties/request/properties/value/properties/region/properties/document",
      +                        "description": "The resolved document."
      +                      },
      +                      "line": {
      +                        "description": "The one-based line number.",
      +                        "type": "integer"
      +                      },
      +                      "selector": {
      +                        "$ref": "#/properties/request/properties/value/properties/region/properties/selector",
      +                        "description": "The canonical selector that can resolve this source location again."
      +                      },
      +                      "snapshot": {
      +                        "$ref": "#/properties/request/properties/value/properties/region/properties/snapshot",
      +                        "description": "The exact immutable workspace snapshot associated with this location."
      +                      },
      +                      "span": {
      +                        "$ref": "#/properties/request/properties/value/properties/region/properties/span",
      +                        "description": "The resolved text span."
      +                      }
      +                    },
      +                    "required": [
      +                      "snapshot"
      +                    ],
      +                    "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

A4.4/5.0
Behavior4/5

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

Annotations already declare readOnly/idempotent/non-destructive, and the description still adds real behavior: strict selection validation that causes rejection, the requirement to echo expectedSnapshot for concurrency correctness, and independent truncation of exits and returns at 100 with hasMore flags to check. That is more than the annotations convey, though it does not describe error surfacing when the snapshot is stale.

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?

Front-loaded with purpose, then alternatives, then the validation constraint, then snapshot and limits — a sensible ordering with no filler. It is dense and slightly packed (multiple constraints per sentence), but every sentence carries operational information.

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

Completeness5/5

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

For a 5-parameter, nested-schema, read-only analysis tool with an output schema, the description covers what an agent needs before calling: scope semantics, sibling routing, the exact-match precondition, snapshot echoing, and truncation behavior. Return-value shape is correctly left to the output schema.

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 coverage is 100% and the schema already documents the exact-statement requirement, the expectedSnapshot echo, and the 100-item defaults for exitsLimit/returnsLimit, so the description mostly restates structured data. The only genuine addition is pointing at the exits.hasMore/returns.hasMore output flags, which is output-side rather than parameter meaning — baseline 3 applies.

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

Purpose5/5

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

States a specific verb and resource ('Analyses entry and exit reachability, exit points and return statements') plus the exact scope ('an exact complete statement or contiguous sibling statements in one executable body'). It explicitly distinguishes itself from get-control-flow-graph (enclosing graph) and analyze-data-flow (variable flow), so an agent can pick it without opening any schema.

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?

Gives explicit when-to-use ('use this to understand a selected region') and names two alternatives with the conditions that select them. It also states a hard precondition — the selection must match statement spans exactly and a caret or partial statement is rejected — which is exactly the kind of guidance that prevents wasted calls.

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