Brain Scanner

graph_read

Read-onlyIdempotent

Access the graph read operations listed below. Compatibility dispatcher; prefer the individually named tool when available. Select operation and its matching payload. Supported operations: analyze_impact, get_graph_scope, get_roots, get_graph_wiki, request_node_explanation, route_agent_task. Effects and required fields depend on that operation.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`payload`	Yes	Arguments for the selected operation. Follow its matching oneOf branch; fields and side effects differ by operation.
`operation`	Yes	Exact operation to dispatch; prefer its individually named tool when available.

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedOct 17, 2026

changedInput schema / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "operation": {
-        "const": "analyze_impact",
-        "type": "string"
-      },
-      "payload": {
-        "additionalProperties": false,
-        "properties": {
-          "cursor": {
-            "maxLength": 512,
-            "type": "string"
-          },
-          "executionId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          },
-          "nodeIds": {
-            "items": {
-              "maxLength": 500,
-              "minLength": 1,
-              "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-              "type": "string"
-            },
-            "maxItems": 100,
-            "type": "array",
-            "uniqueItems": true
-          },
-          "pageSize": {
-            "maximum": 100,
-            "minimum": 1,
-            "type": "integer"
-          },
-          "projectId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          },
-          "sessionId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          }
-        },
-        "required": [
-          "projectId"
-        ],
-        "type": "object"
-      }
-    },
-    "required": [
-      "operation",
-      "payload"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "operation": {
-        "const": "get_graph_scope",
-        "type": "string"
-      },
-      "payload": {
-        "additionalProperties": false,
-        "properties": {
-          "cursor": {
-            "maxLength": 512,
-            "type": "string"
-          },
-          "executionId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          },
-          "nodeId": {
-            "maxLength": 500,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          },
-          "pageSize": {
-            "maximum": 100,
-            "minimum": 1,
-            "type": "integer"
-          },
-          "projectId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          },
-          "sessionId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          }
-        },
-        "required": [
-          "projectId",
-          "nodeId"
-        ],
-        "type": "object"
-      }
-    },
-    "required": [
-      "operation",
-      "payload"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "operation": {
-        "const": "get_roots",
-        "type": "string"
-      },
-      "payload": {
-        "additionalProperties": false,
-        "properties": {
-          "cursor": {
-            "maxLength": 512,
-            "type": "string"
-          },
-          "pageSize": {
-            "maximum": 100,
-            "minimum": 1,
-            "type": "integer"
-          },
-          "projectId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          },
-          "sessionId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          }
-        },
-        "required": [
-          "projectId"
-        ],
-        "type": "object"
-      }
-    },
-    "required": [
-      "operation",
-      "payload"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "operation": {
-        "const": "get_graph_wiki",
-        "type": "string"
-      },
-      "payload": {
-        "additionalProperties": false,
-        "properties": {
-          "executionId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          },
-          "nodeId": {
-            "maxLength": 500,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          },
-          "projectId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          },
-          "sessionId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          }
-        },
-        "required": [
-          "projectId",
-          "nodeId"
-        ],
-        "type": "object"
-      }
-    },
-    "required": [
-      "operation",
-      "payload"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "operation": {
-        "const": "request_node_explanation",
-        "type": "string"
-      },
-      "payload": {
-        "additionalProperties": false,
-        "properties": {
-          "executionId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          },
-          "nodeId": {
-            "maxLength": 500,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          },
-          "projectId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          },
-          "sessionId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          }
-        },
-        "required": [
-          "projectId",
-          "nodeId"
-        ],
-        "type": "object"
-      }
-    },
-    "required": [
-      "operation",
-      "payload"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "operation": {
-        "const": "route_agent_task",
-        "type": "string"
-      },
-      "payload": {
-        "additionalProperties": false,
-        "properties": {
-          "executionId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          },
-          "nodeIds": {
-            "items": {
-              "maxLength": 500,
-              "minLength": 1,
-              "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-              "type": "string"
-            },
-            "maxItems": 100,
-            "type": "array",
-            "uniqueItems": true
-          },
-          "projectId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          },
-          "sessionId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
-            "type": "string"
-          }
-        },
-        "required": [
-          "projectId"
-        ],
-        "type": "object"
-      }
-    },
-    "required": [
-      "operation",
-      "payload"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "operation": {
+        "const": "analyze_impact",
+        "description": "Select this exact operation; payload must match this branch.",
+        "type": "string"
+      },
+      "payload": {
+        "additionalProperties": false,
+        "properties": {
+          "cursor": {
+            "description": "Opaque nextCursor from the preceding page of this same query. Omit for the first page; do not construct or reuse across projects.",
+            "maxLength": 512,
+            "type": "string"
+          },
+          "executionId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          },
+          "nodeIds": {
+            "description": "Selected node IDs from this project's published graph, not file paths or nodes from another project.",
+            "items": {
+              "maxLength": 500,
+              "minLength": 1,
+              "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+              "type": "string"
+            },
+            "maxItems": 100,
+            "type": "array",
+            "uniqueItems": true
+          },
+          "pageSize": {
+            "description": "Maximum items requested per page, within the schema limits. Continue with the returned nextCursor when present.",
+            "maximum": 100,
+            "minimum": 1,
+            "type": "integer"
+          },
+          "projectId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          },
+          "sessionId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          }
+        },
+        "required": [
+          "projectId"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "operation",
+      "payload"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "operation": {
+        "const": "get_graph_scope",
+        "description": "Select this exact operation; payload must match this branch.",
+        "type": "string"
+      },
+      "payload": {
+        "additionalProperties": false,
+        "properties": {
+          "cursor": {
+            "description": "Opaque nextCursor from the preceding page of this same query. Omit for the first page; do not construct or reuse across projects.",
+            "maxLength": 512,
+            "type": "string"
+          },
+          "executionId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          },
+          "nodeId": {
+            "description": "Target node ID from this project's published graph; use get_roots and get_graph_scope to discover nodes. Not a file path.",
+            "maxLength": 500,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          },
+          "pageSize": {
+            "description": "Maximum items requested per page, within the schema limits. Continue with the returned nextCursor when present.",
+            "maximum": 100,
+            "minimum": 1,
+            "type": "integer"
+          },
+          "projectId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          },
+          "sessionId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          }
+        },
+        "required": [
+          "projectId",
+          "nodeId"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "operation",
+      "payload"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "operation": {
+        "const": "get_roots",
+        "description": "Select this exact operation; payload must match this branch.",
+        "type": "string"
+      },
+      "payload": {
+        "additionalProperties": false,
+        "properties": {
+          "cursor": {
+            "description": "Opaque nextCursor from the preceding page of this same query. Omit for the first page; do not construct or reuse across projects.",
+            "maxLength": 512,
+            "type": "string"
+          },
+          "pageSize": {
+            "description": "Maximum items requested per page, within the schema limits. Continue with the returned nextCursor when present.",
+            "maximum": 100,
+            "minimum": 1,
+            "type": "integer"
+          },
+          "projectId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          },
+          "sessionId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          }
+        },
+        "required": [
+          "projectId"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "operation",
+      "payload"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "operation": {
+        "const": "get_graph_wiki",
+        "description": "Select this exact operation; payload must match this branch.",
+        "type": "string"
+      },
+      "payload": {
+        "additionalProperties": false,
+        "properties": {
+          "executionId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          },
+          "nodeId": {
+            "description": "Target node ID from this project's published graph; use get_roots and get_graph_scope to discover nodes. Not a file path.",
+            "maxLength": 500,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          },
+          "projectId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          },
+          "sessionId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          }
+        },
+        "required": [
+          "projectId",
+          "nodeId"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "operation",
+      "payload"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "operation": {
+        "const": "request_node_explanation",
+        "description": "Select this exact operation; payload must match this branch.",
+        "type": "string"
+      },
+      "payload": {
+        "additionalProperties": false,
+        "properties": {
+          "executionId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          },
+          "nodeId": {
+            "description": "Target node ID from this project's published graph; use get_roots and get_graph_scope to discover nodes. Not a file path.",
+            "maxLength": 500,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          },
+          "projectId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          },
+          "sessionId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          }
+        },
+        "required": [
+          "projectId",
+          "nodeId"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "operation",
+      "payload"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "operation": {
+        "const": "route_agent_task",
+        "description": "Select this exact operation; payload must match this branch.",
+        "type": "string"
+      },
+      "payload": {
+        "additionalProperties": false,
+        "properties": {
+          "executionId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          },
+          "nodeIds": {
+            "description": "Selected node IDs from this project's published graph, not file paths or nodes from another project.",
+            "items": {
+              "maxLength": 500,
+              "minLength": 1,
+              "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+              "type": "string"
+            },
+            "maxItems": 100,
+            "type": "array",
+            "uniqueItems": true
+          },
+          "projectId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          },
+          "sessionId": {
+            "description": "Owned project ID returned by list_linked_projects or map_project; do not use a local path or repository URL.",
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[A-Za-z0-9][A-Za-z0-9._:@+~-]*$",
+            "type": "string"
+          }
+        },
+        "required": [
+          "projectId"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "operation",
+      "payload"
+    ],
+    "type": "object"
+  }
+]

addedInput schema / properties / operation / description

Added value: +"Exact operation to dispatch; prefer its individually named tool when available."

addedInput schema / properties / payload / description

Added value: +"Arguments for the selected operation. Follow its matching oneOf branch; fields and side effects differ by operation."

First observedSep 17, 2026

TDQS

A3.6/5.0

Behavior3/5

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds only the vague 'Effects and required fields depend on that operation', which hints at variation between branches without disclosing what any effect is. Given the annotation coverage, a 3 is appropriate, but the line about varying effects sits uneasily with a blanket read-only hint.

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 the core purpose, then the dispatcher caveat, then the operation list. No filler sentences. The listing of six operations is the only bulk, and it is necessary, though each could have been annotated with a short gloss.

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?

For a six-way dispatcher with nested payload objects and no output schema, the description omits what each sub-operation returns or does. It partially compensates by telling the agent to prefer the individually named tools, which presumably carry that detail. Still, an agent must go elsewhere to decide between analyze_impact and get_graph_wiki.

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% and the schema itself spells out that payload must match the selected oneOf branch, so the structured data carries the burden. The description reinforces operation/payload pairing but adds no syntax, format, or field-level meaning beyond the schema. Baseline 3 is correct.

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

Purpose4/5

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

The description names a specific verb and resource ('Access the graph read operations') and explicitly lists the six supported operations, so an agent knows this is a dispatcher over graph reads. It also distinguishes itself from siblings by calling itself a 'Compatibility dispatcher'. It stops short of a 5 because it never states what any individual operation actually does.

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

Usage Guidelines4/5

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

'prefer the individually named tool when available' gives explicit, actionable routing guidance toward the alternatives. It also instructs the agent to select the operation and matching payload. What's missing is per-operation context for choosing among analyze_impact, get_graph_scope, get_roots, etc.

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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