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codex-in-claude

by briandconnelly
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
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List server capabilities (free)

codex_capabilities
Read-only

List server tools, tiers, and result fingerprint with configurable detail, enabling client caching and optional schema embedding for resource-blind clients.

Instructions

Deprecated: use amicus_capabilities. List this server's tools, tiers, and the result fingerprint. Free — no model call. Clients can cache by the fingerprint.

detail="summary" (default) returns each tool's name, cost, stability, error_codes, and deprecation marker — the facts tools/list does not already carry — plus async_lifecycle, but only for the *_async tools. detail="full" adds use_when/returns/required_params/key_optional_params, restating what you already hold. detail="contracts" omits tool_details.

Pass include_schemas to also embed the full 'error-envelope', 'result-meta', 'capabilities-result', and/or 'status-result' schema, and/or the 'parameter-contracts' document (a contract doc, not a JSON Schema) — a tool-reachable fallback to the codex:// resources for resource-blind clients. It works in any detail mode.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
detailNoWhat to return: 'summary' (default) returns each tool's name, cost, stability, error_codes, and deprecation marker; the *_async tools also get async_lifecycle. 'full' adds use_when, returns, and the parameter lists (which tools/list already carries). 'contracts' drops tool_details: fetch a schema, or recheck fingerprint, without re-paying for the inventory.summary
include_schemasNoOpt-in tool-reachable fallback for resource-blind clients: also embed the full 'error-envelope', 'result-meta', 'capabilities-result', and/or 'status-result' schema, and/or the 'parameter-contracts' document (a contract doc, not a JSON Schema, sourced from the codex://params resource body), in the response — the default payload omits them and points at the codex:// resources instead.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
okYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv0.24.0
    • changedInput schema / properties / detail / description
      Previous value: -"What to return: 'summary' (default) returns each tool's name, cost, stability, and error_codes; the *_async tools also get async_lifecycle. 'full' adds use_when, returns, and the parameter lists (which tools/list already carries). 'contracts' drops tool_details: fetch a schema, or recheck fingerprint, without re-paying for the inventory."New value: +"What to return: 'summary' (default) returns each tool's name, cost, stability, error_codes, and deprecation marker; the *_async tools also get async_lifecycle. 'full' adds use_when, returns, and the parameter lists (which tools/list already carries). 'contracts' drops tool_details: fetch a schema, or recheck fingerprint, without re-paying for the inventory."
  2. Changed1 schema field changedv0.22.0
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "active_tools": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "annotations_reading": {
-        "type": "string"
-      },
-      "deprecation_policy": {
-        "type": "string"
-      },
-      "error_envelope_resource": {
-        "type": "string"
-      },
-      "fingerprint": {
-        "type": "string"
-      },
-      "fingerprint_covers": {
-        "description": "A contract-semantic change in any listed category changes the fingerprint; nothing outside them does. Release identity is excluded: serverInfo.version, version, server_version change every release WITHOUT moving the fingerprint.",
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "free_tools": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "name": {
-        "type": "string"
-      },
-      "negative_scope": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "ok": {
-        "const": true,
-        "type": "boolean"
-      },
-      "prerequisites": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "protocol_revision": {
-        "type": "string"
-      },
-      "resource_error_carrier": {
-        "type": "string"
-      },
-      "result_meta_resource": {
-        "type": "string"
-      },
-      "sandboxes": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "schemas": {
-        "anyOf": [
-          {
-            "additionalProperties": true,
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "scope": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "server_version": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "stability": {
-        "type": "string"
-      },
-      "tiers": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "tool_details": {
-        "description": "Per-tool capability records; full schema at resource codex://capabilities-result",
-        "type": "array"
-      },
-      "tool_error_carrier": {
-        "type": "string"
-      },
-      "transport": {
-        "type": "string"
-      },
-      "version": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "name",
-      "version",
-      "transport",
-      "stability",
-      "active_tools",
-      "free_tools",
-      "tiers",
-      "sandboxes",
-      "scope",
-      "negative_scope",
-      "prerequisites",
-      "deprecation_policy"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "error": {
-        "description": "Populated error envelope; full schema at resource codex://error-envelope",
-        "type": "object"
-      },
-      "meta": {
-        "type": "object"
-      },
-      "ok": {
-        "const": false
-      }
-    },
-    "required": [
-      "ok",
-      "error",
-      "meta"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "active_tools": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "annotations_reading": {
+        "type": "string"
+      },
+      "deprecation_policy": {
+        "type": "string"
+      },
+      "error_envelope_resource": {
+        "type": "string"
+      },
+      "fingerprint": {
+        "type": "string"
+      },
+      "fingerprint_covers": {
+        "description": "A contract-semantic change in any listed category changes the fingerprint; nothing outside them does. Release identity is excluded: serverInfo.version, version, server_version change every release WITHOUT moving the fingerprint (incl. its server/discover _meta carrier).",
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "free_tools": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "name": {
+        "type": "string"
+      },
+      "negative_scope": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "ok": {
+        "const": true,
+        "type": "boolean"
+      },
+      "prerequisites": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "protocol_revision": {
+        "type": "string"
+      },
+      "resource_error_carrier": {
+        "type": "string"
+      },
+      "result_meta_resource": {
+        "type": "string"
+      },
+      "sandboxes": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "schemas": {
+        "anyOf": [
+          {
+            "additionalProperties": true,
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "scope": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "server_version": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "stability": {
+        "type": "string"
+      },
+      "tiers": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "tool_details": {
+        "description": "Per-tool capability records; full schema at resource codex://capabilities-result",
+        "type": "array"
+      },
+      "tool_error_carrier": {
+        "type": "string"
+      },
+      "transport": {
+        "type": "string"
+      },
+      "version": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "name",
+      "version",
+      "transport",
+      "stability",
+      "active_tools",
+      "free_tools",
+      "tiers",
+      "sandboxes",
+      "scope",
+      "negative_scope",
+      "prerequisites",
+      "deprecation_policy"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "error": {
+        "description": "Populated error envelope; full schema at resource codex://error-envelope",
+        "type": "object"
+      },
+      "meta": {
+        "type": "object"
+      },
+      "ok": {
+        "const": false
+      }
+    },
+    "required": [
+      "ok",
+      "error",
+      "meta"
+    ],
+    "type": "object"
+  }
+]
  3. Changed4 schema fields changedv0.17.0
    • addedInput schema / properties / detail
      Added value: +{
+  "default": "summary",
+  "description": "What to return: 'summary' (default) returns each tool's name, cost, stability, and error_codes; the *_async tools also get async_lifecycle. 'full' adds use_when, returns, and the parameter lists (which tools/list already carries). 'contracts' drops tool_details: fetch a schema, or recheck fingerprint, without re-paying for the inventory.",
+  "enum": [
+    "summary",
+    "full",
+    "contracts"
+  ],
+  "type": "string"
+}
    • changedInput schema / properties / include_schemas / anyOf
      Previous value: -[
-  {
-    "items": {
-      "enum": [
-        "error-envelope",
-        "result-meta",
-        "capabilities-result",
-        "status-result"
-      ],
-      "type": "string"
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "items": {
+      "enum": [
+        "error-envelope",
+        "result-meta",
+        "capabilities-result",
+        "status-result",
+        "parameter-contracts"
+      ],
+      "type": "string"
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]
    • changedInput schema / properties / include_schemas / description
      Previous value: -"Opt-in tool-reachable fallback for resource-blind clients: also embed the full 'error-envelope', 'result-meta', 'capabilities-result', and/or 'status-result' schema in the response (the default payload omits them and points at the codex:// resources instead)."New value: +"Opt-in tool-reachable fallback for resource-blind clients: also embed the full 'error-envelope', 'result-meta', 'capabilities-result', and/or 'status-result' schema, and/or the 'parameter-contracts' document (a contract doc, not a JSON Schema, sourced from the codex://params resource body), in the response — the default payload omits them and points at the codex:// resources instead."
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "active_tools": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "deprecation_policy": {
-        "type": "string"
-      },
-      "error_envelope_resource": {
-        "type": "string"
-      },
-      "fingerprint": {
-        "type": "string"
-      },
-      "fingerprint_covers": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "free_tools": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "name": {
-        "type": "string"
-      },
-      "negative_scope": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "ok": {
-        "const": true,
-        "type": "boolean"
-      },
-      "prerequisites": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "resource_error_carrier": {
-        "type": "string"
-      },
-      "result_meta_resource": {
-        "type": "string"
-      },
-      "sandboxes": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "schemas": {
-        "anyOf": [
-          {
-            "additionalProperties": true,
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "scope": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "server_version": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "stability": {
-        "type": "string"
-      },
-      "tiers": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "tool_details": {
-        "description": "Per-tool capability records; full schema at resource codex://capabilities-result",
-        "type": "array"
-      },
-      "tool_error_carrier": {
-        "type": "string"
-      },
-      "transport": {
-        "type": "string"
-      },
-      "version": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "name",
-      "version",
-      "transport",
-      "stability",
-      "active_tools",
-      "free_tools",
-      "tiers",
-      "sandboxes",
-      "scope",
-      "negative_scope",
-      "prerequisites",
-      "deprecation_policy"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "error": {
-        "description": "Populated error envelope; full schema at resource codex://error-envelope",
-        "type": "object"
-      },
-      "meta": {
-        "type": "object"
-      },
-      "ok": {
-        "const": false
-      }
-    },
-    "required": [
-      "ok",
-      "error",
-      "meta"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "active_tools": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "annotations_reading": {
+        "type": "string"
+      },
+      "deprecation_policy": {
+        "type": "string"
+      },
+      "error_envelope_resource": {
+        "type": "string"
+      },
+      "fingerprint": {
+        "type": "string"
+      },
+      "fingerprint_covers": {
+        "description": "A contract-semantic change in any listed category changes the fingerprint; nothing outside them does. Release identity is excluded: serverInfo.version, version, server_version change every release WITHOUT moving the fingerprint.",
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "free_tools": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "name": {
+        "type": "string"
+      },
+      "negative_scope": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "ok": {
+        "const": true,
+        "type": "boolean"
+      },
+      "prerequisites": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "protocol_revision": {
+        "type": "string"
+      },
+      "resource_error_carrier": {
+        "type": "string"
+      },
+      "result_meta_resource": {
+        "type": "string"
+      },
+      "sandboxes": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "schemas": {
+        "anyOf": [
+          {
+            "additionalProperties": true,
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "scope": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "server_version": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "stability": {
+        "type": "string"
+      },
+      "tiers": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "tool_details": {
+        "description": "Per-tool capability records; full schema at resource codex://capabilities-result",
+        "type": "array"
+      },
+      "tool_error_carrier": {
+        "type": "string"
+      },
+      "transport": {
+        "type": "string"
+      },
+      "version": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "name",
+      "version",
+      "transport",
+      "stability",
+      "active_tools",
+      "free_tools",
+      "tiers",
+      "sandboxes",
+      "scope",
+      "negative_scope",
+      "prerequisites",
+      "deprecation_policy"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "error": {
+        "description": "Populated error envelope; full schema at resource codex://error-envelope",
+        "type": "object"
+      },
+      "meta": {
+        "type": "object"
+      },
+      "ok": {
+        "const": false
+      }
+    },
+    "required": [
+      "ok",
+      "error",
+      "meta"
+    ],
+    "type": "object"
+  }
+]
  4. Changed1 schema field changedv0.11.0
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "active_tools": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "deprecation_policy": {
-        "type": "string"
-      },
-      "error_envelope_resource": {
-        "type": "string"
-      },
-      "fingerprint": {
-        "type": "string"
-      },
-      "fingerprint_covers": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "free_tools": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "name": {
-        "type": "string"
-      },
-      "negative_scope": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "ok": {
-        "const": true,
-        "type": "boolean"
-      },
-      "prerequisites": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "resource_error_carrier": {
-        "type": "string"
-      },
-      "result_meta_resource": {
-        "type": "string"
-      },
-      "sandboxes": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "schemas": {
-        "anyOf": [
-          {
-            "additionalProperties": true,
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "scope": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "stability": {
-        "type": "string"
-      },
-      "tiers": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "tool_details": {
-        "description": "Per-tool capability records; full schema at resource codex://capabilities-result",
-        "type": "array"
-      },
-      "tool_error_carrier": {
-        "type": "string"
-      },
-      "transport": {
-        "type": "string"
-      },
-      "version": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "name",
-      "version",
-      "transport",
-      "stability",
-      "active_tools",
-      "free_tools",
-      "tiers",
-      "sandboxes",
-      "scope",
-      "negative_scope",
-      "prerequisites",
-      "deprecation_policy"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "error": {
-        "description": "Populated error envelope; full schema at resource codex://error-envelope",
-        "type": "object"
-      },
-      "meta": {
-        "type": "object"
-      },
-      "ok": {
-        "const": false
-      }
-    },
-    "required": [
-      "ok",
-      "error",
-      "meta"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "active_tools": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "deprecation_policy": {
+        "type": "string"
+      },
+      "error_envelope_resource": {
+        "type": "string"
+      },
+      "fingerprint": {
+        "type": "string"
+      },
+      "fingerprint_covers": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "free_tools": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "name": {
+        "type": "string"
+      },
+      "negative_scope": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "ok": {
+        "const": true,
+        "type": "boolean"
+      },
+      "prerequisites": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "resource_error_carrier": {
+        "type": "string"
+      },
+      "result_meta_resource": {
+        "type": "string"
+      },
+      "sandboxes": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "schemas": {
+        "anyOf": [
+          {
+            "additionalProperties": true,
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "scope": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "server_version": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "stability": {
+        "type": "string"
+      },
+      "tiers": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "tool_details": {
+        "description": "Per-tool capability records; full schema at resource codex://capabilities-result",
+        "type": "array"
+      },
+      "tool_error_carrier": {
+        "type": "string"
+      },
+      "transport": {
+        "type": "string"
+      },
+      "version": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "name",
+      "version",
+      "transport",
+      "stability",
+      "active_tools",
+      "free_tools",
+      "tiers",
+      "sandboxes",
+      "scope",
+      "negative_scope",
+      "prerequisites",
+      "deprecation_policy"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "error": {
+        "description": "Populated error envelope; full schema at resource codex://error-envelope",
+        "type": "object"
+      },
+      "meta": {
+        "type": "object"
+      },
+      "ok": {
+        "const": false
+      }
+    },
+    "required": [
+      "ok",
+      "error",
+      "meta"
+    ],
+    "type": "object"
+  }
+]
  5. Changed3 schema fields changedv0.9.0
    • changedInput schema / properties / include_schemas / anyOf
      Previous value: -[
-  {
-    "items": {
-      "enum": [
-        "error-envelope",
-        "result-meta"
-      ],
-      "type": "string"
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "items": {
+      "enum": [
+        "error-envelope",
+        "result-meta",
+        "capabilities-result",
+        "status-result"
+      ],
+      "type": "string"
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]
    • changedInput schema / properties / include_schemas / description
      Previous value: -"Opt-in tool-reachable fallback for resource-blind clients: also embed the full 'error-envelope' and/or 'result-meta' schema in the response (the default payload omits them and points at the codex:// resources instead)."New value: +"Opt-in tool-reachable fallback for resource-blind clients: also embed the full 'error-envelope', 'result-meta', 'capabilities-result', and/or 'status-result' schema in the response (the default payload omits them and points at the codex:// resources instead)."
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "active_tools": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "deprecation_policy": {
-        "type": "string"
-      },
-      "error_envelope_resource": {
-        "type": "string"
-      },
-      "fingerprint": {
-        "type": "string"
-      },
-      "fingerprint_covers": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "free_tools": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "name": {
-        "type": "string"
-      },
-      "negative_scope": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "ok": {
-        "const": true,
-        "type": "boolean"
-      },
-      "prerequisites": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "resource_error_carrier": {
-        "type": "string"
-      },
-      "result_meta_resource": {
-        "type": "string"
-      },
-      "sandboxes": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "schemas": {
-        "anyOf": [
-          {
-            "additionalProperties": true,
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "scope": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "stability": {
-        "type": "string"
-      },
-      "tiers": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "tool_details": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "async_lifecycle": {
-              "anyOf": [
-                {
-                  "additionalProperties": false,
-                  "properties": {
-                    "activity_support": {
-                      "const": "codex_events",
-                      "type": "string"
-                    },
-                    "cancel_tool": {
-                      "type": "string"
-                    },
-                    "consume_tool": {
-                      "type": "string"
-                    },
-                    "event_age_field": {
-                      "type": "string"
-                    },
-                    "event_count_field": {
-                      "type": "string"
-                    },
-                    "last_event_field": {
-                      "type": "string"
-                    },
-                    "lifecycle": {
-                      "const": "codex_job_*",
-                      "type": "string"
-                    },
-                    "list_tool": {
-                      "type": "string"
-                    },
-                    "native_task_support": {
-                      "const": false,
-                      "type": "boolean"
-                    },
-                    "poll_after_field": {
-                      "type": "string"
-                    },
-                    "poll_tool": {
-                      "type": "string"
-                    },
-                    "progress_support": {
-                      "const": "none",
-                      "type": "string"
-                    },
-                    "result_ready_field": {
-                      "type": "string"
-                    },
-                    "result_tool": {
-                      "type": "string"
-                    },
-                    "status_field": {
-                      "type": "string"
-                    }
-                  },
-                  "required": [
-                    "poll_tool",
-                    "result_tool",
-                    "consume_tool",
-                    "cancel_tool",
-                    "list_tool",
-                    "status_field",
-                    "result_ready_field",
-                    "poll_after_field",
-                    "event_count_field",
-                    "last_event_field",
-                    "event_age_field"
-                  ],
-                  "type": "object"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "cost": {
-              "enum": [
-                "free",
-                "active"
-              ],
-              "type": "string"
-            },
-            "error_codes": {
-              "items": {
-                "enum": [
-                  "codex_not_found",
-                  "codex_auth_required",
-                  "unexpanded_env_placeholder",
-                  "unsupported_tier",
-                  "unsupported_sandbox",
-                  "unsupported_isolation",
-                  "unsupported_detail",
-                  "invalid_scope",
-                  "invalid_base",
-                  "invalid_commit",
-                  "invalid_paths",
-                  "invalid_arguments",
-                  "invalid_workspace_root",
-                  "workspace_outside_roots",
-                  "input_too_large",
-                  "not_a_git_repo",
-                  "git_unavailable",
-                  "worktree_error",
-                  "context_too_large",
-                  "resource_not_found",
-                  "timeout",
-                  "nonzero_exit",
-                  "invalid_json",
-                  "schema_violation",
-                  "internal_error",
-                  "cli_contract_changed",
-                  "codex_rate_limited",
-                  "job_not_found",
-                  "job_running",
-                  "job_cancelled",
-                  "job_timeout",
-                  "job_failed",
-                  "idempotency_conflict",
-                  "idempotency_result_unavailable",
-                  "idempotency_in_progress"
-                ],
-                "type": "string"
-              },
-              "type": "array"
-            },
-            "key_optional_params": {
-              "items": {
-                "type": "string"
-              },
-              "type": "array"
-            },
-            "name": {
-              "type": "string"
-            },
-            "required_params": {
-              "items": {
-                "type": "string"
-              },
-              "type": "array"
-            },
-            "returns": {
-              "type": "string"
-            },
-            "stability": {
-              "anyOf": [
-                {
-                  "enum": [
-                    "stable",
-                    "preview",
-                    "experimental"
-                  ],
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "use_when": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "name",
-            "cost",
-            "use_when",
-            "returns"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "tool_error_carrier": {
-        "type": "string"
-      },
-      "transport": {
-        "type": "string"
-      },
-      "version": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "name",
-      "version",
-      "transport",
-      "stability",
-      "active_tools",
-      "free_tools",
-      "tiers",
-      "sandboxes",
-      "scope",
-      "negative_scope",
-      "prerequisites",
-      "deprecation_policy"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "error": {
-        "description": "Populated error envelope; full schema at resource codex://error-envelope",
-        "type": "object"
-      },
-      "meta": {
-        "type": "object"
-      },
-      "ok": {
-        "const": false
-      }
-    },
-    "required": [
-      "ok",
-      "error",
-      "meta"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "active_tools": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "deprecation_policy": {
+        "type": "string"
+      },
+      "error_envelope_resource": {
+        "type": "string"
+      },
+      "fingerprint": {
+        "type": "string"
+      },
+      "fingerprint_covers": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "free_tools": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "name": {
+        "type": "string"
+      },
+      "negative_scope": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "ok": {
+        "const": true,
+        "type": "boolean"
+      },
+      "prerequisites": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "resource_error_carrier": {
+        "type": "string"
+      },
+      "result_meta_resource": {
+        "type": "string"
+      },
+      "sandboxes": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "schemas": {
+        "anyOf": [
+          {
+            "additionalProperties": true,
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "scope": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "stability": {
+        "type": "string"
+      },
+      "tiers": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "tool_details": {
+        "description": "Per-tool capability records; full schema at resource codex://capabilities-result",
+        "type": "array"
+      },
+      "tool_error_carrier": {
+        "type": "string"
+      },
+      "transport": {
+        "type": "string"
+      },
+      "version": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "name",
+      "version",
+      "transport",
+      "stability",
+      "active_tools",
+      "free_tools",
+      "tiers",
+      "sandboxes",
+      "scope",
+      "negative_scope",
+      "prerequisites",
+      "deprecation_policy"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "error": {
+        "description": "Populated error envelope; full schema at resource codex://error-envelope",
+        "type": "object"
+      },
+      "meta": {
+        "type": "object"
+      },
+      "ok": {
+        "const": false
+      }
+    },
+    "required": [
+      "ok",
+      "error",
+      "meta"
+    ],
+    "type": "object"
+  }
+]
  6. Changed3 schema fields changedv0.8.0
    • addedInput schema / properties / include_schemas
      Added value: +{
+  "anyOf": [
+    {
+      "items": {
+        "enum": [
+          "error-envelope",
+          "result-meta"
+        ],
+        "type": "string"
+      },
+      "type": "array"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Opt-in tool-reachable fallback for resource-blind clients: also embed the full 'error-envelope' and/or 'result-meta' schema in the response (the default payload omits them and points at the codex:// resources instead)."
+}
    • addedOutput schema / $schema
      Added value: +"https://json-schema.org/draft/2020-12/schema"
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "active_tools": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "deprecation_policy": {
-        "type": "string"
-      },
-      "error_envelope_resource": {
-        "type": "string"
-      },
-      "fingerprint": {
-        "type": "string"
-      },
-      "free_tools": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "name": {
-        "type": "string"
-      },
-      "negative_scope": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "ok": {
-        "const": true,
-        "type": "boolean"
-      },
-      "prerequisites": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "sandboxes": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "scope": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "stability": {
-        "type": "string"
-      },
-      "tiers": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "tool_details": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "async_lifecycle": {
-              "anyOf": [
-                {
-                  "additionalProperties": false,
-                  "properties": {
-                    "activity_support": {
-                      "const": "codex_events",
-                      "type": "string"
-                    },
-                    "cancel_tool": {
-                      "type": "string"
-                    },
-                    "consume_tool": {
-                      "type": "string"
-                    },
-                    "event_age_field": {
-                      "type": "string"
-                    },
-                    "event_count_field": {
-                      "type": "string"
-                    },
-                    "last_event_field": {
-                      "type": "string"
-                    },
-                    "lifecycle": {
-                      "const": "codex_job_*",
-                      "type": "string"
-                    },
-                    "list_tool": {
-                      "type": "string"
-                    },
-                    "native_task_support": {
-                      "const": false,
-                      "type": "boolean"
-                    },
-                    "poll_after_field": {
-                      "type": "string"
-                    },
-                    "poll_tool": {
-                      "type": "string"
-                    },
-                    "progress_support": {
-                      "const": "none",
-                      "type": "string"
-                    },
-                    "result_ready_field": {
-                      "type": "string"
-                    },
-                    "result_tool": {
-                      "type": "string"
-                    },
-                    "status_field": {
-                      "type": "string"
-                    }
-                  },
-                  "required": [
-                    "poll_tool",
-                    "result_tool",
-                    "consume_tool",
-                    "cancel_tool",
-                    "list_tool",
-                    "status_field",
-                    "result_ready_field",
-                    "poll_after_field",
-                    "event_count_field",
-                    "last_event_field",
-                    "event_age_field"
-                  ],
-                  "type": "object"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "cost": {
-              "enum": [
-                "free",
-                "active"
-              ],
-              "type": "string"
-            },
-            "error_codes": {
-              "items": {
-                "enum": [
-                  "codex_not_found",
-                  "codex_auth_required",
-                  "unexpanded_env_placeholder",
-                  "unsupported_tier",
-                  "unsupported_sandbox",
-                  "unsupported_isolation",
-                  "unsupported_detail",
-                  "invalid_scope",
-                  "invalid_base",
-                  "invalid_commit",
-                  "invalid_paths",
-                  "invalid_arguments",
-                  "invalid_workspace_root",
-                  "workspace_outside_roots",
-                  "input_too_large",
-                  "not_a_git_repo",
-                  "git_unavailable",
-                  "worktree_error",
-                  "context_too_large",
-                  "timeout",
-                  "nonzero_exit",
-                  "invalid_json",
-                  "schema_violation",
-                  "internal_error",
-                  "cli_contract_changed",
-                  "codex_rate_limited",
-                  "job_not_found",
-                  "job_running",
-                  "job_cancelled",
-                  "job_timeout",
-                  "job_failed"
-                ],
-                "type": "string"
-              },
-              "type": "array"
-            },
-            "key_optional_params": {
-              "items": {
-                "type": "string"
-              },
-              "type": "array"
-            },
-            "name": {
-              "type": "string"
-            },
-            "required_params": {
-              "items": {
-                "type": "string"
-              },
-              "type": "array"
-            },
-            "returns": {
-              "type": "string"
-            },
-            "stability": {
-              "anyOf": [
-                {
-                  "enum": [
-                    "stable",
-                    "preview",
-                    "experimental"
-                  ],
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "use_when": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "name",
-            "cost",
-            "use_when",
-            "returns"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "transport": {
-        "type": "string"
-      },
-      "version": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "name",
-      "version",
-      "transport",
-      "stability",
-      "active_tools",
-      "free_tools",
-      "tiers",
-      "sandboxes",
-      "scope",
-      "negative_scope",
-      "prerequisites",
-      "deprecation_policy"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "error": {
-        "description": "Populated error envelope; full schema at resource codex://error-envelope",
-        "type": "object"
-      },
-      "meta": {
-        "type": "object"
-      },
-      "ok": {
-        "const": false
-      }
-    },
-    "required": [
-      "ok",
-      "error",
-      "meta"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "active_tools": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "deprecation_policy": {
+        "type": "string"
+      },
+      "error_envelope_resource": {
+        "type": "string"
+      },
+      "fingerprint": {
+        "type": "string"
+      },
+      "fingerprint_covers": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "free_tools": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "name": {
+        "type": "string"
+      },
+      "negative_scope": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "ok": {
+        "const": true,
+        "type": "boolean"
+      },
+      "prerequisites": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "resource_error_carrier": {
+        "type": "string"
+      },
+      "result_meta_resource": {
+        "type": "string"
+      },
+      "sandboxes": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "schemas": {
+        "anyOf": [
+          {
+            "additionalProperties": true,
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "scope": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "stability": {
+        "type": "string"
+      },
+      "tiers": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "tool_details": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "async_lifecycle": {
+              "anyOf": [
+                {
+                  "additionalProperties": false,
+                  "properties": {
+                    "activity_support": {
+                      "const": "codex_events",
+                      "type": "string"
+                    },
+                    "cancel_tool": {
+                      "type": "string"
+                    },
+                    "consume_tool": {
+                      "type": "string"
+                    },
+                    "event_age_field": {
+                      "type": "string"
+                    },
+                    "event_count_field": {
+                      "type": "string"
+                    },
+                    "last_event_field": {
+                      "type": "string"
+                    },
+                    "lifecycle": {
+                      "const": "codex_job_*",
+                      "type": "string"
+                    },
+                    "list_tool": {
+                      "type": "string"
+                    },
+                    "native_task_support": {
+                      "const": false,
+                      "type": "boolean"
+                    },
+                    "poll_after_field": {
+                      "type": "string"
+                    },
+                    "poll_tool": {
+                      "type": "string"
+                    },
+                    "progress_support": {
+                      "const": "none",
+                      "type": "string"
+                    },
+                    "result_ready_field": {
+                      "type": "string"
+                    },
+                    "result_tool": {
+                      "type": "string"
+                    },
+                    "status_field": {
+                      "type": "string"
+                    }
+                  },
+                  "required": [
+                    "poll_tool",
+                    "result_tool",
+                    "consume_tool",
+                    "cancel_tool",
+                    "list_tool",
+                    "status_field",
+                    "result_ready_field",
+                    "poll_after_field",
+                    "event_count_field",
+                    "last_event_field",
+                    "event_age_field"
+                  ],
+                  "type": "object"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "cost": {
+              "enum": [
+                "free",
+                "active"
+              ],
+              "type": "string"
+            },
+            "error_codes": {
+              "items": {
+                "enum": [
+                  "codex_not_found",
+                  "codex_auth_required",
+                  "unexpanded_env_placeholder",
+                  "unsupported_tier",
+                  "unsupported_sandbox",
+                  "unsupported_isolation",
+                  "unsupported_detail",
+                  "invalid_scope",
+                  "invalid_base",
+                  "invalid_commit",
+                  "invalid_paths",
+                  "invalid_arguments",
+                  "invalid_workspace_root",
+                  "workspace_outside_roots",
+                  "input_too_large",
+                  "not_a_git_repo",
+                  "git_unavailable",
+                  "worktree_error",
+                  "context_too_large",
+                  "resource_not_found",
+                  "timeout",
+                  "nonzero_exit",
+                  "invalid_json",
+                  "schema_violation",
+                  "internal_error",
+                  "cli_contract_changed",
+                  "codex_rate_limited",
+                  "job_not_found",
+                  "job_running",
+                  "job_cancelled",
+                  "job_timeout",
+                  "job_failed",
+                  "idempotency_conflict",
+                  "idempotency_result_unavailable",
+                  "idempotency_in_progress"
+                ],
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "key_optional_params": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "name": {
+              "type": "string"
+            },
+            "required_params": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "returns": {
+              "type": "string"
+            },
+            "stability": {
+              "anyOf": [
+                {
+                  "enum": [
+                    "stable",
+                    "preview",
+                    "experimental"
+                  ],
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "use_when": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "name",
+            "cost",
+            "use_when",
+            "returns"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "tool_error_carrier": {
+        "type": "string"
+      },
+      "transport": {
+        "type": "string"
+      },
+      "version": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "name",
+      "version",
+      "transport",
+      "stability",
+      "active_tools",
+      "free_tools",
+      "tiers",
+      "sandboxes",
+      "scope",
+      "negative_scope",
+      "prerequisites",
+      "deprecation_policy"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "error": {
+        "description": "Populated error envelope; full schema at resource codex://error-envelope",
+        "type": "object"
+      },
+      "meta": {
+        "type": "object"
+      },
+      "ok": {
+        "const": false
+      }
+    },
+    "required": [
+      "ok",
+      "error",
+      "meta"
+    ],
+    "type": "object"
+  }
+]
  7. First observedv0.5.0

TDQS

A4.2/5.0
Behavior4/5

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

Annotations already cover readOnlyHint and openWorldHint, so the description's added value is the cost and caching profile: 'Free — no model call' and 'Clients can cache by the fingerprint,' plus the deprecation status. These are behavioral facts annotations cannot express. It stops short of explaining what the fingerprint is or how staleness is handled, keeping it below 5.

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

Conciseness4/5

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

The deprecation notice is front-loaded, and each subsequent sentence maps to a distinct concern (cost/caching, detail modes, include_schemas). It is dense with backticked tokens but has little waste; the include_schemas sentence is the longest and slightly overloaded.

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

Completeness4/5

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

With an output schema present, return values need no prose, and the description still covers deprecation, cost, caching, all three detail modes, and the schema-embedding escape hatch. The only soft spot is the unexplained term 'tiers' and the fingerprint's semantics, which an agent may want when reasoning about cache validity.

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

Parameters4/5

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

Schema description coverage is 100%, so the baseline is 3, but the description adds genuine meaning: it explains that 'contracts' omits tool_details specifically so a caller can recheck a fingerprint without re-paying for the inventory, and frames include_schemas as a fallback for resource-blind clients. That rationale goes beyond the schema's field-level text.

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 states a specific verb and resource: 'List this server's tools, tiers, and the result fingerprint,' which is concrete and distinct from the job/job-status siblings. It does not explicitly contrast with codex_status or codex_models, but the deprecation pointer to amicus_capabilities gives the agent a routing decision it can act on.

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

Usage Guidelines5/5

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

It names the replacement tool and the condition that selects it ('Deprecated: use amicus_capabilities'), which is the strongest form of when-not-to-use guidance. It also gives per-mode guidance, including the notable caveat that detail="full" mostly restates what the caller already holds from tools/list, so the agent can pick the cheapest sufficient mode.

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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