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codex-in-claude

by briandconnelly
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Python
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List Codex models (free)

codex_models
Read-only

List Codex model slugs and their advertised reasoning-effort settings to choose a valid model parameter for Codex calls. Advisory discovery only; no model call needed.

Instructions

List Codex model slugs you can pass as model, with each model's advertised reasoning-effort set for reasoning_effort. Free — no model call.

Advisory discovery only: read from Codex's on-disk cache when present, else a bundled fallback (source says which; the fallback carries no effort data). codex exec validates the real slug and the backend validates the real effort, so an unlisted value may still work and a listed one may be unavailable to your account. Same payload as the codex://models resource. Not fingerprint-stable — do not cache it by the capabilities fingerprint.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
okYes

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

  1. Changed1 schema field changedv0.13.0
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "advisory": {
-        "type": "string"
-      },
-      "cache_client_version": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "fetched_at": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "fingerprint": {
-        "type": "string"
-      },
-      "models": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "display_name": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "slug": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "slug"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "ok": {
-        "const": true,
-        "type": "boolean"
-      },
-      "server_version": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "source": {
-        "enum": [
-          "cache",
-          "static",
-          "none"
-        ],
-        "type": "string"
-      },
-      "unavailable_reason": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "required": [
-      "source",
-      "advisory"
-    ],
-    "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": {
+      "advisory": {
+        "type": "string"
+      },
+      "cache_client_version": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "fetched_at": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "fingerprint": {
+        "type": "string"
+      },
+      "models": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "default_reasoning_effort": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "description": "This model's default reasoning effort as advertised by Codex's on-disk cache; advisory only. null = the cache advertised nothing usable (the static fallback never carries effort data)."
+            },
+            "display_name": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "slug": {
+              "type": "string"
+            },
+            "supported_reasoning_efforts": {
+              "anyOf": [
+                {
+                  "items": {
+                    "type": "string"
+                  },
+                  "type": "array"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "description": "Effort tokens this model advertises in Codex's on-disk cache; advisory only — the backend's accepted set varies by account and an unlisted effort may still work. null = the cache advertised nothing usable; [] = an explicitly empty advertised set."
+            }
+          },
+          "required": [
+            "slug"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "ok": {
+        "const": true,
+        "type": "boolean"
+      },
+      "server_version": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "source": {
+        "enum": [
+          "cache",
+          "static",
+          "none"
+        ],
+        "type": "string"
+      },
+      "unavailable_reason": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "required": [
+      "source",
+      "advisory"
+    ],
+    "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"
+  }
+]
  2. Changed1 schema field changedv0.11.0
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "advisory": {
-        "type": "string"
-      },
-      "cache_client_version": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "fetched_at": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "fingerprint": {
-        "type": "string"
-      },
-      "models": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "display_name": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "slug": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "slug"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "ok": {
-        "const": true,
-        "type": "boolean"
-      },
-      "source": {
-        "enum": [
-          "cache",
-          "static",
-          "none"
-        ],
-        "type": "string"
-      },
-      "unavailable_reason": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "required": [
-      "source",
-      "advisory"
-    ],
-    "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": {
+      "advisory": {
+        "type": "string"
+      },
+      "cache_client_version": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "fetched_at": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "fingerprint": {
+        "type": "string"
+      },
+      "models": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "display_name": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "slug": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "slug"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "ok": {
+        "const": true,
+        "type": "boolean"
+      },
+      "server_version": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "source": {
+        "enum": [
+          "cache",
+          "static",
+          "none"
+        ],
+        "type": "string"
+      },
+      "unavailable_reason": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "required": [
+      "source",
+      "advisory"
+    ],
+    "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. Changed1 schema field changedv0.8.0
    • addedOutput schema / $schema
      Added value: +"https://json-schema.org/draft/2020-12/schema"
  4. First observedv0.5.0

TDQS

A4.7/5.0
Behavior5/5

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

Annotations already declare readOnlyHint=true, but the description adds significant behavioral context: reads from cache with fallback, 'source' field indicates provenance, fallback lacks effort data, and backend validation may reject listed values or accept unlisted ones. It also notes the payload is the same as a resource, going far beyond the annotation.

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

Conciseness5/5

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

Each sentence adds a distinct piece of information: purpose, cost, source, validation caveats, payload equivalence, and caching instability. The description is front-loaded with the main action and is compact despite the detail.

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 zero-parameter read-only tool with an output schema, the description fully explains what the tool returns, how it obtains data, its reliability, and its relationship to other resources. There are no obvious gaps.

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?

Zero parameters means no schema to elaborate. The description still explains the output meaning (model slugs and reasoning-effort sets) and the source field, which is helpful even though the output schema is present.

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?

The description states a specific verb and resource: 'List Codex model slugs...' with the additional clarification of the reasoning-effort data. It clearly distinguishes this from sibling tools by focusing on model discovery and the 'codex://models resource' equivalence.

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?

The description provides clear context on when to use (advisory discovery) and explicitly warns against certain uses ('do not cache it by the capabilities fingerprint'). It does not name alternative tools explicitly, so it misses the full 'when not / alternatives' bar.

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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