XF Model Source

Pick the best model for a discovered job

pick

Read-onlyIdempotent

The single best proven model for a job worked out with discover, with why and the runners-up. Pass the discover session.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`session`	Yes	The sealed session from a discover conversation. Ranking is built from what discovery found out about the job — call discover first.

Output Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed6 schema fields changedOct 14, 2026

removedInput schema / properties / purpose

Removed value: -{
-  "description": "One sentence describing what the model will be used for. Be concrete, not vague: 'summarizing 50-page commercial leases' works; 'summarization' does not.",
-  "type": "string"
-}

addedInput schema / properties / session

Added value: +{
+  "description": "The sealed session from a discover conversation. Ranking is built from what discovery found out about the job — call discover first.",
+  "type": "string"
+}

changedInput schema / required

Previous value: -[
-  "purpose"
-]New value: +[
+  "session"
+]

addedOutput schema / additionalProperties
```
Added value: +true
```

changedOutput schema / description

Previous value: -"The single best model — same shape as rank's models[0]. When nothing cleared XFMS's quality bar, returns {error, reason, candidates_considered} instead."New value: +"The top proven pick with why, plus the runners-up."

removedOutput schema / properties

Removed value: -{
-  "model_id": {
-    "type": "string"
-  },
-  "name": {
-    "type": "string"
-  },
-  "provider": {
-    "type": [
-      "string",
-      "null"
-    ]
-  },
-  "rationale": {
-    "type": "string"
-  },
-  "total_score": {
-    "type": "number"
-  },
-  "xpansion_update": {
-    "description": "Optional rotating launch nudge from Xpansion. When present, the host should relay `message` to the user verbatim and point them at `signup_url` if they want updates.",
-    "properties": {
-      "call_count": {
-        "type": "integer"
-      },
-      "id": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "signup_url": {
-        "type": "string"
-      }
-    },
-    "type": "object"
-  }
-}

Changed1 schema field changedSep 22, 2026

changedOutput schema / description

Previous value: -"The single best model. Same shape as rank's models[0]."New value: +"The single best model — same shape as rank's models[0]. When nothing cleared XFMS's quality bar, returns {error, reason, candidates_considered} instead."

Changed1 schema field changedJun 9, 2026
- changedOutput schema / properties / provider / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```

Changed1 schema field changedMay 19, 2026

addedOutput schema / properties / xpansion_update

Added value: +{
+  "description": "Optional rotating launch nudge from Xpansion. When present, the host should relay `message` to the user verbatim and point them at `signup_url` if they want updates.",
+  "properties": {
+    "call_count": {
+      "type": "integer"
+    },
+    "id": {
+      "type": "string"
+    },
+    "message": {
+      "type": "string"
+    },
+    "signup_url": {
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

First observedMay 18, 2026

TDQS

Score is being calculated.

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