XFMS — Xpansion Framework Model Source

Work out what the job really needs

discover

Read-onlyIdempotent

Discovery: finds the true requirements of the person's job before any model is chosen. Start with purpose: the reply carries the discovery instructions and the evidence catalogue. YOU ask the person the questions (one thing each, plain words, offering the returned choices); then call again with the sealed session, their answers and your structured updates. Each reply gives progress, rejected updates with reasons, next targets, answer choices from live data and a shortlist. At most 5 rounds. Ends with a confirmation view; call with confirm=true once the person agrees. The person can stop any time (end_now=true). Nothing about the person is stored by XFMS.

Input Schema

TableJSON Schema

Name	Required	Description
`answers`	No	The person's answers this round, keyed by the question you asked them (short key or the question text), in their exact words. For an XFMS question the person already answered earlier, send {"choice": choice id, "from_earlier": their exact earlier words} instead of asking it.
`confirm`	No	The person agrees with the confirmation view.
`context`	No	Optional, with the person's consent: short labelled excerpts (sample inputs, a conversation summary). Used for this request only, never kept.
`end_now`	No	The person wants to stop and see the best result so far.
`purpose`	No	The job the person wants an AI model for, in their own words. Needed to start.
`session`	No	The sealed session value from the previous discover response. Pass it back unchanged.
`updates`	No	What you learned from the answers, in the format the first discover reply's instructions give: conclusions, requirements, shapes, open_items, item_moves, relation, usage, survivors_matter, pushback. XFMS checks each against its rules and reports any it rejects.
`corrections`	No	Changes the person makes in the confirmation view: {requirement_id, field, value}.

Output Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedOct 15, 2026

addedInput schema / properties / answers / additionalProperties / anyOf

Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "properties": {
+      "choice": {
+        "type": "string"
+      },
+      "from_earlier": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "choice",
+      "from_earlier"
+    ],
+    "type": "object"
+  }
+]

removedInput schema / properties / answers / additionalProperties / type
```
Removed value: -"string"
```

changedInput schema / properties / answers / description

Previous value: -"The person's answers this round, keyed by the question you asked them (short key or the question text), in their exact words."New value: +"The person's answers this round, keyed by the question you asked them (short key or the question text), in their exact words. For an XFMS question the person already answered earlier, send {\"choice\": choice id, \"from_earlier\": their exact earlier words} instead of asking it."

Changed12 schema fields changedOct 14, 2026

addedInput schema / properties / answers

Added value: +{
+  "additionalProperties": {
+    "type": "string"
+  },
+  "description": "The person's answers this round, keyed by the question you asked them (short key or the question text), in their exact words.",
+  "type": "object"
+}

addedInput schema / properties / confirm

Added value: +{
+  "description": "The person agrees with the confirmation view.",
+  "type": "boolean"
+}

addedInput schema / properties / context

Added value: +{
+  "description": "Optional, with the person's consent: short labelled excerpts (sample inputs, a conversation summary). Used for this request only, never kept.",
+  "items": {
+    "properties": {
+      "label": {
+        "type": "string"
+      },
+      "text": {
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

addedInput schema / properties / corrections

Added value: +{
+  "description": "Changes the person makes in the confirmation view: {requirement_id, field, value}.",
+  "items": {
+    "type": "object"
+  },
+  "type": "array"
+}

addedInput schema / properties / end_now

Added value: +{
+  "description": "The person wants to stop and see the best result so far.",
+  "type": "boolean"
+}

changedInput schema / properties / purpose / description

Previous value: -"One sentence describing the task. The tool returns which quality dimensions XFMS would weigh for this purpose, without actually ranking any models. Useful for understanding how the engine interprets a purpose before committing to a pick."New value: +"The job the person wants an AI model for, in their own words. Needed to start."

addedInput schema / properties / session

Added value: +{
+  "description": "The sealed session value from the previous discover response. Pass it back unchanged.",
+  "type": "string"
+}

addedInput schema / properties / updates

Added value: +{
+  "description": "What you learned from the answers, in the format the first discover reply's instructions give: conclusions, requirements, shapes, open_items, item_moves, relation, usage, survivors_matter, pushback. XFMS checks each against its rules and reports any it rejects.",
+  "type": "object"
+}

removedInput schema / required
```
Removed value: -[
-  "purpose"
-]
```
addedOutput schema / additionalProperties
```
Added value: +true
```

addedOutput schema / description

Added value: +"stage (one | two | confirm | confirmed), questions to relay (each with why), open items, coverage, the confirmation view when ready, and the sealed session."

removedOutput schema / properties

Removed value: -{
-  "derived_purpose": {
-    "type": "string"
-  },
-  "events": {
-    "description": "Trace of the discovery walk.",
-    "type": "array"
-  },
-  "weights": {
-    "description": "Per-dimension weights inferred for this purpose.",
-    "type": "object"
-  },
-  "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 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

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