Utility Matrix

Change Failure Rate Calculator

change-failure-rate-calculator

Read-onlyIdempotent

Use when a user asks about change failure rate or DORA CFR. Given total and failed deployments, returns failure rate percentage and DORA tier.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`total_deploys`	Yes	total deploys used by this deterministic tool.
`failed_deploys`	Yes	failed deploys used by this deterministic tool.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`next_step`	Yes
`dora_rating`	Yes
`output_tier`	Yes
`total_count`	Yes
`failed_count`	Yes
`signal_value`	Yes
`next_step_url`	Yes
`remaining_pct`	Yes
`why_follow_up`	Yes
`interpretation`	Yes
`affiliate_context`	No
`computation_basis`	Yes
`change_failure_rate_pct`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed4 schema fields changedSep 28, 2026
- addedInput schema / properties / failed_deploys / description
```
Added value: +"failed deploys used by this deterministic tool."
```
- addedInput schema / properties / failed_deploys / examples
```
Added value: +[
+  1
+]
```
- addedInput schema / properties / total_deploys / description
```
Added value: +"total deploys used by this deterministic tool."
```
- addedInput schema / properties / total_deploys / examples
```
Added value: +[
+  1
+]
```

Changed1 schema field changedJul 15, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": false,
+  "properties": {
+    "affiliate_context": {
+      "additionalProperties": false,
+      "properties": {
+        "affiliate": {
+          "type": "string"
+        },
+        "cta_label": {
+          "type": "string"
+        },
+        "disclosure": {
+          "type": "string"
+        },
+        "framing": {
+          "type": "string"
+        },
+        "posture": {
+          "enum": [
+            "secondary"
+          ],
+          "type": "string"
+        },
+        "slot_id": {
+          "type": "string"
+        },
+        "url": {
+          "type": "string"
+        },
+        "variant": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "affiliate",
+        "cta_label",
+        "disclosure",
+        "framing",
+        "posture",
+        "slot_id",
+        "url",
+        "variant"
+      ],
+      "type": "object"
+    },
+    "change_failure_rate_pct": {
+      "type": "number"
+    },
+    "computation_basis": {
+      "type": "string"
+    },
+    "dora_rating": {
+      "type": "string"
+    },
+    "failed_count": {
+      "type": "number"
+    },
+    "interpretation": {
+      "type": "string"
+    },
+    "next_step": {
+      "type": "string"
+    },
+    "next_step_url": {
+      "type": "string"
+    },
+    "output_tier": {
+      "type": "string"
+    },
+    "remaining_pct": {
+      "type": "number"
+    },
+    "signal_value": {
+      "type": "number"
+    },
+    "total_count": {
+      "type": "number"
+    },
+    "why_follow_up": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "change_failure_rate_pct",
+    "computation_basis",
+    "dora_rating",
+    "failed_count",
+    "interpretation",
+    "next_step",
+    "next_step_url",
+    "output_tier",
+    "remaining_pct",
+    "signal_value",
+    "total_count",
+    "why_follow_up"
+  ],
+  "type": "object"
+}

Changed1 schema field changedJul 13, 2026
- addedInput schema / additionalProperties
```
Added value: +false
```
First observedJun 29, 2026

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