Customer Intelligence & Segmentation

Score Customer Book (A/B/C/D)

customer_tiering

Read-only

Scores a customer book of 500 transaction rows OR FEWER into A/B/C/D tiers. Send the rows directly; this server runs the survival model (BG/NBD), spend model (Gamma-Gamma), tier migration, money layer and decision cards, and returns the full result including a per-customer ledger with explanation traces. For books LARGER than 500 rows use customer_tiering_get_engine instead — sending thousands of rows as tool arguments is slow and risks truncated JSON. Optionally accepts rep_contacts, which lets the money layer learn contact uplift from data rather than assuming it. Customer identifiers are CLEANED HERE before scoring: capitalisation, spacing, punctuation, legal-suffix and word-order variants (ACME PVT LTD / Acme Pvt. Ltd. / Acme Private Limited) are merged into one account by rule, so send the values exactly as they appear in the source and do not pre-normalise them. Anything that needs context instead of rules — 'Acme & Co' vs 'Acme Pvt Ltd', a name under two codes — comes back in identity_cleaning.review_candidates, unmerged, for you to judge from the surrounding rows and re-send via identity_overrides. Pass customer_name alongside a coded customer_id to have accounts reported by name.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`as_of`	No	Analysis date YYYY-MM-DD. Defaults to latest transaction date.
`currency`	No	ISO currency code for money display (e.g. INR, USD, EUR). No FX conversion.	USD
`rep_contacts`	No	Optional rep-activity log [{customer_id, date}, ...]. Builds touched vs untouched Markov matrices and learns contact uplift per tier (≥ 10 touched transitions). Observational, not causal.
`transactions`	Yes	Purchase rows. Each item needs customer_id, date, and amount (> 0, finite). Send customer_id exactly as the source has it: capitalisation, spacing, punctuation, legal-suffix and word-order variants are merged here by rule. Do not pre-normalise. Add customer_name when the source has a name as well as a code.
`horizon_months`	No	CLV projection horizon in months.
`currency_symbol`	No	Override display symbol (e.g. ₹, $, R$).
`identity_overrides`	No	Your judgement calls on the review_candidates a previous call reported: {raw or reported customer value -> the account it belongs to}. Spelling variants are merged automatically and need no entry here; use this only for groups the rules deliberately left separate, and only after reading the surrounding rows or asking the user.
`risk_period_months`	No	Window over which neglect churn risk is assessed.
`include_diagnostics`	No	If true, include MLE params and multi-start fit diagnostics.
`rep_queue_max_items`	No	Max length of the daily SAVE/GROW/VERIFY rep queue.
`annual_discount_rate`	No	Annual discount rate for CLV (e.g. 0.10 = 10%).
`assumed_upgrade_prob`	No	Fallback P(upgrade \| contacted). Used only when learned data from rep_contacts is insufficient for that tier.
`contact_effectiveness`	No	Fallback fraction of at-risk churn recovered by one contact. Used only when rep_contacts is missing or too sparse for that tier.
`min_customers_for_model`	No	Below this count, BG/NBD refuses to fit.
`rep_queue_min_save_revenue`	No	Ignore SAVE candidates with lifetime revenue below this.
`min_repeat_buyers_for_model`	No	Below this repeat-buyer count, BG/NBD refuses to fit.

Output Schema

TableJSON Schema

Name	Required	Description
`alerts`	No	List from the upstream customer tiering API.
`status`	Yes	1 = success, 0 = error
`message`	No
`metadata`	No	Upstream customer tiering API payload.
`customers`	Yes	List from the upstream customer tiering API.
`decisions`	Yes	Ranked plain-language manager cards (CALL NOW / GROW / CHECK). Money, days, account names only — no P(alive) / CLV / RFM jargon.
`rep_queue`	Yes
`book_summary`	No	Upstream customer tiering API payload.
`book_exposure`	No
`uplift_targets`	No	List from the upstream customer tiering API.
`migration_model`	No
`identity_cleaning`	Yes	What the server did to the customer identifiers before scoring: which spelling variants it merged by rule, which groups it deliberately left separate for YOU to rule on (review_candidates — read the rows and decide, then re-run with identity_overrides), how names were chosen for display, and the counts before and after. Always relay the merges and the open questions; the tiers depend on them.
`money_assumptions`	No
`data_quality_report`	No	Upstream customer tiering API payload.

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedOct 8, 2026

removedOutput schema / properties / feedback_prompt

Removed value: -{
-  "anyOf": [
-    {
-      "additionalProperties": false,
-      "properties": {
-        "message": {
-          "type": "string"
-        },
-        "must_ask": {
-          "type": "boolean"
-        },
-        "output_count": {
-          "type": "integer"
-        },
-        "reactions": {
-          "items": {
-            "additionalProperties": false,
-            "properties": {
-              "emoji": {
-                "type": "string"
-              },
-              "label": {
-                "type": "string"
-              },
-              "value": {
-                "type": "string"
-              }
-            },
-            "required": [
-              "value",
-              "emoji",
-              "label"
-            ],
-            "type": "object"
-          },
-          "type": "array"
-        },
-        "ready": {
-          "type": "boolean"
-        }
-      },
-      "required": [
-        "ready"
-      ],
-      "type": "object"
-    },
-    {
-      "type": "null"
-    }
-  ]
-}

removedOutput schema / properties / output_count

Removed value: -{
-  "anyOf": [
-    {
-      "type": "integer"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "description": "Successful scoring outputs since last feedback. Feedback is due at 3 and stays due until it is saved."
-}

Changed27 schema fields changedOct 5, 2026

addedInput schema / additionalProperties
```
Added value: +false
```

changedInput schema / properties / as_of / description

Previous value: -"Analysis date YYYY-MM-DD. Defaults to latest transaction date. Example: 2025-12-31."New value: +"Analysis date YYYY-MM-DD. Defaults to latest transaction date."

addedInput schema / properties / as_of / examples
```
Added value: +[
+  "2025-12-31"
+]
```
addedInput schema / properties / currency / examples
```
Added value: +[
+  "INR",
+  "USD",
+  "EUR"
+]
```
addedInput schema / properties / currency_symbol / examples
```
Added value: +[
+  "₹",
+  "$"
+]
```
addedInput schema / properties / identity_overrides / additionalProperties
```
Added value: +{
+  "type": "string"
+}
```

removedInput schema / properties / identity_overrides / items

Removed value: -{
-  "properties": {
-    "from_value": {
-      "type": "string"
-    },
-    "to_account": {
-      "type": "string"
-    }
-  },
-  "required": [
-    "from_value",
-    "to_account"
-  ],
-  "type": "object"
-}

changedInput schema / properties / identity_overrides / type
```
Previous value: -"array"New value: +"object"
```
addedInput schema / properties / rep_contacts / items / additionalProperties
```
Added value: +false
```

changedInput schema / properties / rep_contacts / items / properties / customer_id / description

Previous value: -"Must match a customer in transactions. Numeric codes must be sent as strings."New value: +"Must match a customer in transactions."

changedInput schema / properties / rep_contacts / items / properties / customer_id / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number"
+]
```
addedInput schema / properties / transactions / items / additionalProperties
```
Added value: +false
```
addedInput schema / properties / transactions / items / properties / amount / exclusiveMinimum
```
Added value: +0
```
removedInput schema / properties / transactions / items / properties / amount / minimum
```
Removed value: -0
```

changedInput schema / properties / transactions / items / properties / customer_id / description

Previous value: -"Customer identifier exactly as the source has it. Spelling, case, spacing and legal-suffix variants are merged server-side before scoring; do not normalise it yourself. Numeric codes must be sent as strings."New value: +"Customer identifier exactly as the source has it. Spelling, case, spacing and legal-suffix variants are merged server-side before scoring; do not normalise it yourself."

changedInput schema / properties / transactions / items / properties / customer_id / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number"
+]
```

addedOutput schema / properties / book_exposure / anyOf

Added value: +[
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / book_exposure / type
```
Removed value: -"object"
```

addedOutput schema / properties / feedback_prompt

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": false,
+      "properties": {
+        "message": {
+          "type": "string"
+        },
+        "must_ask": {
+          "type": "boolean"
+        },
+        "output_count": {
+          "type": "integer"
+        },
+        "reactions": {
+          "items": {
+            "additionalProperties": false,
+            "properties": {
+              "emoji": {
+                "type": "string"
+              },
+              "label": {
+                "type": "string"
+              },
+              "value": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "value",
+              "emoji",
+              "label"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        },
+        "ready": {
+          "type": "boolean"
+        }
+      },
+      "required": [
+        "ready"
+      ],
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

changedOutput schema / properties / message / type

Previous value: -"string"New value: +[
+  "string",
+  "null"
+]

addedOutput schema / properties / migration_model / anyOf

Added value: +[
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / migration_model / type
```
Removed value: -"object"
```

addedOutput schema / properties / money_assumptions / anyOf

Added value: +[
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / money_assumptions / type
```
Removed value: -"object"
```

addedOutput schema / properties / output_count

Added value: +{
+  "anyOf": [
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "description": "Successful scoring outputs since last feedback. Feedback is due at 3 and stays due until it is saved."
+}

addedOutput schema / properties / rep_queue / anyOf

Added value: +[
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / rep_queue / type
```
Removed value: -"object"
```

Changed25 schema fields changedSep 22, 2026

removedInput schema / additionalProperties
```
Removed value: -false
```

changedInput schema / properties / as_of / description

Previous value: -"Analysis date YYYY-MM-DD. Defaults to latest transaction date."New value: +"Analysis date YYYY-MM-DD. Defaults to latest transaction date. Example: 2025-12-31."

removedInput schema / properties / as_of / examples
```
Removed value: -[
-  "2025-12-31"
-]
```
removedInput schema / properties / currency / examples
```
Removed value: -[
-  "INR",
-  "USD",
-  "EUR"
-]
```
removedInput schema / properties / currency_symbol / examples
```
Removed value: -[
-  "₹",
-  "$"
-]
```
removedInput schema / properties / identity_overrides / additionalProperties
```
Removed value: -{
-  "type": "string"
-}
```

addedInput schema / properties / identity_overrides / items

Added value: +{
+  "properties": {
+    "from_value": {
+      "type": "string"
+    },
+    "to_account": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "from_value",
+    "to_account"
+  ],
+  "type": "object"
+}

changedInput schema / properties / identity_overrides / type
```
Previous value: -"object"New value: +"array"
```
removedInput schema / properties / rep_contacts / items / additionalProperties
```
Removed value: -false
```

changedInput schema / properties / rep_contacts / items / properties / customer_id / description

Previous value: -"Must match a customer in transactions."New value: +"Must match a customer in transactions. Numeric codes must be sent as strings."

changedInput schema / properties / rep_contacts / items / properties / customer_id / type
```
Previous value: -[
-  "string",
-  "number"
-]New value: +"string"
```
removedInput schema / properties / transactions / items / additionalProperties
```
Removed value: -false
```
removedInput schema / properties / transactions / items / properties / amount / exclusiveMinimum
```
Removed value: -0
```
addedInput schema / properties / transactions / items / properties / amount / minimum
```
Added value: +0
```

changedInput schema / properties / transactions / items / properties / customer_id / description

Previous value: -"Customer identifier exactly as the source has it. Spelling, case, spacing and legal-suffix variants are merged server-side before scoring; do not normalise it yourself."New value: +"Customer identifier exactly as the source has it. Spelling, case, spacing and legal-suffix variants are merged server-side before scoring; do not normalise it yourself. Numeric codes must be sent as strings."

changedInput schema / properties / transactions / items / properties / customer_id / type
```
Previous value: -[
-  "string",
-  "number"
-]New value: +"string"
```

removedOutput schema / properties / book_exposure / anyOf

Removed value: -[
-  {
-    "additionalProperties": true,
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / book_exposure / type
```
Added value: +"object"
```

changedOutput schema / properties / message / type

Previous value: -[
-  "string",
-  "null"
-]New value: +"string"

removedOutput schema / properties / migration_model / anyOf

Removed value: -[
-  {
-    "additionalProperties": true,
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / migration_model / type
```
Added value: +"object"
```

removedOutput schema / properties / money_assumptions / anyOf

Removed value: -[
-  {
-    "additionalProperties": true,
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / money_assumptions / type
```
Added value: +"object"
```

removedOutput schema / properties / rep_queue / anyOf

Removed value: -[
-  {
-    "additionalProperties": true,
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / rep_queue / type
```
Added value: +"object"
```

Changed25 schema fields changedSep 18, 2026

addedInput schema / additionalProperties
```
Added value: +false
```

changedInput schema / properties / as_of / description

Previous value: -"Analysis date YYYY-MM-DD. Defaults to latest transaction date. Example: 2025-12-31."New value: +"Analysis date YYYY-MM-DD. Defaults to latest transaction date."

addedInput schema / properties / as_of / examples
```
Added value: +[
+  "2025-12-31"
+]
```
addedInput schema / properties / currency / examples
```
Added value: +[
+  "INR",
+  "USD",
+  "EUR"
+]
```
addedInput schema / properties / currency_symbol / examples
```
Added value: +[
+  "₹",
+  "$"
+]
```
addedInput schema / properties / identity_overrides / additionalProperties
```
Added value: +{
+  "type": "string"
+}
```

removedInput schema / properties / identity_overrides / items

Removed value: -{
-  "properties": {
-    "from_value": {
-      "type": "string"
-    },
-    "to_account": {
-      "type": "string"
-    }
-  },
-  "required": [
-    "from_value",
-    "to_account"
-  ],
-  "type": "object"
-}

changedInput schema / properties / identity_overrides / type
```
Previous value: -"array"New value: +"object"
```
addedInput schema / properties / rep_contacts / items / additionalProperties
```
Added value: +false
```

changedInput schema / properties / rep_contacts / items / properties / customer_id / description

Previous value: -"Must match a customer in transactions. Numeric codes must be sent as strings."New value: +"Must match a customer in transactions."

changedInput schema / properties / rep_contacts / items / properties / customer_id / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number"
+]
```
addedInput schema / properties / transactions / items / additionalProperties
```
Added value: +false
```
addedInput schema / properties / transactions / items / properties / amount / exclusiveMinimum
```
Added value: +0
```
removedInput schema / properties / transactions / items / properties / amount / minimum
```
Removed value: -0
```

changedInput schema / properties / transactions / items / properties / customer_id / description

Previous value: -"Customer identifier exactly as the source has it. Spelling, case, spacing and legal-suffix variants are merged server-side before scoring; do not normalise it yourself. Numeric codes must be sent as strings."New value: +"Customer identifier exactly as the source has it. Spelling, case, spacing and legal-suffix variants are merged server-side before scoring; do not normalise it yourself."

changedInput schema / properties / transactions / items / properties / customer_id / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number"
+]
```

addedOutput schema / properties / book_exposure / anyOf

Added value: +[
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / book_exposure / type
```
Removed value: -"object"
```

changedOutput schema / properties / message / type

Previous value: -"string"New value: +[
+  "string",
+  "null"
+]

addedOutput schema / properties / migration_model / anyOf

Added value: +[
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / migration_model / type
```
Removed value: -"object"
```

addedOutput schema / properties / money_assumptions / anyOf

Added value: +[
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / money_assumptions / type
```
Removed value: -"object"
```

addedOutput schema / properties / rep_queue / anyOf

Added value: +[
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / rep_queue / type
```
Removed value: -"object"
```

Changed25 schema fields changedSep 17, 2026

removedInput schema / additionalProperties
```
Removed value: -false
```

changedInput schema / properties / as_of / description

Previous value: -"Analysis date YYYY-MM-DD. Defaults to latest transaction date."New value: +"Analysis date YYYY-MM-DD. Defaults to latest transaction date. Example: 2025-12-31."

removedInput schema / properties / as_of / examples
```
Removed value: -[
-  "2025-12-31"
-]
```
removedInput schema / properties / currency / examples
```
Removed value: -[
-  "INR",
-  "USD",
-  "EUR"
-]
```
removedInput schema / properties / currency_symbol / examples
```
Removed value: -[
-  "₹",
-  "$"
-]
```
removedInput schema / properties / identity_overrides / additionalProperties
```
Removed value: -{
-  "type": "string"
-}
```

addedInput schema / properties / identity_overrides / items

Added value: +{
+  "properties": {
+    "from_value": {
+      "type": "string"
+    },
+    "to_account": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "from_value",
+    "to_account"
+  ],
+  "type": "object"
+}

changedInput schema / properties / identity_overrides / type
```
Previous value: -"object"New value: +"array"
```
removedInput schema / properties / rep_contacts / items / additionalProperties
```
Removed value: -false
```

changedInput schema / properties / rep_contacts / items / properties / customer_id / description

Previous value: -"Must match a customer in transactions."New value: +"Must match a customer in transactions. Numeric codes must be sent as strings."

changedInput schema / properties / rep_contacts / items / properties / customer_id / type
```
Previous value: -[
-  "string",
-  "number"
-]New value: +"string"
```
removedInput schema / properties / transactions / items / additionalProperties
```
Removed value: -false
```
removedInput schema / properties / transactions / items / properties / amount / exclusiveMinimum
```
Removed value: -0
```
addedInput schema / properties / transactions / items / properties / amount / minimum
```
Added value: +0
```

changedInput schema / properties / transactions / items / properties / customer_id / description

Previous value: -"Customer identifier exactly as the source has it. Spelling, case, spacing and legal-suffix variants are merged server-side before scoring; do not normalise it yourself."New value: +"Customer identifier exactly as the source has it. Spelling, case, spacing and legal-suffix variants are merged server-side before scoring; do not normalise it yourself. Numeric codes must be sent as strings."

changedInput schema / properties / transactions / items / properties / customer_id / type
```
Previous value: -[
-  "string",
-  "number"
-]New value: +"string"
```

removedOutput schema / properties / book_exposure / anyOf

Removed value: -[
-  {
-    "additionalProperties": true,
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / book_exposure / type
```
Added value: +"object"
```

changedOutput schema / properties / message / type

Previous value: -[
-  "string",
-  "null"
-]New value: +"string"

removedOutput schema / properties / migration_model / anyOf

Removed value: -[
-  {
-    "additionalProperties": true,
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / migration_model / type
```
Added value: +"object"
```

removedOutput schema / properties / money_assumptions / anyOf

Removed value: -[
-  {
-    "additionalProperties": true,
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / money_assumptions / type
```
Added value: +"object"
```

removedOutput schema / properties / rep_queue / anyOf

Removed value: -[
-  {
-    "additionalProperties": true,
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / rep_queue / type
```
Added value: +"object"
```

Changed6 schema fields changedSep 1, 2026

addedInput schema / properties / identity_overrides

Added value: +{
+  "additionalProperties": {
+    "type": "string"
+  },
+  "description": "Your judgement calls on the review_candidates a previous call reported: {raw or reported customer value -> the account it belongs to}. Spelling variants are merged automatically and need no entry here; use this only for groups the rules deliberately left separate, and only after reading the surrounding rows or asking the user.",
+  "type": "object"
+}

changedInput schema / properties / transactions / description

Previous value: -"Raw purchase rows. Each item needs customer_id, date, and amount (> 0, finite)."New value: +"Purchase rows. Each item needs customer_id, date, and amount (> 0, finite). Send customer_id exactly as the source has it: capitalisation, spacing, punctuation, legal-suffix and word-order variants are merged here by rule. Do not pre-normalise. Add customer_name when the source has a name as well as a code."

changedInput schema / properties / transactions / items / properties / customer_id / description

Previous value: -"Stable customer identifier."New value: +"Customer identifier exactly as the source has it. Spelling, case, spacing and legal-suffix variants are merged server-side before scoring; do not normalise it yourself."

addedInput schema / properties / transactions / items / properties / customer_name

Added value: +{
+  "description": "Optional readable name for this account, when customer_id is a code. Used only to label the account in the result — grouping still happens on customer_id. Send it whenever the source has both, so the answer names accounts the way the user does.",
+  "type": "string"
+}

addedOutput schema / properties / identity_cleaning

Added value: +{
+  "additionalProperties": true,
+  "description": "What the server did to the customer identifiers before scoring: which spelling variants it merged by rule, which groups it deliberately left separate for YOU to rule on (review_candidates — read the rows and decide, then re-run with identity_overrides), how names were chosen for display, and the counts before and after. Always relay the merges and the open questions; the tiers depend on them.",
+  "type": "object"
+}

changedOutput schema / required

Previous value: -[
-  "status",
-  "decisions",
-  "customers",
-  "rep_queue"
-]New value: +[
+  "status",
+  "decisions",
+  "customers",
+  "rep_queue",
+  "identity_cleaning"
+]

First observedAug 13, 2026

TDQS

A4.8/5.0

Behavior5/5

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

Annotations already declare readOnlyHint=true and destructiveHint=false, and the description adds substantial behavioral context beyond that: ID variants are merged server-side by rule, ambiguous identities are surfaced unmerged in review_candidates, rep_contacts learning is 'observational, not causal', and full result includes per-customer ledgers with explanation traces. No contradiction with annotations.

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 description is long but every paragraph earns its place: core action, size limit and sibling routing, optional rep_contacts, and the identity-cleaning workflow are all present. Some instructions repeat the schema (e.g., 'do not pre-normalise'), but the repetition is intentional emphasis rather than filler.

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 tool with 16 parameters, nested objects, and an output schema, the description is unusually complete. It covers the pipeline, the boundary condition for the sibling tool, the identity-cleaning model the agent must understand, and where ambiguous cases surface. The output schema covers return values, so further return-format detail is unnecessary.

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 coverage is 100%, so the baseline is 3. The description adds meaningful semantics for key parameters: rep_contacts learns uplift from data rather than assuming it, transaction customer_id must be sent exactly as sourced without pre-normalisation, customer_name is only for reporting labels, and identity_overrides is for judgement calls on review_candidates. This elevates it above baseline.

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 opens with a specific verb and resource: 'Scores a customer book of 500 transaction rows OR FEWER into A/B/C/D tiers.' It names the exact models run and what is returned (per-customer ledger with explanation traces), and it clearly distinguishes itself from the sibling by the 500-row boundary.

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?

Explicit when-to-use guidance is present: 'For books LARGER than 500 rows use customer_tiering_get_engine instead — sending thousands of rows as tool arguments is slow and risks truncated JSON.' It also tells agents not to pre-normalise identifiers and to use identity_overrides only after judging review_candidates, which prevents misuse.

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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