Agent Central

Days of cover

get_days_of_cover

Read-only

Use for per-ASIN/per-FBA-SKU replenishment coverage: days of stock remaining computed from FBA fulfillable + FBA inbound divided by recent FBA sales velocity. Uses completed Sales & Traffic Business Reports when every due date in the lookback is loaded (the newest dates inside Amazon's finalization lag are reported as not yet due and excluded from the velocity average); when initial Business Report backfill is incomplete and the lookback is 7/30/60/90 days, uses Amazon FBA Inventory Health shipped-unit velocity as a source-attributed fallback and surfaces the sales-history data gap. AWD on-hand is reported as its own field but excluded from the cover numerator (AWD is upstream of FBA, not directly fulfillable). Sorted by lowest cover first. Do not use for raw stock counts, aged inventory fees, or broad triage; use get_fba_inventory/get_inventory_health/get_inventory_risk_triage.

Input Schema

Name	Required	Description	Default
`sku`	No	Filter by SKU
`asin`	No	Filter by ASIN
`limit`	No	Max rows (1-1000, default 20).
`offset`	No	Pagination offset (0-100000, default 0). Use the returned pagination.next_offset to continue.
`sort_order`	No	Sort order (default: asc — most urgent first)	asc
`include_raw_rows`	No	For tabular results, false returns compact rows capped at MCP_TEXT_ROW_PREVIEW_LIMIT (default 10), regardless of limit. Complete-page and custom non-tabular responses may ignore this option; see tool-specific notes. Default true; large full-row responses are capped separately. Freshness fields require include_diagnostics=true in either row mode, where supported.
`max_days_of_cover`	No	Only show ASINs with at most this many days of cover
`min_days_of_cover`	No	Only show ASINs with at least this many days of cover
`include_diagnostics`	No	True enables expanded freshness diagnostics. Where supported, snapshot_capture_at and snapshot_data_through_date are populated only when include_diagnostics=true, in both compact and full-row modes; values may still be null if source data is unavailable. Default false. Basic empty-result data-window diagnostics are included by default when available.
`sales_lookback_days`	No	Number of days to look back for sales velocity (default 30)

Output Schema

Name	Required	Description	Default
`evidence`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed29 schema fields changedNov 7, 2026

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

changedOutput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

changedOutput schema / additionalProperties
```
Previous value: -trueNew value: +{}
```
removedOutput schema / properties / evidence / properties / effective_scope / $ref
```
Removed value: -"#/properties/evidence/properties/requested_scope"
```
addedOutput schema / properties / evidence / properties / effective_scope / additionalProperties
```
Added value: +false
```

addedOutput schema / properties / evidence / properties / effective_scope / properties

Added value: +{
+  "end_date": {
+    "anyOf": [
+      {
+        "format": "date",
+        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))$",
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  },
+  "filters": {
+    "additionalProperties": {},
+    "propertyNames": {
+      "type": "string"
+    },
+    "type": "object"
+  },
+  "group_by": {
+    "items": {
+      "maxLength": 128,
+      "minLength": 1,
+      "type": "string"
+    },
+    "type": "array"
+  },
+  "marketplace_id": {
+    "anyOf": [
+      {
+        "minLength": 1,
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  },
+  "reporting_time_zone": {
+    "anyOf": [
+      {
+        "minLength": 1,
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  },
+  "sort": {
+    "items": {
+      "additionalProperties": false,
+      "properties": {
+        "direction": {
+          "enum": [
+            "asc",
+            "desc"
+          ],
+          "type": "string"
+        },
+        "field": {
+          "maxLength": 128,
+          "minLength": 1,
+          "type": "string"
+        }
+      },
+      "required": [
+        "field",
+        "direction"
+      ],
+      "type": "object"
+    },
+    "type": "array"
+  },
+  "start_date": {
+    "anyOf": [
+      {
+        "format": "date",
+        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))$",
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  }
+}

addedOutput schema / properties / evidence / properties / effective_scope / required

Added value: +[
+  "marketplace_id",
+  "start_date",
+  "end_date",
+  "reporting_time_zone",
+  "group_by",
+  "sort",
+  "filters"
+]

addedOutput schema / properties / evidence / properties / effective_scope / type
```
Added value: +"object"
```
removedOutput schema / properties / evidence / properties / grain / items / $ref
```
Removed value: -"#/properties/evidence/properties/tool"
```
addedOutput schema / properties / evidence / properties / grain / items / maxLength
```
Added value: +128
```
addedOutput schema / properties / evidence / properties / grain / items / minLength
```
Added value: +1
```
addedOutput schema / properties / evidence / properties / grain / items / type
```
Added value: +"string"
```
removedOutput schema / properties / evidence / properties / join_keys / items / properties / field / $ref
```
Removed value: -"#/properties/evidence/properties/tool"
```
addedOutput schema / properties / evidence / properties / join_keys / items / properties / field / maxLength
```
Added value: +128
```
addedOutput schema / properties / evidence / properties / join_keys / items / properties / field / minLength
```
Added value: +1
```
addedOutput schema / properties / evidence / properties / join_keys / items / properties / field / type
```
Added value: +"string"
```

changedOutput schema / properties / evidence / properties / observed / properties / data_start / anyOf

Previous value: -[
-  {
-    "format": "date",
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "format": "date",
+    "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))$",
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

changedOutput schema / properties / evidence / properties / observed / properties / data_through / anyOf

Previous value: -[
-  {
-    "format": "date",
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "format": "date",
+    "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))$",
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

changedOutput schema / properties / evidence / properties / requested_scope / properties / end_date / anyOf

Previous value: -[
-  {
-    "format": "date",
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "format": "date",
+    "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))$",
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

addedOutput schema / properties / evidence / properties / requested_scope / properties / filters / propertyNames
```
Added value: +{
+  "type": "string"
+}
```
removedOutput schema / properties / evidence / properties / requested_scope / properties / group_by / items / $ref
```
Removed value: -"#/properties/evidence/properties/tool"
```
addedOutput schema / properties / evidence / properties / requested_scope / properties / group_by / items / maxLength
```
Added value: +128
```
addedOutput schema / properties / evidence / properties / requested_scope / properties / group_by / items / minLength
```
Added value: +1
```
addedOutput schema / properties / evidence / properties / requested_scope / properties / group_by / items / type
```
Added value: +"string"
```
removedOutput schema / properties / evidence / properties / requested_scope / properties / sort / items / properties / field / $ref
```
Removed value: -"#/properties/evidence/properties/tool"
```
addedOutput schema / properties / evidence / properties / requested_scope / properties / sort / items / properties / field / maxLength
```
Added value: +128
```
addedOutput schema / properties / evidence / properties / requested_scope / properties / sort / items / properties / field / minLength
```
Added value: +1
```
addedOutput schema / properties / evidence / properties / requested_scope / properties / sort / items / properties / field / type
```
Added value: +"string"
```

changedOutput schema / properties / evidence / properties / requested_scope / properties / start_date / anyOf

Previous value: -[
-  {
-    "format": "date",
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "format": "date",
+    "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))$",
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

Changed2 schema fields changedOct 27, 2026

changedInput schema / properties / include_diagnostics / description

Previous value: -"True may add expanded freshness diagnostics. Basic empty-result data-window diagnostics are included by default when available."New value: +"True enables expanded freshness diagnostics. Where supported, snapshot_capture_at and snapshot_data_through_date are populated only when include_diagnostics=true, in both compact and full-row modes; values may still be null if source data is unavailable. Default false. Basic empty-result data-window diagnostics are included by default when available."

changedInput schema / properties / include_raw_rows / description

Previous value: -"False returns compact rows. Default true."New value: +"For tabular results, false returns compact rows capped at MCP_TEXT_ROW_PREVIEW_LIMIT (default 10), regardless of limit. Complete-page and custom non-tabular responses may ignore this option; see tool-specific notes. Default true; large full-row responses are capped separately. Freshness fields require include_diagnostics=true in either row mode, where supported."

Changed5 schema fields changedOct 27, 2026

changedOutput schema / properties / evidence / properties / basis / properties / date / items / enum

Previous value: -[
-  "order_date",
-  "reporting_date",
-  "click_attribution_date",
-  "posted_date",
-  "settlement_date",
-  "snapshot_date",
-  "live_observation_time",
-  "event_time",
-  "effective_date",
-  "not_applicable",
-  "not_reported"
-]New value: +[
+  "order_date",
+  "reporting_date",
+  "click_attribution_date",
+  "posted_date",
+  "financial_event_group_start",
+  "settlement_date",
+  "snapshot_date",
+  "live_observation_time",
+  "event_time",
+  "effective_date",
+  "not_applicable",
+  "not_reported"
+]

changedOutput schema / properties / evidence / properties / entity_types / items / enum

Previous value: -[
-  "account",
-  "marketplace",
-  "product",
-  "variation_family",
-  "listing",
-  "offer",
-  "inventory_item",
-  "fulfillment_center",
-  "order",
-  "order_item",
-  "campaign",
-  "ad_group",
-  "ad",
-  "target",
-  "keyword",
-  "search_query",
-  "portfolio",
-  "store",
-  "audience_segment",
-  "dsp_advertiser",
-  "shipment",
-  "inbound_plan",
-  "fulfillment_operation",
-  "transaction",
-  "settlement",
-  "financial_event",
-  "return",
-  "reimbursement",
-  "promotion",
-  "review",
-  "catalog_definition",
-  "audit_event",
-  "not_applicable"
-]New value: +[
+  "account",
+  "marketplace",
+  "product",
+  "variation_family",
+  "listing",
+  "offer",
+  "inventory_item",
+  "fulfillment_center",
+  "order",
+  "order_item",
+  "campaign",
+  "ad_group",
+  "ad",
+  "target",
+  "keyword",
+  "search_query",
+  "portfolio",
+  "store",
+  "audience_segment",
+  "dsp_advertiser",
+  "shipment",
+  "inbound_plan",
+  "fulfillment_operation",
+  "transaction",
+  "settlement",
+  "financial_event",
+  "financial_event_group",
+  "return",
+  "reimbursement",
+  "promotion",
+  "review",
+  "catalog_definition",
+  "audit_event",
+  "not_applicable"
+]

changedOutput schema / properties / evidence / properties / join_keys / items / properties / entity_type / enum

Previous value: -[
-  "account",
-  "marketplace",
-  "product",
-  "variation_family",
-  "listing",
-  "offer",
-  "inventory_item",
-  "fulfillment_center",
-  "order",
-  "order_item",
-  "campaign",
-  "ad_group",
-  "ad",
-  "target",
-  "keyword",
-  "search_query",
-  "portfolio",
-  "store",
-  "audience_segment",
-  "dsp_advertiser",
-  "shipment",
-  "inbound_plan",
-  "fulfillment_operation",
-  "transaction",
-  "settlement",
-  "financial_event",
-  "return",
-  "reimbursement",
-  "promotion",
-  "review",
-  "catalog_definition",
-  "audit_event",
-  "not_applicable"
-]New value: +[
+  "account",
+  "marketplace",
+  "product",
+  "variation_family",
+  "listing",
+  "offer",
+  "inventory_item",
+  "fulfillment_center",
+  "order",
+  "order_item",
+  "campaign",
+  "ad_group",
+  "ad",
+  "target",
+  "keyword",
+  "search_query",
+  "portfolio",
+  "store",
+  "audience_segment",
+  "dsp_advertiser",
+  "shipment",
+  "inbound_plan",
+  "fulfillment_operation",
+  "transaction",
+  "settlement",
+  "financial_event",
+  "financial_event_group",
+  "return",
+  "reimbursement",
+  "promotion",
+  "review",
+  "catalog_definition",
+  "audit_event",
+  "not_applicable"
+]

changedOutput schema / properties / evidence / properties / join_keys / items / properties / role / enum

Previous value: -[
-  "account_id",
-  "marketplace_id",
-  "asin",
-  "advertised_asin",
-  "purchased_asin",
-  "child_asin",
-  "parent_asin",
-  "seller_sku",
-  "fnsku",
-  "order_id",
-  "order_item_id",
-  "campaign_id",
-  "ad_group_id",
-  "ad_id",
-  "target_id",
-  "keyword_id",
-  "search_query",
-  "portfolio_id",
-  "shipment_id",
-  "inbound_plan_id",
-  "operation_id",
-  "transaction_id",
-  "settlement_id",
-  "promotion_id",
-  "not_applicable"
-]New value: +[
+  "account_id",
+  "marketplace_id",
+  "asin",
+  "advertised_asin",
+  "purchased_asin",
+  "child_asin",
+  "parent_asin",
+  "seller_sku",
+  "fnsku",
+  "order_id",
+  "order_item_id",
+  "campaign_id",
+  "ad_group_id",
+  "ad_id",
+  "target_id",
+  "keyword_id",
+  "search_query",
+  "portfolio_id",
+  "shipment_id",
+  "inbound_plan_id",
+  "operation_id",
+  "transaction_id",
+  "financial_event_group_id",
+  "settlement_id",
+  "promotion_id",
+  "not_applicable"
+]

changedOutput schema / properties / evidence / properties / metric_families / items / enum

Previous value: -[
-  "sales",
-  "traffic",
-  "advertising",
-  "inventory",
-  "returns",
-  "reimbursements",
-  "fees",
-  "profitability",
-  "catalog",
-  "rank",
-  "fulfillment",
-  "pricing",
-  "promotions",
-  "reviews",
-  "audit",
-  "availability",
-  "not_applicable"
-]New value: +[
+  "sales",
+  "traffic",
+  "advertising",
+  "inventory",
+  "returns",
+  "reimbursements",
+  "payouts",
+  "fees",
+  "profitability",
+  "catalog",
+  "rank",
+  "fulfillment",
+  "pricing",
+  "promotions",
+  "reviews",
+  "audit",
+  "availability",
+  "not_applicable"
+]

AddedOct 7, 2026

TDQS

A4.8/5.0

Behavior5/5

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

Both annotations and the description agree the tool is read-only: readOnlyHint and destructiveHint are set, and the operation only reads. Beyond that, the description adds real behavioral detail the annotations do not cover. It describes the fallback data source and its trigger (incomplete Business Report backfill at 7/30/60/90-day lookbacks, using Amazon FBA Inventory Health shipped-unit velocity with the gap surfaced), the finalization-lag exclusion from the velocity average, and the rule that AWD on-hand appears as its own field but is excluded from the numerator. Together these let the agent interpret partial or shifted results correctly.

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 definition is front-loaded with the core formula and scope before the data-source caveats and the exclusions at the end, so an agent reading top-down gets what it needs first. It is dense, though. The long parenthetical about finalization lag and the multi-clause fallback sentence could be split into shorter statements without losing meaning.

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?

The tool is fairly complex, with a derived metric, multiple source systems, fallback logic, and 10 parameters, and the description covers the parts that would otherwise mislead: how cover is computed, when velocity comes from a fallback source, how AWD is treated, and how results are ordered. An output schema is present, so return-value documentation is not required here.

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 3 would already be the baseline. The description still adds meaning: it explains which sales_lookback_days values (7/30/60/90) trigger the fallback source, states the default result order is lowest cover first (which maps to sort_order asc), and shows that cover is scoped per ASIN/SKU, so min/max_days_of_cover filter that derived metric. Fields such as include_raw_rows and include_diagnostics are left to their schema text.

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 names a specific verb and resource (per-ASIN/per-FBA-SKU replenishment coverage, days of stock remaining) and spells out the exact numerator and denominator: FBA fulfillable plus FBA inbound divided by recent FBA sales velocity. That level of specificity clearly separates it from sibling inventory tools such as get_fba_inventory and get_inventory_health.

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?

It gives explicit when-to-use guidance, tied to replenishment coverage, and explicit when-not-to-use guidance with three named alternatives (get_fba_inventory, get_inventory_health, get_inventory_risk_triage) for raw stock counts, aged inventory fees, and broad triage. The agent does not have to infer which sibling to pick.

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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