reference-data

get_snapshot

Read-onlyIdempotent

PAID ($0.02). Snapshot of every series for every country in one call. Pass api_key if you have one (instant card checkout at /pricing); otherwise the response explains how to pay via x402. Every JP series is free to try. After a 200, bind get_changes (free poll) or register_alert (HMAC push; Register: $0 · Delivery after trial: $0.05) on this series so a later gazette does not silently retire the value.

Input Schema

Name	Required	Description	Default
`api_key`	No	API key

Output Schema

Name	Required	Description
`error`	No	Present on a free refusal or error; no charge
`result`	No	One entry per country; every series value carries confidence_label, coverage_label and label_basis
`countries`	No
`no_charge`	No
`price_usd`	No
`disclaimer`	No
`how_to_pay`	No
`bind_series`	No
`explanation`	No
`x_next_bind`	No
`http_endpoint`	No
`payment_required`	No	true when the call needs payment; how_to_pay explains x402 or card

Schema Changelog

Changes observed during successful MCP inspections.

Changed4 schema fields changedOct 17, 2026
- removedOutput schema / properties / result / items / properties / series / items / properties / label_basis / properties / source_type / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / result / items / properties / series / items / properties / label_basis / properties / source_type / type
```
Added value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / result / items / properties / series / items / properties / label_basis / properties / verification_age_days / anyOf
```
Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / result / items / properties / series / items / properties / label_basis / properties / verification_age_days / type
```
Added value: +[
+  "number",
+  "null"
+]
```

Changed1 schema field changedOct 13, 2026

addedOutput schema / properties / result

Added value: +{
+  "description": "One entry per country; every series value carries confidence_label, coverage_label and label_basis",
+  "items": {
+    "additionalProperties": {},
+    "properties": {
+      "country": {
+        "type": "string"
+      },
+      "series": {
+        "items": {
+          "additionalProperties": {},
+          "properties": {
+            "confidence": {},
+            "confidence_label": {
+              "description": "Evidence verdict derived from source type, verification age and the stale flag (answers: the weakest series read). Rules at /label-rules",
+              "enum": [
+                "high",
+                "medium",
+                "low"
+              ],
+              "type": "string"
+            },
+            "country": {
+              "type": "string"
+            },
+            "coverage_label": {
+              "description": "How much of the question is covered: ready = complete; partial = held with a disclosed limitation or default; gap = no number served. Rules at /label-rules",
+              "enum": [
+                "ready",
+                "partial",
+                "gap"
+              ],
+              "type": "string"
+            },
+            "effective_from": {},
+            "label_basis": {
+              "additionalProperties": {},
+              "description": "Inputs and the rule ids that produced the two labels",
+              "properties": {
+                "confidence_reasons": {
+                  "items": {
+                    "type": "string"
+                  },
+                  "type": "array"
+                },
+                "coverage_reasons": {
+                  "items": {
+                    "type": "string"
+                  },
+                  "type": "array"
+                },
+                "inputs": {
+                  "items": {},
+                  "type": "array"
+                },
+                "rules": {
+                  "type": "string"
+                },
+                "rules_version": {
+                  "type": "string"
+                },
+                "source_type": {
+                  "anyOf": [
+                    {
+                      "type": "string"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                },
+                "stale": {
+                  "type": "boolean"
+                },
+                "verification_age_days": {
+                  "anyOf": [
+                    {
+                      "type": "number"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                }
+              },
+              "type": "object"
+            },
+            "last_confirmed": {},
+            "notes": {},
+            "series": {
+              "type": "string"
+            },
+            "source": {},
+            "stale": {
+              "type": "boolean"
+            },
+            "unit": {},
+            "value": {}
+          },
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Changed1 schema field changedOct 12, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": {},
+  "description": "Every series for every country of this brand",
+  "properties": {
+    "bind_series": {},
+    "countries": {},
+    "disclaimer": {},
+    "error": {
+      "description": "Present on a free refusal or error; no charge"
+    },
+    "explanation": {},
+    "how_to_pay": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "http_endpoint": {
+      "type": "string"
+    },
+    "no_charge": {
+      "type": "boolean"
+    },
+    "payment_required": {
+      "description": "true when the call needs payment; how_to_pay explains x402 or card",
+      "type": "boolean"
+    },
+    "price_usd": {
+      "type": "number"
+    },
+    "x_next_bind": {}
+  },
+  "type": "object"
+}

First observedJul 20, 2026

TDQS

A3.9/5.0

Behavior4/5

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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, openWorld), so the description earns credit for adding cost ($0.02), the payment mechanism, a free-tier caveat, and post-success follow-up behavior. These are real traits absent from the structured fields. The follow-up sentence is somewhat cryptic ('silently retire the value'), leaving the consequence slightly fuzzy.

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?

Front-loads the most decision-relevant fact, 'PAID ($0.02)', which is exactly the right ordering. It stays compact for the amount of pricing and follow-up information it carries, though the final sentence is dense and mixes two distinct follow-up mechanisms.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With a rich annotation set, a fully documented single parameter, and an output schema (so return values need not be explained), the description covers the remaining gaps: cost, payment, trial scope, and next steps. Little an agent needs for correct invocation is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Only one parameter and schema coverage is 100%, so the schema already documents api_key. The description adds only the conditional 'if you have one', which does not extend the schema's meaning. Baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a concrete resource and scope: 'Snapshot of every series for every country in one call.' That clearly separates it from narrower siblings like get_series and list_series, though it never names those alternatives explicitly. A specific verb is implied rather than stated, which keeps it just below the top mark.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives a clear path for both cases: pass api_key if you have one, otherwise the response explains x402 payment, plus a free JP trial. It also tells the agent what to do after a 200 (bind get_changes or register_alert). It stops short of stating when NOT to use this versus the per-series siblings.

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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