reference-data

list_series

Read-onlyIdempotent

FREE. Catalog of all mearef reference-data series: supported countries, series ids, descriptions, freshness metadata and per-series URLs. Call this first to discover what data exists. Paid answer tools accept receipt=true (included in the answer price, no extra USDC) and, on a paid success, return an Ed25519 answer receipt (kind answer_receipt). That receipt is not a series certified extract and is not legal advice. Series certified extracts are GET /v1/certified/{country}/{series} at $0.10 and are not an MCP tool. Verify a receipt with verify_answer_receipt (free, public key only) against /certified/public-key. get_changes is free. get_calendar is free. register_alert registration is free.

Input Schema

Name	Required	Description	Default
`detail`	No	Default false. Without country, false returns a compact index (country -> series ids). true returns the full catalog, which is large.
`country`	No	Optional ISO country code. Returns full per-series metadata (source, freshness, bands) for that country only.

Output Schema

Name	Required	Description
`note`	No
`error`	No	Present on a free refusal or error; no charge
`countries`	No	Country entries ({country, name, series}); on an unknown-country refusal, the list of valid codes
`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.

Changed1 schema field changedOct 13, 2026

changedOutput schema / description

Previous value: -"Catalog: brand metadata plus countries[] (compact: country, name, series ids; with country or detail: full per-series metadata)"New value: +"Catalog: brand metadata plus countries[] (compact: country, name, series ids; with country or detail: full per-series metadata including confidence_label and coverage_label)"

Changed1 schema field changedOct 12, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": {},
+  "description": "Catalog: brand metadata plus countries[] (compact: country, name, series ids; with country or detail: full per-series metadata)",
+  "properties": {
+    "bind_series": {},
+    "countries": {
+      "description": "Country entries ({country, name, series}); on an unknown-country refusal, the list of valid codes",
+      "items": {},
+      "type": "array"
+    },
+    "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"
+    },
+    "note": {
+      "type": "string"
+    },
+    "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"
+}

Changed2 schema fields changedOct 12, 2026

addedInput schema / properties / country

Added value: +{
+  "description": "Optional ISO country code. Returns full per-series metadata (source, freshness, bands) for that country only.",
+  "type": "string"
+}

addedInput schema / properties / detail

Added value: +{
+  "description": "Default false. Without country, false returns a compact index (country -> series ids). true returns the full catalog, which is large.",
+  "type": "boolean"
+}

First observedJul 24, 2026

TDQS

A3.9/5.0

Behavior4/5

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

Annotations already declare readOnly/idempotent/non-destructive, so the bar is lower, yet the description adds real value by labeling the call 'FREE' and clarifying cost semantics. The receipt/Ed25519/certified-extract paragraphs are largely about other tools and don't describe this tool's own behavior.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness2/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded purpose is good, but the tail is padding: 'get_changes is free. get_calendar is free. register_alert registration is free.' plus certified-extract and receipt explanations do not help an agent invoke list_series and crowd out the core message.

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?

An output schema exists, so return values need not be explained, and the description plus schema fully cover how to call it. The only shortfall is that relevant routing (vs get_series) is omitted while irrelevant receipt details are included.

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?

Schema coverage is 100%, so both 'detail' and 'country' are fully documented in the schema. The description adds no syntax or format detail beyond it, making the baseline 3 correct.

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?

States a specific verb+resource ('Catalog of all mearef reference-data series') and enumerates the returned fields (countries, series ids, descriptions, freshness, URLs), which distinguishes it from get_series/get_series_history. 'Call this first to discover what data exists' further anchors its role.

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?

Explicit 'Call this first' gives a clear sequencing rule, and it names verify_answer_receipt as the follow-on for receipts. However, it never states when to prefer get_series over this tool, and much of the routing text concerns paid answer/receipt mechanics rather than this catalog tool.

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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