Gate News MCP

news_prediction_get_volume_delta_ranking

Read-onlyIdempotent

[Read] Daily venue/overall ranking by volume delta (UTC rank_date). Optional venue[], category (exact term on rank index), status (active/closed/resolved/all; default active). Requires opensearch.predictionRankIndex. Read-only public research data. No account access, no order placement or fund transfers. Not investment advice.

Input Schema

TableJSON Schema

Name	Required	Description
`limit`	No	Page size; default 20, max 100.
`venue`	No	Optional venue filter. Allowed: polymarket, predict_fun.
`status`	No	Optional status filter on rank index. Allowed: active, closed, resolved, all. Defaults to active.
`category`	No	Optional category filter: exact term on rank index field category; omit or all to disable.
`date_utc`	No	UTC date in YYYY-MM-DD. Defaults to today_utc.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`overall`	Yes
`partial`	Yes
`by_venue`	Yes
`duration_ms`	Yes
`generated_at`	Yes
`rank_date_utc`	Yes
`missing_sources`	Yes
`excluded_reasons`	Yes
`source_data_status`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed48 schema fields changedAug 27, 2026
- addedInput schema / additionalProperties
```
Added value: +false
```
- changedInput schema / properties / limit / type
```
Previous value: -"integer"New value: +[
+  "null",
+  "integer"
+]
```
- changedInput schema / properties / venue / type
```
Previous value: -"array"New value: +[
+  "null",
+  "array"
+]
```
- addedOutput schema / additionalProperties
```
Added value: +false
```
- addedOutput schema / properties / by_venue / additionalProperties / items / additionalProperties
```
Added value: +false
```
- changedOutput schema / properties / by_venue / additionalProperties / items / properties / excluded_reasons / type
```
Previous value: -"array"New value: +[
+  "null",
+  "array"
+]
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / latest_mid_probability / description
```
Added value: +"nullable"
```
- removedOutput schema / properties / by_venue / additionalProperties / items / properties / latest_mid_probability / oneOf
```
Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / latest_mid_probability / type
```
Added value: +[
+  "null",
+  "number"
+]
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / lead_market_id / description
```
Added value: +"nullable"
```
- removedOutput schema / properties / by_venue / additionalProperties / items / properties / lead_market_id / oneOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / lead_market_id / type
```
Added value: +[
+  "null",
+  "string"
+]
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / market_name / description
```
Added value: +"nullable"
```
- removedOutput schema / properties / by_venue / additionalProperties / items / properties / market_name / oneOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / market_name / type
```
Added value: +[
+  "null",
+  "string"
+]
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / open_mid_probability_utc / description
```
Added value: +"nullable"
```
- removedOutput schema / properties / by_venue / additionalProperties / items / properties / open_mid_probability_utc / oneOf
```
Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / open_mid_probability_utc / type
```
Added value: +[
+  "null",
+  "number"
+]
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / probability_delta_today / description
```
Added value: +"nullable"
```
- removedOutput schema / properties / by_venue / additionalProperties / items / properties / probability_delta_today / oneOf
```
Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / probability_delta_today / type
```
Added value: +[
+  "null",
+  "number"
+]
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / volume_delta_usd_today / description
```
Added value: +"nullable"
```
- removedOutput schema / properties / by_venue / additionalProperties / items / properties / volume_delta_usd_today / oneOf
```
Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / volume_delta_usd_today / type
```
Added value: +[
+  "null",
+  "number"
+]
```
- changedOutput schema / properties / by_venue / additionalProperties / type
```
Previous value: -"array"New value: +[
+  "null",
+  "array"
+]
```
- changedOutput schema / properties / excluded_reasons / type
```
Previous value: -"array"New value: +[
+  "null",
+  "array"
+]
```
- changedOutput schema / properties / missing_sources / type
```
Previous value: -"array"New value: +[
+  "null",
+  "array"
+]
```
- addedOutput schema / properties / overall / items / additionalProperties
```
Added value: +false
```
- changedOutput schema / properties / overall / items / properties / excluded_reasons / type
```
Previous value: -"array"New value: +[
+  "null",
+  "array"
+]
```
- addedOutput schema / properties / overall / items / properties / latest_mid_probability / description
```
Added value: +"nullable"
```
- removedOutput schema / properties / overall / items / properties / latest_mid_probability / oneOf
```
Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / overall / items / properties / latest_mid_probability / type
```
Added value: +[
+  "null",
+  "number"
+]
```
- addedOutput schema / properties / overall / items / properties / lead_market_id / description
```
Added value: +"nullable"
```
- removedOutput schema / properties / overall / items / properties / lead_market_id / oneOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / overall / items / properties / lead_market_id / type
```
Added value: +[
+  "null",
+  "string"
+]
```
- addedOutput schema / properties / overall / items / properties / market_name / description
```
Added value: +"nullable"
```
- removedOutput schema / properties / overall / items / properties / market_name / oneOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / overall / items / properties / market_name / type
```
Added value: +[
+  "null",
+  "string"
+]
```
- addedOutput schema / properties / overall / items / properties / open_mid_probability_utc / description
```
Added value: +"nullable"
```
- removedOutput schema / properties / overall / items / properties / open_mid_probability_utc / oneOf
```
Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / overall / items / properties / open_mid_probability_utc / type
```
Added value: +[
+  "null",
+  "number"
+]
```
- addedOutput schema / properties / overall / items / properties / probability_delta_today / description
```
Added value: +"nullable"
```
- removedOutput schema / properties / overall / items / properties / probability_delta_today / oneOf
```
Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / overall / items / properties / probability_delta_today / type
```
Added value: +[
+  "null",
+  "number"
+]
```
- addedOutput schema / properties / overall / items / properties / volume_delta_usd_today / description
```
Added value: +"nullable"
```
- removedOutput schema / properties / overall / items / properties / volume_delta_usd_today / oneOf
```
Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / overall / items / properties / volume_delta_usd_today / type
```
Added value: +[
+  "null",
+  "number"
+]
```
- changedOutput schema / properties / overall / type
```
Previous value: -"array"New value: +[
+  "null",
+  "array"
+]
```
Changed28 schema fields changedMay 20, 2026
- changedInput schema / properties / category / description
```
Previous value: -"Optional category filter. Free text exact match against index field category; use all/empty to disable category filter."New value: +"Optional category filter: exact term on rank index field category; omit or all to disable."
```
- changedInput schema / properties / status / description
```
Previous value: -"Optional status filter. Allowed: active, closed, resolved, all. Defaults to active."New value: +"Optional status filter on rank index. Allowed: active, closed, resolved, all. Defaults to active."
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / latest_mid_probability / oneOf
```
Added value: +[
+  {
+    "type": "number"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / by_venue / additionalProperties / items / properties / latest_mid_probability / type
```
Removed value: -"number"
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / lead_market_id / oneOf
```
Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / by_venue / additionalProperties / items / properties / lead_market_id / type
```
Removed value: -"string"
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / market_name / oneOf
```
Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / by_venue / additionalProperties / items / properties / market_name / type
```
Removed value: -"string"
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / open_mid_probability_utc / oneOf
```
Added value: +[
+  {
+    "type": "number"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / by_venue / additionalProperties / items / properties / open_mid_probability_utc / type
```
Removed value: -"number"
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / probability_delta_today / oneOf
```
Added value: +[
+  {
+    "type": "number"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / by_venue / additionalProperties / items / properties / probability_delta_today / type
```
Removed value: -"number"
```
- addedOutput schema / properties / by_venue / additionalProperties / items / properties / volume_delta_usd_today / oneOf
```
Added value: +[
+  {
+    "type": "number"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / by_venue / additionalProperties / items / properties / volume_delta_usd_today / type
```
Removed value: -"number"
```
- changedOutput schema / properties / by_venue / additionalProperties / items / required
```
Previous value: -[
-  "rank_no",
-  "venue",
-  "venue_event_id",
-  "event_name",
-  "lead_market_id",
-  "market_name",
-  "source_data_status",
-  "excluded_reasons"
-]New value: +[
+  "rank_no",
+  "venue",
+  "venue_event_id",
+  "event_name",
+  "source_data_status",
+  "excluded_reasons"
+]
```
- addedOutput schema / properties / overall / items / properties / latest_mid_probability / oneOf
```
Added value: +[
+  {
+    "type": "number"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / overall / items / properties / latest_mid_probability / type
```
Removed value: -"number"
```
- addedOutput schema / properties / overall / items / properties / lead_market_id / oneOf
```
Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / overall / items / properties / lead_market_id / type
```
Removed value: -"string"
```
- addedOutput schema / properties / overall / items / properties / market_name / oneOf
```
Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / overall / items / properties / market_name / type
```
Removed value: -"string"
```
- addedOutput schema / properties / overall / items / properties / open_mid_probability_utc / oneOf
```
Added value: +[
+  {
+    "type": "number"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / overall / items / properties / open_mid_probability_utc / type
```
Removed value: -"number"
```
- addedOutput schema / properties / overall / items / properties / probability_delta_today / oneOf
```
Added value: +[
+  {
+    "type": "number"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / overall / items / properties / probability_delta_today / type
```
Removed value: -"number"
```
- addedOutput schema / properties / overall / items / properties / volume_delta_usd_today / oneOf
```
Added value: +[
+  {
+    "type": "number"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / overall / items / properties / volume_delta_usd_today / type
```
Removed value: -"number"
```
- changedOutput schema / properties / overall / items / required
```
Previous value: -[
-  "rank_no",
-  "venue",
-  "venue_event_id",
-  "event_name",
-  "lead_market_id",
-  "market_name",
-  "source_data_status",
-  "excluded_reasons"
-]New value: +[
+  "rank_no",
+  "venue",
+  "venue_event_id",
+  "event_name",
+  "source_data_status",
+  "excluded_reasons"
+]
```

Changed1 schema field changedApr 30, 2026

changedInput schema / properties / venue / description

Previous value: -"Optional venue filter. Allowed: polymarket, opinion, predict_fun."New value: +"Optional venue filter. Allowed: polymarket, predict_fun."

AddedApr 30, 2026

TDQS

A3.7/5.0

Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false. The description goes beyond by adding operational requirements: 'Requires opensearch.predictionRankIndex', and disclaimers: 'No account access, no order placement or fund transfers. Not investment advice.' These are valuable behavioral disclosures not present in 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 a single, dense paragraph that front-loads the core purpose and then lists filters, requirements, and caveats. It is concise and structured, with no redundant filler. Every sentence adds useful operational or behavioral context.

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?

Given the tool has 5 optional parameters, an output schema, and annotations covering safety, the description is complete enough for an agent to call it correctly. It covers the ranking basis, filters, the required index, read-only nature, and important disclaimers. It does not explain output format, but the output schema exists and covers that.

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 covers 100% of parameters with descriptions, including defaults and allowed values. The description restates some like 'category (exact term on rank index)' and 'status (active/closed/resolved/all; default active)' but adds no new information beyond the schema. Baseline 3 is appropriate since schema handles the burden.

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?

The description states a clear purpose: 'Daily venue/overall ranking by volume delta (UTC rank_date)'. It identifies the resource (ranking data) and the dimension (volume delta). It is specific enough to distinguish from generic ranking tools, though it does not explicitly name alternatives among siblings like fastest_rising_ranking.

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

Usage Guidelines3/5

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

The description provides context: it is read-only research data, requires opensearch.predictionRankIndex, and involves no account access or transactions. However, it does not explicitly state when to use this tool versus alternatives, nor does it name sibling tools or exclusions. The usage is implied by 'Read-only public research data' but not directly compared.

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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