DC Hub

Gas Index (DCGI)

get_gas_index

Read-onlyIdempotent

Use this when the user asks which US states suit gas-fired data center power: the Data Center Gas Index (DCGI), a per-state score. ★ DO NOT COMPARE a DCGI figure published before 2026-08-08 with one published now — they are different indices; the full record is at /api/v1/dcgi/methodology under corrections. A state that cannot be priced comes back verdict UNSCORED with dcgi null and an unscored_reason, never a placeholder score, so treat UNSCORED as absence and not as a low score. gas_price_series names which EIA series answered each state. Gas-fired $/MWh figures, withdrawn the same day for a separate defect, were republished 2026-09-27 under one burner-tip price rule (see get_gas_economics). Use get_gas_intelligence for pipeline, operator and parent-midstream data.

Input Schema

Name	Required	Description	Default
`limit`	No	Max results to return (1-500; default varies by tool)
`state`	No	US state abbreviation, e.g. TX, VA, AZ. Returns the DCGI score and verdict, plus `gas_price_series` naming which EIA series priced the state.

Output Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed7 schema fields changedOct 19, 2026
- removedOutput schema / properties / _entity
```
Removed value: -{
-  "type": "string"
-}
```
- removedOutput schema / properties / _front_door
```
Removed value: -{
-  "type": "object"
-}
```
- removedOutput schema / properties / _return_loop
```
Removed value: -{
-  "type": "object"
-}
```
- removedOutput schema / properties / citation
```
Removed value: -{}
```
- removedOutput schema / properties / provenance
```
Removed value: -{
-  "type": "object"
-}
```
- removedOutput schema / properties / quota
```
Removed value: -{
-  "type": "object"
-}
```
- removedOutput schema / properties / site_evaluation_handoff
```
Removed value: -{}
```

Changed20 schema fields changedOct 18, 2026

changedInput schema / properties / state / description

Previous value: -"US state abbreviation, e.g. TX, VA, AZ. Returns the DCGI score and verdict, plus `gas_price_series` naming which EIA series priced the state. A state that cannot be priced comes back verdict UNSCORED with dcgi null and an `unscored_reason` — absence, not a low score. Withdrawn 2026-08-08, restored 2026-08-30: do NOT compare against a figure published before 2026-08-08. Use get_gas_intelligence for the per-state pipeline and operator brief"New value: +"US state abbreviation, e.g. TX, VA, AZ. Returns the DCGI score and verdict, plus `gas_price_series` naming which EIA series priced the state."

changedOutput schema / additionalProperties
```
Previous value: -{}New value: +true
```

removedOutput schema / description

Removed value: -"DC Hub envelope: tool data fields ride at the top level beside these keys."

removedOutput schema / properties / _entity / description

Removed value: -"Payload class (facility|market|iso_grid|queue_results|deal|report|response); branch on it."

removedOutput schema / properties / _front_door / additionalProperties
```
Removed value: -{}
```

removedOutput schema / properties / _front_door / description

Removed value: -"First-tool hint: plan_query(intent) returns the ordered plan."

removedOutput schema / properties / _front_door / properties
```
Removed value: -{}
```
removedOutput schema / properties / _return_loop / additionalProperties
```
Removed value: -{}
```
removedOutput schema / properties / _return_loop / description
```
Removed value: -"Next-session delta call (get_changes)."
```
removedOutput schema / properties / _return_loop / properties
```
Removed value: -{}
```

removedOutput schema / properties / citation / anyOf

Removed value: -[
-  {
-    "additionalProperties": {},
-    "properties": {},
-    "type": "object"
-  },
-  {
-    "type": "string"
-  }
-]

removedOutput schema / properties / citation / description

Removed value: -"How to attribute DC Hub: {source, url, license, cite_as, retrieved_at}, or the attribution line as a string."

removedOutput schema / properties / provenance / additionalProperties
```
Removed value: -{}
```

removedOutput schema / properties / provenance / description

Removed value: -"Source, method, as_of, verification_counts, license, cite_as; quote it when citing."

removedOutput schema / properties / provenance / properties
```
Removed value: -{}
```
removedOutput schema / properties / quota / additionalProperties
```
Removed value: -{}
```

removedOutput schema / properties / quota / description

Removed value: -"Caller quota state (remaining calls, tier)."

removedOutput schema / properties / quota / properties
```
Removed value: -{}
```

removedOutput schema / properties / site_evaluation_handoff / anyOf

Removed value: -[
-  {
-    "items": {
-      "additionalProperties": {},
-      "properties": {},
-      "type": "object"
-    },
-    "type": "array"
-  },
-  {
-    "additionalProperties": {},
-    "properties": {},
-    "type": "object"
-  }
-]

removedOutput schema / properties / site_evaluation_handoff / description

Removed value: -"Follow-up calls [{tool, parameters, why}] when the payload carries coordinates."

AddedOct 9, 2026
RemovedSep 29, 2026

Changed1 schema field changedAug 31, 2026

changedInput schema / properties / state / description

Previous value: -"US state abbreviation, e.g. TX, VA, AZ. The DCGI score is WITHDRAWN (2026-08-08): any value returns unavailable_reason, never a score — use get_gas_intelligence for the per-state gas brief"New value: +"US state abbreviation, e.g. TX, VA, AZ. Returns the DCGI score and verdict, plus `gas_price_series` naming which EIA series priced the state. A state that cannot be priced comes back verdict UNSCORED with dcgi null and an `unscored_reason` — absence, not a low score. Withdrawn 2026-08-08, restored 2026-08-30: do NOT compare against a figure published before 2026-08-08. Use get_gas_intelligence for the per-state pipeline and operator brief"

Changed1 schema field changedAug 22, 2026

changedInput schema / properties / state / description

Previous value: -"US state abbreviation for a single-state DCGI breakdown, e.g. TX, VA, AZ; omit for the national ranking"New value: +"US state abbreviation, e.g. TX, VA, AZ. The DCGI score is WITHDRAWN (2026-08-08): any value returns unavailable_reason, never a score — use get_gas_intelligence for the per-state gas brief"

Changed2 schema fields changedAug 21, 2026

removedInput schema / $schema

Removed value: -"http://json-schema.org/draft-07/schema#"

removedOutput schema / $schema

Removed value: -"http://json-schema.org/draft-07/schema#"

Changed5 schema fields changedAug 11, 2026

removedOutput schema / properties / citation / additionalProperties
```
Removed value: -{}
```

addedOutput schema / properties / citation / anyOf

Added value: +[
+  {
+    "additionalProperties": {},
+    "properties": {},
+    "type": "object"
+  },
+  {
+    "type": "string"
+  }
+]

changedOutput schema / properties / citation / description

Previous value: -"Machine-readable citation: how to attribute DC Hub (dchub.cloud) for this payload."New value: +"Machine-readable citation: how to attribute DC Hub (dchub.cloud) for this payload. Normally an OBJECT {source, url, license, cite_as, retrieved_at}; a bare string is accepted and carries the attribution line itself."

removedOutput schema / properties / citation / properties
```
Removed value: -{}
```
removedOutput schema / properties / citation / type
```
Removed value: -"object"
```

Changed1 schema field changedJul 21, 2026

addedOutput schema / properties / _front_door

Added value: +{
+  "additionalProperties": {},
+  "description": "In-band front-door hint (first workflow-entry tool of a session): call plan_query(intent) first for the ordered multi-step plan.",
+  "properties": {},
+  "type": "object"
+}

Changed5 schema fields changedJul 18, 2026

removedOutput schema / properties / site_evaluation_handoff / additionalProperties
```
Removed value: -{}
```

addedOutput schema / properties / site_evaluation_handoff / anyOf

Added value: +[
+  {
+    "items": {
+      "additionalProperties": {},
+      "properties": {},
+      "type": "object"
+    },
+    "type": "array"
+  },
+  {
+    "additionalProperties": {},
+    "properties": {},
+    "type": "object"
+  }
+]

changedOutput schema / properties / site_evaluation_handoff / description

Previous value: -"Pre-built follow-up call (analyze_site / get_water_risk args) when the payload carries coordinates."New value: +"Pre-built follow-up calls (analyze_site / get_water_risk args) when the payload carries coordinates — an array of {tool, parameters, why} entries."

removedOutput schema / properties / site_evaluation_handoff / properties
```
Removed value: -{}
```
removedOutput schema / properties / site_evaluation_handoff / type
```
Removed value: -"object"
```

Changed1 schema field changedJul 17, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": {},
+  "description": "DC Hub envelope: structuredContent mirrors the JSON payload in content[0].text — tool-specific data fields ride at the top level alongside these envelope keys.",
+  "properties": {
+    "_entity": {
+      "description": "Payload class discriminator (e.g. facility|market|iso_grid|queue_results|deal|report|response) — branch on this before parsing the rest.",
+      "type": "string"
+    },
+    "_return_loop": {
+      "additionalProperties": {},
+      "description": "Suggested next-session delta call (get_changes since=24h) so you pull only what changed.",
+      "properties": {},
+      "type": "object"
+    },
+    "citation": {
+      "additionalProperties": {},
+      "description": "Machine-readable citation: how to attribute DC Hub (dchub.cloud) for this payload.",
+      "properties": {},
+      "type": "object"
+    },
+    "provenance": {
+      "additionalProperties": {},
+      "description": "Collection-level provenance block: {source, method, as_of, verification_counts, cite_url_template, license, cite_as}. Quote the verification level when citing.",
+      "properties": {},
+      "type": "object"
+    },
+    "quota": {
+      "additionalProperties": {},
+      "description": "Caller quota state (remaining calls, tier) when available.",
+      "properties": {},
+      "type": "object"
+    },
+    "site_evaluation_handoff": {
+      "additionalProperties": {},
+      "description": "Pre-built follow-up call (analyze_site / get_water_risk args) when the payload carries coordinates.",
+      "properties": {},
+      "type": "object"
+    }
+  },
+  "type": "object"
+}

Changed4 schema fields changedJul 2, 2026

addedInput schema / properties / limit / description

Added value: +"Max results to return (1-500; default varies by tool)"

changedInput schema / properties / limit / maximum

Previous value: -9007199254740991New value: +500

changedInput schema / properties / limit / minimum

Previous value: --9007199254740991New value: +1

addedInput schema / properties / state / description

Added value: +"US state abbreviation for a single-state DCGI breakdown, e.g. TX, VA, AZ; omit for the national ranking"

AddedMay 31, 2026

TDQS

A4.6/5.0

Behavior5/5

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

Annotations already declare a safe, idempotent read, so the bar is low, yet the description adds substantial behavioral context: the index-versioning hazard (differing DCGI figures before/after 2026-08-08), where the full methodology record lives, and the UNSCORED-not-low-score semantics. It also explains that gas_price_series identifies which EIA series priced each state.

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 core purpose before the caveats, and most sentences (UNSCORED semantics, version warning, sibling routing) earn their place. It is somewhat packed with dated incident detail (same-day withdrawal, 2026-09-27 republish) that could be tightened, but it remains readable.

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?

With an output schema present, return values need not be re-explained, and the description still covers the two things an agent must not get wrong: cross-version comparability and treating UNSCORED as absence. Alternatives and the methodology endpoint are also supplied.

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 description coverage is 100%, so both parameters (limit, state) are already fully documented, which sets the baseline at 3. The description adds semantics around state output (verdict, gas_price_series) but nothing new about parameter syntax or constraints beyond the schema.

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+scope: 'which US states suit gas-fired data center power' scored per-state by the Data Center Gas Index (DCGI). It is clearly distinguishable from sibling gas tools, naming get_gas_intelligence (pipeline/operator/midstream) and get_gas_economics as the alternatives.

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?

Gives an explicit trigger ('Use this when the user asks which US states suit gas-fired data center power') and explicit routing away from siblings ('Use get_gas_intelligence for pipeline, operator and parent-midstream data'), plus a reference to get_gas_economics. When-to-use and when-to-use-something-else are both covered.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

All DC Hub tools Inspect

Try in Browser

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Glama MCP Gateway

Add one secure layer between your agents and this server.

Gas Index (DCGI)

Input Schema

Output Schema

Schema Changelog

TDQS

Glama MCP Gateway

Resources