DC Hub — Data Center & Energy Intelligence

Gas Index (DCGI)

get_gas_index

Read-onlyIdempotent

Assess a US state's natural-gas suitability for data centers with the DCGI score and verdict, including EIA pricing series and unscored reason if unpriced.

Instructions

Data Center Gas Index (DCGI) — the per-US-state natural-gas suitability score. ★ WITHDRAWN 2026-08-08, RESTORED 2026-08-30 after all three defective terms were repaired: the 20-point interstate-share term was case-blind against EIA TYPEPIPE and scored ~0 for every state (122 -> 17,571 segments now counted); the price was chosen by a non-deterministic tie-break across the EIA industrial (PIN) and electric-power (PEU) series, which carry different margins; and nine states including Texas ran on a hardcoded cost constant because the price loader dropped them on a case-sensitive name lookup. ★ 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. ★ STILL WITHDRAWN and NOT restored by this: every gas-fired $/MWh figure — a separate defect from the same audit. Use get_gas_intelligence for pipeline, operator and parent-midstream data.

Input Schema

TableJSON 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. 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 Withdrawn 2026-08-08, restored 2026-08-30: do NOT compare against a figure published before 2026-08-08.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

Output Schema

TableJSON Schema

Name	Required	Description
`quota`	No	Caller quota state (remaining calls, tier) when available.
`_entity`	No	Payload class discriminator (e.g. facility\|market\|iso_grid\|queue_results\|deal\|report\|response) — branch on this before parsing the rest.
`citation`	No	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.
`provenance`	No	Collection-level provenance block: {source, method, as_of, verification_counts, cite_url_template, license, cite_as}. Quote the verification level when citing.
`_front_door`	No	In-band front-door hint (first workflow-entry tool of a session): call plan_query(intent) first for the ordered multi-step plan.
`_return_loop`	No	Suggested next-session delta call (get_changes since=24h) so you pull only what changed.
`site_evaluation_handoff`	No	Pre-built follow-up calls (analyze_site / get_water_risk args) when the payload carries coordinates — an array of {tool, parameters, why} entries.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedv2.12.6Sep 1, 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"

Changed3 schema fields changedAug 30, 2026

removedInput schema / $schema

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

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"

removedOutput schema / $schema

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

Changed5 schema fields changedv2.3.20Aug 14, 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 changedv2.3.12Jul 28, 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"
+    },
+    "_front_door": {
+      "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"
+    },
+    "_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": {
+      "anyOf": [
+        {
+          "items": {
+            "additionalProperties": {},
+            "properties": {},
+            "type": "object"
+          },
+          "type": "array"
+        },
+        {
+          "additionalProperties": {},
+          "properties": {},
+          "type": "object"
+        }
+      ],
+      "description": "Pre-built follow-up calls (analyze_site / get_water_risk args) when the payload carries coordinates — an array of {tool, parameters, why} entries."
+    }
+  },
+  "type": "object"
+}

Changed4 schema fields changedv2.3.6Jul 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"

First observedv2.1.19Jun 8, 2026

TDQS

A4.5/5.0

Behavior5/5

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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the bar is lower, yet the description adds substantial context: the withdrawal/restoration history, the three repaired defects (case-blind EIA TYPEPIPE term, non-deterministic price tie-break, hardcoded cost constant), the UNSCORED-as-absence semantics, and the still-withdrawn $/Wh figures. It discloses a known landmine (serial incomparability) that annotations cannot express. No contradiction with annotations; readOnlyHint aligns with a read tool.

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?

Cearly front-loaded with the purpose sentence, but the description is ~200 words with repeated warnings: the UNSCORED message and the withdrawal warning appear nearly verbatim in both the tool description and the state param schema description, wasting tokens. The three-asterisk correction narrative on the repair defects is dense and could be compressed to the operational implication. It reads as a patch list rather than a tool contract.

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?

For a tool with this much hidden complexity — temporal incomparability, null-as-absence semantics, a separate still-withdrawn artifact — the description is highly complete. The output schema exists, so return values don't need spelling out. Minor deduction for the repetitive structure, but nothing an agent needs to call it correctly is missing.

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% for both params, so baseline is 3. The description adds meaning beyond the schema by explaining why `gas_price_series` matters (which EIA series answered, PIN vs PEU carrying different margins) and why a state may come back UNSCORED with null dcgi. It deepens the agent's understanding of the state parameter's output behavior rather than merely restating 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?

The opening sentence states a specific verb+resource+scope: 'Data Center Gas Index (DCGI) — the per-US-state natural-gas suitability score.' It clearly distinguishes what this tool returns (a per-state score with verdict and series attribution) from the sibling get_gas_intelligence by naming that alternative for pipeline/operator data. The purpose is unambiguous and not obscured by the correction history.

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?

Explicitly says 'Use get_gas_intelligence for pipeline, operator and parent-midstream data,' routing the agent away from this tool for those data. Also gives a strong when-not-to-use constraint: 'DO NOT COMPARE a DCGI figure published before 2026-08-08 with one published now.' This is exactly the level of directive an agent needs to avoid a subtle misuse.

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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