DC Hub

Get Gas Economics

get_gas_economics

Read-onlyIdempotent

Behind-the-meter / gas-fired power inputs for a US data-center market: Henry Hub spot, regional basis differential, and the delivered industrial + electric gas tariff ($/MMBtu), each with its own source label. Pass market= (e.g. "northern-virginia", "dallas", "phoenix"). Also returns the gas-to-grid fuel cost ($/MWh across CCGT/peaker heat-rate scenarios) — ★ WITHDRAWN 2026-08-08, RESTORED 2026-09-27 under one burner-tip price rule now used by every surface: EIA electric-power (PEU) delivered gas only, trailing-12-month mean over one window shared by every state (negative months included), published only when at least 9 of 12 months are reported and the mean is above $0 and at most $20/MMBtu. burner_tip carries the price, window, months reported and monthly min/max; a state that fails the rule comes back with null scenarios and burner_tip.reason (EIA withholds the monthly price for several states, e.g. AZ, GA, FL), never a substitute price; if the backend switch is ever turned off again, gas_to_grid_status carries that reason. ★ DO NOT COMPARE a $/MWh published before 2026-09-27 with one published now — each surface then picked the price its own way, up to 5.5x apart. Do not derive a $/MWh yourself from the $/MMBtu layers for a withheld state without saying that you did. Do NOT use for the electricity grid fuel mix (use get_grid_data).

Input Schema

TableJSON Schema

Name	Required	Description	Default
`market`	Yes	Market slug (metro), e.g. northern-virginia, dallas, phoenix — valid slugs come from rank_markets / get_market_dcpi_rank
`heat_rate_btu_per_kwh`	No	Optional custom generator heat rate in Btu/kWh for the gas-to-grid $/MWh scenario, e.g. 6800 (avg CCGT)

Output Schema

TableJSON Schema

Name	Required	Description
`quota`	No	Caller quota state (remaining calls, tier).
`_entity`	No	Payload class (facility\|market\|iso_grid\|queue_results\|deal\|report\|response); branch on it.
`citation`	No	How to attribute DC Hub: {source, url, license, cite_as, retrieved_at}, or the attribution line as a string.
`provenance`	No	Source, method, as_of, verification_counts, license, cite_as; quote it when citing.
`_front_door`	No	First-tool hint: plan_query(intent) returns the ordered plan.
`_return_loop`	No	Next-session delta call (get_changes).
`site_evaluation_handoff`	No	Follow-up calls [{tool, parameters, why}] when the payload carries coordinates.

Schema Changelog

Changes observed during successful MCP inspections.

AddedOct 9, 2026
RemovedSep 29, 2026
Changed1 schema field changedAug 29, 2026
- addedInput schema / required
```
Added value: +[
+  "market"
+]
```

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"
+}

Changed2 schema fields changedJul 2, 2026

addedInput schema / properties / heat_rate_btu_per_kwh / description

Added value: +"Optional custom generator heat rate in Btu/kWh for the gas-to-grid $/MWh scenario, e.g. 6800 (avg CCGT)"

addedInput schema / properties / market / description

Added value: +"Market slug (metro), e.g. northern-virginia, dallas, phoenix — valid slugs come from rank_markets / get_market_dcpi_rank"

AddedJun 19, 2026

TDQS

A4.1/5.0

Behavior4/5

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

Annotations already carry the full safety profile (readOnly, idempotent, openWorld, non-destructive), and the description substantially exceeds them: it discloses the burner-tip price rule (EIA PEU delivered gas, trailing-12-month mean, 9-of-12 month reporting floor, $0-$20 bounds), the null-with-reason behavior for withheld states (AZ, GA, FL), and the gas_to_grid_status switch field. The lengthy WITHDRAWN/RESTORED changelog partly muddies what is true *now*, which keeps this from a 5.

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

Conciseness3/5

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

The core purpose is front-loaded, which helps, but the body is bloated with internal changelog narration (starred WITHDRAWN/RESTORED dates) that does not help an agent invoke the tool. The genuinely load-bearing warnings (no cross-date $/MWh comparison, no do-it-yourself derivation) are buried mid-paragraph rather than surfaced.

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?

For a high-complexity price tool with an output schema already present, the description covers the remaining behavioral gaps an agent needs: withholding rules, null/status fallbacks, and data-integrity warnings. Return-field explanation (burner_tip contents) is somewhat redundant with the output schema but not harmful.

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 are already documented and the baseline is 3. The description adds only marginal meaning for `market` (example slugs, pointer to rank_markets) and never mentions `heat_rate_btu_per_kwh` except obliquely via 'CCGT/peaker heat-rate scenarios'.

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 names a specific resource (Henry Hub spot, regional basis differential, delivered industrial + electric gas tariff in $/MMBtu) for a clearly bounded scope (US data-center market). The closing instruction explicitly separates it from a sibling (get_grid_data) so an agent can route without opening a schema. It is verbose, but the purpose itself is unambiguous and sibling-distinguishing.

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?

It gives an explicit exclusion plus alternative ('Do NOT use for the electricity grid fuel mix (use get_grid_data)') and states where valid slugs come from (rank_markets / get_market_dcpi_rank). It does not, however, differentiate usage against the nearest-looking siblings like get_gas_index or get_gas_intelligence, so a routing question remains.

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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