DC Hub

Rank Markets

rank_markets

Read-onlyIdempotent

Use this when the user wants a ranked list of data-center markets, including where a data center can get grid power (criteria="ai_ready", DCPI): top N by cheapest_power, most_capacity, most_operators, fastest_growing, best_overall, or ai_ready (where new AI load can land, per DCPI). Filter by region, min_capacity_mw. Returns ranked rows with score, MW and a slug for follow-ups; score is the sort value, not a 0-100 scale, and score_basis says what it is (ai_ready omits it and explains its composite in methodology). Keyless: a trimmed preview; a free key gets a few full lists a day. Ex: "Top 10 US markets, ai_ready." Returns market slugs to feed get_market_intel and get_market_dcpi_rank. limit 1-500; set projection=identity_only to save tokens.

Input Schema

Name	Required	Description
`limit`	No	Number of markets to return, 1-50 (default 10)
`fields`	No	Return ONLY these row fields (array or comma string) — a token diet. The response envelope (citation, provenance, as_of, coverage, request_interpretation, the human relay line) is NEVER projected away; a projection narrows ROWS only.
`region`	No	Region scope: "global", "us" (default), "canada", "eu", "apac", or "americas"
`mpp_pay`	No	Per-call payment quote (Stripe MPP): true returns a signed payment challenge instead of the free preview; no money moves. Set it only after your human has explicitly approved paying for this call.
`criteria`	No	Ranking criterion: "cheapest_power", "most_capacity", "most_operators", "fastest_growing", "best_overall" (default), or "ai_ready" (DCPI buildability — where new AI load can land, for AI-campus siting; region us/global)
`projection`	No	Named field preset, cheaper to send than a field list: market_summary (ranking rows), siting_summary (site/point rows), identity_only (ids + names).
`mpp_credential`	No	Per-call payment (Stripe MPP): the Shared Payment Token for challenges[0]; pays that challenge for this one call. Send it only with your human's explicit approval of the charge.
`min_capacity_mw`	No	Minimum existing capacity filter in megawatts (MW), e.g. 100

Output Schema

Name	Required	Description	Default
`tier`	No
`region`	No
`cite_as`	No
`results`	No
`criteria`	No
`data_source`	No
`methodology`	No
`score_basis`	No
`result_count`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedOct 22, 2026

addedInput schema / properties / mpp_credential

Added value: +{
+  "description": "Per-call payment (Stripe MPP): the Shared Payment Token for challenges[0]; pays that challenge for this one call. Send it only with your human's explicit approval of the charge.",
+  "type": "string"
+}

addedInput schema / properties / mpp_pay

Added value: +{
+  "description": "Per-call payment quote (Stripe MPP): true returns a signed payment challenge instead of the free preview; no money moves. Set it only after your human has explicitly approved paying for this call.",
+  "type": "boolean"
+}

Changed2 schema fields changedOct 22, 2026

removedInput schema / properties / mpp_credential

Removed value: -{
-  "description": "Per-call payment (Stripe MPP): the Shared Payment Token for challenges[0]; pays that challenge for this one call. Send it only with your human's explicit approval of the charge.",
-  "type": "string"
-}

removedInput schema / properties / mpp_pay

Removed value: -{
-  "description": "Per-call payment quote (Stripe MPP): true returns a signed payment challenge instead of the free preview; no money moves. Set it only after your human has explicitly approved paying for this call.",
-  "type": "boolean"
-}

Changed2 schema fields changedOct 20, 2026

changedInput schema / properties / mpp_credential / description

Previous value: -"Stripe MPP step 2: the Shared Payment Token minted for challenges[0]; pays that challenge for this one call."New value: +"Per-call payment (Stripe MPP): the Shared Payment Token for challenges[0]; pays that challenge for this one call. Send it only with your human's explicit approval of the charge."

changedInput schema / properties / mpp_pay / description

Previous value: -"Stripe MPP step 1: true returns a signed per-call payment challenge (a quote; no money moves) instead of the free preview. Agents only."New value: +"Per-call payment quote (Stripe MPP): true returns a signed payment challenge instead of the free preview; no money moves. Set it only after your human has explicitly approved paying for this call."

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: -{}
```

Changed36 schema fields changedOct 18, 2026

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

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 / cite_as / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

removedOutput schema / properties / cite_as / description
```
Removed value: -"Ready-made attribution line"
```

removedOutput schema / properties / criteria / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

removedOutput schema / properties / criteria / description
```
Removed value: -"Ranking criterion used"
```

removedOutput schema / properties / data_source / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

removedOutput schema / properties / data_source / description
```
Removed value: -"Where the data comes from"
```

removedOutput schema / properties / methodology / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

removedOutput schema / properties / methodology / description
```
Removed value: -"Method note"
```
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 / region / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

removedOutput schema / properties / region / description
```
Removed value: -"Region filter applied"
```

removedOutput schema / properties / result_count / anyOf

Removed value: -[
-  {
-    "anyOf": [
-      {
-        "type": "number"
-      },
-      {
-        "type": "string"
-      }
-    ]
-  },
-  {
-    "type": "null"
-  }
-]

removedOutput schema / properties / result_count / description
```
Removed value: -"Rows returned in THIS response"
```

removedOutput schema / properties / results / anyOf

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

removedOutput schema / properties / results / description
```
Removed value: -"Ranked markets"
```

removedOutput schema / properties / score_basis / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

removedOutput schema / properties / score_basis / description
```
Removed value: -"How the score is computed"
```

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."

removedOutput schema / properties / tier / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

removedOutput schema / properties / tier / description
```
Removed value: -"Tier the response was served at"
```

AddedOct 9, 2026
RemovedSep 29, 2026

Changed2 schema fields changedSep 29, 2026

changedInput schema / properties / mpp_credential / description

Previous value: -"Autonomous payment (Stripe MPP), step 2: the Shared Payment Token you minted for challenges[0]. Set it here to pay $0.50 for this single call and receive the full result — no API key, no subscription, no human. One payment covers one call."New value: +"Autonomous payment (Stripe MPP), step 2: the Shared Payment Token you minted for challenges[0]. Set it here to pay that challenge for this single call and receive the full result — no API key, no subscription, no human. One payment covers one call."

changedInput schema / properties / mpp_pay / description

Previous value: -"Autonomous payment (Stripe MPP), step 1: set true to receive a signed $0.50 payment challenge for this call instead of the free preview. No money moves — a challenge is a price quote. Humans never set this, so it does not affect the normal free/trial funnel."New value: +"Autonomous payment (Stripe MPP), step 1: set true to receive a signed per-call payment challenge (the challenge states the amount) for this call instead of the free preview. No money moves — a challenge is a price quote. Humans never set this, so it does not affect the normal free/trial funnel."

Changed2 schema fields changedSep 8, 2026

addedInput schema / properties / mpp_credential

Added value: +{
+  "description": "Autonomous payment (Stripe MPP), step 2: the Shared Payment Token you minted for challenges[0]. Set it here to pay $0.50 for this single call and receive the full result — no API key, no subscription, no human. One payment covers one call.",
+  "type": "string"
+}

addedInput schema / properties / mpp_pay

Added value: +{
+  "description": "Autonomous payment (Stripe MPP), step 1: set true to receive a signed $0.50 payment challenge for this call instead of the free preview. No money moves — a challenge is a price quote. Humans never set this, so it does not affect the normal free/trial funnel.",
+  "type": "boolean"
+}

Changed2 schema fields changedAug 29, 2026

addedInput schema / properties / fields

Added value: +{
+  "anyOf": [
+    {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    {
+      "type": "string"
+    }
+  ],
+  "description": "Return ONLY these row fields (array or comma string) — a token diet. The response envelope (citation, provenance, as_of, coverage, request_interpretation, the human relay line) is NEVER projected away; a projection narrows ROWS only."
+}

addedInput schema / properties / projection

Added value: +{
+  "description": "Named field preset, cheaper to send than a field list: market_summary (ranking rows), siting_summary (site/point rows), identity_only (ids + names).",
+  "enum": [
+    "siting_summary",
+    "market_summary",
+    "identity_only"
+  ],
+  "type": "string"
+}

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"
+}

Changed1 schema field changedJul 20, 2026

changedInput schema / properties / criteria / description

Previous value: -"Ranking criterion: \"cheapest_power\", \"most_capacity\", \"most_operators\", \"fastest_growing\", or \"best_overall\" (default)"New value: +"Ranking criterion: \"cheapest_power\", \"most_capacity\", \"most_operators\", \"fastest_growing\", \"best_overall\" (default), or \"ai_ready\" (DCPI buildability — where new AI load can land, for AI-campus siting; region us/global)"

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"
+}

Changed6 schema fields changedJul 2, 2026

addedInput schema / properties / criteria / description

Added value: +"Ranking criterion: \"cheapest_power\", \"most_capacity\", \"most_operators\", \"fastest_growing\", or \"best_overall\" (default)"

addedInput schema / properties / limit / description

Added value: +"Number of markets to return, 1-50 (default 10)"

changedInput schema / properties / limit / maximum

Previous value: -9007199254740991New value: +500

changedInput schema / properties / limit / minimum

Previous value: --9007199254740991New value: +1

addedInput schema / properties / min_capacity_mw / description

Added value: +"Minimum existing capacity filter in megawatts (MW), e.g. 100"

addedInput schema / properties / region / description

Added value: +"Region scope: \"global\", \"us\" (default), \"canada\", \"eu\", \"apac\", or \"americas\""

AddedMay 24, 2026

TDQS

A4.4/5.0

Behavior5/5

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

Goes well beyond the readOnly/idempotent annotations: discloses the keyless rate limit ('a trimmed preview; a free key gets a few full lists a day'), the MPP payment-challenge behavior, and the non-obvious semantics of the score column (sort value, not a 0-100 scale, with score_basis and ai_ready's `methodology` caveat) — exactly the quirks an agent cannot infer from the schema.

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?

Front-loads the trigger well, but the body crams criteria lists, access tiers, payment behavior, and score semantics into dense run-on sentences with stacked parentheticals. Every fact is relevant, yet the formatting makes the agent parse rather than skim.

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?

Covers access model, payment path, projection, region scoping, and criteria semantics, and an output schema already handles return structure. The only real omission is guidance on when to prefer this over the other market-ranking siblings, plus the unresolved limit-range discrepancy.

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?

With 100% schema coverage the baseline is 3, but the description adds real meaning: it glosses the criteria values and their intent, and explains projection=identity_only as a token-saving preset. Minor blemish: the description says 'limit 1-500' while the schema's own limit text says '1-50', an internal inconsistency the description does not resolve.

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 (ranked list of data-center markets) and enumerates the ranking criteria that define the result set. It also names the follow-up tools (get_market_intel, get_market_dcpi_rank) and, via the resource noun 'markets', separates itself from the rank_sites sibling.

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?

Opens with an explicit trigger ('Use this when the user wants a ranked list of data-center markets'), scopes ai_ready to AI-campus siting, and explains the keyless-preview vs free-key access path. It stops short of an explicit when-NOT-to-use statement versus other ranking siblings such as rank_sites or get_market_dcpi_rank.

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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