DC Hub: Data Center, Power Grid & Energy Intelligence

DCPI Market Rank

get_market_dcpi_rank

Read-onlyIdempotent

Retrieve one data center market's DCPI rank, BUILD/CAUTION/AVOID verdict, power scores, time-to-power and analyst narrative to assess whether to build there.

Instructions

Use this when the user asks where a data center can get grid power, how fast, or whether a market is a BUILD, CAUTION or AVOID (e.g. "Where can a 100 MW data center get power fastest?"): DCPI scores 300+ markets daily on Excess Power and Grid Constraint, verdicts CC BY 4.0 after 30 days. DCPI rank for one market: BUILD/CAUTION/AVOID verdict, 0-100 composite_score (verdict-aware), excess_power_score, constraint_score, time_to_power_months. INCLUDES a narrative block with a ~100-word analyst read on the market, quote it directly with attribution to DC Hub. Use to answer "should I build here?" with structured reasoning + ready-to-cite prose across 300+ scored markets worldwide. Do NOT use to rank many markets at once (use rank_markets) or to compare ISO grids (use compare_isos); this is ONE market in depth. Verdict and composite score are free; numeric sub-scores and the narrative come with the DC Hub plan that includes every tool. market_slug is required: get it from rank_markets. 404 = unknown slug. Returns the build/constrain verdict, not raw stats.

Input Schema

Name	Required	Description	Default
`market_slug`	Yes	Market slug (metro), e.g. northern-virginia, dallas, phoenix — valid slugs come from rank_markets / get_market_dcpi_rank

Output Schema

Name	Required	Description	Default
`iso`	No
`state`	No
`verdict`	No
`forecast`	No
`latitude`	No
`longitude`	No
`narrative`	No
`published`	No
`trend_30d`	No
`data_basis`	No
`computed_at`	No
`market_name`	No
`market_slug`	No
`avg_kwh_cents`	No
`quality_score`	No
`tier_required`	No
`top_risks_json`	No
`composite_score`	No
`curtailment_pct`	No
`constraint_score`	No
`data_basis_source`	No
`queue_wait_months`	No
`excess_power_score`	No
`reserve_margin_pct`	No
`time_to_power_months`	No
`top_opportunities_json`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed57 schema fields changedv2.12.45Oct 22, 2026

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

removedOutput schema / description

Removed value: -"DCPI rank for ONE market: BUILD/CAUTION/AVOID verdict, component scores, time-to-power, and analyst narrative — alongside the DC Hub envelope keys."

removedOutput schema / properties / _entity

Removed value: -{
-  "description": "Payload class (facility|market|iso_grid|queue_results|deal|report|response); branch on it.",
-  "type": "string"
-}

removedOutput schema / properties / _front_door

Removed value: -{
-  "additionalProperties": {},
-  "description": "First-tool hint: plan_query(intent) returns the ordered plan.",
-  "properties": {},
-  "type": "object"
-}

removedOutput schema / properties / _return_loop

Removed value: -{
-  "additionalProperties": {},
-  "description": "Next-session delta call (get_changes).",
-  "properties": {},
-  "type": "object"
-}

removedOutput schema / properties / avg_kwh_cents / anyOf

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

removedOutput schema / properties / avg_kwh_cents / description

Removed value: -"Average retail power price, cents/kWh (may arrive as a string)"

removedOutput schema / properties / citation

Removed value: -{
-  "anyOf": [
-    {
-      "additionalProperties": {},
-      "properties": {},
-      "type": "object"
-    },
-    {
-      "type": "string"
-    }
-  ],
-  "description": "How to attribute DC Hub: {source, url, license, cite_as, retrieved_at}, or the attribution line as a string."
-}

removedOutput schema / properties / composite_score / anyOf

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

removedOutput schema / properties / composite_score / description
```
Removed value: -"0-100 verdict-aware composite score"
```

removedOutput schema / properties / computed_at / anyOf

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

removedOutput schema / properties / computed_at / description
```
Removed value: -"When the score row was computed"
```

removedOutput schema / properties / constraint_score / anyOf

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

removedOutput schema / properties / constraint_score / description
```
Removed value: -"0-100 constraint component"
```

removedOutput schema / properties / curtailment_pct / anyOf

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

removedOutput schema / properties / curtailment_pct / description
```
Removed value: -"Curtailment, %"
```

removedOutput schema / properties / data_basis / anyOf

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

removedOutput schema / properties / data_basis / description
```
Removed value: -"What the scores were computed from"
```

removedOutput schema / properties / data_basis_source / anyOf

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

removedOutput schema / properties / data_basis_source / description
```
Removed value: -"Source of the data basis"
```

removedOutput schema / properties / excess_power_score / anyOf

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

removedOutput schema / properties / excess_power_score / description
```
Removed value: -"0-100 excess-power component"
```

removedOutput schema / properties / forecast / anyOf

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

removedOutput schema / properties / forecast / description

Removed value: -"Forecast availability block: {available, note, reason, samples_in_30d} — see predict_market_trajectory"

removedOutput schema / properties / iso / anyOf

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

removedOutput schema / properties / iso / description
```
Removed value: -"ISO/RTO serving the market"
```

removedOutput schema / properties / latitude / anyOf

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

removedOutput schema / properties / latitude / description
```
Removed value: -"Market anchor latitude"
```

removedOutput schema / properties / longitude / anyOf

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

removedOutput schema / properties / longitude / description
```
Removed value: -"Market anchor longitude"
```

removedOutput schema / properties / market_name / anyOf

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

removedOutput schema / properties / market_name / description
```
Removed value: -"Market display name"
```

removedOutput schema / properties / market_slug / anyOf

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

removedOutput schema / properties / market_slug / description
```
Removed value: -"Market slug"
```

removedOutput schema / properties / narrative / description

Removed value: -"~100-word analyst read on the market, quote directly with attribution to DC Hub (CC-BY-4.0)"

removedOutput schema / properties / provenance

Removed value: -{
-  "additionalProperties": {},
-  "description": "Source, method, as_of, verification_counts, license, cite_as; quote it when citing.",
-  "properties": {},
-  "type": "object"
-}

removedOutput schema / properties / published / anyOf

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

removedOutput schema / properties / published / description
```
Removed value: -"Whether the score is published"
```

removedOutput schema / properties / quality_score / anyOf

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

removedOutput schema / properties / quality_score / description
```
Removed value: -"0-100 data-quality score for this market"
```

removedOutput schema / properties / queue_wait_months / anyOf

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

removedOutput schema / properties / queue_wait_months / description
```
Removed value: -"ISO queue wait, months"
```

removedOutput schema / properties / quota

Removed value: -{
-  "additionalProperties": {},
-  "description": "Caller quota state (remaining calls, tier).",
-  "properties": {},
-  "type": "object"
-}

removedOutput schema / properties / reserve_margin_pct / anyOf

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

removedOutput schema / properties / reserve_margin_pct / description
```
Removed value: -"Grid reserve margin, %"
```

removedOutput schema / properties / site_evaluation_handoff

Removed value: -{
-  "anyOf": [
-    {
-      "items": {
-        "additionalProperties": {},
-        "properties": {},
-        "type": "object"
-      },
-      "type": "array"
-    },
-    {
-      "additionalProperties": {},
-      "properties": {},
-      "type": "object"
-    }
-  ],
-  "description": "Follow-up calls [{tool, parameters, why}] when the payload carries coordinates."
-}

removedOutput schema / properties / state / anyOf

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

removedOutput schema / properties / state / description
```
Removed value: -"US state / region code"
```

removedOutput schema / properties / tier_required / anyOf

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

removedOutput schema / properties / tier_required / description
```
Removed value: -"Tier required for the full row"
```

removedOutput schema / properties / time_to_power_months / anyOf

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

removedOutput schema / properties / time_to_power_months / description

Removed value: -"Estimated months to power for a new interconnection"

removedOutput schema / properties / top_opportunities_json / description
```
Removed value: -"Top opportunity bullets for the market"
```
removedOutput schema / properties / top_risks_json / description
```
Removed value: -"Top risk bullets for the market"
```

removedOutput schema / properties / trend_30d / description

Removed value: -"30-day trend read when enough snapshots exist"

removedOutput schema / properties / verdict / anyOf

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

removedOutput schema / properties / verdict / description

Removed value: -"DCPI verdict: BUILD | CAUTION | AVOID"

Changed8 schema fields changedv2.12.43Oct 15, 2026

changedOutput schema / properties / _entity / description

Previous value: -"Payload class discriminator (e.g. facility|market|iso_grid|queue_results|deal|report|response) — branch on this before parsing the rest."New value: +"Payload class (facility|market|iso_grid|queue_results|deal|report|response); branch on it."

changedOutput schema / properties / _front_door / description

Previous value: -"In-band front-door hint (first workflow-entry tool of a session): call plan_query(intent) first for the ordered multi-step plan."New value: +"First-tool hint: plan_query(intent) returns the ordered plan."

changedOutput schema / properties / _return_loop / description

Previous value: -"Suggested next-session delta call (get_changes since=24h) so you pull only what changed."New value: +"Next-session delta call (get_changes)."

changedOutput schema / properties / citation / description

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

changedOutput schema / properties / narrative / description

Previous value: -"~100-word CBRE/JLL-style analyst read on the market — quote directly with attribution to DC Hub (CC-BY-4.0)"New value: +"~100-word analyst read on the market, quote directly with attribution to DC Hub (CC-BY-4.0)"

changedOutput schema / properties / provenance / description

Previous value: -"Collection-level provenance block: {source, method, as_of, verification_counts, cite_url_template, license, cite_as}. Quote the verification level when citing."New value: +"Source, method, as_of, verification_counts, license, cite_as; quote it when citing."

changedOutput schema / properties / quota / description

Previous value: -"Caller quota state (remaining calls, tier) when available."New value: +"Caller quota state (remaining calls, tier)."

changedOutput schema / properties / site_evaluation_handoff / description

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

Changed3 schema fields changedAug 30, 2026

removedInput schema / $schema

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

addedInput schema / required
```
Added value: +[
+  "market_slug"
+]
```

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": "DCPI rank for ONE market: BUILD/CAUTION/AVOID verdict, component scores, time-to-power, and analyst narrative — alongside the DC Hub 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"
+    },
+    "avg_kwh_cents": {
+      "anyOf": [
+        {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Average retail power price, cents/kWh (may arrive as a string)"
+    },
+    "citation": {
+      "additionalProperties": {},
+      "description": "Machine-readable citation: how to attribute DC Hub (dchub.cloud) for this payload.",
+      "properties": {},
+      "type": "object"
+    },
+    "composite_score": {
+      "anyOf": [
+        {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "0-100 verdict-aware composite score"
+    },
+    "computed_at": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "When the score row was computed"
+    },
+    "constraint_score": {
+      "anyOf": [
+        {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "0-100 constraint component"
+    },
+    "curtailment_pct": {
+      "anyOf": [
+        {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Curtailment, %"
+    },
+    "data_basis": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "What the scores were computed from"
+    },
+    "data_basis_source": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Source of the data basis"
+    },
+    "excess_power_score": {
+      "anyOf": [
+        {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "0-100 excess-power component"
+    },
+    "forecast": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "properties": {},
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Forecast availability block: {available, note, reason, samples_in_30d} — see predict_market_trajectory"
+    },
+    "iso": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "ISO/RTO serving the market"
+    },
+    "latitude": {
+      "anyOf": [
+        {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Market anchor latitude"
+    },
+    "longitude": {
+      "anyOf": [
+        {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Market anchor longitude"
+    },
+    "market_name": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Market display name"
+    },
+    "market_slug": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Market slug"
+    },
+    "narrative": {
+      "description": "~100-word CBRE/JLL-style analyst read on the market — quote directly with attribution to DC Hub (CC-BY-4.0)"
+    },
+    "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"
+    },
+    "published": {
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Whether the score is published"
+    },
+    "quality_score": {
+      "anyOf": [
+        {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "0-100 data-quality score for this market"
+    },
+    "queue_wait_months": {
+      "anyOf": [
+        {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "ISO queue wait, months"
+    },
+    "quota": {
+      "additionalProperties": {},
+      "description": "Caller quota state (remaining calls, tier) when available.",
+      "properties": {},
+      "type": "object"
+    },
+    "reserve_margin_pct": {
+      "anyOf": [
+        {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Grid reserve margin, %"
+    },
+    "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."
+    },
+    "state": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "US state / region code"
+    },
+    "tier_required": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Tier required for the full row"
+    },
+    "time_to_power_months": {
+      "anyOf": [
+        {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Estimated months to power for a new interconnection"
+    },
+    "top_opportunities_json": {
+      "description": "Top opportunity bullets for the market"
+    },
+    "top_risks_json": {
+      "description": "Top risk bullets for the market"
+    },
+    "trend_30d": {
+      "description": "30-day trend read when enough snapshots exist"
+    },
+    "verdict": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "DCPI verdict: BUILD | CAUTION | AVOID"
+    }
+  },
+  "type": "object"
+}

Changed1 schema field changedv2.3.6Jul 2, 2026

addedInput schema / properties / market_slug / description

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

First observedv2.1.19Jun 8, 2026

TDQS

A4.8/5.0

Behavior5/5

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

Annotations already cover the safety profile (readOnly, idempotent, not open-world), and the description adds non-obvious behavior on top: daily refresh cadence, CC BY 4.0 licensing after 30 days with an attribution requirement, tier gating (verdict and composite free; sub-scores and narrative paywalled), and 404 semantics for unknown slugs.

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 trigger question and the core payload list are front-loaded, and most sentences carry routing, licensing, or gating information. Some promotional framing ("300+ markets worldwide", "structured reasoning + ready-to-cite prose") slightly dilutes density.

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 single-lookup tool with an output schema, the description covers everything an agent needs: how to obtain the slug, error behavior, what is free vs gated, and a plain-language summary of the returned verdict fields.

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% and the single param is fully described in the schema, so baseline is 3. The description adds operational meaning the schema lacks: where the slug comes from (rank_markets) and what a 404 means. It stops short of format/syntax guidance, so not a 5.

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 concrete verb+resource (returns DCPI rank verdict for ONE market) and enumerates the returned fields. It explicitly distinguishes itself from rank_markets and compare_isos, so an agent can route correctly without opening any schema.

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?

Names the triggering user questions, gives an explicit exclusion ("Do NOT use to rank many markets at once (use rank_markets) or to compare ISO grids (use compare_isos)"), and states the selection condition (one market in depth). This is the when/when-not/alternatives pattern at full strength.

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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