DC Hub

Market Scenario Simulator

simulate_scenario

Read-onlyIdempotent

Use this when the user asks how data center power market rankings change under what-if conditions: re-scores 300+ DC Hub markets under your deltas. Params (all optional, pass at least one delta): avg_kwh_cents_pct (power-price % change, e.g. 30), time_to_power_months_delta (months added/removed), queue_wait_months_delta, reserve_margin_pct_delta (points), curtailment_pct_delta (points), market (one slug, e.g. abilene), top_n (default 10, max 25 — ranked by |score change|). Returns per-market baseline vs scenario composite + component breakdown + the EXACT formula/weights in every response (transparent scenario_composite — deliberately NOT the DCPI). Keyless callers get a top-3 preview; any live key (claim_free_key) returns up to 25. Answers "what happens to the ranking if power prices jump 30%", "which markets survive a tighter build rate". Try: simulate_scenario avg_kwh_cents_pct=30 top_n=10. Do NOT use for the present-day ranking (use rank_markets) or trajectory extrapolation (use predict_market_trajectory); this answers explicit hypotheticals.

Input Schema

Name	Required	Description
`top_n`	No	Markets to return, ranked by \|score delta\| (default 10)
`market`	No	Score ONE market by slug (optional), e.g. abilene — slugs from rank_markets
`avg_kwh_cents_pct`	No	Power price % change, e.g. 30 for +30% or -20 for -20%
`curtailment_pct_delta`	No	Percentage POINTS added/removed from curtailment
`queue_wait_months_delta`	No	Months added/removed from interconnection queue wait
`reserve_margin_pct_delta`	No	Percentage POINTS added/removed from reserve margin, e.g. -5
`time_to_power_months_delta`	No	Months added (+) or removed (-) from time-to-power, e.g. 12

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
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Removed value: -{
-  "type": "string"
-}
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- removedOutput schema / properties / _front_door
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Removed value: -{
-  "type": "object"
-}
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- removedOutput schema / properties / _return_loop
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Removed value: -{
-  "type": "object"
-}
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- removedOutput schema / properties / citation
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Removed value: -{}
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- removedOutput schema / properties / provenance
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Removed value: -{
-  "type": "object"
-}
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- removedOutput schema / properties / quota
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Removed value: -{
-  "type": "object"
-}
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- removedOutput schema / properties / site_evaluation_handoff
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Removed value: -{}
```

Changed19 schema fields changedOct 18, 2026

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

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

removedOutput schema / properties / quota / properties
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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

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

AddedJul 19, 2026

TDQS

A4.8/5.0

Behavior5/5

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

Annotations already cover safety (readOnly/idempotent/non-destructive), and the description adds substantial context beyond them: keyless callers get a top-3 preview while any live key (claim_free_key) returns up to 25, and every response carries the exact formula/weights, deliberately distinct from the DCPI. This is behavioral detail the annotations cannot express.

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-loaded with the trigger and the routing constraints, and every clause carries weight (examples, key tiers, alternatives). It is dense and long, but for a 7-param simulation tool with tiered access the density is largely earned rather than padding.

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?

An output schema exists, so return-value detail is not required, yet the description still signals the rank-by-delta ordering and the transparent formula. Trigger, exclusions, parameter constraints, and access tiers are all covered, leaving nothing an agent needs to call it correctly.

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%, so the baseline is 3, but the description adds value the schema does not: all params are optional and at least one delta must be passed, top_n defaults to 10 (max 25) ranked by |score change|, and worked examples (30, 12, -5). It clarifies intent beyond the raw field descriptions.

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 and resource: re-scores 300+ DC Hub markets under supplied deltas to produce what-if rankings. It explicitly names what it is not (rank_markets for present-day, predict_market_trajectory for extrapolation), so an agent can distinguish it from siblings without opening schemas.

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 ('when the user asks how data center power market rankings change under what-if conditions'), explicit exclusions ('Do NOT use for the present-day ranking... or trajectory extrapolation'), and names the correct sibling for each alternative. Nothing is left to inference.

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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