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discover_tools
Read-onlyIdempotent

Use this when you are unsure which DC Hub data center, power or grid tool fits: lists tools by family. Returns _entity=tool_families — a front_door block (execute_plan for any multi-capability question, get_changes to refresh) plus families with a when-to-use note + their tools (facility, market, grid_power, gas_btm, site_geometry, fiber, deals_news, saved_work, account_meta, partner), optionally filtered by a query. Then call the chosen tool (its full schema is in tools/list). This is a navigation layer, not the exhaustive catalog — tools/list stays canonical, and if you are BINDING a capability map, bind it from tools/list, not from here.

Input Schema

NameRequiredDescriptionDefault
queryNoOptional keyword to filter families/tools, e.g. "site selection", "grid queue", "fiber", "deals", "market"

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed7 schema fields changed
    • 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: -{}
  2. Changed19 schema fields changed
    • changedOutput schema / additionalProperties
      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
      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 / 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 / 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."
  3. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "additionalProperties": {},
+  "description": "DC Hub envelope: tool data fields ride at the top level beside these keys.",
+  "properties": {
+    "_entity": {
+      "description": "Payload class (facility|market|iso_grid|queue_results|deal|report|response); branch on it.",
+      "type": "string"
+    },
+    "_front_door": {
+      "additionalProperties": {},
+      "description": "First-tool hint: plan_query(intent) returns the ordered plan.",
+      "properties": {},
+      "type": "object"
+    },
+    "_return_loop": {
+      "additionalProperties": {},
+      "description": "Next-session delta call (get_changes).",
+      "properties": {},
+      "type": "object"
+    },
+    "citation": {
+      "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."
+    },
+    "provenance": {
+      "additionalProperties": {},
+      "description": "Source, method, as_of, verification_counts, license, cite_as; quote it when citing.",
+      "properties": {},
+      "type": "object"
+    },
+    "quota": {
+      "additionalProperties": {},
+      "description": "Caller quota state (remaining calls, tier).",
+      "properties": {},
+      "type": "object"
+    },
+    "site_evaluation_handoff": {
+      "anyOf": [
+        {
+          "items": {
+            "additionalProperties": {},
+            "properties": {},
+            "type": "object"
+          },
+          "type": "array"
+        },
+        {
+          "additionalProperties": {},
+          "properties": {},
+          "type": "object"
+        }
+      ],
+      "description": "Follow-up calls [{tool, parameters, why}] when the payload carries coordinates."
+    }
+  },
+  "type": "object"
+}
  4. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -{
-  "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": {
-      "anyOf": [
-        {
-          "additionalProperties": {},
-          "properties": {},
-          "type": "object"
-        },
-        {
-          "type": "string"
-        }
-      ],
-      "description": "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": {
-      "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"
-}New value: +null
  5. Changed2 schema fields changed
    • removedInput schema / $schema
      Removed value: -"http://json-schema.org/draft-07/schema#"
    • removedOutput schema / $schema
      Removed value: -"http://json-schema.org/draft-07/schema#"
  6. Changed5 schema fields changed
    • 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"
  7. Changed1 schema field changed
    • 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"
+}
  8. Changed5 schema fields changed
    • 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"
  9. Changed1 schema field changed
    • 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"
+}
  10. Added

TDQS

A4.4/5.0
Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so safety is covered. The description adds genuine beyond-annotation context: the returned _entity shape, a front_door block containing execute_plan and get_changes, and the caveat that this is a curated navigation layer rather than the canonical catalog. Return-value detail is partly redundant with the existing output schema, keeping this at 4 rather than 5.

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 when-to-use trigger and then the return shape, which is the right order. It runs long and restates the tools/list-is-canonical point twice (once as 'navigation layer, not the exhaustive catalog' and again as 'bind it from tools/list, not from here'), a minor redundancy that a single mention would cover.

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 discovery/routing tool with an output schema present, the description supplies everything an agent needs: when to invoke it, what it returns at a structural level, how to proceed afterward (call the chosen tool; its full schema is in tools/list), and the caveat about binding capability maps. Nothing material is missing.

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% for the single optional query parameter, so the schema already carries the semantics. The description's example keywords ('site selection', 'grid queue', 'fiber', 'deals', 'market') largely mirror the schema's own examples, adding little new meaning; baseline 3 is appropriate.

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 ('lists tools by family') and frames the tool's role as a 'navigation layer' rather than a data tool. It explicitly distinguishes itself from the canonical catalog (tools/list) and from execution tools (execute_plan), so an agent can place it without opening a 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?

Opens with the triggering condition ('Use this when you are unsure which ... tool fits') and closes with an explicit when-not and alternative: it is not the exhaustive catalog, tools/list stays canonical, and capability maps should be bound from tools/list rather than here. Both routing and exclusion are spelled out.

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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