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by io.chainhelix.mcp
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options_skew

Read-only

Bitcoin and Ether options volatility surface from Deribit by expiry horizon: short = expiries 0 to 7 days out, front = 8 to 30 days, mid = 31 to 90 days, long = over 90 days. At the money, put and call implied volatility, risk reversal, butterfly, open interest, as the newest hourly average against 24 hours earlier within the same moneyness band definition (bandVersion). Each hour is published about 90 minutes after it ends; asOf is the start of the hour. Price: 2 cents per call.

Input Schema

NameRequiredDescriptionDefault
horizonNoExpiry horizon: short = 0 to 7 days, front = 8 to 30 days, mid = 31 to 90 days, long = over 90 days; absent = all four. Example: front
currencyNoBTC or ETH; absent = both. Example: BTC

Output Schema

NameRequiredDescriptionDefault
resultsYes
dataGapsNoPresent only when the window of the answer overlaps a recorded data gap. Figures inside each listed period are incomplete. periods are the recorded gaps (end null while still open); atCall is measured against the window of this call and is left out of meta.contentHash.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • addedInput schema / properties / currency / description
      Added value: +"BTC or ETH; absent = both. Example: BTC"
    • addedInput schema / properties / horizon / description
      Added value: +"Expiry horizon: short = 0 to 7 days, front = 8 to 30 days, mid = 31 to 90 days, long = over 90 days; absent = all four. Example: front"
  2. Changed1 schema field changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"670f7504e3de5031beccee25a2d24e4515f68b893295f6d5b0d3a0665498b2c9"New value: +"25cc80db6d8e9eac73d47a50f7ad6333a21f1972d008a8fed0159de8bfb4b519"
  3. Changed2 schema fields changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"e5b4290024a229f2bdf97f8fc6a0079c3fe13b77267f41fdcffeb8b26aa1c41e"New value: +"670f7504e3de5031beccee25a2d24e4515f68b893295f6d5b0d3a0665498b2c9"
    • changedInput schema / x-lexicon / version
      Previous value: -"0.1.0"New value: +"0.2.0"
  4. Changed4 schema fields changed
    • addedInput schema / additionalProperties
      Added value: +false
    • addedOutput schema / properties / dataGaps
      Added value: +{
+  "additionalProperties": false,
+  "description": "Present only when the window of the answer overlaps a recorded data gap. Figures inside each listed period are incomplete. periods are the recorded gaps (end null while still open); atCall is measured against the window of this call and is left out of meta.contentHash.",
+  "properties": {
+    "gaps": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "atCall": {
+            "additionalProperties": false,
+            "properties": {
+              "note": {
+                "type": "string"
+              },
+              "periodsInWindow": {
+                "items": {
+                  "additionalProperties": false,
+                  "properties": {
+                    "end": {
+                      "type": "number"
+                    },
+                    "ongoing": {
+                      "type": "boolean"
+                    },
+                    "start": {
+                      "type": "number"
+                    }
+                  },
+                  "required": [
+                    "start",
+                    "end"
+                  ],
+                  "type": "object"
+                },
+                "type": "array"
+              },
+              "shareOfWindowPct": {
+                "type": "number"
+              },
+              "windowEnd": {
+                "type": "number"
+              },
+              "windowStart": {
+                "type": "number"
+              }
+            },
+            "required": [
+              "windowStart",
+              "windowEnd",
+              "periodsInWindow",
+              "shareOfWindowPct",
+              "note"
+            ],
+            "type": "object"
+          },
+          "chain": {
+            "type": "string"
+          },
+          "data": {
+            "type": "string"
+          },
+          "periods": {
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "end": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "ongoing": {
+                  "type": "boolean"
+                },
+                "start": {
+                  "type": "number"
+                }
+              },
+              "required": [
+                "start",
+                "end"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "records": {
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "lost": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "lostUnit": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "record": {
+                  "type": "string"
+                },
+                "source": {
+                  "type": "string"
+                }
+              },
+              "required": [
+                "source",
+                "record"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "section": {
+            "type": "string"
+          },
+          "window": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "section",
+          "chain",
+          "data",
+          "window",
+          "periods",
+          "records",
+          "atCall"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "statement": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "statement",
+    "gaps"
+  ],
+  "type": "object"
+}
    • removedOutput schema / properties / meta
      Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "contentHash": {
-      "type": "string"
-    },
-    "generated": {
-      "type": "number"
-    },
-    "priceUsd": {
-      "type": "number"
-    },
-    "validUntil": {
-      "type": "number"
-    }
-  },
-  "type": "object"
-}
    • removedOutput schema / properties / receipt
      Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "bytes": {
-      "type": "number"
-    },
-    "covers": {
-      "type": "string"
-    },
-    "issuedAt": {
-      "type": "number"
-    },
-    "lookup": {
-      "type": "string"
-    },
-    "network": {
-      "type": [
-        "string",
-        "null"
-      ]
-    },
-    "nonce": {
-      "type": "string"
-    },
-    "seq": {
-      "type": "number"
-    },
-    "settleTx": {
-      "type": [
-        "string",
-        "null"
-      ]
-    },
-    "sha256": {
-      "type": "string"
-    },
-    "tool": {
-      "type": [
-        "string",
-        "null"
-      ]
-    }
-  },
-  "type": "object"
-}
  5. Changed1 schema field changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"a1c2e10fd3177d6b4d59ca78693e8fb36880165cf0f735f680dd86a510411178"New value: +"e5b4290024a229f2bdf97f8fc6a0079c3fe13b77267f41fdcffeb8b26aa1c41e"
  6. Changed1 schema field changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"1eeb782ee15fe69fc80776948e0556fa6b795e210e6305935b2c97b73d955cda"New value: +"a1c2e10fd3177d6b4d59ca78693e8fb36880165cf0f735f680dd86a510411178"
  7. Changed1 schema field changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"c014292cad7497ce9fd68c33345ac32cb42b672c8e77d6c749c26e162cc207e4"New value: +"1eeb782ee15fe69fc80776948e0556fa6b795e210e6305935b2c97b73d955cda"
  8. Changed3 schema fields changed
    • addedInput schema / x-aliases
      Added value: +{
+  "currency": [
+    "Currency"
+  ]
+}
    • addedInput schema / x-lexicon
      Added value: +{
+  "bundleSha256": "c014292cad7497ce9fd68c33345ac32cb42b672c8e77d6c749c26e162cc207e4",
+  "name": "ChainHelix Agentic Lexicon",
+  "resolve": "lexicon_resolve",
+  "spec": "lexicon_spec",
+  "version": "0.1.0"
+}
    • addedInput schema / x-vocab
      Added value: +{
+  "currency": "data.currency",
+  "horizon": "market.horizon"
+}
  9. Changed1 schema field changed
    • addedOutput schema / properties / results / items / properties / source
      Added value: +{
+  "type": [
+    "string",
+    "null"
+  ]
+}
  10. Changed2 schema fields changed
    • addedOutput schema / properties / meta
      Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "contentHash": {
+      "type": "string"
+    },
+    "generated": {
+      "type": "number"
+    },
+    "priceUsd": {
+      "type": "number"
+    },
+    "validUntil": {
+      "type": "number"
+    }
+  },
+  "type": "object"
+}
    • addedOutput schema / properties / receipt
      Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "bytes": {
+      "type": "number"
+    },
+    "covers": {
+      "type": "string"
+    },
+    "issuedAt": {
+      "type": "number"
+    },
+    "lookup": {
+      "type": "string"
+    },
+    "network": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "nonce": {
+      "type": "string"
+    },
+    "seq": {
+      "type": "number"
+    },
+    "settleTx": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "sha256": {
+      "type": "string"
+    },
+    "tool": {
+      "type": [
+        "string",
+        "null"
+      ]
+    }
+  },
+  "type": "object"
+}
  11. Changed1 schema field changed
    • addedOutput schema / properties / results / items / properties / bandVersion
      Added value: +{
+  "type": [
+    "number",
+    "null"
+  ]
+}
  12. Added

TDQS

A4.1/5.0
Behavior5/5

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

Annotations only declare readOnlyHint=true, but the description goes well beyond that: hourly publication roughly 90 minutes after the hour ends, asOf defined as the start of the hour, bandVersion semantics for the moneyness band definition, and an explicit price of 2 cents per call. Freshness, semantics and cost are exactly the traits an agent needs before invoking a paid data call.

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?

Content is front-loaded with the resource and segmentation, then metrics, comparison window, freshness and cost. It is dense but every sentence carries information; the only waste is the horizon definitions repeated verbatim from the schema.

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?

With an output schema present, the description needn't document return shape, and it covers venue, instruments, currencies, freshness, comparison window and price. It does not state how far back the hourly series goes or whether the call returns a single snapshot vs a series, which is a minor remaining gap for a paid endpoint.

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% and both parameters are enums with documented values and absent-behavior, so the description's restatement of the horizon bands largely duplicates the schema. It adds a little via the bandVersion/moneyness context but no format or usage nuance beyond the structured fields.

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 description names a precise resource (Bitcoin and Ether options volatility surface from Deribit), the axis it is sliced on (expiry horizon), and the exact metrics returned (ATM, put/call IV, risk reversal, butterfly, open interest). An agent can distinguish this from siblings like iv_summary or open_interest 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 Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is implied by the metric list and horizon segmentation, but there is no explicit 'use this when...' statement and no routing to alternatives such as iv_summary or open_interest for overlapping data. The horizon bands and the 24h comparison do tell the agent what analytical question this answers, which is more than nothing.

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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