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by io.chainhelix
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options_skew

Requires a ChainHelix API key as bearer token, or 2 cents per call paid over Binance b402 in USDT, USDC, USD1 or U on BNB Smart Chain, or over x402 in USDC on the Base network. 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

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
horizonNo
currencyNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
metaNo
receiptNo
resultsYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"a1c2e10fd3177d6b4d59ca78693e8fb36880165cf0f735f680dd86a510411178"New value: +"e5b4290024a229f2bdf97f8fc6a0079c3fe13b77267f41fdcffeb8b26aa1c41e"
  2. Changed1 schema field changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"1eeb782ee15fe69fc80776948e0556fa6b795e210e6305935b2c97b73d955cda"New value: +"a1c2e10fd3177d6b4d59ca78693e8fb36880165cf0f735f680dd86a510411178"
  3. Changed1 schema field changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"c014292cad7497ce9fd68c33345ac32cb42b672c8e77d6c749c26e162cc207e4"New value: +"1eeb782ee15fe69fc80776948e0556fa6b795e210e6305935b2c97b73d955cda"
  4. 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"
+}
  5. Changed1 schema field changed
    • addedOutput schema / properties / results / items / properties / source
      Added value: +{
+  "type": [
+    "string",
+    "null"
+  ]
+}
  6. 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"
+}
  7. Changed1 schema field changed
    • addedOutput schema / properties / results / items / properties / bandVersion
      Added value: +{
+  "type": [
+    "number",
+    "null"
+  ]
+}
  8. Added

TDQS

A3.5/5.0
Behavior4/5

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

With no annotations, the description carries the full behavioral burden and does so well: it discloses auth (ChainHelix key as bearer token or per-call payment of 2 cents over Binance b402/x402), the publication lag (each hour published ~90 minutes after it ends), and that asOf is the start of the hour. These are exactly the operational facts an agent needs and 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?

Information-dense and largely front-loaded, but the lengthy payment/metering preamble leads the description when the resource and horizon definitions are the more selection-relevant content. A single dense paragraph with no structural breaks.

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 auth, timing semantics, horizon definitions, and the bandVersion concept, which is complete for a read tool. Since an output schema exists, the metric explanations are bonus rather than required, and no return-format detail is missing.

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 description coverage is 0%, so the description must compensate, and it does for horizon by defining each band explicitly (short 0-7 days, front 8-30, mid 31-90, long over 90). Currency is only implied via 'Bitcoin and Ether options' mapping to the BTC/ETH enum, so it stops short of full coverage.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States the resource precisely (BTC and ETH options volatility surface from Deribit) and enumerates the delivered metrics: at-the-money IV, put/call IV, risk reversal, butterfly, open interest. This distinguishes it from adjacent siblings like iv_summary and open_interest by naming the specific skew bundle, though it never names an alternative directly and the opening payment sentence delays the purpose.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

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

There is no explicit when-to-use guidance, no prerequisites beyond the auth note, and no routing to alternatives such as iv_summary or open_interest. The horizon bands give parameter framing but not usage context.

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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