Agent Decision & Evidence Tools (MCP + x402)

Archived market history

market_history

Read-only

Return the service's own archived gas, yield, commodity or market-brief series as raw observations or daily medians. At least two usable points must remain after the requested resolution; an empty, one-point or incompletely readable archive returns an uncharged error and is never sold as a time series.

Input Schema

TableJSON Schema

Name	Required	Default
`days`	No
`product`	Yes
`resolution`	No	raw

Output Schema

TableJSON Schema

Name	Required	Description
`rule`	No
`tool`	No
`unit`	No
`error`	No
`stats`	No
`points`	No
`charged`	No	When present on an error, false means the failed result is uncharged.
`message`	No
`missing`	No
`product`	No
`receipt`	No
`settled`	No	When present on an error, false means no settlement occurred.
`unknown`	No
`accepted`	No
`retryable`	No
`disclaimer`	No
`error_code`	No
`extensions`	No
`resolution`	No
`status_code`	No
`window_days`	No
`did_you_mean`	No
`coverage_note`	No
`missing_checks`	No
`partial_evidence`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed9 schema fields changedSep 6, 2026

addedInput schema / additionalProperties
```
Added value: +false
```
addedInput schema / properties / days / maximum
```
Added value: +365
```
addedInput schema / properties / days / minimum
```
Added value: +1
```
removedInput schema / properties / days / title
```
Removed value: -"Days"
```
removedInput schema / properties / product / title
```
Removed value: -"Product"
```
addedInput schema / properties / resolution / enum
```
Added value: +[
+  "raw",
+  "daily"
+]
```
removedInput schema / properties / resolution / title
```
Removed value: -"Resolution"
```

removedInput schema / title

Removed value: -"market_history_toolArguments"

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "anyOf": [
+    {
+      "required": [
+        "product",
+        "unit",
+        "window_days",
+        "resolution",
+        "points",
+        "stats",
+        "rule",
+        "coverage_note",
+        "disclaimer",
+        "receipt",
+        "extensions"
+      ]
+    },
+    {
+      "required": [
+        "error"
+      ]
+    }
+  ],
+  "description": "Structured result contract for market_history. A success satisfies the documented success branch. A domain or tool error includes error and is not a successful settlement; unpaid x402 requirements are carried by the transport wrapper.",
+  "properties": {
+    "accepted": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "charged": {
+      "description": "When present on an error, false means the failed result is uncharged.",
+      "type": "boolean"
+    },
+    "coverage_note": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "did_you_mean": {
+      "additionalProperties": true,
+      "type": [
+        "object",
+        "null"
+      ]
+    },
+    "disclaimer": {
+      "type": "string"
+    },
+    "error": {
+      "oneOf": [
+        {
+          "type": "string"
+        },
+        {
+          "additionalProperties": true,
+          "properties": {
+            "code": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "message": {
+              "type": "string"
+            },
+            "param": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "type": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "message"
+          ],
+          "type": "object"
+        }
+      ]
+    },
+    "error_code": {
+      "type": "string"
+    },
+    "extensions": {
+      "additionalProperties": true,
+      "properties": {
+        "delivery-receipt": {
+          "additionalProperties": true,
+          "properties": {
+            "how_to_verify": {
+              "type": "string"
+            },
+            "issued_at": {
+              "format": "date-time",
+              "type": "string"
+            },
+            "issuer": {
+              "type": "string"
+            },
+            "issuer_key": {
+              "type": "string"
+            },
+            "key_id": {
+              "type": "string"
+            },
+            "result_hash": {
+              "type": "string"
+            },
+            "service": {
+              "type": "string"
+            },
+            "signature": {
+              "type": "string"
+            },
+            "signed_message": {
+              "type": "string"
+            },
+            "standard": {
+              "const": "eucompliance-receipt/2",
+              "type": "string"
+            },
+            "subject": {
+              "type": "string"
+            },
+            "valid_until": {
+              "format": "date-time",
+              "type": "string"
+            },
+            "verify_url": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "standard",
+            "service",
+            "subject",
+            "result_hash",
+            "issued_at",
+            "valid_until",
+            "issuer",
+            "issuer_key",
+            "key_id",
+            "verify_url",
+            "how_to_verify",
+            "signature",
+            "signed_message"
+          ],
+          "type": "object"
+        }
+      },
+      "required": [
+        "delivery-receipt"
+      ],
+      "type": "object"
+    },
+    "message": {
+      "type": "string"
+    },
+    "missing": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "missing_checks": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "partial_evidence": {
+      "additionalProperties": true,
+      "type": "object"
+    },
+    "points": {
+      "items": {},
+      "type": "array"
+    },
+    "product": {
+      "type": "string"
+    },
+    "receipt": {
+      "additionalProperties": true,
+      "properties": {
+        "how_to_verify": {
+          "type": "string"
+        },
+        "issued_at": {
+          "format": "date-time",
+          "type": "string"
+        },
+        "issuer": {
+          "type": "string"
+        },
+        "issuer_key": {
+          "type": "string"
+        },
+        "key_id": {
+          "type": "string"
+        },
+        "result_hash": {
+          "type": "string"
+        },
+        "service": {
+          "type": "string"
+        },
+        "signature": {
+          "type": "string"
+        },
+        "signed_message": {
+          "type": "string"
+        },
+        "standard": {
+          "const": "eucompliance-receipt/2",
+          "type": "string"
+        },
+        "subject": {
+          "type": "string"
+        },
+        "valid_until": {
+          "format": "date-time",
+          "type": "string"
+        },
+        "verify_url": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "standard",
+        "service",
+        "subject",
+        "result_hash",
+        "issued_at",
+        "valid_until",
+        "issuer",
+        "issuer_key",
+        "key_id",
+        "verify_url",
+        "how_to_verify",
+        "signature",
+        "signed_message"
+      ],
+      "type": "object"
+    },
+    "resolution": {
+      "enum": [
+        "raw",
+        "daily"
+      ],
+      "type": "string"
+    },
+    "retryable": {
+      "type": "boolean"
+    },
+    "rule": {
+      "type": "string"
+    },
+    "settled": {
+      "description": "When present on an error, false means no settlement occurred.",
+      "type": "boolean"
+    },
+    "stats": {
+      "additionalProperties": true,
+      "type": "object"
+    },
+    "status_code": {
+      "type": "integer"
+    },
+    "tool": {
+      "type": "string"
+    },
+    "unit": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "unknown": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "window_days": {
+      "type": "integer"
+    }
+  },
+  "type": "object"
+}

AddedAug 3, 2026

TDQS

A4/5.0

Behavior4/5

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

Annotations already mark readOnlyHint=true and destructiveHint=false; the description goes further by disclosing that fewer than two usable points produce an uncharged error, and that incomplete archives are never sold as a series. This tells the agent that failure modes are billed differently and that results are only meaningful with sufficient data.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences deliver the core behavior and the key caveat with no padding; the primary action is front-loaded.

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?

The output schema exists, so return shape needs no description. Error behavior and minimum-point requirements are covered, but the acceptable product strings are only loosely enumerated, which is a real gap for a string parameter with no enum.

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?

With schema description coverage at 0%, the description must carry parameter meaning. It explains resolution by contrasting raw observations with daily medians and broadly scopes product to gas, yield, commodity, or market-brief. The days parameter remains unexplained, and no concrete product values are listed.

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 opens with a specific verb ('Return') and a scoped resource: the service's own archived gas, yield, commodity, or market-brief series. Mentioning 'archived' and 'the service's own' separates it from live-data siblings, and 'raw observations or daily medians' states the deliverable clearly.

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?

While the archived-vs-live distinction implies when to reach for this tool, no sibling is named and there is no explicit 'for live prices use spot_price' style guidance. The error condition provides a threshold for when not to trust results, but not which tool to choose instead.

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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