Agent Decision & Evidence Tools (MCP + x402)

Contract or wallet classification

contract_info

Read-only

Inspect live runtime bytecode, native balance, transaction count and observed block, returning deployed_contract, eoa_or_empty or precompile_or_system_address without claiming wallet ownership.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`chain`	No		base
`address`	Yes

Output Schema

TableJSON Schema

Name	Required	Description
`tool`	No
`chain`	No
`error`	No
`address`	No
`charged`	No	When present on an error, false means the failed result is uncharged.
`message`	No
`missing`	No
`receipt`	No
`settled`	No	When present on an error, false means no settlement occurred.
`sources`	No
`unknown`	No
`accepted`	No
`contract`	No
`read_only`	No
`retryable`	No
`checked_at`	No
`error_code`	No
`extensions`	No
`balance_wei`	No
`is_contract`	No
`status_code`	No
`account_type`	No
`did_you_mean`	No
`native_symbol`	No
`balance_native`	No
`bytecode_bytes`	No
`missing_checks`	No
`observed_block`	No
`partial_evidence`	No
`transaction_count`	No
`classification_note`	No
`has_deployed_bytecode`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed6 schema fields changedSep 6, 2026

addedInput schema / additionalProperties
```
Added value: +false
```
addedInput schema / properties / address / pattern
```
Added value: +"^0x[a-fA-F0-9]{40}$"
```
removedInput schema / properties / address / title
```
Removed value: -"Address"
```
removedInput schema / properties / chain / title
```
Removed value: -"Chain"
```

removedInput schema / title

Removed value: -"contract_info_toolArguments"

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "anyOf": [
+    {
+      "required": [
+        "contract",
+        "chain",
+        "read_only",
+        "checked_at",
+        "sources",
+        "address",
+        "account_type",
+        "is_contract",
+        "has_deployed_bytecode",
+        "classification_note",
+        "bytecode_bytes",
+        "native_symbol",
+        "balance_wei",
+        "balance_native",
+        "transaction_count",
+        "observed_block",
+        "receipt",
+        "extensions"
+      ]
+    },
+    {
+      "required": [
+        "error"
+      ]
+    }
+  ],
+  "description": "Structured result contract for contract_info. 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"
+    },
+    "account_type": {
+      "type": "string"
+    },
+    "address": {
+      "type": "string"
+    },
+    "balance_native": {
+      "type": "string"
+    },
+    "balance_wei": {
+      "type": "string"
+    },
+    "bytecode_bytes": {
+      "type": "integer"
+    },
+    "chain": {
+      "type": "string"
+    },
+    "charged": {
+      "description": "When present on an error, false means the failed result is uncharged.",
+      "type": "boolean"
+    },
+    "checked_at": {
+      "type": "string"
+    },
+    "classification_note": {
+      "type": "string"
+    },
+    "contract": {
+      "type": "string"
+    },
+    "did_you_mean": {
+      "additionalProperties": true,
+      "type": [
+        "object",
+        "null"
+      ]
+    },
+    "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"
+    },
+    "has_deployed_bytecode": {
+      "type": "boolean"
+    },
+    "is_contract": {
+      "type": [
+        "boolean",
+        "null"
+      ]
+    },
+    "message": {
+      "type": "string"
+    },
+    "missing": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "missing_checks": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "native_symbol": {
+      "type": "string"
+    },
+    "observed_block": {
+      "type": "integer"
+    },
+    "partial_evidence": {
+      "additionalProperties": true,
+      "type": "object"
+    },
+    "read_only": {
+      "type": "boolean"
+    },
+    "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"
+    },
+    "retryable": {
+      "type": "boolean"
+    },
+    "settled": {
+      "description": "When present on an error, false means no settlement occurred.",
+      "type": "boolean"
+    },
+    "sources": {
+      "items": {},
+      "type": "array"
+    },
+    "status_code": {
+      "type": "integer"
+    },
+    "tool": {
+      "type": "string"
+    },
+    "transaction_count": {
+      "type": "integer"
+    },
+    "unknown": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    }
+  },
+  "type": "object"
+}

AddedSep 6, 2026

TDQS

A3.9/5.0

Behavior4/5

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

Beyond the readOnlyHint annotation, the description adds that data is 'live' and that the tool does not claim wallet ownership, which is a behavioral limitation. It discloses what is inspected (bytecode, balance, tx count, block) without contradicting annotations.

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?

A single dense sentence delivers purpose, inputs, and output classification with no filler. The caveat about ownership is appended without bloating the description.

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 description covers the key behavioral aspects and output classification, and the output schema fills in return-value details. It does not explicitly map the `chain` parameter to network selection, but the enum in the schema makes that unambiguous.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the burden falls on the description to explain parameters, but it does not mention `address` or `chain` at all. The address format and chain enum in the schema carry the semantics, but the description adds no parameter-level guidance.

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 uses a specific verb 'Inspect' with concrete resources (runtime bytecode, native balance, transaction count, observed block) and names the exact classification outputs. This clearly distinguishes it from sibling read-only tools like wallet_balance by focusing on classification rather than raw balances.

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?

The use case is implied through the return values: an address is classified as deployed_contract, eoa_or_empty, or precompile_or_system_address. However, there is no explicit guidance on when to choose this over alternatives like token_status or rpc_read_batch, nor any 'use this instead' language.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

All Agent Decision & Evidence Tools (MCP + x402) tools Inspect

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