Japan Public Ledgers MCP

agent_identity_record

Append a hash-chained activity record (owner only). Optional provenance (repo/version/config) is self-reported.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "identityId": "<identityId>",
      "activityType": "<activityType>"
    },
    "name": "agent_identity_record"
  }
}

Input Schema

Name	Required	Description
`content`	No
`identityId`	Yes
`provenance`	No	Self-reported origin of the activity (NOT verified)
`activityType`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

First observedJun 17, 2026

TDQS

B3/5.0

Behavior4/5

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

With no annotations, the description discloses key traits: hash-chaining implies immutability and append-only behavior, 'owner only' scopes access, and provenance is self-reported and unverified. This provides good behavioral context beyond a simple 'append record'.

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?

The description is a single sentence, concise but not optimized for quick scanning. It front-loads the core action but omits important context like required parameters and record structure.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given 4 parameters (2 required), no output schema, and complex nested objects, the description is insufficient. It doesn't explain the content field, return value, error conditions, or how 'hash-chained' affects usage.

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 coverage is only 25% (provenance described). The description adds little beyond restating provenance as optional self-reported. The content, identityId, and activityType parameters remain undocumented in both schema and description, leaving ambiguity.

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?

The description clearly states the action (append) and resource (hash-chained activity record), and specifies 'owner only' which distinguishes it from tools like agent_identity_register or agent_audit_record.

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?

No guidance on when to use this tool versus alternatives. The phrase 'owner only' implies restricted scope but doesn't explain when not to use it or what alternatives exist for other users.

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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