aid: hakuto-0209-com
name: HaneruTo
description: >-
  HaneruTo — trading as hakuto, brand B612 SHEEP — is a Japanese one-person, AI-assisted web and systems
  development studio founded in 2025 that also ships b612, a Japanese-market code-review agent for AI coding
  assistants: review checklists by target type, industry presets with mandatory Japanese legal checkpoints
  (景表法 / 特商法 / 薬機法 / インボイス / 電帳法 / 宅建業法 / 介護保険法), failure patterns and 31
  deterministic detection rules — no LLM involved; the server has no input for customer source code.
  b612 is published two ways on mcp.hakuto-0209.com: a remote MCP server at /mcp (Streamable HTTP, protocol
  2025-06-18, ten tools with real inputSchemas, anonymous tools/list, keyless principles/rules) and an A2A
  0.3 agent whose EdDSA-signed card at /.well-known/agent-card.json declares six skills behind an x-b612-key
  licence header, with the signing key at /.well-known/jwks.json. No REST/OpenAPI surface, no SDK, no
  self-serve sign-up; agent access is a monthly flat-fee licence priced on contact.
image: https://hakuto-0209.com/assets/og.png
url: https://raw.githubusercontent.com/api-evangelist/hakuto-0209-com/refs/heads/main/apis.yml
x-type: company
x-source: harvest:a2a-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-09-19 (local-v3; was a2a-registry harvest stub)
specificationVersion: '0.20'
created: '2026-09-19'
modified: '2026-09-19'
tags:
- Agents
- MCP
- A2A
- Code Review
- Static Analysis
- Developer Tools
- Compliance
- Web Development
- Japan
- agent-native
tags_raw:
- Agents
- MCP
- A2A
- Code review
- Static analysis
- Developer tools
- Compliance
- Web development
- Japan
- Agent-native
apis:
- aid: hakuto-0209-com:b612-mcp-server
  name: b612 MCP Server
  description: >-
    Remote Model Context Protocol server at https://mcp.hakuto-0209.com/mcp (Streamable HTTP, POST only — GET
    returns 406 — protocol version 2025-06-18, serverInfo b612 0.1.0, hosted on Vercel). initialize and
    tools/list answer anonymously with ten tools, every one carrying a real inputSchema and
    execution.taskSupport "forbidden": b612_principles, b612_review_checklist, b612_patterns,
    b612_domain_preset, b612_rules, b612_design, b612_reference, b612_grow, b612_notes and b612_update.
    b612_principles was also callable without a key; the provider's quickstart configures the connection
    with an x-b612-key licence header (`claude mcp add --transport http b612 https://mcp.hakuto-0209.com/mcp
    --header "x-b612-key: <your key>"`). resources/list and prompts/list return -32601. The initialize
    instructions tell the agent to apply checklists and rules to code locally — no source code is sent to
    the server.
  humanURL: https://mcp.hakuto-0209.com/
  baseURL: https://mcp.hakuto-0209.com/mcp
  tags:
  - MCP
  - agent-native
  - Code Review
  properties:
  - type: MCPServer
    url: mcp/hakuto-0209-com-mcp.yml
  - type: MCPServer
    name: b612 MCP endpoint (Streamable HTTP)
    url: https://mcp.hakuto-0209.com/mcp
  - type: Documentation
    url: https://mcp.hakuto-0209.com/
- aid: hakuto-0209-com:b612-a2a-agent
  name: b612 A2A Agent
  description: >-
    Agent2Agent (A2A) protocol surface: an agent card served from
    https://mcp.hakuto-0209.com/.well-known/agent-card.json (protocolVersion 0.3, JSONRPC transport, version
    0.1.0, provider.organization HaneruTo) advertising six skills — principles, review-checklist, patterns,
    domain-preset, scan-code and rules — invoked as plain-text messages at the JSON-RPC endpoint
    https://mcp.hakuto-0209.com/a2a/v1 under an x-b612-key licence header (unkeyed requests get a 401
    `unauthenticated` envelope whose hint names principles and rules as keyless, 20 req/min per IP). The card
    carries an EdDSA JWS signature that verifies against the JWKS at /.well-known/jwks.json (kid
    b612-a2a-2026-09) and is also served unsigned at the legacy /.well-known/agent.json. Streaming and push
    notifications are declared unsupported.
  humanURL: https://mcp.hakuto-0209.com/
  baseURL: https://mcp.hakuto-0209.com/a2a/v1
  tags:
  - A2A
  - agent-native
  - Code Review
  properties:
  - type: AgentCard
    url: a2a/hakuto-0209-com-a2a.yml
  - type: AgentCard
    name: A2A Agent Card (provider-hosted, signed)
    url: https://mcp.hakuto-0209.com/.well-known/agent-card.json
  - type: Documentation
    url: https://mcp.hakuto-0209.com/terms
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://hakuto-0209.com/
- type: Documentation
  url: https://mcp.hakuto-0209.com/
- type: Pricing
  name: Company information and 特定商取引法 price disclosure (development service; agent licence priced on contact)
  url: https://hakuto-0209.com/legal/hakuto-company.html
- type: TermsOfService
  url: https://hakuto-0209.com/legal/hakuto-terms.html
- type: PrivacyPolicy
  url: https://hakuto-0209.com/legal/hakuto-privacy.html
- type: Support
  url: https://hakuto-0209.com/#contact
- type: AgentCard
  url: a2a/hakuto-0209-com-a2a.yml
- type: MCPServer
  url: mcp/hakuto-0209-com-mcp.yml
- type: WellKnown
  url: well-known/hakuto-0209-com-well-known.yml
- type: LLMsTxt
  url: llms/hakuto-0209-com-llms.txt
- type: Authentication
  url: authentication/hakuto-0209-com-authentication.yml
- type: Conventions
  url: conventions/hakuto-0209-com-conventions.yml
- type: ErrorCatalog
  url: errors/hakuto-0209-com-problem-types.yml
- type: RateLimits
  url: rate-limits/hakuto-0209-com-rate-limits.yml
- type: Plans
  url: plans/hakuto-0209-com-plans-pricing.yml
- type: Conformance
  url: conformance/hakuto-0209-com-conformance.yml
- type: Lifecycle
  url: lifecycle/hakuto-0209-com-lifecycle.yml
- type: AgenticAccess
  url: agentic-access/hakuto-0209-com-agentic-access.yml
- type: DomainSecurity
  url: security/hakuto-0209-com-domain-security.yml
- type: AITransparency
  url: https://mcp.hakuto-0209.com/terms
- type: DataSubjectRequest
  url: https://mcp.hakuto-0209.com/terms
- type: Subprocessors
  url: https://mcp.hakuto-0209.com/terms
x-enrichment:
  date: '2026-09-19'
  status: enriched
  artifacts_added: 18
  pass: local-v3