MCP server

Kya Brasil

io.github.celfons/kya-brasil

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

KYA backed by a real company: e-CNPJ-signed agent mandates, revocation-checked, signed verdicts

Website

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

15

Token cost

About 4,017 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http kya-brasil https://kya-br-agents.marcelfons.workers.dev/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.kya-brasil]
url = "https://kya-br-agents.marcelfons.workers.dev/mcp"

Gemini CLI

{"mcpServers":{"kya-brasil":{"httpUrl":"https://kya-br-agents.marcelfons.workers.dev/mcp"}}}

Cursor

{"mcpServers":{"kya-brasil":{"url":"https://kya-br-agents.marcelfons.workers.dev/mcp"}}}

VS Code

{"servers":{"kya-brasil":{"type":"http","url":"https://kya-br-agents.marcelfons.workers.dev/mcp"}}}

Antigravity

agy mcp add kya-brasil https://kya-br-agents.marcelfons.workers.dev/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"kya-brasil","server_url":"https://kya-br-agents.marcelfons.workers.dev/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"kya-brasil","server_url":"https://kya-br-agents.marcelfons.workers.dev/mcp"}

Tools

• kya_about ~71 tokens
  Free. What KYA Brasil is, how the credential flow works, prices, and where the schemas and signing keys are.
• kya_check_action ~434 tokens
  Signed verdict: is this action (action, amount, currency, counterparty, payment instrument) inside the agent's mandate and is the credential active? Evaluates the reserved mandate fields; lists the fields it did not evaluate.
• kya_company_agents ~242 tokens
  Free, company only. Every credential ever registered for your CNPJ, any status, whoever held the certificate (an accountant, another employee). Request signed with your e-CNPJ over "KYA Brasil: agents <cnpj>" + "at: <ISO time>".
• kya_company_webhook ~233 tokens
  Free, company only. Sets the https URL that receives signed events about your agents: credential issued, renewed, suspended, reinstated, revoked. Request signed with your e-CNPJ; url "-" removes it.
• kya_person_agents ~166 tokens
  Free, person only: every live credential behind your e-CPF and every CPF check made against each one. Sign "KYA Brasil: my agents\nat: <ISO time>" with the e-CPF (valid 10 minutes).
• kya_principal_match ~283 tokens
  Signed answer ($0.01) for a person's agent (principal.kind person): does the CPF you already have match the e-CPF holder behind it? On a match, a subject_ref of your own for that person (stable for you, different for every verifier). The CPF is never stored, published or revealed; 3 non-matching ans
• kya_prove ~338 tokens
  Free. Send both signatures of the challenge. The e-CNPJ chain is validated against ICP-Brasil roots, the CNPJ must match, the certificate must not be revoked (CRL) and the company must be ATIVA; then the credential is issued (90 days, Ed25519-signed).
• kya_register ~488 tokens
  Register an AI agent for a Brazilian company: agent key (EVM address or Web Bot Auth Ed25519 key), CNPJ and a mandate (JSON, validated against /.well-known/kya-mandate.schema.json). Returns a one-time challenge the agent signs with its key and the company signs with its e-CNPJ (CMS/PKCS#7). Price co
• kya_renew ~177 tokens
  Re-issue the credential for 90 more days. The company signs the renewal challenge with an e-CNPJ in force (not revoked); the company must still be ATIVA at the Receita.
• kya_renew_prove ~319 tokens
  Free. Second step of kya_renew: send both signatures of the renewal challenge; the credential is re-issued for 90 days if the e-CNPJ is not revoked and the company is still ATIVA.
• kya_revocations ~165 tokens
  Free. Credentials revoked since a date (default: last 30 days), for verifiers that cache credentials.
• kya_revoke Changes accounts · ~265 tokens
  Free. The company revokes the credential at once (e-CNPJ-signed request). Revocations are listed at /v1/revocations.
• kya_sign_link ~306 tokens
  Free. Link for whoever holds the company's e-CNPJ (owner, accountant): give challenge_id and the agent's signature, get the /sign URL. They see agent, company and mandate and sign in the browser (A1 .pfx) or with any ICP-Brasil signer (A3 token, cloud), or run kya-sign (npm @kya-brasil/agent-tools)
• kya_verify ~356 tokens
  Free (50/day per IP). The agent's current credential: principal company, mandate, status (active, suspended, revoked, expired) and signature. Also by key: /v1/agents/by-key?kind=&id=.
• kya_verify_paid ~174 tokens
  Same as the free verification, without daily limit, plus a signed receipt of the verification itself (what was checked, when). Pay per call with x402.

Browse

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