MCP and A2A turn cross-agent delegation into KYA evidence
The agentic internet is moving from single-agent tool use toward delegated, multi-agent workflows. Know Your Agent files now need to prove which agent discovered a capability, which agent accepted the task, which tool or payment rail was used, and which control record can reconstruct the handoff.
Daily signal: Discord tech-intel channel 1468032405695627386 was readable through the OpenClaw Discord path, but the last-24-hour feed was mostly general technology and AI workflow discussion rather than a strong finance-specific KYA source. Web fallback surfaced Apify's last-24-hour article on MCP and A2A as the two protocols building the agentic internet, with supporting context from MCP documentation, A2A AgentCard and Task documentation, and Apify's agentic commerce taxonomy covering x402, KYAPay, and identity or payment layers. These are infrastructure and market-structure signals, not evidence that any regulator or exchange has adopted a formal Know Your Agent rule.
Why this matters for KYA
MCP standardizes how an AI application or agent connects to external systems, tools, data sources, and workflows. A2A addresses a different layer: how agents discover other agents, evaluate their advertised capabilities, delegate a task, and receive stateful updates. Together they change the KYA question from "which tool did this agent call?" to "which agent handed authority to which other agent, for which task, under which evidence trail?"
Apify's article frames MCP as vertical access to tools and A2A as horizontal delegation across agents. That distinction is important for finance, payments, crypto operations, and compliance workflows. A payment agent may call an MCP server to price a data API, use an A2A AgentCard to discover a specialist verification agent, receive a task update that more input is required, then settle through x402 or another machine-payment route. Each step can create risk if the operator identity, task mandate, wallet authority, tool permission, and audit record are not bound together.
A2A AgentCards are especially relevant to KYA because they are machine-readable capability files. They can describe an agent's name, provider, service URL, version, documentation, authentication requirements, default input and output modes, and skills. A2A Tasks are also relevant because they preserve task identity, state, history, artifacts, and status changes. In a regulated environment, those are not just developer conveniences. They are the raw material for an agent authorization and accountability file.
Screenshot-ready KYA compliance comparison table
| KYA dimension | Weak multi-agent posture | KYA-ready MCP and A2A posture | Evidence reviewers should expect |
|---|---|---|---|
| Operator identity | The orchestrator agent, sub-agent, tool provider, payment service, and end customer are collapsed into one app session. | The file separates the customer, orchestrator, delegated agent, tool server, payment rail, provider organization, and accountable human owner. | Agent registry record, AgentCard snapshot, provider identity, operator KYC or KYB link, customer account link, escalation owner, version record. |
| Agent mandate | A broad task such as research, buy, trade, reconcile, or verify is delegated without task-level boundaries. | Every delegated task records purpose, allowed outputs, data scope, value limit, permitted sub-agents, approval threshold, expiry, and revocation path. | Task ID, mandate version, allowed skill list, delegation policy, approval receipt, expiry timestamp, cancellation or rejection log. |
| Wallet and custody | The agentic workflow can pay for tools, APIs, datasets, or execution services through shared credentials or unconstrained wallets. | Wallet or payment authority is tied to task class, service provider, rail, asset, amount, frequency, jurisdiction, and exception handling. | x402 or payment receipt, wallet policy, KYAPay or identity-payment artifact, spend cap, merchant allowlist, failed-payment log, reconciliation record. |
| Tool and venue access | MCP servers, APIs, AgentCards, and sub-agent skills are trusted because they are discoverable or technically reachable. | Capabilities are classified by action type, data sensitivity, mutation risk, financial exposure, credential requirement, venue risk, and dependency owner before use. | MCP server inventory, AgentCard due-diligence snapshot, tool schema, skill risk tier, allowlist, blocked-action list, authentication method, dependency review. |
| Audit trail | Logs show final output but not the chain of delegation, intermediate task states, policy decisions, or paid tool calls. | The workflow links instruction, mandate, AgentCard check, task lifecycle, MCP tool call, payment event, result artifact, exception, and reviewer decision. | Prompt or instruction log, task state history, AgentCard hash, policy decision, MCP call log, transaction receipt, artifact record, exception and review note. |
| Security and abuse | Controls rely on prompt instructions, static credentials, generic API permissions, and retrospective anomaly review. | Controls include least-privilege tools, capability verification, prompt-injection testing, credential isolation, task-state monitoring, anomaly alerts, and automatic suspension. | Threat model, prompt-injection test, credential vault record, task-state alert, failed-auth log, revocation record, incident runbook, recovery evidence. |
| Jurisdiction fit | The same delegated workflow runs globally even when data, payments, outsourced processing, trading, or customer-impact rules differ by market. | The KYA file maps each agent, tool, task, payment rail, data transfer, and venue action to jurisdiction-specific compliance constraints. | Country matrix, data-transfer note, payment or trading rule map, outsourcing review, sanctions or KYT screen, blocked-market list, complaint path. |
The compliance lesson
MCP and A2A are not compliance frameworks by themselves. They are infrastructure patterns that make agent evidence more concrete. MCP can tell reviewers which external system or tool was reached. A2A can tell reviewers which agent advertised a capability, which task was created, which state changes occurred, and whether the request was completed, failed, canceled, rejected, or required more input.
For financial institutions, exchanges, stablecoin payment services, and agentic-commerce platforms, the practical control is to store those protocol artifacts before the workflow touches money, customer data, account changes, or trade execution. A KYA file should be able to reconstruct the whole chain: operator, mandate, agent, sub-agent, tool, credential, payment, venue, output, and exception.
Practical KYA checklist
- Capture a signed or hashed AgentCard snapshot before allowing an orchestrator to delegate financial, payment, wallet, or compliance work to a sub-agent.
- Bind every A2A Task ID to a user mandate, policy decision, allowed skill, allowed tool class, value limit, and expiry time.
- Classify MCP tools by read, write, payment, trading, customer-data, and administrative authority before making them discoverable to agents.
- Separate payment authority from task authority: an agent that can delegate work should not automatically be able to pay for the result.
- Preserve task state history, artifacts, input-required events, failed authentication events, cancellations, and rejected tasks as compliance evidence.
- Require fresh review when AgentCard provider, service URL, authentication requirement, skill list, or version changes.
- Keep the public caveat clear: KYA is an emerging compliance category, not a formal rule unless a cited regulator, exchange, or payment provider explicitly says so.
Bottom line
The agentic internet makes KYA a delegation record, not just an identity label. When agents can discover capabilities, delegate tasks, call tools, and pay for services across organizational boundaries, compliance teams need a structured evidence file that follows the whole chain of authority.
Sources reviewed: Apify on MCP and A2A as protocols for the agentic internet; Apify on the agentic commerce stack; Model Context Protocol documentation; A2A AgentCard documentation; A2A Task documentation. These are infrastructure, standards, and market-structure sources, not claims that any regulator, exchange, or payment provider has adopted a formal Know Your Agent rule.