validate_a2a_trust_chain

SERVERAinumbers Mcp Apps SOURCEpostoaklabs/ainumbers-mcp-apps

Low RISK CLASS

Category Read

Parameters 40 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/postoaklabs-ainumbers-mcp-apps/validate-a2a-trust-chain.md

WHAT IT DOES

What validate_a2a_trust_chain does on Ainumbers Mcp Apps

AI agents call validate_a2a_trust_chain to retrieve information from Ainumbers Mcp Apps without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Parameter	Type	Required	Description
`compute`	string	—	Compute mode (v0.4 Compute Binding). "auto" (default) = server for gpu:false nodes with registered kernels; "server" = force server-side; "browser" = always ret
`parent_hashes`	array	—	execution_hash values from upstream ChainGraph AP2 artifacts to chain from (sets chain.parent_hashes in the export).
`parent_tool_ids`	array	—	tool_id values matching parent_hashes, in the same order.
`policy_parameters`	object	—	Input parameters for this tool's decision function. For gpu:false nodes with a registered kernel, these are computed server-side when compute is "auto" or "serv

Parameters from the server's own tool schema.

RISK

Why validate_a2a_trust_chain is rated Low

Validates trust chains without modifying data, storing information, or executing arbitrary code with side effects.

From the tool's definition validator, deterministic compute node, inputs processed transiently, not stored

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs validate_a2a_trust_chain safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Ainumbers Mcp Apps, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For validate_a2a_trust_chain, this is the rule to start with:

validate_a2a_trust_chain Allowed

validate_a2a_trust_chain is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "validate_a2a_trust_chain": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Ainumbers Mcp Apps, apply this rule, and every validate_a2a_trust_chain call is checked against it from then on.

FAQ

Questions about validate_a2a_trust_chain

What does the validate_a2a_trust_chain tool do? +

A2A Agent-Card Trust-Chain Validator: OpenChainGraph compute node (compliance_mandate). Regulatory deadline: 2026-08 (A2A at Linux Foundation (150+ orgs); EU AI Act Aug 2026 pushes agent KYA toward requirement.). Deterministic OpenChainGraph compute node. By default (compute:"auto") inputs are computed server-side on Cloudflare Workers for gpu:false nodes with a registered kernel; compute:"browser" forces client-side execution and returns a browser delegation URL instead. gpu:true nodes always delegate to the browser. Inputs are processed transiently to compute the response and are not stored, logged, or retained. Use synthetic or anonymised inputs only. Exports an AP2 artifact with execution_hash for chain provenance. Output feeds: art-04-agent-identity-attestation-checker, art-02-agent-spend-policy-simulator, ptg-01-ap2-prompt-template-generator. Open at: https://ainumbers.co/chaingraph/art-32-a2a-agent-card-trust-chain-validator.html FV-status (published/proven/still-trusted for this spec): /fv-status/8b5ae30d812cd234cfb6068c4ce2022f01d10f2a358979b0f0d73421e09d2543.json — a snapshot, not a subscription; this receipt verifies offline regardless of whether that file is ever fetched. It is categorised as a Read tool in the Ainumbers Mcp Apps MCP Server, which means it retrieves data without modifying state.

What parameters does validate_a2a_trust_chain accept? +

validate_a2a_trust_chain accepts 4 parameters: compute, parent_hashes, parent_tool_ids, policy_parameters. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on validate_a2a_trust_chain? +

Register the Ainumbers Mcp Apps MCP server in PolicyLayer and add a rule for validate_a2a_trust_chain: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Ainumbers Mcp Apps. Nothing to install.

What risk level is validate_a2a_trust_chain? +

validate_a2a_trust_chain is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit validate_a2a_trust_chain? +

Yes. Add a rate_limit block to the validate_a2a_trust_chain rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block validate_a2a_trust_chain completely? +

Set action: deny in the PolicyLayer policy for validate_a2a_trust_chain. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides validate_a2a_trust_chain? +

validate_a2a_trust_chain is provided by the Ainumbers Mcp Apps MCP server (postoaklabs/ainumbers-mcp-apps). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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