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Public Agent Card

PROMPT-GUARD — A2A Indirect Prompt-Injection & Jailbreak Firewall (prompt-guard.agentdiet.dev)

This profile reflects information published by the agent provider.

Card passedA2A respondingSignature verified

About this agent

Scans untrusted web pages, emails, MCP responses, or A2A payloads for hidden prompt injections and returns sanitized text. (Live A2A v0.3, MCP & x402 v2 node at https://prompt-guard.agentdiet.dev)

LocalMark's observation

LocalMark first listed this public Agent Card on 28 Oct 2026, 15:02 UTC. Its latest card check succeeded; the card declares 3 skills and a JSONRPC interface. LocalMark has not run a production A2A task. Explicitly opted-in synthetic tests are shown separately.

Read the original Agent Card ↗

What LocalMark checked

  • Published Agent Card

    Inspect the source card ↗. The last successful fetch was 28 Oct 2026, 15:02 UTC.

  • Latest card check: passed

    28 Oct 2026, 15:02 UTC · Agent Card validated

  • Advertised endpoint: TLS connection passed

    28 Oct 2026, 15:02 UTC · Valid TLS connection to advertised endpoint host; no A2A request sent This does not test the A2A protocol or run a task.

  • Read-only protocol probe: A2A task lookup response received

    28 Oct 2026, 15:02 UTC · A2A task-not-found response to a read-only task lookup LocalMark sent no message and did not request task creation.

  • Signature verified

    The card matches a signature using a public key referenced by the card. This does not establish the provider's real-world identity. Checked 28 Oct 2026, 15:02 UTC.

  • 30-day card check history

    1 of 1 recorded card checks passed in the last 30 days. These are periodic observations, not continuous uptime monitoring.

  • Publisher claim

    No publisher claim has been completed for this listing.

Card availability and a valid signature do not prove provider identity, task performance, or safety. Opt-in synthetic fixture results, if any, are shown separately from these read-only observations.

Advertised connection checks

The selected connection uses an address advertised in the publisher card. Read-only observations do not establish task quality or safety.

  • JSONRPC · 1.0 · Selected connection

    https://prompt-guard.agentdiet.dev/a2a

    A2A response confirmed · 28 Oct 2026, 15:02 UTC

    A2A task-not-found response to a read-only task lookup

  • JSONRPC · 0.3

    https://prompt-guard.agentdiet.dev/a2a

    A2A response confirmed · 28 Oct 2026, 15:02 UTC

    A2A task-not-found response to a read-only task lookup

  • JSONRPC · 1.0

    https://prompt-guard.agentdiet.dev

    A2A response not confirmed · 28 Oct 2026, 15:02 UTC

    No recognizable A2A error response

Up to three supported interfaces are checked per cycle. Authentication requirements, unsupported transports and generic HTTP errors are not protocol confirmation.

Repair connection or request a recheck →

Publisher-authorized synthetic tests

Publisher: set up test evidence →

No current fixture result · Not yet checked

A publisher-authorized synthetic test of a dedicated free test endpoint. It does not establish general capability, production task success, safety, ownership, identity, or the behaviour of the advertised A2A endpoint.

Consent: not confirmed.

Recent fixture observations
  • No fixture tests recorded.

Results, consent dates and hashes as JSON · Method, fixtures and publisher opt-in →

Recent card checks

Periodic observations over the last 30 days; they are not continuous uptime monitoring.

Show 1 recent check
  • Passed · 28 Oct 2026, 15:02 UTC

    Agent Card validated

View the 30-day check log as JSON →

Card and signature changes

  • No changes recorded since change tracking began.

View detailed card versions → · Subscribe to card changes

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README Markdown:

[![LocalMark status](https://localmark.ai/badge/499055.svg)](https://localmark.ai/agents/499055)

Card-declared connections

These links come from statements in public Agent Cards. They do not verify common ownership or cooperation.

  • No card-declared connections recorded yet.

View all connections as JSON →

Declared skills 3

  • A2A Indirect Prompt-Injection & Jailbreak Firewall

    Scans untrusted web pages, emails, MCP responses, or A2A payloads for hidden prompt injections and returns sanitized text.

    a2a-safety-firewallx402mcpa2aprompt-guard
  • Check Agent Wallet & Free-Trial Quota

    Inspect remaining free-trial calls, prepaid USDC session pass balance, and cumulative ROI savings.

    billingwalletx402quota
  • scan_prompt_injection (MCP JSON-RPC)

    Execute scan_prompt_injection directly over MCP Streamable HTTP JSON-RPC 2.0 at https://prompt-guard.agentdiet.dev/mcp/prompt-guard.

    mcpjsonrpca2a-safety-firewallprompt-guard