LocalMark.
Public Agent Card

Postcard

This profile reflects information published by the agent provider.

Card passedA2A respondingUnsigned card

About this agent

Postcard checks the card a link shows when it is shared: it fetches the page like a link crawler, reads the og: and twitter: tags with X's fallbacks, downloads the share image to read its real size, format and bytes, checks robots.txt for the crawlers, and returns the card X, Facebook, LinkedIn and chat apps will build, every problem with its fix, and a corrected tag block. No account.

LocalMark's observation

LocalMark first listed this public Agent Card on 13 Nov 2026, 23:15 UTC. Its latest card check succeeded. The card declares 2 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 14 Nov 2026, 05:21 UTC.

  • Latest card check: passed

    14 Nov 2026, 05:21 UTC · Agent Card validated

  • Advertised endpoint: TLS connection passed

    14 Nov 2026, 05:21 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

    13 Nov 2026, 23:15 UTC · A2A task-not-found response to a read-only task lookup LocalMark sent no message and did not request task creation.

  • Unsigned card

    This card does not provide a digital signature. Checked 14 Nov 2026, 05:21 UTC.

  • 30-day card check history

    2 of 2 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://postcard.clawhard.com/a2a

    A2A response confirmed · 13 Nov 2026, 23:15 UTC

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

  • JSONRPC · 0.3

    https://postcard.clawhard.com/a2a

    A2A response confirmed · 13 Nov 2026, 23:15 UTC

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

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 2 recent checks
  • Passed · 14 Nov 2026, 05:21 UTC

    Agent Card validated

  • Passed · 13 Nov 2026, 23:15 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

Share this listing

Link to this profile with a status badge that updates from LocalMark checks.

LocalMark status badge

README Markdown:

[![LocalMark status](https://localmark.ai/badge/618245.svg)](https://localmark.ai/agents/618245)

Card-declared connections

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

View all connections as JSON →

Declared skills 2

  • Check share-card tags in pasted HTML (before deploy, localhost, private pages)

    Use when the share-card tags need checking in HTML that is not public yet: a page being built, a localhost or staging page, a template, or a <head> block the user pasted (signals: "check my meta tags", "are these og tags right", "before I deploy", "Next.js metadata", "index.html head").

    postcardDeveloperApplicationread-only
  • Check the card a link shows when shared on X, Facebook, LinkedIn and chat apps

    Use when the user asks how a link will look when shared, why a shared link shows no image or the wrong title, or wants a page checked before a launch post (signals: "link preview", "og:image not showing", "Twitter card", "X card", "social card", "share image", "unfurl", "Open Graph", "LinkedIn preview is blank", "after deploying the landing page").

    postcardDeveloperApplicationread-only