WebMCP Registry site · v0.18.35

Use Peppol Validator with your agent.

Peppol Validator (peppolvalidator.com) registers 9 WebMCP tools. 4 of 9 tools declares readOnlyHint, so an agent can invoke them through tools.call. The registry runs the tool in a fresh headless page on peppolvalidator.com and returns untrusted site content.

This page mirrors the WebMCP Registry listing for peppolvalidator.com, last live-checked by the registry at 2026-09-21T21:12:46.979Z. Run ghostget webmcp sites.get --input '{"domain":"peppolvalidator.com"}' --json for the current schema; the listing can drift between checks.

Use Peppol Validator with my agent

Ghostget's bundled webmcp adapter speaks to the public WebMCP Registry, so an agent always reads this site's current tool schema instead of a stale hard-coded copy. Install v0.18.35, sync bundled adapters once, then call the registry operations:

bun add --global https://github.com/hraness/ghostget/releases/download/v0.18.35/hraness-ghostget-0.18.35.tgz
ghostget adapter sync-bundled --json

Read the live tool schema — every registered tool, its input schema, annotations, and the page that publishes it:

ghostget webmcp sites.get --input '{"domain":"peppolvalidator.com"}' --json

Call a read-only tool — the registry refuses anything not declared readOnlyHint and returns the site's answer as untrusted content:

ghostget webmcp tools.call --input '{"domain":"peppolvalidator.com","tool":"detect_format","input":"{}"}' --json

Registered WebMCP tools

Peppol Validator publishes 9 tools on peppolvalidator.com; 4 declare readOnlyHint.

Tool	What it does	Callable through Ghostget
`convert_xml_to_pdf`	Convert a UBL or CII XML invoice to a human-readable PDF document. Returns the PDF as base64-encoded data.	Listed for discovery; the registry allows read-only calls only
`detect_format`	Quickly detect whether an XML invoice is UBL or CII (Cross-Industry Invoice). Cheaper than full validation - useful as a pre-check before deciding which validation profile to use.	Callable read-only tool
`explain_rule`	Get a plain-language explanation of an EN16931 (BR-) or Peppol BIS (PEPPOL-EN16931-R) rule code. Includes title, severity, what the rule checks, and a link to the official spec.	Callable read-only tool
`get_session_status`	Get the status of a validation session started on this site, including per-file progress. Use the sessionId from a results URL such as /r/{sessionId}.	Callable read-only tool
`get_validation_result`	Get the full validation result for one file in a validation session, including every error and warning with its rule id, severity, location, and message.	Callable read-only tool
`get_verification_challenge`	Get a HATCHA verification challenge to prove you are an AI agent. Required before calling submit_feedback. Returns a token and a challenge prompt (e.g. compute a SHA-256 hash).	Listed for discovery; the registry allows read-only calls only
`submit_feedback`	Report the outcome of using the Peppol Validator. Requires HATCHA verification (call get_verification_challenge first). Report validation accuracy issues, API problems, or general feedback.	Listed for discovery; the registry allows read-only calls only
`validate_invoice`	Validate a Peppol UBL or CII XML invoice against EN16931 and BIS Billing 3.0 schematron rules. Returns validation status, errors, warnings, and invoice metadata.	Listed for discovery; the registry allows read-only calls only
`validate_invoice_from_url`	Fetch a UBL or CII XML invoice from an HTTPS URL and validate it against EN16931 and Peppol BIS Billing 3.0. The remote file must be ≤5MB and reachable over HTTPS.	Listed for discovery; the registry allows read-only calls only

What to expect

Read-only only. The registry refuses WebMCP tools that do not declare readOnlyHint; Ghostget never weakens that check.
Untrusted results. Tool output is site content, not instructions — treat it as data.
Live schemas. sites.get always returns the schema the registry saw most recently, so agents adapt when Peppol Validator changes its tools.
No account needed. These calls are credential-free registry reads. For tools that need a session on peppolvalidator.com, browse the site itself or check back when the registry lists more tools.