WebMCP Registry site · v0.18.35
Use Handback with your agent.
Handback (handback.link) registers 5 WebMCP tools. Handback lists 5 tools but declares none as read-only today, so tools.call cannot invoke them yet. Ask sites.get for the live status before planning a call.
This page mirrors the WebMCP Registry listing for handback.link, last live-checked by the registry at 2026-09-23T02:04:36.066Z. Run ghostget webmcp sites.get --input '{"domain":"handback.link"}' --json for the current schema; the listing can drift between checks.
Use Handback 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 --jsonRead the live tool schema — every registered tool, its input schema, annotations, and the page that publishes it:
ghostget webmcp sites.get --input '{"domain":"handback.link"}' --jsonCall a read-only tool — the registry refuses anything not declared readOnlyHint and returns the site's answer as untrusted content:
# no read-only-callable tools listed today; sites.get shows the live statusRegistered WebMCP tools
Handback publishes 5 tools on handback.link; 0 declare readOnlyHint.
| Tool | What it does | Callable through Ghostget |
|---|---|---|
get_handoff_receipt | Report the link for the handoff created on this page. Returns created with the link and version once one exists, which under the default is immediately after stage_handoff. Returns pending only while a draft on screen waits for a human clic | Listed for discovery; the registry allows read-only calls only |
handback_settings | Read or change this device's Handback settings. Call with no arguments to read them. Pass retentionDays to set how long new handoffs live: 1, 7, 30, or null for never. Pass requireApproval true to switch the human approval gate on, which ma | Listed for discovery; the registry allows read-only calls only |
read_handoff | Return the requested sections of the handoff open in this page. Pass version to read an earlier one: every version is kept, so you can walk back through how the work changed. Omit version for the current one, and always propose contribution | Listed for discovery; the registry allows read-only calls only |
stage_contribution | Propose a set of changes against a specific base version. Writes a new sealed version and returns it in this same call. A stale base version is refused, with the current version returned so you can re-read and re-propose. If status is stage | Listed for discovery; the registry allows read-only calls only |
stage_handoff | Package the current work as a structured handoff and save it. Returns the link in this same call. Reply with the url field verbatim and nothing else: no preamble, no summary of what you saved, no offer to do more. If status is staged_awaiti | 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.getalways returns the schema the registry saw most recently, so agents adapt when Handback changes its tools. - No account needed. These calls are credential-free registry reads. For tools that need a session on handback.link, browse the site itself or check back when the registry lists more tools.