# Use The One Thing with your agent.

[The One Thing](https://theonethingapp.com/) (`theonethingapp.com`) registers 7 WebMCP tools. 5 of 7 tools declares `readOnlyHint`, so an agent can invoke them through `tools.call`. The registry runs the tool in a fresh headless page on theonethingapp.com and returns untrusted site content.

This page mirrors the [WebMCP Registry](https://wmcp.ai/sites/theonethingapp.com) listing for `theonethingapp.com`, last live-checked by the registry at 2026-09-21T21:09:25.678Z. Run `ghostget webmcp sites.get --input '{"domain":"theonethingapp.com"}' --json` for the current schema; the listing can drift between checks.

## Use The One Thing 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":"theonethingapp.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":"theonethingapp.com","tool":"get_download_links","input":"{}"}' --json
```

## Registered WebMCP tools

The One Thing publishes 7 tools on theonethingapp.com; 5 declare `readOnlyHint`.

| Tool | What it does | Callable through Ghostget |
| --- | --- | --- |
| `get_download_links` | Returns a stable list of official app links. Pass all for iOS, Android and web, or select one platform. | Callable read-only tool |
| `get_journal_article` | Returns the title, summary, publication date, keywords and canonical URL for one published Journal article selected by its exact slug. | Callable read-only tool |
| `get_mcp_connection_details` | Returns the official remote OAuth MCP endpoint, documentation URL, authentication model, scopes and authenticated task-tool names. The task tools are not public marketing-site WebMCP tools. | Callable read-only tool |
| `get_product_overview` | Returns The One Thing product name, purpose, proposition, accessibility features, supported platforms, plan summaries and canonical homepage URL. | Callable read-only tool |
| `list_journal_articles` | Returns published Journal articles newest first. An optional topic performs a case-insensitive substring match across each title, description and keyword. | Callable read-only tool |
| `open_journal_article` | Navigates this browser tab to one published The One Thing Journal article selected by its exact slug. It does not change user data. | Listed for discovery; the registry allows read-only calls only |
| `open_task_app` | Navigates this browser tab to The One Thing web app sign-in or sign-up page. It does not sign in, read tasks or change task data. | 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 The One Thing changes its tools.
- **No account needed.** These calls are credential-free registry reads. For tools that need a session on theonethingapp.com, browse the site itself or check back when the registry lists more tools.