An entry is only as true as the day it was written.

Before you submit the plugin to the directory, run `claude plugin validate ./expense-reports`, then select **Validate** in the [developer portal](https://claude.ai/directory/manage). The portal runs every validation check, and [Run the che…

Before you submit the plugin to the directory, run `claude plugin validate ./expense-reports`, then select **Validate** in the [developer portal](https://claude.ai/directory/manage). The portal runs every validation check, and [Run the che…

| Hooks | `hooks/hooks.json` | Hook configuration |

When `inferenceModels` is unset, Claude Desktop on 3P populates the model picker from your gateway's `GET /v1/models` response. Auto-discovery shows only models whose IDs are recognizably Claude. Set [`inferenceModels`](/docs/third-party/c…

[`builtinBrowserDefaultDomainPolicy`](/docs/third-party/claude-desktop/configuration#builtinbrowserdefaultdomainpolicy) decides whether Claude can open every site except the ones you block, or only the sites you allow. Under either value, …

3. For slides, start from `assets/slide-template.md`.

3. For slides, start from `assets/slide-template.md`.

if (document.fullscreenElement) document.exitFullscreen(); else rootRef.current.requestFullscreen().catch(() => {});

* [`useHostStyles(app, hostContext)`](https://modelcontextprotocol.github.io/ext-apps/api/functions/_modelcontextprotocol_ext-apps_react.useHostStyles.html) applies the theme, variables, and fonts and re-applies on `hostcontextchanged`

Use [`registerAppTool`](https://modelcontextprotocol.github.io/ext-apps/api/functions/server-helpers.registerAppTool.html) to register the tool, and return the key in `structuredContent` alongside your normal tool output. A per-process cou…

/plugin marketplace add modelcontextprotocol/ext-apps

Go to [**Settings > Developer**](https://claude.ai/desktop/settings/desktop/developer) and click **Edit Config**.

* [Design guidelines](/docs/connectors/building/mcp-apps/design-guidelines#interaction-patterns): which interactions belong in your app and which belong in chat

All external origins are blocked by default. Declare the origins each `ui://` resource needs through `_meta.ui.csp`:

All external origins are blocked by default. Declare the origins each `ui://` resource needs through `_meta.ui.csp`:

Set `_meta.ui.prefersBorder` to `true` or `false` to control whether your content renders with a border. If you don't set it, content renders borderless on web and bordered on mobile.

* [`readOnlyHint`](https://modelcontextprotocol.io/specification/latest/schema#toolannotations-readonlyhint): the tool only reads data

| Maximum tool result size | \~150,000 characters | 25,000 tokens, configurable with `MAX_MCP_OUTPUT_TOKENS` |

* Support CIMD instead. Claude selects CIMD only when your authorization server metadata advertises both `"client_id_metadata_document_supported": true` and `"none"` in `token_endpoint_auth_methods_supported`. The second is required becaus…

* **URL pattern**: you give an anchored regular expression that every customer's URL must match, such as `^https://[a-z0-9-]+\.mcp\.example\.com/mcp$`. Each user enters their own URL when they connect, and Claude accepts it only if it matc…

* **URL pattern**: you give an anchored regular expression that every customer's URL must match, such as `^https://[a-z0-9-]+\.mcp\.example\.com/mcp$`. Each user enters their own URL when they connect, and Claude accepts it only if it matc…