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3a9717e6beCo-authored-by: Claude Opus 4.6 <noreply@anthropic.com> Co-authored-by: Jeremiah Lowin <jlowin@users.noreply.github.com> Co-authored-by: Marvin Context Protocol <41898282+Marvin Context Protocol@users.noreply.github.com> Co-authored-by: voidborne-d <voidborne-d@users.noreply.github.com> Co-authored-by: marvin-context-protocol[bot] <225465937+marvin-context-protocol[bot]@users.noreply.github.com> Co-authored-by: Claude <noreply@anthropic.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: d 🔹 <258577966+voidborne-d@users.noreply.github.com> Co-authored-by: Jeremiah Lowin <153965+jlowin@users.noreply.github.com> Co-authored-by: nightcityblade <nightcityblade@gmail.com> Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com> Co-authored-by: Bill Easton <strawgate@users.noreply.github.com> Co-authored-by: Sumanshu Nankana <sumanshunankana@gmail.com> Co-authored-by: Eric Robinson <ericrobinson@indeed.com> Co-authored-by: Martim Santos <martimfasantos@gmail.com> Co-authored-by: d 🔹 <liusway405@gmail.com> Co-authored-by: Matthieu B <66959271+mtthidoteu@users.noreply.github.com> Co-authored-by: Sascha Buehrle <47737812+saschabuehrle@users.noreply.github.com> Co-authored-by: Hakancan <142545736+hkc5@users.noreply.github.com> Co-authored-by: nightcityblade <jackchen@haloailabs.com> Co-authored-by: Matt Hallowell <17804673+mhallo@users.noreply.github.com> Co-authored-by: nate nowack <thrast36@gmail.com> Co-authored-by: Bill Easton <williamseaston@gmail.com> Co-authored-by: Marcus Shu <46469249+shulkx@users.noreply.github.com> Co-authored-by: Rushabh Doshi <radoshi@gmail.com> Co-authored-by: AIKAWA Shigechika <shige@aikawa.jp> Co-authored-by: Jeremy Simon <simonjer805@gmail.com> Co-authored-by: Miguel Miranda Dias <7780875+pandego@users.noreply.github.com> Co-authored-by: Anthony James Padavano <padavano.anthony@gmail.com> Co-authored-by: Mostafa Kamal <hiremostafa@gmail.com> Fix auto-close MRE script posting comment without closing (#3386) Fix WorkOS token scope verification bypass 🤖 Generated with Codex (#3407) Fix initialize McpError fallthrough 🤖 Generated with Codex (#3413) Fix transform arg collisions with passthrough params (#3431) Fix get_* returning None when latest version is disabled (#3439) Fix get_* returning None when latest version is disabled (#3421) Fix server lifespan overlap teardown (#3415) Fix $ref output schema object detection regression (#3420) resolved annotations (#3429) Fix async partial callables rejected by iscoroutinefunction (#3438) Fix async partial callables rejected by iscoroutinefunction (#3423) fix: add version to components (#3458) fix: use intent-based flag for OIDC scope patch in load_access_token (#3465) Fixes #3461 fix: normalize Google scope shorthands and surface valid_scopes (#3477) fix: resolve ty 0.0.23 type-checking errors and bump pin (#3481) fix: shield lifespan teardown from cancellation (#3480) fix: forward custom_route endpoints from mounted servers (#3462) fix updates _get_additional_http_routes() to traverse providers, Fixes #3457 fix: remove hardcoded version from CLI help text (#3456) fix: monty 0.0.8 compatibility, drop external_functions from constructor (#3468) fix: task test teardown hanging 5s per test (#3499) Closes #3498 fix: validate workspace path is a directory before cursor install (#3440) Fixes #3426 fix: handle re.error from malformed URI templates in build_regex (#3501) fix: reject empty/OIDC-only required_scopes in AzureProvider (#3503) fix: restrict $ref resolution to local refs only (SSRF/LFI) (#3502) fix warnings and timeouts (#3504) close upgrade check issue when build passes (#3505) Closes #3484 fix: URL-encode path params to prevent SSRF/path traversal (GHSA-vv7q-7jx5-f767) (#3507) fix: prevent path traversal in skill download (#3493) fix: prefer IdP-granted scopes over client-requested scopes in OAuthProxy (#3492) fix: remove unrelated transform and http.py changes from PR scope fix: remove forced follow_redirects from httpx_client_factory calls (#3496) fix: stop passing follow_redirects to httpx_client_factory fix: restore follow_redirects=True for custom httpx client factories Closes #3509 fix: CSRF double-submit cookie check in consent flow (#3519) fix: validate server names in install commands (#3522) fix: use raw strings for regex in pytest.raises match (#3523) fix: reject refresh tokens used as Bearer access tokens (#3524) fix: route ResourcesAsTools/PromptsAsTools through server middleware (#3495) fix: resolve Pyright "Module is not callable" on @tool, @resource, @prompt decorators (#3540) fix: filter warnings by message in KEY_PREFIX test (#3549) fix: suppress output schema for ToolResult subclass annotations (#3548) fix: increase sleep duration in proxy cache tests (#3567) fix: store absolute token expiry to prevent stale expires_in on reload (#3572) fix: preserve tool properties named 'title' during schema compression (#3582) Fix loopback redirect URI port matching per RFC 8252 §7.3 (#3589) Fix app tool routing: visibility check and middleware propagation (#3591) Fix query parameter serialization to respect OpenAPI explode/style settings (#3595) Fix dev apps form: union types, textarea support, JSON parsing (#3597) fix(google): replace deprecated /oauth2/v1/tokeninfo with /oauth2/v3/userinfo (#3603) fix: resolve EntraOBOToken dependency injection through MultiAuth (#3609) fix(docs): correct misleading stateless_http header (#3622) fix: filesystem provider import machinery (#3626) Closes #3625 (issues 2, 3, 6) fix: recover StdioTransport after subprocess exits (#3630) fix(server): preserve mounted tool task metadata (#3632) fix: scope deprecation warning filter to FastMCPDeprecationWarning (#3649) fix imports, add PrefabAppConfig (#3650) fix: resolve CurrentFastMCP/ctx.fastmcp to child server in mounted background tasks (#3651) Fix blocking docs issues: chart imports, Select API, Rx consistency (#3652) closed by default (#3657) Fix prompt caching middleware missing wrap/unwrap round-trip (#3666) fix: serialize object query params per OpenAPI style/explode rules (#3662) Fixes #2857 fix: HTTP request headers not accessible in background task workers (#3631) fix: restore HTTP headers in worker execution path for background tasks (#3681) fix: strip discriminator after dereferencing schemas (#3682) fix: remove stale ty:ignore directives for ty 0.0.26 (#3684) Fix docs gaps in app provider pages (#3690) fix: dev apps log panel UX improvements (#3698) fix dev server empty string args (#3700)
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3.2 KiB
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90 lines
3.2 KiB
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---
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title: config
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sidebarTitle: config
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---
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# `fastmcp.apps.config`
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MCP Apps support — extension negotiation and typed UI metadata models.
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Provides constants and Pydantic models for the MCP Apps extension
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(io.modelcontextprotocol/ui), enabling tools and resources to carry
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UI metadata for clients that support interactive app rendering.
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## Functions
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### `app_config_to_meta_dict` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/apps/config.py#L173" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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app_config_to_meta_dict(app: AppConfig | dict[str, Any]) -> dict[str, Any]
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```
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Convert an AppConfig or dict to the wire-format dict for ``meta["ui"]``.
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## Classes
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### `ResourceCSP` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/apps/config.py#L20" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Content Security Policy for MCP App resources.
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Declares which external origins the app is allowed to connect to or
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load resources from. Hosts use these declarations to build the
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``Content-Security-Policy`` header for the sandboxed iframe.
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### `ResourcePermissions` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/apps/config.py#L52" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Iframe sandbox permissions for MCP App resources.
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Each field, when set (typically to ``{}``), requests that the host
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grant the corresponding Permission Policy feature to the sandboxed
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iframe. Hosts MAY honour these; apps should use JS feature detection
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as a fallback.
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### `AppConfig` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/apps/config.py#L79" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Configuration for MCP App tools and resources.
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Controls how a tool or resource participates in the MCP Apps extension.
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On tools, ``resource_uri`` and ``visibility`` specify which UI resource
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to render and where the tool appears. On resources, those fields must
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be left unset (the resource itself is the UI).
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All fields use ``exclude_none`` serialization so only explicitly-set
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values appear on the wire. Aliases match the MCP Apps wire format
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(camelCase).
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### `PrefabAppConfig` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/apps/config.py#L117" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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App configuration for Prefab tools with sensible defaults.
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Like ``app=True`` but customizable. Auto-wires the Prefab renderer
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URI and merges the renderer's CSP with any additional domains you
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specify. The renderer resource is registered automatically.
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Example::
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@mcp.tool(app=PrefabAppConfig()) # same as app=True
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@mcp.tool(app=PrefabAppConfig(
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csp=ResourceCSP(frame_domains=["https://example.com"]),
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))
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**Methods:**
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#### `model_post_init` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/apps/config.py#L133" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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model_post_init(self, __context: Any) -> None
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```
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