Bump fastmcp from 3.1.0 to 3.2.0 in /client/hello by dependabot[bot] · Pull Request #16 · alphasecio/mcp-client-server

dependabot · 2026-03-31T22:39:07Z

Bumps fastmcp from 3.1.0 to 3.2.0.

Release notes

v3.2.0: Show Don't Tool

FastMCP 3.2 is the Apps release. The 3.0 architecture gave you providers and transforms; 3.1 shipped Code Mode for tool discovery. 3.2 puts a face on it: your tools can now return interactive UIs — charts, dashboards, forms, maps — rendered right inside the conversation.

FastMCPApp

FastMCPApp is a new provider class for building interactive applications inside MCP. It separates the tools the LLM sees (@app.ui()) from the backend tools the UI calls (@app.tool()), manages visibility automatically, and gives tool references stable identifiers that survive namespace transforms and server composition — without requiring host cooperation.
from fastmcp import FastMCP, FastMCPApp
from prefab_ui.actions.mcp import CallTool
from prefab_ui.components import Column, Form, Input, Button, ForEach, Text
app = FastMCPApp("Contacts")
@app.tool()
def save_contact(name: str, email: str) -> list[dict]:
db.append({"name": name, "email": email})
return list(db)
@app.ui()
def contact_manager() -> PrefabApp:
with PrefabApp(state={"contacts": list(db)}) as view:
with Column(gap=4):
ForEach("contacts", lambda c: Text(c.name))
with Form(on_submit=CallTool("save_contact")):
Input(name="name", required=True)
Input(name="email", required=True)
Button("Save")
return view
mcp = FastMCP("Server", providers=[app])
The UI is built with Prefab, a Python component library that compiles to interactive UIs. You write Python; the user sees charts, tables, forms, and dashboards. FastMCP handles the MCP Apps protocol machinery — renderer resources, CSP configuration, structured content serialization — so you don't have to.

For simpler cases where you just want to visualize data without server interaction, set app=True on any tool and return Prefab components directly:
@mcp.tool(app=True)
def revenue_chart(year: int) -> PrefabApp:
    with PrefabApp() as app:
        BarChart(data=revenue_data, series=[ChartSeries(data_key="revenue")])
    return app
Built-in Providers

Five ready-made providers you add with a single add_provider() call:

FileUpload — drag-and-drop file upload with session-scoped storage

... (truncated)

Commits

665514e Add forward_resource flag to OAuthProxy (#3711)
f189d1f Bump pydantic-monty to 0.0.9 (#3707)
6faa2d6 Remove hardcoded prefab-ui version from pinning warnings (#3708)
dd8816c chore: Update SDK documentation (#3701)
d274959 docs: note that custom routes are unauthenticated (#3706)
4a54be2 Add examples gallery page (#3705)
961dd50 Add interactive map example with geocoding (#3702)
f01d0c5 Add quiz example app, fix dev server empty string args (#3700)
85b7efd chore: Update SDK documentation (#3694)
27abe3c Add sales dashboard and live system monitor examples, bump prefab-ui to 0.17 ...
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Bumps [fastmcp](https://github.com/PrefectHQ/fastmcp) from 3.1.0 to 3.2.0. - [Release notes](https://github.com/PrefectHQ/fastmcp/releases) - [Changelog](https://github.com/PrefectHQ/fastmcp/blob/main/docs/changelog.mdx) - [Commits](PrefectHQ/fastmcp@v3.1.0...v3.2.0) --- updated-dependencies: - dependency-name: fastmcp dependency-version: 3.2.0 dependency-type: direct:production ... Signed-off-by: dependabot[bot] <support@github.com>

socket-security · 2026-03-31T22:40:27Z

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	fastmcp@3.2.0

View full report

socket-security · 2026-03-31T22:40:29Z

Caution

Review the following alerts detected in dependencies.

According to your organization's Security Policy, you must resolve all "Block" alerts before proceeding. Learn more about Socket for GitHub.

Action	Severity	Alert (click "▶" to expand/collapse)
Block		Potential code anomaly (AI signal): pypi `fastmcp` is 62.0% likely to have a medium risk anomaly Notes: No definitive malicious payload is visible in this fragment (no network exfiltration or hardcoded credentials), but it contains two high-impact risk primitives: (1) dynamic loading/import of a server from a filesystem-controlled source/path via config.source.load_server(), and (2) opening a caller-supplied deep link via OS handlers with only scheme validation. These behaviors increase the security risk if server_spec/url/env_file originate from untrusted sources. The snippet appears truncated/corrupted at `return Fals`, limiting confidence in full control-flow correctness. Confidence: 0.62 Severity: 0.61 From: client/hello/requirements.txt → `pypi/fastmcp@3.2.0` ℹ Read more on: This package \| This alert \| What is an AI-detected potential code anomaly? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at `support@socket.dev`. Suggestion: An AI system found a low-risk anomaly in this package. It may still be fine to use, but you should check that it is safe before proceeding. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment `@SocketSecurity ignore pypi/fastmcp@3.2.0`. You can also ignore all packages with `@SocketSecurity ignore-all`. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.
Block		Embedded URLs or IPs: pypi `fastmcp` URLs: https://gofastmcp.com/apps/patterns, https://nominatim.openstreetmap.org/search, https://github.com/modelcontextprotocol/ext-apps/tree/main/examples/qr-server, https://gofastmcp.com, https://unpkg.com, https://github.com/PrefectHQ/fastmcp, https://picsum.photos/400/300, https://picsum.photos/300/200, https://bsky.social, https://your-app.authkit.app, http://127.0.0.1:8000/mcp, http://127.0.0.1:8000/api/mcp/github/mcp, http://127.0.0.1:8000/api/mcp/google/mcp, https://your-env.scalekit.com, https://mozilla.github.io/pdf.js/web/compressed.tracemonkey-pldi-09.pdf, https://surgemsg.com/, https://api.surgemsg.com/messages, https://api.github.com/repos/, https://prefab.prefect.io, https://registry.npmjs.org/@modelcontextprotocol/ext-apps/-/ext-apps-, https://esm.sh/@modelcontextprotocol/sdk@, https://esm.sh, https://esm.sh/zod@, https://example.com, https://myapp.example.com/oauth/client.json, https://YOUR-DOMAIN.com/path/to/client.json, https://valkey.io/, https://gofastmcp.com/docs/tasks, https://block.github.io/goose/docs/getting-started/using-extensions/#config-entry, https://gofastmcp.com/clients/auth/oauth#token-storage, https://fastmcp-test-server.example.com, https://dev.example.com, https://gofastmcp.com/servers/tools#custom-serialization, https://gofastmcp.com/servers/prompts#using-with-methods, http://oauth.net/core/2.1/#registration, https://login.example.com/, https://example.com/.well-known/jwks.json, https://gofastmcp.com/deployment/http#mounting-authenticated-servers, http://example.com/api, https://modelcontextprotocol.io/specification/2025-06-18/basic/security_best_practices#confused-deputy-problem, https://gofastmcp.com/servers/auth/oauth-proxy#confused-deputy-attacks, https://graph.microsoft.com/User.Read, https://login.microsoftonline.com/your-tenant-id/v2.0, https://my-server.com, https://discord.com/api/oauth2/@me, https://discord.com/oauth2/authorize, https://discord.com/api/oauth2/token, 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https://example.com:8080/mcp, https://github.com/modelcontextprotocol/python-sdk/pull/659, https://x.com, http://other-host.example.com/target, http://origin-host.example.com/redirect, http://same-host.example.com/target, http://same-host.example.com/redirect, http://evil.example.com/steal, http://legit.example.com/api, https://example.com/sse, https://some.fake.url/, https://github.com/modelcontextprotocol/conformance, https://json-schema.org/draft/2020-12/schema, https://github.com/settings/developers, http://127.0.0.1:9100/auth/callback, https://api.githubcopilot.com/mcp/, http://example.com/data, https://auth.example.com/authorize, https://auth.example.com/token, https://api.example.com/, https://auth.example.com/revoke, https://issuer.example.com, https://docs.example.com, https://auth.com/authorize, https://auth.com/token, https://api.com, https://cognito-idp.us-east-1.amazonaws.com/us-east-1_XXXXXXXXX, https://test.auth.us-east-1.amazoncognito.com/oauth2/authorize, https://test.auth.us-east-1.amazoncognito.com/oauth2/token, https://cognito-idp.us-east-1.amazonaws.com/us-east-1_XXXXXXXXX/.well-known/jwks.json, https://test.auth.us-east-1.amazoncognito.com/oauth2/userInfo, https://github.com/testuser.png, https://example.com/mcp?foo=bar, https://example.com/mcp?a=1&b=2, https://example.com/mcp#section, https://example.com/mcp?foo=bar#section, https://example.com/mcp/, https://example.com/mcp/?foo=bar, https://example.com/api/v2/mcp?kb_name=test, https://example.com/api/v2/mcp, https://example.com:8080/mcp?foo=bar, https://example.com/?foo=bar, https://example.com/mcp?, https://example.com/mcp#fragment, https://oauth.example.com/authorize, https://oauth.example.com/token, https://proxy.example.com, https://malicious-server.com/mcp, https://proxy.example.com/api/v2/mcp, https://proxy.example.com/mcp, https://proxy.example.com/api/v2/mcp?kb_name=test, https://proxy.example.com/wrong/path?kb_name=test, https://proxy.example.com/mcp?tenant=acme, https://proxy.example.com/mcp?tenant=other, https://proxy.example.com/custom/mcp, https://proxy.example.com/, https://proxy.example.com/api/mcp, https://myserver.com, https://idp.example.com/authorize, https://idp.example.com/token, https://idp.example.com/.well-known/jwks.json, https://idp.example.com, https://api.descope.com/v1/apps/agentic/P2abc123/M123/.well-known/openid-configuration, https://myserver.com/, https://api.descope.com/v1/apps/agentic/P2env123/M123/.well-known/openid-configuration, http://env-server.com, http://env-server.com/, https://api.descope.com/v1/apps/agentic/P2abc123/M123, https://api.descope.com/v1/apps/P2abc123, https://api.descope.com/P2abc123/.well-known/jwks.json, https://api.descope.com/v1/apps/agentic/P2new123/M123/.well-known/openid-configuration, https://old.descope.com, https://api.descope.com/v1/apps/agentic/P2new123/M123, https://envserver.com, https://api.descope.com/v1/apps/agentic/P2test123/M123/.well-known/openid-configuration, https://graph.microsoft.com/Mail.Send, https://login.microsoftonline.com/my-tenant-id/discovery/v2.0/keys, https://login.microsoftonline.com/my-tenant-id/v2.0, https://login.microsoftonline.us/my-tenant-id/discovery/v2.0/keys, https://login.microsoftonline.us/my-tenant-id/v2.0, https://login.microsoftonline.com/12345678-1234-1234-1234-123456789012/v2.0, https://login.microsoftonline.com, https://login.microsoftonline.us, https://login.microsoftonline.com/my-tenant-id/oauth2/v2.0/authorize, https://login.microsoftonline.com/my-tenant-id/oauth2/v2.0/token, https://login.microsoftonline.com/my-tenant/discovery/v2.0/keys, https://login.microsoftonline.com/my-tenant/v2.0, https://should.be.ignored, https://login.microsoftonline.com/test-tenant/oauth2/v2.0/authorize, https://login.microsoftonline.com/test-tenant/oauth2/v2.0/token, https://login.microsoftonline.com/test-tenant/v2.0, https://login.microsoftonline.com/test-tenant/discovery/v2.0/keys, https://login.microsoftonline.us/gov-tenant-id/oauth2/v2.0/authorize, https://login.microsoftonline.us/gov-tenant-id/oauth2/v2.0/token, https://login.microsoftonline.us/gov-tenant-id/v2.0, https://login.microsoftonline.us/gov-tenant-id/discovery/v2.0/keys, https://login.microsoftonline.us/env-tenant-id/oauth2/v2.0/authorize, https://login.microsoftonline.us/env-tenant-id/oauth2/v2.0/token, https://login.microsoftonline.us/env-tenant-id/v2.0, https://login.microsoftonline.us/env-tenant-id/discovery/v2.0/keys, https://graph.microsoft.com/.default, https://myserver.com/mcp, https://img.clerk.com/photo.jpg, https://example.com/callback, https://example.com/.well-known/openid-configuration, https://example.com:8000/, https://example.com/authorize, https://example.com/oauth/token, https://test.authkit.app, https://test.authkit.app/oauth2/authorize, https://test.authkit.app/oauth2/token, https://respectful-lullaby-34-staging.authkit.app, https://test.authkit.app/oauth2/userinfo, https://auth.example.com/introspect, https://auth.example.com/.well-known/jwks.json, https://auth.example.com, https://test.example.com, https://test.example.com/.well-known/jwks.json, https://evil.example.com, https://wrong-api.example.com, https://attacker.com, https://wrong-endpoint.com/token, https://different-client.com, https://app.example.com/, https://evil.com/callback, https://auth.example.com/oauth/2.1, https://auth.example.com/oauth/2.1/introspect, https://auth.example.com/, https://auth.propelauth.com, https://auth.propelauth.com/oauth/2.1, https://anything.example.com, https://auth.example.com/oauth/2.1/token, https://auth.example.com/oauth/2.1/authorize, https://auth.example.com/.well-known/oauth-authorization-server/oauth/2.1, https://my-env.scalekit.com, https://legacy.scalekit.com, https://legacy-app.com/, https://preferred-base.com/, https://unused-base.com/, https://test-env.scalekit.com, http://test-server.com, http://test-server.com/, https://my-env.scalekit.com/, https://my-env.scalekit.com/keys, https://my-env.scalekit.com/resources/sk_resource_456, https://test-env.scalekit.com/token, https://test-env.scalekit.com/authorize, https://test-env.scalekit.com/.well-known/oauth-authorization-server/resources/sk_resource_test_456, https://example.com/path/to/client, https://sub.example.com/cimd.json, http://example.com/client.json, http://127.0.0.1/callback, http://127.0.0.1:3000/callback, https://other.com/client.json, https://test.com, https://myserver.com/register, https://example.com/icon.png, https://my-server.com/.well-known/oauth-protected-resource/api/v1/mcp, https://my-server.com/mcp, https://my-server.com/api/v2/services/mcp, https://env123.supabase.co, https://abc123.supabase.co/, https://abc123.supabase.co/auth/v1/.well-known/jwks.json, https://abc123.supabase.co/auth/v1, https://abc123.supabase.co/custom/auth/route/.well-known/jwks.json, https://test123.supabase.co, https://www.googleapis.com/auth/calendar, https://example.com/photo.jpg, https://test-server.com, https://test-server.com/mcp, https://other-server.com, https://other-server.com/mcp, https://any.example.com, https://any-api.example.com, https://other-api.example.com, https://third-party.example.com, https://other-issuer.example.com, https://wrong-issuer.example.com, https://my-auth-server.com, https://example.com/custom-icon.png, https://override.example.com, https://override.example.com/, https://api.example.com/api, https://api.example.com/api/mcp, https://api.example.com/outer/inner, https://api.example.com/outer/inner/mcp, https://upstream.example.com/authorize, https://upstream.example.com/token, https://api.example.com/api/authorize, https://api.example.com/api/token, https://api.example.com/api/register, https://api.example.com/api/, http://127.0.0.1:3000, https://claude.ai/api/mcp/auth_callback, https://app.example.com/callback, https://app.example.com/oauth/callback, https://anywhere.com:9999/path, 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http://127.0.0.1:8080, https://app.example.com, https://api.trusted.io/auth, https://other.example.com/callback, http://example.com/callback, https://app.example.com@attacker.com/callback, http://127.0.0.1:51353/callback, http://example.com:80/callback, https://resource.example.com, https://resource.example.com/, https://github.com/PrefectHQ/fastmcp/issues/3457, https://github.com/PrefectHQ/fastmcp/issues/2583, https://github.com/PrefectHQ/fastmcp/issues/1300, https://github.com/PrefectHQ/fastmcp/issues/3228, http://127.0.0.1:9999/sse/, https://example.com/greet-icon.png, https://example.com/wave-icon.png, https://example.com/user-icon.png, https://example.com/welcome-icon.png, http://example.com/mcp/, https://raw.githubusercontent.com/github/rest-api-description/refs/heads/main/descriptions-next/ghes-3.17/ghes-3.17.json, https://github.com/PrefectHQ/fastmcp/issues/2679, https://example.com/tool-icon.png, https://example.com/resource-icon.png, https://example.com/template-icon.png, https://example.com/prompt-icon.png, https://example.com/icon-48.png, https://example.com/icon-96.png, https://example.com/icon.svg, https://mcptest.com, https://client.example.com/callback, https://auth.example.com/register, https://docs.example.com/, https://client.example.com/other-callback, https://client.example.com, https://api.example.com/v1/users, https://attacker.example.com/callback, https://github.com/PrefectHQ/fastmcp/issues/1369, https://github.com/PrefectHQ/fastmcp/issues/3130, https://github.com/PrefectHQ/fastmcp/issues/3421, https://cdn.example.com, https://embed.example.com, https://base.example.com, https://worker.example.com, https://github.com/PrefectHQ/fastmcp/issues/2802, https://github.com/PrefectHQ/fastmcp/issues/2790, https://api.example.com/users/123, https://api.example.com/v1/users/123, https://api.example.com/users/42, https://api.example.com/search, https://api.example.com/api/v1/users/, https://api.example.com/api/v1/users/user-123/profile, https://api.example.com/api/v1/users/42/profile, https://example.com/calculator.png, https://example.com/data.png, https://example.com/user.png, https://example.com/analyze.png, https://example.com/tool-small.png, https://example.com/tool-large.png, https://example.com/v1-tool.png, https://example.com/server.png, https://example.com/tool.png, https://github.com/PrefectHQ/fastmcp/issues/3008, https://example.com/schema.json#/definitions/Node, http://evil.com/schema.json, https://evil.com/schema.json, http://169.254.169.254/latest/meta-data/, http://169.254.169.254/latest/meta-data/iam/security-credentials/, https://evil.com/inject Location: Package overview From: client/hello/requirements.txt → `pypi/fastmcp@3.2.0` ℹ Read more on: This package \| This alert \| What are URL strings? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at `support@socket.dev`. Suggestion: Review all remote URLs to ensure they are intentional, pointing to trusted sources, and not being used for data exfiltration or loading untrusted code at runtime. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment `@SocketSecurity ignore pypi/fastmcp@3.2.0`. You can also ignore all packages with `@SocketSecurity ignore-all`. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.
Block		Embedded URLs or IPs: pypi `fastmcp` URLs: https://example.com, https://prefab.prefect.io, https://registry.npmjs.org/@modelcontextprotocol/ext-apps/-/ext-apps-, https://esm.sh/@modelcontextprotocol/sdk@, https://esm.sh, https://esm.sh/zod@, https://myapp.example.com/oauth/client.json, https://YOUR-DOMAIN.com/path/to/client.json, https://block.github.io/goose/docs/getting-started/using-extensions/#config-entry, https://valkey.io/, https://gofastmcp.com/docs/tasks, https://gofastmcp.com/clients/auth/oauth#token-storage, https://fastmcp-test-server.example.com, https://dev.example.com, https://gofastmcp.com/servers/tools#custom-serialization, https://gofastmcp.com/servers/prompts#using-with-methods, https://login.example.com/, https://example.com/.well-known/jwks.json, https://gofastmcp.com/deployment/http#mounting-authenticated-servers, http://example.com/api, http://oauth.net/core/2.1/#registration, https://graph.microsoft.com/User.Read, https://login.microsoftonline.com/your-tenant-id/v2.0, https://my-server.com, https://modelcontextprotocol.io/specification/2025-06-18/basic/security_best_practices#confused-deputy-problem, https://gofastmcp.com/servers/auth/oauth-proxy#confused-deputy-attacks, https://auth0.config.url, https://app.descope.com/mcp-servers, https://docs.descope.com/identity-federation/inbound-apps/creating-inbound-apps#method-2-dynamic-client-registration-dcr, https://your-fastmcp-server.com, https://api.descope.com, https://discord.com/api/oauth2/@me, https://discord.com/oauth2/authorize, https://discord.com/api/oauth2/token, https://api.github.com/user, https://api.github.com/user/repos, https://github.com/login/oauth/authorize, https://github.com/login/oauth/access_token, https://openid.net/specs/openid-connect-discovery-1_0.html, https://datatracker.ietf.org/doc/html/rfc8414, https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderMetadata, https://datatracker.ietf.org/doc/html/rfc8414#section-2, https://oidc.config.url, https://your.server.url, https://fastmcp.example.com, https://auth.yourdomain.com, https://docs.propelauth.com/mcp-authentication/overview, https://api.example.com/mcp, https://abc123.supabase.co, http://fastmcp.example.com, https://your-app.authkit.app, https://your-fastmcp-server.com/oauth2/callback, https://workos.com/docs/authkit/mcp/integrating/token-verification, https://your-workos-domain.authkit.app, https://app.scalekit.com/, https://your-env.scalekit.com, https://docs.scalekit.com/mcp/overview/, https://auth.example.com/oauth/introspect, https://www.googleapis.com/auth/userinfo.email, https://www.googleapis.com/auth/userinfo.profile, https://oauth2.googleapis.com/tokeninfo?access_token=TOKEN, https://oauth2.googleapis.com/tokeninfo, https://www.googleapis.com/oauth2/v2/userinfo, https://accounts.google.com/o/oauth2/v2/auth, https://oauth2.googleapis.com/token, https://gofastmcp.com/deployment/asgi, http://127.0.0.1, https://app.example.com/auth/, https://api.example.com, https://gofastmcp.com/servers/tools#using-with-methods, https://gofastmcp.com/servers/resources#using-with-methods, https://github.com/PrefectHQ/fastmcp/issues, https://gofastmcp.com/servers/dependency-injection#using-depends, https://gofastmcp.com/servers/tasks, https://horizon.prefect.io, https://gofastmcp.com, https://astral.sh/uv/install.sh, https://gofastmcp.com/public/schemas/fastmcp.json/v1.json, https://pypi.org/pypi/fastmcp/json, https://gofastmcp.com/assets/brand/blue-logo.png Location: Package overview From: client/hello/requirements.txt → `pypi/fastmcp@3.2.0` ℹ Read more on: This package \| This alert \| What are URL strings? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at `support@socket.dev`. Suggestion: Review all remote URLs to ensure they are intentional, pointing to trusted sources, and not being used for data exfiltration or loading untrusted code at runtime. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment `@SocketSecurity ignore pypi/fastmcp@3.2.0`. You can also ignore all packages with `@SocketSecurity ignore-all`. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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dependabot Bot added dependencies Pull requests that update a dependency file python Pull requests that update python code labels Mar 31, 2026

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Bump fastmcp from 3.1.0 to 3.2.0 in /client/hello#16

Bump fastmcp from 3.1.0 to 3.2.0 in /client/hello#16
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dependabot Bot commented on behalf of github Mar 31, 2026

v3.2.0: Show Don't Tool

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