Skip to content

chore(deps): bump fastmcp from 2.12.4 to 3.2.0 - #849

Merged
marandaneto merged 1 commit into
mainfrom
dependabot/uv/fastmcp-3.2.0
Aug 7, 2026
Merged

chore(deps): bump fastmcp from 2.12.4 to 3.2.0#849
marandaneto merged 1 commit into
mainfrom
dependabot/uv/fastmcp-3.2.0

Conversation

@dependabot

@dependabot dependabot Bot commented on behalf of github Aug 7, 2026

Copy link
Copy Markdown
Contributor

Bumps fastmcp from 2.12.4 to 3.2.0.

Release notes

Sourced from fastmcp's releases.

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)

Changelog

Sourced from fastmcp's changelog.

title: "Changelog" icon: "list-check" rss: true tag: NEW

v3.4.6: Trust, but Proxy

FastMCP 3.4.6 backports trusted-proxy support for SSRF-protected OAuth metadata and JWKS fetches. Deployments can now route these requests through a mandated corporate proxy while preserving custom CA certificates; FastMCP refuses the fetch when no proxy is configured instead of risking an unprotected direct request.

Fixes 🐞

Docs 📚

Full Changelog: v3.4.5...v3.4.6

v4.0.0b1: Fourgone Conclusion

FastMCP 4 makes stateful MCP applications work on the sessionless 2026-07-28 protocol while one deployment continues serving handshake-era clients. Tools can ask follow-up questions across requests, preserve authenticated user state, and move long-running work into background tasks without sticky sessions. Protocol extensions and enterprise identity become first-class surfaces, and most FastMCP 3 servers upgrade unchanged even though MCP Python SDK v2 rewrote the engine underneath them. Server-initiated sampling and roots are removed from the server API; the upgrade guide covers their replacements.

New Features 🎉

  • Migrate to MCP Python SDK v2 by @​jlowin in #4437
  • Teach fastmcp.Client the modern protocol: mode negotiation, MRTR driver, response cache by @​jlowin in #4450
  • Forward-port Hugging Face auth provider by @​jlowin in #4475
  • Add server-side identity assertion (SEP-990 ID-JAG) by @​jlowin in #4483
  • Add guard-mode multi-round-trip tools (SEP-2322) by @​jlowin in #4544
  • Add FastMCP-native server extension API (SEP-2133) by @​jlowin in #4602
  • Add stateless session state (UserSession / SessionId) by @​jlowin in #4604
  • Add background tasks via the io.modelcontextprotocol/tasks extension (SEP-2663) by @​jlowin in #4603

Breaking Changes ⚠️

... (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 ...
  • Additional commits viewable in compare view

Dependabot compatibility score

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

  • @dependabot rebase will rebase this PR
  • @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
  • @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
  • @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
  • @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
  • @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
    You can disable automated security fix PRs for this repo from the Security Alerts page.

@dependabot
chore(deps): bump fastmcp from 2.12.4 to 3.2.0
9881de9 
Bumps [fastmcp](https://github.com/PrefectHQ/fastmcp) from 2.12.4 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@v2.12.4...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>
@dependabot dependabot Bot added dependencies Pull requests that update a dependency file python:uv Pull requests that update python:uv code labels Aug 7, 2026
@dependabot
dependabot Bot requested a review from a team as a code owner August 7, 2026 09:51
@dependabot dependabot Bot added dependencies Pull requests that update a dependency file python:uv Pull requests that update python:uv code labels Aug 7, 2026
@github-actions

github-actions Bot commented Aug 7, 2026 •
edited
Loading

Copy link
Copy Markdown
Contributor

posthog-python Compliance Report

Date: 2026-08-07 09:56:17 UTC
Duration: 256453ms

✅ All Tests Passed!

111/111 tests passed

Capture_V1 Tests

✅ 94/94 tests passed

View Details
Test Status Duration
Endpoint And Method.Targets V1 Endpoint ✅ 518ms
Endpoint And Method.Does Not Use Legacy Endpoints ✅ 511ms
Required Headers.Has Authorization Bearer Header ✅ 511ms
Required Headers.Has Content Type Json ✅ 511ms
Required Headers.Has Posthog Sdk Info Format ✅ 511ms
Required Headers.Has Posthog Attempt Header ✅ 511ms
Required Headers.Has Posthog Request Id ✅ 511ms
Required Headers.Has Posthog Request Timestamp ✅ 510ms
Required Headers.Has User Agent ✅ 511ms
Body Format.Body Has Created At And Batch ✅ 510ms
Body Format.No Api Key In Body ✅ 511ms
Body Format.No Sent At In Body ✅ 510ms
Event Format.Event Has Required Root Fields ✅ 510ms
Event Format.Event Uuid Is Valid ✅ 511ms
Event Format.Event Timestamp Is Rfc3339 ✅ 510ms
Event Format.Distinct Id Is String ✅ 510ms
Event Format.Distinct Id At Root Not Properties ✅ 511ms
Event Format.Custom Properties Preserved ✅ 510ms
Event Format.Set Properties Preserved ✅ 511ms
Event Format.Set Once Properties Preserved ✅ 510ms
Event Format.Groups Properties Preserved ✅ 512ms
Event Format.Sdk Generates Uuid If Not Provided ✅ 510ms
Event Format.Event Has Required Root Fields Batch ✅ 514ms
Event Format.Event Uuid Is Valid Batch ✅ 514ms
Event Format.Event Timestamp Is Rfc3339 Batch ✅ 514ms
Event Format.Distinct Id Is String Batch ✅ 514ms
Event Format.Distinct Id At Root Not Properties Batch ✅ 514ms
Event Format.Custom Properties Preserved Batch ✅ 515ms
Event Format.Set Properties Preserved Batch ✅ 514ms
Event Format.Set Once Properties Preserved Batch ✅ 514ms
Event Format.Groups Properties Preserved Batch ✅ 514ms
Event Format.Sdk Generates Uuid If Not Provided Batch ✅ 514ms
Batch Behavior.Multiple Events In Single Batch ✅ 518ms
Batch Behavior.Batch Envelope Smoke ✅ 516ms
Batch Behavior.Flush With No Events Sends Nothing ✅ 506ms
Batch Behavior.Flush At Triggers Batch ✅ 1012ms
Batch Behavior.Created At Reflects Batch Creation Time ✅ 510ms
Deduplication.Generates Unique Uuids ✅ 518ms
Deduplication.Different Events Same Content Different Uuids ✅ 513ms
Deduplication.Preserves Uuid On Retry ✅ 6515ms
Deduplication.Preserves Timestamp On Retry ✅ 6516ms
Deduplication.Preserves Uuid And Timestamp On Batch Retry ✅ 6519ms
Deduplication.No Duplicate Events In Batch ✅ 518ms
Header Behavior On Retry.Attempt Header Starts At One ✅ 511ms
Header Behavior On Retry.Attempt Header Increments On Retry ✅ 13521ms
Header Behavior On Retry.Request Id Preserved On Retry ✅ 6519ms
Header Behavior On Retry.Different Requests Have Different Request Ids ✅ 3020ms
Header Behavior On Retry.Request Timestamp Changes On Retry ✅ 6521ms
Response Format Validation.Success Response Has Uuid Keyed Results ✅ 511ms
Response Format Validation.Success Response Has Ok For Each Event ✅ 514ms
Response Format Validation.Success No Retry After When All Ok ✅ 513ms
Response Format Validation.Success Retry After Present When Retry Events ✅ 1516ms
Response Format Validation.Success No Retry After When Drop Only ✅ 513ms
Response Format Validation.Response Echoes Request Id ✅ 511ms
Retry Behavior.Retries On 408 ✅ 6515ms
Retry Behavior.Retries On 500 ✅ 6520ms
Retry Behavior.Retries On 503 ✅ 8522ms
Retry Behavior.Retries On 504 ✅ 6517ms
Retry Behavior.Retryable Errors Have Retry After ✅ 3516ms
Retry Behavior.Respects Retry After On Retryable Error ✅ 11522ms
Retry Behavior.Does Not Retry On 400 ✅ 2515ms
Retry Behavior.Does Not Retry On 401 ✅ 2513ms
Retry Behavior.Does Not Retry On 402 ✅ 2512ms
Retry Behavior.Does Not Retry On 413 ✅ 2513ms
Retry Behavior.Does Not Retry On 415 ✅ 2513ms
Retry Behavior.Non Retryable Errors Have No Retry After ✅ 2514ms
Retry Behavior.Implements Backoff ✅ 22526ms
Retry Behavior.Max Retries Respected ✅ 22537ms
Partial Batch Handling.Handles 200 Full Success ✅ 2513ms
Partial Batch Handling.Handles 200 With All Ok ✅ 3517ms
Partial Batch Handling.Does Not Retry Dropped Events ✅ 3517ms
Partial Batch Handling.Does Not Retry Limited Events ✅ 3516ms
Partial Batch Handling.Prunes Ok Events On Partial Retry ✅ 6523ms
Partial Batch Handling.Prunes Dropped Events On Partial Retry ✅ 6522ms
Partial Batch Handling.Retries Only Retry Events From Partial ✅ 6524ms
Partial Batch Handling.Partial Retry Preserves Uuids ✅ 6523ms
Partial Batch Handling.Partial Retry Attempt Header Increments ✅ 6523ms
Partial Batch Handling.Partial Retry Request Id Preserved ✅ 6522ms
Partial Batch Handling.Respects Retry After On Partial ✅ 8520ms
Partial Batch Handling.Unknown Result Treated As Terminal ✅ 3514ms
Partial Batch Handling.Mixed Ok Drop Limited No Retry ✅ 3522ms
Compression.Sends Gzip Content Encoding ✅ 511ms
Compression.No Content Encoding When Disabled ✅ 511ms
Compression.Compressed Body Is Decompressible ✅ 511ms
Error Handling.Does Not Retry On Unknown 4Xx ✅ 2512ms
Event Options.Cookieless Mode Override ✅ 511ms
Event Options.Disable Skew Correction Override ✅ 511ms
Event Options.Process Person Profile Override ✅ 511ms
Event Options.Product Tour Id Override ✅ 511ms
Event Options.Unset Options Omitted ✅ 510ms
Event Options.Options Override In Batch ✅ 515ms
Geoip And Historical Migration.Geoip Disable Injected Into Properties ✅ 511ms
Geoip And Historical Migration.Historical Migration Set In Body ✅ 510ms
Geoip And Historical Migration.Historical Migration Absent By Default ✅ 511ms

Feature_Flags Tests

✅ 17/17 tests passed

View Details
Test Status Duration
Request Payload.Request With Person Properties Device Id ✅ 12ms
Request Payload.Flags Request Uses V2 Query Param ✅ 10ms
Request Payload.Flags Request Hits Flags Path Not Decide ✅ 11ms
Request Payload.Flags Request Omits Authorization Header ✅ 10ms
Request Payload.Token In Flags Body Matches Init ✅ 10ms
Request Payload.Groups Round Trip ✅ 9ms
Request Payload.Groups Default To Empty Object ✅ 10ms
Request Payload.Disable Geoip False Propagates As Geoip Disable False ✅ 10ms
Request Payload.Disable Geoip Omitted Defaults To False ✅ 9ms
Request Payload.Flag Keys To Evaluate Contains Only Requested Key ✅ 11ms
Request Lifecycle.No Flags Request On Init Alone ✅ 3ms
Request Lifecycle.No Flags Request On Normal Capture ✅ 510ms
Request Lifecycle.Two Flag Calls Produce Two Remote Requests ✅ 14ms
Request Lifecycle.Mock Response Value Is Returned To Caller ✅ 9ms
Retry Behavior.Retries Flags On 502 ✅ 313ms
Retry Behavior.Retries Flags On 504 ✅ 314ms
Side Effect Events.Get Feature Flag Captures Feature Flag Called Event ✅ 513ms

@marandaneto
marandaneto merged commit 8446593 into main Aug 7, 2026
38 checks passed
@marandaneto
marandaneto deleted the dependabot/uv/fastmcp-3.2.0 branch August 7, 2026 11:10
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Reviewers

@marandaneto marandaneto marandaneto approved these changes

Assignees

No one assigned

Labels

dependencies Pull requests that update a dependency file python:uv Pull requests that update python:uv code

Projects

None yet

Milestone

No milestone

Development

Successfully merging this pull request may close these issues.

1 participant

@marandaneto