fastmcp/docs/getting-started/upgrading
Jeremiah Lowin 7339936980
Rewrite the v4 What's New page and document server extensions (#4698)
* Rewrite the v4 What's New page

Teach the headline features with code instead of asserting them, drop the
major-version throat-clearing and SEP list, and correct the elicitation
claim: ctx.elicit() is unchanged and handshake-only, while sampling and
roots are removed outright.

* Fix broken doc links and stale version references

Repoint five dead links and anchors, refresh v3-era version examples on the
v4 docs, and add the missing FastMCP 3 entry to the installation page's
upgrade section.

* Document server extensions

add_extension() shipped in v4 with no documentation page. Covers the
extension interface, request methods, tool-call interception, lifespan
ownership, and the client half.

* Link the FastMCP TypeScript library

* Address Codex review feedback

Gate the extension interceptor on the client's per-request opt-in rather
than claiming negotiation does it; show the v4 beta pin on the install
page instead of a version a reader cannot get; note that UserSession
requires authentication.
2026-07-28 20:05:45 -04:00
..
from-fastmcp-2.mdx Rewrite the v4 What's New page and document server extensions (#4698) 2026-07-28 20:05:45 -04:00
from-fastmcp-3.mdx Add v4.0.0b1 changelog and updates entries (#4681) 2026-07-28 17:15:48 -04:00
from-low-level-sdk-v1.mdx Move to the stable MCP Python SDK 2.0.0 (#4655) 2026-07-28 16:31:49 -04:00
from-low-level-sdk-v2.mdx Split the SDK upgrade guides by SDK version (#4684) 2026-07-28 10:47:39 -04:00
from-mcp-sdk-v1.mdx Move to the stable MCP Python SDK 2.0.0 (#4655) 2026-07-28 16:31:49 -04:00
from-mcp-sdk-v2.mdx Move to the stable MCP Python SDK 2.0.0 (#4655) 2026-07-28 16:31:49 -04:00