fastmcp/docs
Jeremiah Lowin 0ba3db1a56
Mirror the frontend's protocol era on a proxy's backend connection (#4573)
* Mirror front protocol era onto proxy backend connection

A proxy created from a non-Client target now negotiates, on its backend,
whatever era its front client negotiated, instead of pinning one era.
Explicit create_proxy(mode=...) still overrides. Guards the eager backend
initialize() so an explicit modern pin behind a handshake front no longer
crashes.

* Carry the mirrored proxy era into multi-server config backends

A multi-server MCPConfig target mounts one proxy per configured server on a
composite router, so setting the era on the outer client stopped at the router
and every real backend stayed on its default era. TransportOptions.backend_mode
carries it down, resolved per request alongside the outer mirroring.

The router is also sealed under a policy held on the transport rather than a
fresh per-router ephemeral key, so a guard tool's request_state survives the
router being rebuilt between rounds.
2026-07-20 12:31:02 -04:00
..
.cursor/rules Clean up parameter documentation 2025-06-22 20:59:53 -04:00
apps Align client, Apps, and integration docs (#4261) 2026-07-19 14:30:51 -04:00
assets Animated (#3231) 2026-02-19 11:56:51 -05:00
cli Align CLI, deployment, and config docs (#4259) 2026-07-19 14:24:07 -04:00
clients docs: quote pip extras install examples (#4568) 2026-07-20 11:09:50 -04:00
community Normalize repo references to PrefectHQ/fastmcp casing (#3218) 2026-02-18 14:51:18 -05:00
css Restore Mintlify's fixed banner positioning (#4542) 2026-07-18 21:25:39 -04:00
deployment Align CLI, deployment, and config docs (#4259) 2026-07-19 14:24:07 -04:00
development Mirror the frontend's protocol era on a proxy's backend connection (#4573) 2026-07-20 12:31:02 -04:00
getting-started Fix stale MRTR/elicitation framing in client and upgrade docs (#4551) 2026-07-19 18:10:15 -04:00
integrations Align client, Apps, and integration docs (#4261) 2026-07-19 14:30:51 -04:00
more Speed up the unit test suite, and fix the task-notification race it surfaced (#4550) 2026-07-19 18:52:04 -04:00
patterns Align CLI, deployment, and config docs (#4259) 2026-07-19 14:24:07 -04:00
public/schemas/fastmcp.json chore: Update fastmcp.json schema (#1955) 2025-09-29 20:12:24 -04:00
python-sdk chore: Update SDK documentation (#4442) 2026-07-19 15:06:18 -04:00
servers Mirror the frontend's protocol era on a proxy's backend connection (#4573) 2026-07-20 12:31:02 -04:00
snippets Fix docs app demo iframe assets (#4194) 2026-05-20 13:18:45 -04:00
tutorials Migrate to MCP SDK v2.0.0b2 (httpx2) (#4503) 2026-07-18 15:12:47 -04:00
v2 docs: quote pip extras install examples (#4568) 2026-07-20 11:09:50 -04:00
.ccignore Add comprehensive OAuth 2.1 authentication system with WorkOS integration (#1327) 2025-08-01 17:06:55 -04:00
changelog.mdx Fix typos (#4498) 2026-07-18 21:18:39 -04:00
docs.json Add server-side identity assertion (SEP-990 ID-JAG) (#4483) 2026-07-18 19:52:15 -04:00
fastmcp-analytics.js [codex] Add FastMCP docs telemetry (#3727) 2026-03-31 19:32:09 -04:00
prefab-demo-payloads.js Fix docs app demo iframe assets (#4194) 2026-05-20 13:18:45 -04:00
python-sdk-pages.json chore: Update SDK documentation (#4360) 2026-06-27 10:36:03 -04:00
unify-intent.js Add tag to deployment pages (#3624) 2026-03-25 11:39:25 -04:00
updates.mdx Docs: forward-port v3.4.4 changelog entries (#4476) 2026-07-08 20:55:43 -04:00
v2-banner.js Update docs for 3.0 GA release (#3216) 2026-02-18 14:29:28 -05:00
v2-navigation.json chore: split v2 docs navigation into separate file (#3762) 2026-04-04 21:17:39 -04:00