modelcontextprotocol/python-sdk
Watch
1
0
Fork
You've already forked python-sdk
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Mirror x-mcp-header tool arguments into Mcp-Param-* request headers (SEP-2243) (#2990)

Browse source
This commit is contained in:
Marcelo Trylesinski 2026-06-26 14:36:56 +02:00 • committed by GitHub
commit 5b2713d40c
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
1 changed files with 393 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

13
tests/interaction/_requirements.py
View file

@ -3372,6 +3372,19 @@ REQUIREMENTS: dict[str, Requirement] = {
transports=("streamable-http",),
note="Only observable over streamable HTTP: headers are derived from the body envelope at the transport seam.",
),
"client-transport:http:custom-param-headers": Requirement(
source=f"{SPEC_2026_BASE_URL}/basic/transports/streamable-http#custom-headers-from-tool-parameters",
behavior=(
"On a tools/call, a client mirrors each argument annotated with x-mcp-header in the tool's "
"inputSchema into an Mcp-Param-<name> header -- string as-is, integer as decimal, boolean as "
"true/false, base64-sentinel-wrapped when not header-safe -- omitting null or absent arguments and "
"never mirroring unannotated parameters. The schema is taken from the tool's last list_tools entry; "
"a tool the client never listed emits no Mcp-Param-* headers."
),
added_in="2026-07-28",
transports=("streamable-http",),
note="Only observable over streamable HTTP: headers are derived from the cached tool schema at the seam.",
),
"client-transport:http:stateless-ignores-session-id": Requirement(
source=f"{SPEC_2026_BASE_URL}/basic/transports#stateless-request-headers",
behavior=(