[PLT-2386] docs: supported MCP protocol versions + 2026-07-28 client guidance#1084
Draft
pmdroid wants to merge 2 commits into
Draft
[PLT-2386] docs: supported MCP protocol versions + 2026-07-28 client guidance#1084pmdroid wants to merge 2 commits into
pmdroid wants to merge 2 commits into
Conversation
Documents the three MCP protocol versions Arcade gateways support (2026-07-28, 2025-11-25, 2025-06-18), how version selection works via the MCP-Protocol-Version header, 2026-07-28 gateway capabilities including the OAuth url-mode elicitation retry flow, and legacy session behavior. PLT-2386
|
The latest updates on your projects. Learn more about Vercel for GitHub.
|
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary
Adds a customer-facing docs page at
/guides/mcp-gateways/protocol-versionsdocumenting which MCP protocol versions Arcade gateways support:2026-07-28,2025-11-25,2025-06-18— all fully supported, none deprecatedMCP-Protocol-Versionheader, no config changes or migration needed2026-07-28gateway capabilities:tools/list/tools/callincl. structured output, OAuth authorization via the MRTR url-mode elicitation retry flow (with an example request/response payload), and what's explicitly not supported (roots/sampling/logging, server-initiated streaming/notifications, extensions)2025-11-25/2025-06-18, and that2026-07-28requests ignoreMcp-Session-Id2026-07-28clients against gateways backed by legacy external MCP serversContent was verified against the
mcp-incomingBDD feature files in the monorepo (tests/behaviors/mcp-incoming/), using real payload shapes from the stateless OAuth elicitation scenarios for the example request/response.Tool discovery (
SelectTools/UseTool) is intentionally omitted — that design just changed under PLT-2489 and nothing has shipped, so there's nothing accurate to document yet.This page must not merge before GA (PLT-2377). The
2026-07-28sessionless path is currently gated behind themcp-2026-protocol-rolloutfeature flag in the engine; this page describes target/shipped behavior for when that flag is fully rolled out. Discovery docs (SelectTools/UseTool) follow under PLT-2489 once that design lands.Test plan
pnpm buildpassespnpm test(752 tests) passespnpm check-metapassesvaleon the changed files reports 0 errors🐕 Written by Kyoto, an AI agent, on Pascal's behalf —