feat: add 2026-02-25 weekly meeting notes (#21)

meetings/2026-02-25_weekly.md

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+# 2026-02-25 Transports WG (Weekly)
+
+## TL;DR
+The working group agreed to advance the Multi-Roundtrip Request (MRTR)
+Specification Enhancement Proposal (SEP) to the core contributors for initial
+feedback, despite open questions regarding SDK backward compatibility. To manage
+the SEP's complexity, the group decided to decouple a significant redesign of
+the Tasks API from the current proposal. Caitie McCaffrey will formalize the
+schema changes, which treat requests for more information as optional parameters
+to gracefully handle client mismatches. Additionally, Shaun Smith presented an
+early draft for Session management. The group discussed open design questions
+regarding server identity, Key-Value store usage, and handling servers that mix
+stateful and stateless tools, culminating in an action item for Shaun Smith to
+draft a formal SEP detailing these specific use cases.
+
+## Detailed Summary
+
+### MRTR SEP: Error Handling & Mismatched Inputs
+* Caitie McCaffrey submitted a PR to address error handling, proposing that
+  servers treat requests for more information as optional parameters.
+* If a client returns unexpected or mismatched data (e.g., returning only one of
+  two requested parameters), the server should simply ignore the unexpected data
+  and re-request the missing information.
+* The group agreed this should be framed as guidance for tool developers rather
+  than strict protocol-level error handling.
+* Concerns about infinite loops from clients repeatedly sending bad data should
+  be handled via standard rate limiting and throttling, not at the protocol
+  level.
+
+### MRTR SEP: Persistent Workflow & Tasks API
+* Luca Chang and Mark Roth discussed simplifying the persistent workflow by
+  combining task status, input responses, and final results into a single
+  unified `tasks continue` RPC.
+* However, to prevent the MRTR SEP from becoming overly bloated, the group
+  reached a consensus to decouple this larger Tasks API redesign from the
+  current MRTR proposal.
+* The group will proceed with the current MRTR structures and signal to SDK
+  maintainers that the Tasks API remains experimental and subject to future
+  optimization.
+
+### SEP Advancements & Core Contributor Review
+* Despite concerns raised by Shaun Smith and Peter Alexander regarding SDK
+  backward compatibility and the lack of a live reference implementation, the
+  group voted (7 approvals, 2 abstentions) to advance the MRTR SEP to the core
+  maintainers to gather early feedback.
+* Caitie McCaffrey, Mark Roth, and Gabriel Zimmerman will finalize the schema
+  changes by Friday to prepare for this review.
+* The separate Request-Response Association SEP was confirmed as accepted, and
+  Caitie McCaffrey will proceed with merging it into the main repository.
+
+### Sessions Proposal (V2)
+* Shaun Smith demonstrated a rough draft PR for session management, utilizing
+  the `meta` tag for cookie data to enable features like session creation,
+  resumption, and deletion.
+* Open questions remain regarding server identity, the inclusion of a Key-Value
+  (KV) store within the session data, and whether to include list/recover
+  operations.
+* Caitie McCaffrey raised a critical scoping concern regarding the complexity of
+  mixing stateful (session-based) and stateless tools within a single MCP
+  server, suggesting that servers should ideally operate entirely in one
+  paradigm or the other.
+* Kurtis Van Gent tasked Shaun Smith with drafting a concrete SEP that
+  explicitly compares the approach to HTTP cookies and outlines the specific use
+  cases and flows for session support.
+
+## Action Items
+- [ ] Caitie McCaffrey to format the error handling PR as guidance for tool
+  developers rather than a strict protocol-level error handling mechanic.
+- [ ] Caitie McCaffrey, Mark Roth, and Gabriel Zimmerman to finalize and publish
+  the proper set of schema changes for the MRTR SEP by Friday.
+- [ ] Caitie McCaffrey to ping Dan to confirm the merge of the Request-Response
+  Association SEP.
+- [ ] Kurtis Van Gent to request time in the upcoming core contributors meeting
+  for the MRTR SEP, send the relevant links, and ensure Mark Roth is added to
+  the invite to discuss rationale.
+- [ ] Shaun Smith to draft a concrete SEP for Sessions that covers use cases, a
+  comparison to HTTP cookies, and the flow/overlap for MCP servers mixing
+  session and non-session support.