feat: add 2026-04-08 weekly meeting notes (#32)

meetings/2026-04-08_weekly.md

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+# 2026-04-08 Transports WG (Weekly)
+
+## TL;DR
+The group discussed the outcomes of the recent Dev Summit, most notably the core
+maintainers' decision to officially remove sessions from the protocol and
+establish the new Multi-Roundtrip Request (MRTR) pattern as the default. Peter
+Alexander will draft the Specification Enhancement Proposal (SEP) for session
+removal, which will drastically simplify SEP 1442. The group also refined the
+scope of MRTR, deciding that elicitation will be restricted to specific requests
+(`read resources`, `get prompt`, `call tool`, and `get task payload request`)
+and explicitly disallowed on `list` requests to preserve caching functionality.
+Finally, the group agreed that Time-To-Live (TTL) functionality must be included
+in the June release to support caching without Server-Sent Events (SSE), and
+established ownership for several upcoming SEPs to meet the looming deadlines.
+
+## Detailed Summary
+
+### Dev Summit Outcomes and Process
+* **Session Removal:** Core maintainers voted to eliminate sessions from the
+  protocol. This decision significantly reduces the scope of SEP 1442 (which
+  Kurtis Van Gent will now rewrite). Peter Alexander is tasked with drafting a
+  standalone SEP explicitly documenting the removal of sessions.
+* **MRTR Code Pattern:** The async code pattern has been officially deprecated,
+  making the new MRTR pattern the default. Stephen Halter provided a link to a
+  reference implementation comparing the old and new methods.
+* **Tracking and Backlog:** Kurtis Van Gent is creating a tracking spreadsheet
+  and a prioritized backlog to monitor the progress of all SEPs (MRTR, Pluggable
+  Transports, 1442, etc.) toward reference implementation and finalization for
+  the June release.
+* **Draft Versioning:** Stephen Halter raised the need for a standardized
+  protocol version string for the draft SDKs to facilitate compatibility
+  testing. Suggestions included `2026-draft` or prefixing with a date. Stephen
+  will follow up with SDK maintainers to align on a standard string.
+
+### Technical Decisions: MRTR Scope and Capabilities
+* **Restricting Elicitation:** Caitie McCaffrey proposed scoping down the client
+  requests that support server requests for additional information
+  (elicitation). 
+* **Allowed Requests:** The group agreed to restrict elicitation to `read
+  resources`, `get prompt`, `call tool`, and `get task payload request`. 
+* **Disallowed Requests:** Elicitation will *not* be permitted on `ping`,
+  `initialize`, `list` requests (e.g., `list tools`), or task-related endpoints.
+  This restriction ensures that tools lists remain cacheable and do not mutate
+  based on individual request contexts.
+* **Capabilities on Tool Lists:** Because the protocol is stateless and
+  elicitation is no longer allowed on `list tools`, a client might call a tool
+  requiring elicitation without actually supporting it. Gabriel Zimmerman
+  proposed an SEP to allow the server to return the required capabilities for
+  specific tools alongside the tool list.
+
+### Technical Decisions: Caching, TTLs, and Deprecations
+* **Feature Deprecations:** Peter Alexander noted that `sampling roots` and `log
+  level` (or logging altogether) are candidates for deprecation in the upcoming
+  release. Prompts will remain as they are actively used. Andreas Schlapbach
+  highlighted the need for a formal deprecation policy (sunsetting before
+  removal).
+* **Time-To-Live (TTL):** Kurtis Van Gent stressed that TTL functionality is
+  critical for the current release to support caching, especially since the
+  protocol is moving away from reliance on SSE streams. 
+* **TTL Scope:** Mark Roth clarified that the TTL mechanism acts similarly to a
+  DNS TTL (a maximum cache time for previous results) and must work for both
+  HTTP and standard IO transports. Caitie McCaffrey volunteered to draft this
+  SEP to expedite the process.
+
+## Action Items
+- [ ] **Peter Alexander** to write the SEP officially removing sessions from the
+  protocol.
+- [ ] **Kurtis Van Gent** to rewrite SEP 1442 reflecting the removal of sessions
+  and initialization.
+- [ ] **Kurtis Van Gent** to finalize the tracking spreadsheet and prioritized
+  backlog of all SEPs targeted for the June release by the end of the week.
+- [ ] **Caitie McCaffrey** to compile a list of Tasks-related SEPs and send them
+  to Kurtis for the tracking spreadsheet.
+- [ ] **Stephen Halter** to coordinate with SDK maintainers to align on a
+  standardized protocol version string for the draft.
+- [ ] **Caitie McCaffrey** to draft the SEP defining Time-To-Live (TTL) fields
+  for relevant primitives.
+- [ ] **Gabriel Zimmerman** to write an SEP specifying how servers can declare
+  required capabilities for specific tools within the tool list.