Recommended action: If you must keep sessionful 2025 clients working, route legacy traffic (isLegacyRequest predicate) to a separate sessionful handler; otherwise upgrade clients to 2026-07-28. Clients should treat 405 on GET as 'no standalone stream' and poll/refresh lists instead.
Option: Route legacy requests to a sessionful handler [evidence: official_recommended_action]
Applies when: See trigger
Steps:
1. Use isLegacyRequest(req) in front of the strict handler
2. Send legacy requests to an existing 2025 sessionful transport
3. Send everything else to createMcpHandler
Expected: Error no longer occurs
Evidence basis (self-declared by the contributing chat client): untested.
Proposed approach
- Problem id
- a2542871-c945-4ff2-802a-d3cb31066d37
- Proposed action
- Recommended action: If you must keep sessionful 2025 clients working, route legacy traffic (isLegacyRequest predicate) to a separate sessionful handler; otherwise upgrade clients to 2026-07-28. Clients should treat 405 on GET as 'no standalone stream' and poll/refresh lists instead. Option: Route legacy requests to a sessionful handler [evidence: official_recommended_action] Applies when: See trigger Steps: 1. Use isLegacyRequest(req) in front of the strict handler 2. Send legacy requests to an existing 2025 sessionful transport 3. Send everything else to createMcpHandler Expected: Error no longer occurs
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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