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Python: [BREAKING] Add MCP 2.x compatibility foundation - #9236

Merged

Jose Alvarez (jpalvarezl) merged 57 commits into

mainfrom

jpalvarezl-feature/mcp-v2-server-migration

Oct 15, 2026

Merged

Python: [BREAKING] Add MCP 2.x compatibility foundation#9236
Jose Alvarez (jpalvarezl) merged 57 commits into
mainfrom
jpalvarezl-feature/mcp-v2-server-migration

Commits on Oct 15, 2026
- Updated mcp to 2.x (websocket optional is part of the core now)
  Jose Alvarez (jpalvarezl)
  committed
  4cb375b
- Added client test for agents as mcp_servers
  Jose Alvarez (jpalvarezl)
  committed
  9fc5821
- More casing fixes
  Jose Alvarez (jpalvarezl)
  committed
  9ca48e2
- Unit tests for legacy and v2 MCP server
  Jose Alvarez (jpalvarezl)
  committed
  e8135b0
- Using MCPError in samples for consistency with internal behaviour
  Jose Alvarez (jpalvarezl)
  committed
  2ef1694
- Migrated test_mcp to use new types
  Jose Alvarez (jpalvarezl)
  committed
  d02c0cd
- collection for test_mcp
  Jose Alvarez (jpalvarezl)
  committed
  26abdee
- collection passes for test_mcp_observability and test_mcp_skills
  Jose Alvarez (jpalvarezl)
  committed
  9caaceb
- Migrated message_handler
  Jose Alvarez (jpalvarezl)
  committed
  bc759d4
- deprecated MCPWebsocketTool
  Jose Alvarez (jpalvarezl)
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  af656e1
- deprecated MCPWebsocketTool, part 2
  Jose Alvarez (jpalvarezl)
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  f6610a6
- documentation updates
  Jose Alvarez (jpalvarezl)
  committed
  186d59b
- Removed MCP Tasks to start work on new mcp v2 API
  Jose Alvarez (jpalvarezl)
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  d1700ee
- Fix MCP v2 conversion error assertions
  Jose Alvarez (jpalvarezl)
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  03ecd6f
- Moved transport setup to mcp.Client, added test for v2. Needs legacy check
  Jose Alvarez (jpalvarezl)
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  c9b9616
- Added legacy handshake unit test
  Jose Alvarez (jpalvarezl)
  committed
  c8108c6
- Added tool/call mock and assertions
  Jose Alvarez (jpalvarezl)
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  42b7e08
- Adjusted sampling capabilities test
  Jose Alvarez (jpalvarezl)
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  966bcb6
- removing ClientSession references in favour of using mcp.Client
  Jose Alvarez (jpalvarezl)
  committed
  e69a08f
- Assert preserve headers
  Jose Alvarez (jpalvarezl)
  committed
  e3d3c5e
- Added session negotiation tests
  Jose Alvarez (jpalvarezl)
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  e4da143
- Sampling capabilities
  Jose Alvarez (jpalvarezl)
  committed
  e0d439a
- basic tools support completed
  Jose Alvarez (jpalvarezl)
  committed
  6cf3562
- test cleanup
  Jose Alvarez (jpalvarezl)
  committed
  6ff82f7
- Added support for ResourceLink for prompts
  Jose Alvarez (jpalvarezl)
  committed
  7539779
- Added MCP client as a private field, set usage precedence 1st mcp_client, 2nd raw session
  Jose Alvarez (jpalvarezl)
  committed
  e6da829
- Prompt migrated to use mcp_client -> session
  Jose Alvarez (jpalvarezl)
  committed
  2545c9d
- Migrated list/tools and list/prompts
  Jose Alvarez (jpalvarezl)
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  efbeccf
- Made protocol seam explicit with _MCPConnection
  Jose Alvarez (jpalvarezl)
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  c16ee5f
- Restore exact MCP v2 source tree
  Jose Alvarez (jpalvarezl)
  committed
  521e1f0
- Complete MCP 2.x client compatibility foundation
  Jose Alvarez (jpalvarezl)
  committed
  e03d6a3
- Fix MCP v2 CI typing compatibility
  Jose Alvarez (jpalvarezl)
  committed
  eabf6b3
- Use httpx2 for MCP transport consumers
  Jose Alvarez (jpalvarezl)
  committed
  c6c4b06
- Update declarative MCP lifecycle fixture
  Jose Alvarez (jpalvarezl)
  committed
  d083137
- Use httpx2 in declarative MCP sample
  Jose Alvarez (jpalvarezl)
  committed
  322aa23
- Fix MCP optional import and timeout propagation
  Jose Alvarez (jpalvarezl)
  committed
  82f3244
- Address MCP v2 server review feedback
  Jose Alvarez (jpalvarezl)
  committed
  7241a1e
- Address final MCP v2 review feedback
  Jose Alvarez (jpalvarezl)
  committed
  199b911
- Restore read-only MCP client protocol property
  Jose Alvarez (jpalvarezl)
  committed
  09146e8
- Use Tenacity for MCP subscription recovery
  Jose Alvarez (jpalvarezl)
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  1c19068
- Use compatible Tenacity dependency interval
  Jose Alvarez (jpalvarezl)
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  5fce018
- Retry complete MCP subscription lifecycles
  Jose Alvarez (jpalvarezl)
  committed
  49ea549
- Suppress expected WebSocket deprecation diagnostic
  Jose Alvarez (jpalvarezl)
  committed
  28a0e04
- Moved tenacity to all and MCPTaskOptions to init
  Jose Alvarez (jpalvarezl)
  committed
  c0b9fab
- Fixed seam leak for logging
  Jose Alvarez (jpalvarezl)
  committed
  89b6a74
- fixed checked values for task_support
  Jose Alvarez (jpalvarezl)
  committed
  2a6eab2
- changed meta and arguments to typed mappings
  Jose Alvarez (jpalvarezl)
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  0191611
- Narrower types for subclasses
  Jose Alvarez (jpalvarezl)
  committed
  0e5b888
- using right types for logging
  Jose Alvarez (jpalvarezl)
  committed
  a34c8bb
- adjusted _skills.py types
  Jose Alvarez (jpalvarezl)
  committed
  a4895a1
- Fix MCP v2 prompt refresh CI
  Jose Alvarez (jpalvarezl)
  committed
  9923e52
- re-removing MCPTaskOptions from init
  Jose Alvarez (jpalvarezl)
  committed
  d28fc9b
- updated error message for tenacity installation
  Jose Alvarez (jpalvarezl)
  committed
  f1506c5
- Added ping to the seam
  Jose Alvarez (jpalvarezl)
  committed
  6f69396
- ping from Client is also sent for legacy server scenarios
  Jose Alvarez (jpalvarezl)
  committed
  7e73bfd
- Fixes for CI
  Jose Alvarez (jpalvarezl)
  committed
  a893b19
- PR feedback: added MCPTaskOption deprecation warning shell and contextvar import fix
  Jose Alvarez (jpalvarezl)
  committed
  91611a3

Commits

Commits on Oct 15, 2026