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Ed Zynda e6084b7bd0 feat(mcp): add MCP Tasks support at the SDK level (#21)
Implement Phase 1 of the MCP Tasks spec so long-running tools/call
requests can run asynchronously, survive proxy timeouts, and be
cancelled mid-flight.

- connection pool now advertises mcp.NewTasksCapability() during
  initialize and captures the InitializeResult so callers can detect
  per-server task support
- new MCPServerConfig.TasksMode (auto|never|always, default auto)
  parsed from both new and legacy mcp.json shapes
- ExecuteTool augments tools/call with TaskParams when policy and
  capability allow, polls tasks/get / tasks/result until terminal,
  and best-effort tasks/cancel on context cancellation
- new MCPToolManager methods: SetTaskConfig, ListServerTasks,
  GetServerTask, CancelServerTask
- public SDK surface in pkg/kit: MCPTask, MCPTaskStatus, MCPTaskMode,
  MCPTaskProgress, MCPTaskProgressHandler, plus Options fields
  (MCPTaskMode, MCPTaskTimeout, MCPTaskTTL, MCPTaskPollInterval,
  MCPTaskMaxPollInterval, MCPTaskProgress) and Kit.{List,Get,Cancel}
  MCPTask methods
- works around two upstream mcp-go v0.51.0 parser bugs
  (ParseCallToolResult rejects task responses; ParseTaskResultResult
  looks for content under a non-existent nested key) by decoding the
  wire shape directly via the transport
- defaults to MCPTaskModeAuto so servers that don't advertise task
  support behave exactly as before

Fixes #21
2026-05-04 16:51:09 +03:00
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