feat: integrate Claude Agent SDK capabilities — model/command discovery, effort/thinking, MCP runtime, file rewind, structured output
Systematically integrate high-value SDK capabilities while preserving the
multi-provider architecture:
SDK capability discovery (per-provider cache):
- agent-sdk-capabilities.ts: cache models, commands, account info, MCP status
per provider via Map<providerId, cache> to prevent cross-provider pollution
- claude-client.ts: fire-and-forget captureCapabilities() after query() init
- providers/models: merge SDK models with static defaults
- skills: merge SDK slash commands with filesystem skills
Query options passthrough:
- thinking (adaptive/enabled/disabled), effort (low/medium/high/max),
outputFormat, agents, enableFileCheckpointing
- /chat page.tsx: first-message path now includes effort/thinking (was missing)
- stream-session-manager: passes effort/thinking in POST body
Graceful interrupt:
- /api/chat/interrupt: conversation.interrupt() before abort fallback
- stream-session-manager: tries interrupt first, aborts after 2s timeout
MCP runtime management:
- /api/plugins/mcp/status: live status from active Query, auto-resolves
providerId from session DB record (prevents wrong-provider cache writes)
- /api/plugins/mcp/reconnect + toggle: reconnect/enable/disable servers
- McpManager + McpServerList: runtime status indicators with action buttons
File checkpointing & rewind:
- enableFileCheckpointing=true for code mode by default
- rewind_point SSE: only emitted for prompt-level user messages
(parent_tool_use_id===null) and skips autoTrigger turns
- /api/chat/rewind: dry-run preview + actual rewind via rewindFiles()
- MessageList: RewindButton with dry-run preview
Structured output:
- /api/chat/structured: reads SDKResultSuccess.structured_output as primary
path, text fallback only when absent
Account info & thinking config:
- /api/sdk/account: cached account info display
- Settings: thinking_mode in ALLOWED_KEYS, thinking mode selector in UI
- Effort selector in MessageInput with lifted state pattern
New files: 11 route handlers + 2 lib modules + 1 test file
Modified files: 18 (types, client, manager, UI components, i18n)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
