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Rebased and cleaned-up version of PR #113 by @mricharz, resolved against current main (including Codex engine, Gemini thought_signature, and agent manager fixes merged since the original PR). MCP Transport & Client: - StreamableHTTPTransport with session tracking, SSE parsing, timeouts - MCPClient.initialize() sends proper MCP handshake (protocolVersion, capabilities, clientInfo) + notifications/initialized - Fix StdioTransport constructor: command=[command] + args - MCPRequest.to_dict() with notification support (id=None) External MCP Discovery: - _discover_external_mcp supports both url (HTTP) and command (stdio) - Per-server include_tools / exclude_tools filtering - MCP clients persisted on JarvisSystem for runtime lifetime Streaming Tool-Call Support (stream_full): - StreamChunk dataclass in _stubs.py (content, tool_calls, finish_reason, usage) - Default stream_full() on InferenceEngine ABC wraps stream() for backward compat - _OpenAICompatibleEngine.stream_full() with SSE parsing - CloudEngine: _stream_full_openai (OpenAI/OpenRouter/MiniMax/Codex routing) _stream_full_anthropic (event-based → OpenAI delta format) - InstrumentedEngine, MultiEngine: stream_full delegation - GuardrailsEngine: stream_full with post-hoc security scanning (FIXED: original PR bypassed output scanning — now accumulates and scans like stream()) Other improvements: - _prepare_anthropic_messages() extracted to eliminate duplication - Default tool_choice=auto when tools are provided (OpenAI compat engines) - MCP tool injection into managed agent streaming path - Documentation: docs/user-guide/mcp-external-servers.md Tests: ~59 new tests across 8 test files, all passing. Closes PR #113 Co-Authored-By: mricharz <mricharz@users.noreply.github.com> Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>