PS_AI_Agent/.claude/session_log_2026-02-19.md

Session Log — 2026-02-19

Project: PS_AI_Agent (Unreal Engine 5.5) Machine: Desktop PC (j_foucher) Working directory: E:\ASTERION\GIT\PS_AI_Agent

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Conversation Summary

1. Initial Request

User asked to create a plugin to use the ElevenLabs Conversational AI Agent in UE5.5. Reference: existing Convai plugin (gRPC-based, more complex). Goal: simpler version using ElevenLabs. Plugin name requested: PS_AI_Agent_ElevenLabs.

2. Codebase Exploration

Explored the Convai plugin source at ConvAI/Convai/ to understand:

• Module/settings structure
• AudioCapture patterns
• HTTP proxy pattern
• gRPC streaming architecture (to know what to replace with WebSocket)
• Convai already had EVoiceType::ElevenLabsVoices — confirming the direction

3. Plugin Created

All source files written from scratch under: Unreal/PS_AI_Agent/Plugins/PS_AI_Agent_ElevenLabs/

Files created:

• PS_AI_Agent_ElevenLabs.uplugin
• PS_AI_Agent_ElevenLabs.Build.cs
• Public/PS_AI_Agent_ElevenLabs.h — Module + UElevenLabsSettings
• Public/ElevenLabsDefinitions.h — Enums, structs, protocol constants
• Public/ElevenLabsWebSocketProxy.h + .cpp — WS session manager
• Public/ElevenLabsConversationalAgentComponent.h + .cpp — Main NPC component
• Public/ElevenLabsMicrophoneCaptureComponent.h + .cpp — Mic capture
• PS_AI_Agent.uproject — Plugin registered

Commit: f0055e8

4. Memory Files Created

To allow context recovery on any machine (including laptop):

• .claude/MEMORY.md — project structure + patterns (auto-loaded by Claude Code)
• .claude/elevenlabs_plugin.md — plugin file map + API protocol details
• .claude/project_context.md — original ask, intent, short/long-term goals
• Local copy also at C:\Users\j_foucher\.claude\projects\...\memory\

Commit: f0055e8 (with plugin), updated in 4d6ae10

5. .gitignore Updated

Added to existing ignores:

• Unreal/PS_AI_Agent/Plugins/*/Binaries/
• Unreal/PS_AI_Agent/Plugins/*/Intermediate/
• Unreal/PS_AI_Agent/*.sln / *.suo
• .claude/settings.local.json
• generate_pptx.py

Commit: 4d6ae10, b114ab0

6. Compile — First Attempt (Errors Found)

Ran Build.bat PS_AI_AgentEditor Win64 Development. Errors:

• WebSockets listed in .uplugin — it's a module not a plugin → removed
• OpenDefaultCaptureStream doesn't exist in UE 5.5 → use OpenAudioCaptureStream
• FOnAudioCaptureFunction callback uses const void* not const float* → fixed cast
• TArray::RemoveAt(0, N, false) deprecated → use EAllowShrinking::No
• AudioCapture is a plugin and must be in .uplugin Plugins array → added

Commit: bb1a857

7. Compile — Success

Clean build, no warnings, no errors. Output: Plugins/PS_AI_Agent_ElevenLabs/Binaries/Win64/UnrealEditor-PS_AI_Agent_ElevenLabs.dll

Memory updated with confirmed UE 5.5 API patterns. Commit: 3b98edc

8. Documentation — Markdown

Full reference doc written to .claude/PS_AI_Agent_ElevenLabs_Documentation.md:

• Installation, Project Settings, Quick Start (BP + C++), Components Reference, Data Types, Turn Modes, Security/Signed URL, Audio Pipeline, Common Patterns, Troubleshooting.

Commit: c833ccd

9. Documentation — PowerPoint

20-slide dark-themed PowerPoint generated via Python (python-pptx 1.0.2):

• File: PS_AI_Agent_ElevenLabs_Documentation.pptx in repo root
• Covers all sections with visual layout, code blocks, flow diagrams, colour-coded elements
• Generator script generate_pptx.py excluded from git via .gitignore

Commit: 1b72026

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Git History (this session)

Hash	Message
f0055e8	Add PS_AI_Agent_ElevenLabs plugin (initial implementation)
4d6ae10	Update .gitignore: exclude plugin build artifacts and local Claude settings
b114ab0	Broaden .gitignore: use glob for all plugin Binaries/Intermediate
bb1a857	Fix compile errors in PS_AI_Agent_ElevenLabs plugin
3b98edc	Update memory: document confirmed UE 5.5 API patterns and plugin compile status
c833ccd	Add plugin documentation for PS_AI_Agent_ElevenLabs
1b72026	Add PowerPoint documentation and update .gitignore

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Key Technical Decisions Made This Session

Decision	Reason
WebSocket instead of gRPC	ElevenLabs Conversational AI uses WS/JSON; no ThirdParty libs needed
AudioCapture in .uplugin Plugins array	It's an engine plugin, not a module — UBT requires it declared
WebSockets in Build.cs only	It's a module (no .uplugin file), declaring it in .uplugin causes build error
FOnAudioCaptureFunction uses const void*	UE 5.3+ API change — must cast to float* inside callback
EAllowShrinking::No	Bool overload of RemoveAt deprecated in UE 5.5
USoundWaveProcedural for playback	Allows pushing raw PCM bytes at runtime without file I/O
Silence threshold = 30 ticks	~0.5s at 60fps heuristic to detect agent finished speaking

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Next Steps (not done yet)

• Open in UE 5.5 Editor and test with a real ElevenLabs agent
• Verify mic audio actually reaches ElevenLabs (enable Verbose Logging)
• Test USoundWaveProcedural underflow behaviour in practice
• Add lip-sync support (future)
• Add session memory / conversation history (future, matching Convai)
• Add environment/action context support (future)
• Consider Signed URL Mode backend implementation