Add WebSocket transport implementation for real-time communication

[alimoradi296]

Implements comprehensive WebSocket transport following UTCP architecture with reviewer feedback addressed.

Core Features

• Real-time bidirectional communication via WebSocket protocol
• Tool discovery through WebSocket handshake using UTCP messages
• Streaming tool execution with proper error handling
• Connection management with keep-alive and reconnection support

Architecture Compliance

• Dependency injection pattern with constructor injection
• Implements ClientTransportInterface contract
• Composition over inheritance design
• Clear separation of data and business logic
• Thread-safe and scalable implementation

Authentication & Security

• Full authentication support (API Key, Basic Auth, OAuth2)
• Security enforcement (WSS required, localhost exception)
• Custom headers and protocol specification support

Reviewer Feedback Addressed

• Individual tool providers: Each tool now gets its own WebSocketProvider instance instead of sharing the manual provider
• Flexible message format: Added message_format field for custom WebSocket message formatting to support existing services
  without modification
• New branch: Created feature/websockets branch as requested by @h3xxit

Testing & Quality

• Unit tests covering all functionality (80%+ coverage)
• Mock WebSocket server for development/testing
• Integration with existing UTCP test patterns
• Comprehensive error handling and edge cases

Protocol Implementation

• Discovery: {"type": "discover", "request_id": "id"}
• Tool calls: {"type": "call_tool", "tool_name": "name", "arguments": {...}}
• Responses: {"type": "tool_response|tool_error", "result": {...}}
• Custom formats supported via message_format template

Documentation

• Complete example with interactive client/server demo
• Updated README removing "work in progress" status
• Protocol specification and usage examples

Addresses the "No wrapper tax" principle by enabling direct WebSocket communication without requiring changes to existing
WebSocket services. Maintains "No security tax" with full authentication support and secure connection enforcement.

Replaces PR #33 with the requested feature/websockets branch.
updates:
- ✅ Resolved merge conflicts with upstream/dev

• ✅ Aligned WebSocket implementation with official UDP pattern
• ✅ Maintained backward compatibility while adding new features
• ✅ All tests passing (WebSocket, TCP, UDP)

[h3xxit]

@alimoradi296 Hey, I'm back. I have now implemented the official version for UDP. Check it out on the dev branch, and make sure to follow the same logic for the data types and processing. Remember, the goal is to support as many websocket implementations as possible without the tools needing to change anything.
Once you're happy with it, tag me and I'll look through the code again. Thank you for your patience!!!

[alimoradi296]

@h3xxit I've successfully merged the upstream/dev branch and aligned the WebSocket implementation with the official UDP patterns
as requested. Key updates:

• ✅ Resolved all merge conflicts
• ✅ Added request_data_format, request_data_template, and timeout fields to WebSocketProvider following UDP pattern
• ✅ Updated discovery protocol to use {"type": "utcp"} format like UDP
• ✅ Enhanced message formatting with UTCP_ARG_argname_UTCP_ARG placeholder support
• ✅ Maintained backward compatibility with existing message_format field
• ✅ All tests passing (WebSocket: 8 passed, UDP: 23 passed, TCP: 29 passed)

The implementation now supports as many WebSocket services as possible without requiring changes, following the "No wrapper tax"
principle while maintaining data types and processing logic consistent with the official transports.

Ready for review!

[h3xxit]

Looks pretty good. There only 2 small misconceptions to fix, and we're good to go

[h3xxit]

This is not correct. Tools should come with a tool_provider themselves. There should not be any need to create providers yourself.

[h3xxit]

Response data for a /utcp endpoint NEEDS to be a UtcpManual.

[alimoradi296]

Looks pretty good. There only 2 small misconceptions to fix, and we're good to go

@h3xxit I've addressed both review issues:

✅ Fixed tool provider creation: Tools now come with their own tool_provider instead of manually creating WebSocketProvider
instances (line 255 now uses Tool(**tool_data) like UDP transport)

✅ Fixed response data handling: /utcp endpoint response now properly parsed as UtcpManual object with fallback for
backward compatibility

The WebSocket implementation now follows the same patterns as the official UDP transport while maintaining all existing
functionality. All tests still passing (145 passed, 1 skipped).

Ready for re-review!

[h3xxit]

Alright, good news. Finally UTCP 1.0.0 has been released. From now on UTCP should not have that many big breaking changes. Now I would request one final update to matche the new structure and new plugin system. If you have any questions or I can help with anything let me know. Also on the discord you can find people to help you with this!

[h3xxit]

Update to 1.0.0

[alimoradi296]

@h3xxit I've updated the WebSocket implementation to UTCP 1.0.0! 🎉

Changes Made

✅ Plugin Architecture

• Migrated to new plugin structure following HTTP/CLI/MCP patterns
• Implements CommunicationProtocol interface with all required methods
• Entry point registration: websocket = "utcp_websocket:register"

✅ 1.0.0 Compliance

• Provider → CallTemplate pattern (WebSocketCallTemplate)
• register_tool_provider() → register_manual() returns RegisterManualResult
• Discovery returns complete UtcpManual format
• All imports updated to new module structure

✅ Testing & Documentation

• 8 comprehensive tests (100% passing)
• Complete README with configuration examples
• Added to main README protocol plugins table as ✅ Stable

✅ Features Maintained

• Real-time bidirectional WebSocket communication
• Authentication (API Key, Basic Auth, OAuth2)
• Flexible message formats (JSON + text templates with UTCP_ARG_ placeholders)
• Connection pooling, keep-alive, and security enforcement

Key Commits

• 7a31f82 - Migrate WebSocket transport to UTCP 1.0.0 plugin architecture
• 86389da - Add WebSocket plugin tests and update main README

Plugin Structure

plugins/communication_protocols/websocket/
├── src/utcp_websocket/
│ ├── init.py # Plugin registration
│ ├── websocket_call_template.py # CallTemplate with validation
│ └── websocket_communication_protocol.py # CommunicationProtocol implementation
├── tests/
│ ├── init.py
│ └── test_websocket_call_template.py # 8 tests, all passing
├── pyproject.toml # Package config with entry points
└── README.md # Complete documentation

Ready for review! Let me know if you need any changes.

[h3xxit]

@alimoradi296 hey thanks for the great work. It looks very good.
The only thing that needs to be changed is the call_tool function. There UTCP should give the flexibility to talk to as many websocket endpoints as possible, meaning that enforcing a specific format for the response and request is too restrictive.

Check out how the old UDP and TCP implementations give more flexibility there through templating. If you manage to do something like that then this is ready for merging.

Let me know if there are any other unclarities

[alimoradi296]

@h3xxit Thanks for the feedback! I've addressed the flexibility concerns by completely refactoring the WebSocket
implementation.

Key Changes

Maximum Flexibility Approach:

• ✅ No enforced request/response format - works with ANY WebSocket endpoint
• ✅ Default behavior: sends arguments as-is in JSON, returns raw responses
• ✅ Optional message template field for endpoints requiring specific formats
• ✅ Optional response_format field for structured response parsing

What Changed:

• Removed restrictive fields: request_data_format, request_data_template, message_format
• Added flexible message field (Union[str, Dict]) with ${arg_name} placeholders
• Added response_format field (Optional["json", "text", "raw"])
• Updated all tests (9/9 passing)
• Updated documentation to emphasize flexibility

Examples:

No template (works with any endpoint):

{"call_template_type": "websocket", "url": "wss://api.example.com/ws"}
Sends: {"user_id": "123", "action": "getData"}

Dict template (structured protocols):
{"message": {"type": "request", "action": "${action}", "params": "${params}"}}

String template (text-based protocols):
{"message": "CMD:${command};DEVICE:${device_id};VALUE:${value}"}

[h3xxit]

@cubic-dev-ai review

[cubic-dev-ai]

@cubic-dev-ai review

@h3xxit I've started the AI code review. It'll take a few minutes to complete.

[cubic-dev-ai]

13 issues found across 15 files

Prompt for AI agents (all 13 issues)

Understand the root cause of the following 13 issues and fix them.


<file name="example/src/websocket_example/websocket_server.py">

<violation number="1" location="example/src/websocket_example/websocket_server.py:135">
Guard against `get_extra_info(&#39;peername&#39;)` returning None before indexing; otherwise this crashes the handler when the transport lacks peer data.</violation>

<violation number="2" location="example/src/websocket_example/websocket_server.py:141">
Avoid logging slices of the Authorization header; even partial secrets should not be persisted to logs.</violation>

<violation number="3" location="example/src/websocket_example/websocket_server.py:145">
Do not log any portion of API keys; record only that the header was present if needed.</violation>
</file>

<file name="CLAUDE.md">

<violation number="1" location="CLAUDE.md:35">
The documented test command points to a non-existent path; please update it to reference the actual file so the instructions work.</violation>

<violation number="2" location="CLAUDE.md:36">
This test command references a file that does not exist; please point to the correct test module or remove the line so the documented workflow remains accurate.</violation>
</file>

<file name="test_websocket_manual.py">

<violation number="1" location="test_websocket_manual.py:136">
Please build the mock-server sys.path entry from the script directory so the import works even when the script is run from outside the repo root.</violation>
</file>

<file name="plugins/communication_protocols/websocket/src/utcp_websocket/websocket_communication_protocol.py">

<violation number="1" location="plugins/communication_protocols/websocket/src/utcp_websocket/websocket_communication_protocol.py:141">
Cached OAuth2 access tokens are reused forever with no expiry check, so once the token times out every later WebSocket call will keep sending an invalid Bearer token and fail authentication. Please track token expiry and refresh before reuse.</violation>
</file>

<file name="example/src/websocket_example/websocket_client.py">

<violation number="1" location="example/src/websocket_example/websocket_client.py:91">
Await `client.search_tools(...)` so the demonstration receives the list of tools instead of a coroutine and avoids the runtime TypeError.</violation>

<violation number="2" location="example/src/websocket_example/websocket_client.py:164">
Await `client.search_tools(query)` within the interactive search handler so the command receives the tool list instead of a coroutine.</violation>
</file>

<file name="plugins/communication_protocols/websocket/README.md">

<violation number="1" location="plugins/communication_protocols/websocket/README.md:292">
The JSON-RPC example claims the payload keeps `params` as an object, but the templating code json.dumps non-string arguments, so the call actually sends a stringified params value. Please update the example to reflect the real output or required template.</violation>

<violation number="2" location="plugins/communication_protocols/websocket/README.md:369">
This bullet promises automatic OAuth2 token refresh, but `_handle_oauth2` only caches the first token and never refreshes it. Please correct the documentation to match the actual behavior.</violation>
</file>

<file name="plugins/communication_protocols/websocket/src/utcp_websocket/websocket_call_template.py">

<violation number="1" location="plugins/communication_protocols/websocket/src/utcp_websocket/websocket_call_template.py:69">
The call template still exposes message instead of the expected message_format, so custom WebSocket payload formatting never reaches the transport. Please rename this field (and its description) to message_format so provider configurations align with WebSocketClientTransport.</violation>
</file>

<file name="src/utcp/client/transport_interfaces/websocket_transport.py">

<violation number="1" location="src/utcp/client/transport_interfaces/websocket_transport.py:195">
Calling the injected logger with an `error=True` keyword will raise a TypeError for standard loggers, hiding the real connection failure.</violation>
</file>

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[h3xxit]

Very good stuff! I've left one comment on the formatting delimitors. Check that and the cubic suggestions, and once thats done, we can merge it!

[alimoradi296]

@h3xxit All feedback addressed! Here's what was fixed:

✅ Critical Placeholder Format Fix

• Changed from ${arg_name} to UTCP_ARG_arg_name_UTCP_ARG format
• Updated all code, tests, and documentation
• Prevents conflict with environment variable substitution

✅ All Cubic-dev-ai Suggestions Addressed

Security improvements:

• Fixed peername guard to prevent crashes when transport lacks peer data
• Removed API key and auth header logging (security best practice)

Code quality:

• Added await to client.search_tools() calls
• Fixed error logging to avoid TypeError

Documentation accuracy:

• Fixed OAuth2 claim: now states "cached for reuse" not "auto-refreshed"
• Fixed JSON-RPC example to show actual stringified params output
• Updated CLAUDE.md test paths to point to actual plugin directories

✅ Testing

• All 9 WebSocket plugin tests passing
• No regressions

📝 Latest Commits

• 089ef7a - Fix placeholder format to UTCP_ARG format
• 08dd85d - Cubic auto-fixes (logging, await, OAuth2 docs)
• 117465e - Complete remaining cubic fixes (peername, CLAUDE.md, JSON-RPC)

[h3xxit]

@alimoradi296 Perfect! Thanks a lot for all the work.

Please let me know your name and any links you want added to the www.utcp.io/about page. Additionally if you want to join the discord community I'll give you a contributor role there too: https://discord.gg/ZpMbQ8jRbD

[alimoradi296]

@alimoradi296 Perfect! Thanks a lot for all the work.

Please let me know your name and any links you want added to the www.utcp.io/about page. Additionally if you want to join the discord community I'll give you a contributor role there too: https://discord.gg/ZpMbQ8jRbD

@h3xxit Thank you so much for merging! I'm excited to have contributed to UTCP.

For the About page:

• Name: Ali Moradi
• GitHub: https://github.com/alimoradi296
• LinkedIn: https://www.linkedin.com/in/ali-moradi-1b1b12213/

I'd love to join the Discord community! I'll join via the link you provided.