do not modify the agent tools at runtime, as agent can be used concurrently.

[yuval-k]

main change is removal of skills plugin as it mutates the agent on every invocation. instead, use add_skills_tool_to_agent when initializing.
In similar fashion - same for STS - apply it on init and not as a plugin. for this to work needed to update ADK to use the new header_provider available in MCPToolSet.

also:

• merged together build and build_local in _a2a.py to make it easier to maintain.
• changed e2e tests to each use a unique agent, and added a timeout to SendMessage, both with the intention of reducing flakes
• fixed the cli test command, added a main.go to mock llm server. this allows to test e2e scenarios with just an agent and mock llm (without kagent), making it easier to debug. See README.md in the e2e test folder
• Due to a bug in ADK ([BUG]: Inifinite loop when using code_executor google/adk-python#3921) disabled execute code blocks for now.

[Copilot]

Pull request overview

This PR removes the SkillsPlugin class to prevent concurrent runtime modifications of agent tools. Instead of using a plugin-based approach that modifies agent tools during callbacks, skills are now added directly to agents at initialization time via the add_skills_tool_to_agent function.

Key changes:

• Removed the SkillsPlugin class that used before_agent_callback to modify agent tools at runtime
• Replaced plugin usage with direct tool addition via maybe_add_skills helper function
• Updated dependency versions for agentsts-adk, agentsts-core, and google-adk

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
python/packages/kagent-adk/src/kagent/adk/skills/skills_plugin.py	Removed the SkillsPlugin class definition
python/packages/kagent-adk/src/kagent/adk/skills/init.py	Removed SkillsPlugin from module exports
python/packages/kagent-adk/src/kagent/adk/cli.py	Added maybe_add_skills helper and replaced plugin usage with direct tool addition
python/packages/kagent-adk/src/kagent/adk/_a2a.py	Removed plugins parameter usage in static command and added token propagation logic
python/packages/kagent-adk/pyproject.toml	Updated dependency versions

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