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TOOL-519: MCP client POC #2454

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TOOL-519: MCP client POC #2454

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@the-nick-fischer the-nick-fischer commented Dec 12, 2025 •
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This PR includes the following:

  • Implement needed changes on the chipmunk core: TOOL-516
    • Chipmunk internal MCP API]: Thin MCP API that bundles creation and interaction with the MCP client and server:
      • create and manage MCP API instances
      • run the MCP event loop to process incoming messages
      • methods to send messages to the MCP client and server
      • => application/apps/indexer/session/src/mcp_api/mod.rs
    • Chipmunk session changes:
      • Instantiate and start MCP server and client.
      • Send a mock test prompt
      • => application/apps/indexer/session/src/session.rs
    • Chipmunk state API: Example changes showcasing where UI triggers would be connected to the MCP API => application/apps/indexer/session/src/state/mod.rs
  • Implement a basic MCP client POC: TOOL-519
    • application/apps/indexer/session/src/state/mod.rs
    • new and start functions to create and spin up the MCP client (connecting to the MCP server)
    • run function that initializes conversation state and handles incoming messages (e.g. prompts form chipmunk) and processing of chat messages using the llm client
    • Abstraction layer for LLM clients => application/apps/indexer/mcp/src/client/llm/mod.rs
    • A mock LLM client that simulates LLM behavior without making actual API calls / without a HTTP client =>application/apps/indexer/mcp/src/client/llm/mock.rs

Note: Open topics or Notes are marked with // TODO:[MCP]
Note: contains log::warn!() statements for debug purposes. They will need to be removed / replaced by sensible debug statements.

Logical flow explained:

  • Chipmunk is started. In session.new()
  • The MCP server and client are instantiated
  • The MCP server is started
  • The MCP client is started
  • A mock prompt message is sent from chipmunk core via MCP api mpsc channel to the MCP client
  • The MCP client uses a mock LLM client to handle the prompt, which wants to make MCP tool call
  • The MCP client sends a tool invocation to the MCP server
  • The MCP server sends a tool / task request to the chipmunk core via mpsc channel
  • Chipmunk handles the request by sending a Search request via operations API
  • Result is returned to MCP server -> MCP client -> LLM client
  • LLM client sends a Final response

@the-nick-fischer the-nick-fischer force-pushed the mcp_client_poc branch 5 times, most recently from db65748 to b381781 Compare December 19, 2025 09:24
@the-nick-fischer the-nick-fischer marked this pull request as ready for review December 19, 2025 10:45
@the-nick-fischer
TOOL-519: Implement basic MCP client POC
f65526f 
TOOL-519: Improve client start functions and rework errors.

TOOL-519: Implement mock LLM client prototype and conversation state

TOOL-519: Add mock prompt message.

TOOL-519: Finalize MCP client MOCK POC

TOOL-519: fix cargo warnings

TOOL-519: Minor tweaks.
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@the-nick-fischer @sudeeptarlekar