feat: VS Code Language Model Provider (experimental)#95

Merged

nikomatsakis merged 62 commits intosymposium-dev:mainfrom

nikomatsakis:vscodelm-prototype

Jan 7, 2026

Commits on Jan 7, 2026

feat(vscode): add Language Model Provider prototype

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refactor(vscodelm): use sacp infrastructure for JSON-RPC

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refactor(vscodelm): remove unnecessary Arc<Mutex> from Eliza state

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feat(vscodelm): implement Component trait and add tests

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test(vscodelm): use expect-test for snapshot testing

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chore: remove outdated content
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refactor: cleanup the test to avoid mutex
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refactor: cleanup the method flow
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refactor: cleanup logging a bit
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fix: always log commands to VSCode's output window
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fix: handle all VS Code LM message part types correctly

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feat: add session actor for VS Code LM provider

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feat: add session UUID logging to vscodelm

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feat: add configurable agent backend to vscodelm

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fix: correct McpServer serialization format in TypeScript

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docs: update lm-provider design doc with agent configuration protocol

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feat: support AgentDefinition enum in vscodelm protocol

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refactor: resolve symposium builtins to embedded binary path

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docs: add Language Model Tool Bridging design and VS Code API references

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feat: add cancellation support for vscodelm

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refactor: use futures channels and merged streams for vscodelm cancellation

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feat: implement agent-internal tool permission bridging for vscodelm

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refactor: use MatchMessage in process_session_message

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WIP: refactor session model and unify ContentPart type

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feat: introduce HistoryActor for centralized session state management

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refactor: apply edits from nikomatsakis review
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feat: pass chat request options from VS Code to Rust backend

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chore: bump vscode extension version to 1.2.0

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fix: remove toolCallId from agent action input schema

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fix: normalize messages for history matching

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feat: stream tool calls as markdown in VS Code LM provider

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feat: expose one language model per ACP agent

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feat: show all registry agents in LM picker with auto-install

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feat: show all registry agents in settings panel with auto-install

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chore: remove Codex and Gemini from built-in agents

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chore: sort agent lists alphabetically

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refactor: pass invocation_tx to VscodeToolsMcpServer constructor

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refactor: replace tokio::select! with futures-concurrency race

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refactor: handle_vscode_tool_invocation takes ownership pattern

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feat: race peek against cancellation in handle_vscode_tool_invocation

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refactor: add cancel_tool_invocation helper and clean up race formatting

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refactor: add RequestState::on_cancel helper for racing cancellation

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fix: wrap agent in Conductor for MCP-over-ACP negotiation

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fix: use VscodeToolsProxy in Conductor chain for MCP-over-ACP

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Revert "fix: use VscodeToolsProxy in Conductor chain for MCP-over-ACP"
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feat: accept RUST_LOG-style filter strings in --log argument

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fix: defer session creation until first request arrives

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test: add vscodelm integration tests with expect_test assertions

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fix: use actual Eliza response in multi-turn test history

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fix: don't race against stale cancel_rx when waiting for tool result

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test: remove flaky vscodelm integration tests

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refactor: move vscodelm tests to separate module

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refactor: more DRY
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fix: don't race against stale cancel_rx when waiting for tool result

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refactor: clarify why we are dropping request_state
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refactor: rename mcp server
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feat: add vscodelm_cli example for debugging tool invocation

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feat: add --log-file option to vscodelm_cli example

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fix: auto-approve tool requests from vscode tools
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fix: strip mcp__ prefix in vscode_tools call_tool handler

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feat: move the LM stuff behind an experimental pref
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docs: document experimental status of Language Model Provider

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