Closes 2 architect audit P3 findings. MVP on the USB-droppable brain
vision — one brain directory now serves every platform.
Schema v2 — per-platform mcp_server dispatch:
[paths.mcp_server]
darwin-arm64 = 'bin/kei-mcp-server-darwin-arm64'
darwin-x64 = 'bin/kei-mcp-server-darwin-x64'
linux-x64 = 'bin/kei-mcp-server-linux-x64'
linux-arm64 = 'bin/kei-mcp-server-linux-arm64'
windows-x64 = 'bin/kei-mcp-server-windows-x64.exe'
Schema v1 (single string) still accepted — v0.19 brains load unchanged.
Implementation:
brain.rs — new McpServerPath enum (Single / PerPlatform BTreeMap<String, String>)
with #[serde(untagged)]. Brain::current_platform_key() maps std::env::consts
(macos→darwin, x86_64→x64, aarch64→arm64) to canonical key format.
mcp_server_path() now returns Result — looks up current platform,
returns Error::NoPlatformBinary { os, arch, available } if missing.
Pre-canonicalized cache field removed so partial v2 brains load for
status (just fail at actual resolve).
brain_validate.rs — validate_schema accepts MIN..=MAX range (1 or 2);
check_all_paths iterates v2 map entries for confinement check.
ClientAdapter::post_attach_hint() — default method + 4 overrides:
claude_code: 'run /help in Claude Code to verify the MCP server is reachable'
cursor: 'reload Cursor window (Cmd+Shift+P → Reload Window) to pick up the MCP server'
continue_adapter: 'reload the Continue extension in VS Code (or restart) to pick up the MCP server'
zed: 'run Zed :reload command to pick up the MCP server config'
attach.rs prints adapter.post_attach_hint() instead of the hardcoded
Claude-Code-specific string. No more client leak in orchestrator.
Error::NoPlatformBinary { os, arch, available } with thiserror Display.
Tests: 16 existing + 4 new = 20/20 pass.
- schema_v2_current_platform_resolves
- schema_v2_missing_current_platform_errors (macOS-gated)
- schema_v1_still_readable_with_v2_code
- post_attach_hint_is_adapter_specific
Constructor Pattern: all files <200 LOC (continue_adapter.rs 197 LOC
max). All fns <30 LOC (current_platform_key + check_all_paths 19 LOC max).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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