feat(mcp): add OpenCode as an MCP install target#758
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OpenCode reads MCP servers from ~/.config/opencode/opencode.json under a top-level mcp key, with each entry tagged by a type discriminator (local or remote). PostHog MCP is registered as a remote entry so OpenCode's native OAuth handling (and not subprocess mcp-remote) talks to mcp.posthog.com — matching the pattern Sentry uses in OpenCode's docs. - Add OpenCodeMCPClient (extends DefaultMCPClient): mcp property, type: remote server config via getNativeHTTPServerConfig, XDG_CONFIG_HOME honoured on Linux, supported on darwin/linux/win32. - Wire OpenCodeMCPClient into getSupportedClients alongside the other registered clients. - Add a zod schema for the OpenCode config shape (local + remote variants) to mirror the existing per-client schema convention. - Tests cover add/remove/idempotency, local/posthog-local naming, OAuth vs apiKey modes, sibling preservation, and isServerInstalled detection under the mcp key. Refs: PostHog#729 Schema source: https://opencode.ai/docs/mcp-servers
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Fixes #729
Summary
mcpkey usingtype: remote.~/.config/opencode/opencode.jsonfallback.Verification
node_modules\.bin\vitest.cmd run src/steps/add-mcp-server-to-clients/clients/__tests__/opencode.test.tsgit diff --check main...HEADRisk
Low. This adds a new client target following the existing MCP client pattern.