feat: post-login MCP hints and butter mcp install (#7) - #9
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After a successful `butter auth login`, print how to connect an AI client to the ButterStack MCP server (Claude Code, OpenCode, the new auto-configurator, and the docs link). The block is skipped under --json. Add `butter mcp install [--opencode] [--claude] [--cursor] [--dry-run]`, which writes the `butterstack` entry into each client's config in that client's own schema. With no flag it configures every client whose config directory exists; a flag limits the install to that client and creates its file if missing. Only the `butterstack` key is written, an already-correct entry is left alone, and a stale one is replaced with the old value printed. OpenCode configs are JSONC, so a small string-aware parser strips comments and trailing commas before JSON.parse. A file that contains comments is never rewritten: the command prints the entry to paste and the file path instead. `butter mcp` alone prints the MCP help.
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Closes #7. Both steps.
Post-login hints. After a successful
butter auth login, print a short block with the Claude Code and OpenCode commands,butter mcp install, and the docs link. Suppressed under--json.butter mcp install [--opencode] [--claude] [--cursor] [--dry-run]. Writes thebutterstackMCP entry into each detected client's config in that client's own schema. Idempotent: only thebutterstackentry is ever touched, an already-correct entry is left alone, and a second run leaves the file byte-for-byte unchanged. Config files that contain comments are never rewritten (that would drop the comments); the command prints the entry and the path to paste it into instead. Unparseable or wrong-typed configs are reported and skipped without being modified.Still zero dependencies: a small JSONC reader (comments and trailing commas outside strings, BOM) lives in
bin/butter.Decisions on the issue's open questions:
claude mcp addcommand.mcp.jsonyet is still picked up. No client found exits 1 and suggests the flags.%APPDATA%and are coded but untested.README documents the command. 9 new tests, all under a temp HOME.