rust(feat): add Cursor and OpenCode agent support - #705
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Overall looks solid, my main concern is that a lot of this is specific to 4 known harnesses. How do we expect this to handle other coding harnesses, or do we just want to accept that these are the handful we support and can validate?
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Extend the agent lifecycle to the two clients that keep MCP registrations in their own JSON config rather than behind a CLI. Cursor uses `~/.cursor/mcp.json` under `mcpServers`; OpenCode uses `~/.config/opencode/opencode.json` under `mcp` with a local command array. Both join Codex on the shared `~/.agents/skills/sift` skill directory. Merge into the existing config instead of rewriting it, so unrelated servers and top-level settings survive. Writes go through a temp file and rename, and permissions are carried over, so an interrupted write cannot truncate a user's config. Refuse to follow a symlinked config or skill directory. An entry carrying keys this CLI does not write is reported as a conflict rather than overwritten, and an OpenCode `opencode.jsonc` is reported as unavailable because comments would not survive a rewrite. Detect these two clients by config directory as well as PATH, since both are commonly installed as editors without a CLI on PATH. Snapshot every client's prior config before the first write so a failure partway through a multi-client install restores all of them plus the skill directories. These are the tests that cover the cross-client transaction; the JSON clients can be driven directly, without a fake process runner. Generalize the skill-target test now that three clients share one directory.
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Changes
Extends the agent lifecycle to the two clients that keep MCP registrations in their own JSON config rather than behind a CLI. Cursor uses
~/.cursor/mcp.jsonundermcpServers; OpenCode uses~/.config/opencode/opencode.jsonundermcpwith a local command array. Both join Codex on the shared~/.agents/skills/siftdirectory.Merges into the existing config instead of rewriting it, so unrelated servers and top-level settings survive. Writes go through a temp file and rename with permissions carried over, so an interrupted write cannot truncate a user's config. Refuses to follow a symlinked config or skill directory. An entry carrying keys this CLI does not write is a conflict rather than something to overwrite, and an OpenCode
opencode.jsoncis reported as unavailable because comments would not survive a rewrite.Detects these two clients by config directory as well as
PATH, since both are commonly installed as editors with no CLI onPATH.Snapshots every client's prior config before the first write, so a failure partway through a multi-client install restores all of them plus the skill directories.
Verification
cargo fmt --check --all,cargo clippy --all-features,cargo test --all-featurescmd::agenttests, including the cross-client rollback and preflight cases this PR makes testable