Routing the CLI's writes through `file_access` changed what happens when the
output path is a symbolic link. `file_access::write` stages the bytes and
renames them into place, and a rename replaces the link with a regular file,
where `std::fs::write` followed it and wrote to its target. A render to a link
reported success while the target kept its old contents.
Unconfined writes go back to `std::fs::write`. Confined ones keep the staged
write, which is right there: `Roots::check` resolves the path first and has
already refused a link leading out of the root, so the write lands on the
resolved target inside it.
`figcraft-cli mcp` takes `--automation-read-root` / `--automation-write-root`
to confine the files an agent's commands touch, but the file subcommands took
neither: `figcraft-cli run script.json --out /anywhere/x.figcraft` read and
wrote as the user who started it. The README invites agent use, and a script
or agent driving `run`, `export` or `convert` had no way to say which folders
it may reach (#833).
`info`, `export`, `convert`, `render` and `run` take the same two flags, with
the same semantics: repeatable, the folders must exist, reads inside a read or
write root, writes only inside a write root, everything else refused -- so
giving no write root denies writing altogether. Without the flags they behave
as before.
The flags would have been decorative on their own: `figcraft_engine` enforces
roots through `file_access`, which the engine's own loads already go through,
but the CLI wrote its output with `std::fs` and read its script the same way.
Those three calls now go through `file_access` too, so the confinement reaches
the files the CLI itself touches.
- `figcraft-cli mcp --automation-read-root DIR --automation-write-root DIR` (each repeatable, `--flag=DIR` works too). When either is given, every file an agent's tool call reads must lie inside a read root or a write root, and every file it writes inside a write root. Anything else is an ordinary tool error (`automation path rejected: … is outside the folders that may be written: …`); nothing is written and the server keeps serving. Without the flags nothing changes.
- The desktop app takes the same flags (`figcraft --control PORT --automation-read-root DIR …`) and confines every control request and every frame of every window to them, so `figcraft-cli mcp --attach` drives a confined app. `--attach` together with the flags is a usage error, because the app runs the commands and only the app can confine them.
- New engine module `crates/engine/src/file_access.rs`: `Roots` (resolution and comparison), a thread-scoped `confined(roots, f)`, and the file primitives (`read`, `read_capped`, `open`, `metadata`, `read_dir`, `write` (atomic), `create_dir_all`, `exists`, `is_dir`). Every engine file access now goes through it. `crates/engine/clippy.toml` denies `std::fs::*`, `File::open/create`, `OpenOptions::open`, `Path::exists/is_file/is_dir/metadata/read_dir/canonicalize` and `figcraft_format::{write_file_atomic, save_file, load_file}` everywhere else in the engine, so a command added later is confined without a check of its own.
- `ui.screenshot` and `ui.render` return the PNG as base64 `data` when no `path` is given (before, `ui.screenshot` wrote `figcraft-screenshot.png` in the working directory and `ui.render` required a path). The attached MCP backend uses that, so it no longer writes and deletes temporary PNGs, and a confined app needs no exemption for them.
- `initialize`'s `instructions` name the folders the agent may read and write.
- `figcraft-cli` options may be given more than once (`Args::values`); single-valued options keep the last value, as before.
- Docs: `docs/mcp.md` › Confining file access (options, semantics, coverage, resolution, limits), `docs/control-protocol.md` › Confining file access and the optional `path` of `ui.screenshot` / `ui.render`, `docs/cli.md`, `figcraft-cli --help`, and the Automation line plus a revision row in `docs/target-app-parity.md`.
Fixes#715, fixes#481.
`{"type":"linearGradient","stops":["#hex",…]}` was only expanded by the MCP
tools, so `figcraft-cli run` and the control channel's `engine.execute`
refused it ("`fills` must be paints or colours"). The expansion now lives in
the engine (`params::normalize_paint`, used by `paint_of`), so node.set,
node.create props, fill.add/set, strokes and paint styles all take it; MCP
calls the engine's copy instead of its own.
Tests: engine (every paint command, MCP-equal defaults, junk still refused),
control channel `engine.execute`, and `figcraft-cli run` end to end.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Hamza