[N3MI-DG]

Change

A body's print face is the flat face that an STL, 3MF or slicer export lays on the print bed (body.print_face). Before this PR, no command could only read print faces. body.print_face sets or clears one, and an export reports print faces only after it writes a file. So a plugin with a read entry, or an MCP client, could not check whether bodies are ready to print.

This PR adds body.print_faces {bodies?: [names]}, which is read-only and adds no undo step. For each body (every body when bodies is left out), it reports:

• set: the body has a print face, and an export lays the body on it. face gives the face's persistent name.
• none: the body has no print face, so an export writes it as it lies.
• lost: a face was marked, but a later feature cut it away or it is no longer flat. problem says why. The command uses the same lookup as the exports, so it agrees with what an export would do.

all_set is true when at least one body was checked and every one is set. With no bodies, all_set is false, so an empty selection never passes. An unknown body name or a malformed bodies value is refused with a message that names it.

Example use: a plugin entry that checks "every selected body has a print face" before sending to a slicer.

Changes a default: no

Validation

I ran a release build and drove the app over the control channel:

Step	Reply
Two boxes, nothing marked	Block: none, Spacer: none, all_set: false
Marked Block's top face	Block: set (F1:+z), Spacer: none, all_set: false
bodies: ["Block"]	Block only, all_set: true
Undo depth before and after two checks	3 and 3
Marked Spacer's bottom face; bodies: ["Spacer", "Block"]	both set, in the order asked, all_set: true
Cut the top 2 mm off Block	Block: lost, problem: "the +z side of Box1 on Block no longer exists"; Spacer set; all_set: false
bodies: ["Bracket"]	refused: no body Bracket``
bodies: 3	refused: `bodies` must be a list of names; it is 3

New tests sit in the existing print-face test module (crates/engine/src/cmd/print_face.rs), and the input-schema key check is in crates/engine/src/schema/print_face.rs.

cargo test --profile ci -p solidcraft-engine --lib print_face -- --test-threads=1: 28 passed, 0 failed. The run covers the three new tests, the updated schema key check, and the 24 existing print-face tests:

• print_faces_says_which_bodies_have_one_and_changes_nothing
• print_faces_reports_a_face_that_was_cut_away_as_lost
• print_faces_refuses_an_unknown_body_or_a_bad_list_and_is_false_with_no_bodies
• schemas_and_the_key_check_agree (now also checks body.print_faces)

Those results are for the first commit. The second commit (d76a9e8) makes bodies accept one name under strict parameter checks and adds print_faces_takes_one_name_as_a_list_of_one_with_strict_checks_too. I couldn't run its tests here because the test build ran out of memory, so CI runs them first.

I left the rest of the suite and cargo xtask ci to CI.

Screenshots of the behavior (when observable)

None: the command has no button or panel, and its only output is the JSON reply shown above.

Integration status

Branched from origin/main at d20e582. Open PR #13906 also edits crates/engine/src/cmd/print_face.rs, but only to make bed_matrix pub(super), so the two don't conflict.

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Added a read-only command to check print-face status for selected bodies or all bodies. Results show whether each body has no print face, a set face, or a lost face, with details when applicable.
  • The check reports whether all checked bodies have print faces and flags invalid body selections or unknown body names.
  • Added the English command label “Check Print Faces.”

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Walkthrough

Adds the read-only body.print_faces command. It reports print-face status for selected bodies or all bodies, with result types for status details and whether all checked bodies have a face set.

Changes: Print-face status check

Layer / File(s)	Summary
Print-face result contract crates/engine/src/schema/print_face.rs	Adds parameter and result types for body print-face statuses, including optional face and problem details. The schema test checks the bodies input key.
Command registration and status checks crates/engine/src/cmd/print_face.rs, assets/locales/pending/print-faces-check.json	Registers and implements body.print_faces as a read-only, no-undo command. It checks selected bodies or all bodies, reports their status, and rejects invalid lists or unknown names. Tests cover results, errors, and unchanged state and undo history. Adds the English command label.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: Low · previous review bd19f

This adds a read-only print-face status check with limited blast radius. Two small items remain before merge: a scalar string for bodies is accepted although the command expects a list, and the new locale file lacks its attribution row, which can fail the asset check.

Security architecture risk: Minimal · up to bd19f

The new query uses existing document access and print-face resolution. No introduced security risk or material weakening of state ownership, failure containment, or recovery guarantees was identified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The added disclosure surface is print-face metadata for selected bodies or every body in the caller's current session world. The inspected handler provides no cross-document selector or additional filesystem authority.

Trust Boundaries and Controls

• observed — The new command is classified read-only. Plugin dispatch checks that the command is granted, checks any required command group, and rejects non-read commands from read entries. Existing read-only commands already expose body geometry, providing counterevidence to a newly introduced document-read authority class.

Resilience and Maintainability Implications

• observed — The query can populate the existing shared world cache. On normal success or error returns, world_state restores the reusable placement map before caching the outcome. The handler adds no independent reservation, persistent transition, or cleanup obligation.

Pre-merge checks: 5

Check name	Status	Explanation
Title check		The title names the main change: a read-only command that reports which bodies have a print face. It matches the command described in the summary and objectives, and it does not overstate the scope.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Description check		The description covers the change in plain terms: a read-only body.print_faces command that reports set, none, or lost print-face status per body, with all_set semantics and error handling. It explain…
Existing Defaults Unchanged		The PR's own changes (d20e582..HEAD, commits bd19f89 and d76a9e8) are additive. I compared the diff against the stated base and found no UX default changed. - `assets/locales/pending/print-faces-ch…

Full details: Description check

Explanation

The description covers the change in plain terms: a read-only body.print_faces command that reports set, none, or lost print-face status per body, with all_set semantics and error handling. It explains the problem (no read-only way to check print readiness) and gives an example use. It includes a Changes a default line set to no. Validation is thorough: a manual control-channel run table, the test command with results, and tests named by function. The second commit's tests were not run, and the author states this and defers to CI. The screenshot section is present and explains why none applies, which fits the template since the command has no UI. The template asks for a title that tells a user what changes. The title was not part of the supplied description, so it is not assessed here. No issue link is given, and the template only says to link one when applicable. A reviewer would still need to know the second commit's tests are unverified, but the author disclosed this clearly.

Full details: Existing Defaults Unchanged

Explanation

The PR's own changes (d20e582..HEAD, commits bd19f89 and d76a9e8) are additive. I compared the diff against the stated base and found no UX default changed. - assets/locales/pending/print-faces-check.json is a new file. It adds only the label cmd.body.print_faces = "Check Print Faces". - crates/engine/src/cmd/print_face.rs: the only removed lines are the existing body.print_face CommandSpec, which is re-wrapped onto multiple lines. Its name, icon, key (Ctrl+B), contract, output and params text are unchanged. A new body.print_faces CommandSpec is added. It is read-only, is .noundo(), and has no key binding. Its .params text is new. - crates/engine/src/schema/print_face.rs: adds PrintFacesParams, PrintFaceStatus, BodyPrintFace and PrintFacesResult. The existing PrintFaceParams and PrintFaceResult are untouched. The new PrintFacesParams.bodies uses StringList, which is a new command's input contract, not a change to an existing one. - The test edits only add tests and a key check for the new command. The CodeRabbit threads concern attribution rows and scalar-string validation for the new command's input. Neither changes an existing user-facing default. The PR description's "Changes a default: no" matches the code. The bodies parameter behaviour is new, so it does not alter any existing default.

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Actionable comments posted: 2

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• Fix comments: Fix CodeRabbit comments on this PR

Prompt to fix all issues

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @assets/locales/pending/print-faces-check.json:
- Line 3: Add the missing attribution row for the locale asset identified by the
`cmd.body.print_faces` key, using the exact row format from existing attribution
entries and associating it with the correct asset. Keep the change limited to
the attribution entry.

Review comments at @crates/engine/src/cmd/print_face.rs:
- Line 42: Validate the supplied non-null bodies parameter as an array before
calling string_list; reject scalar strings while preserving the existing
behavior for omitted or null values. Add a test confirming that a scalar string
for bodies is rejected.

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Commits

Reviewing files that changed from the base of the PR and between d20e582 and bd19f89.

Files selected for processing: 3

• assets/locales/pending/print-faces-check.json
• crates/engine/src/cmd/print_face.rs
• crates/engine/src/schema/print_face.rs

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[bherbruck]

Thanks, this read-only command is useful for plugins. Two checks fail on this head. 1) The i18n check wants cmd.body.print_faces translated in the complete catalogs (ar, he, ja, vi, zh). Please add those to assets/locales/pending/print-faces-check.json. 2) "Build the CLI" fails on kernel-cases coverage: NO CASE: body.print_faces. Please add a line to tests/kernel-cases/EXEMPT naming where the command is tested.

[N3MI-DG]

Thanks. Both are fixed in ce991a2:

1. assets/locales/pending/print-faces-check.json now has cmd.body.print_faces in ar, he, ja, vi and zh. Each one uses the words that catalog already has for "check" and for "print face".
2. tests/kernel-cases/EXEMPT has a body.print_faces line, in sorted order, that points to the tests in crates/engine/src/cmd/print_face.rs.

[bherbruck]

@Nathan-Dane could you review this one when you get a chance? It adds a command (Check Print Faces) that shows up in the command list, so it needs your eye before it can merge.