stack/agents/dewey/work/queue-131/r2/MUTANTS.md

Row 131 mutants (round 2)

One fault per check. mutants.py makes each edit to the candidate, runs only the listed test files with node --test in its own process group (whole-group kill at 300 s), records the result and restores the file. mutants.py --dry checks that each mutation site matches. Per-mutant output is in mutants/<id>.log; mutants/results.json holds every result. Run: 2026-10-15T16:42:28Z to 16:42:52Z, in the slot Sage gave in sage-0316.

Control

Before any mutant, each distinct test set runs on the unmutated candidate; one failure stops the run (round 2, sage-0314). Logs: mutants/control-*.log, mutants/control.json.

Control	Test files	Exit	Tests	Pass	Fail	Skipped
control-01	plugins/tests/kinds.test.mjs, plugins/tests/loader.test.mjs	0	21	21	0	0
control-02	plugins/tests/kinds.test.mjs	0	5	5	0	0
control-03	plugins/tests/loader.test.mjs	0	16	16	0	0
control-04	business/tests/plugin-settings.test.mjs, plugins/tests/loader.test.mjs	0	20	20	0	0
control-05	business/tests/plugin-settings.test.mjs	0	4	4	0	0
control-06	cli/tests/stack-copy.test.mjs	0	12	12	0	0

All pass with 0 skipped, so the chmod tests (run as a normal user) ran.

Mutants

Result: 47 of 47 cases run; 47 KILLED, 0 SURVIVED, 0 TIMEOUT.

Mutant	Check	Result	Test files	First failing test
01-name-pattern	kinds: names must match ^[a-z][a-z0-9-]*$	KILLED (exit 1)	plugins/tests/kinds.test.mjs, plugins/tests/loader.test.mjs	REQ-PLUG-1 checkPlugins refuses bad shapes, unknown kinds, bad names and duplicates
02-list-cardinality	kinds: a list kind refuses a non-list	KILLED (exit 1)	plugins/tests/kinds.test.mjs, plugins/tests/loader.test.mjs	REQ-PLUG-1 the setting's shape: unknown kinds refuse alone, a bad whole setting keeps everything
03-one-cardinality	kinds: a one-module kind refuses a non-string	KILLED (exit 1)	plugins/tests/kinds.test.mjs	REQ-PLUG-1 a kind that switches on one module takes one name, not a list
04-no-duplicates	kinds: a name twice refuses	KILLED (exit 1)	plugins/tests/kinds.test.mjs, plugins/tests/loader.test.mjs	REQ-PLUG-1 checkPlugins refuses bad shapes, unknown kinds, bad names and duplicates
05-known-kind	kinds: an unknown kind refuses	KILLED (exit 1)	plugins/tests/kinds.test.mjs	REQ-PLUG-1 checkPlugins refuses bad shapes, unknown kinds, bad names and duplicates
06-plugins-object	kinds: plugins must be a non-array object	KILLED (exit 1)	plugins/tests/kinds.test.mjs	REQ-PLUG-1 checkPlugins refuses bad shapes, unknown kinds, bad names and duplicates
07-registry-exports	registry: limit-check exports mayLaunch and mustStop	KILLED (exit 1)	plugins/tests/kinds.test.mjs, plugins/tests/loader.test.mjs	REQ-PLUG-1 REQ-LIMIT-4 the registry: usage-source and limit-check at interface version 1, each a list
08-registry-version	registry: usage-source is interface version 1	KILLED (exit 1)	plugins/tests/kinds.test.mjs, plugins/tests/loader.test.mjs	REQ-PLUG-1 REQ-LIMIT-4 the registry: usage-source and limit-check at interface version 1, each a list
09-missing-directory	loader: an absent path refuses as missing	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a missing module directory or index.mjs refuses and keeps the old setting
10-component-type	loader: a component of the wrong type refuses	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a missing module directory or index.mjs refuses and keeps the old setting
11-symlink-test	loader: a symlinked component refuses	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a symlinked module directory or index.mjs refuses and keeps the old setting
12-plugins-dir-checked	loader: packages/plugins is checked	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a symlinked packages/plugins refuses (run with --preserve-symlinks so the path keeps it)
13-kind-dir-checked	loader: is checked	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a symlinked kind directory refuses and keeps the old setting
14-name-dir-checked	loader: is checked	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a missing module directory or index.mjs refuses and keeps the old setting
15-index-checked	loader: index.mjs is checked	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a missing module directory or index.mjs refuses and keeps the old setting
16-realpath-before-import	loader: realpath(index.mjs) equals the expected path just before import	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 index.mjs swapped for a symlink after the lstat checks refuses at the realpath check
17-load-failure	loader: a module that fails to load refuses	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a module that fails to load refuses and keeps the old setting
18-export-present	loader: every export is present	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a missing export refuses and keeps the old setting
19-export-function	loader: the kind's exports are functions	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a missing export refuses and keeps the old setting
20-interface-version	loader: interfaceVersion must equal the kind's	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a different interface version refuses and keeps the old setting
21-version-strict	loader: the version comparison is strict (string "1" refuses)	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a different interface version refuses and keeps the old setting
22-keep-old-setting	loader: a refusal keeps the last good modules	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a missing module directory or index.mjs refuses and keeps the old setting
23-first-load-nothing-on	loader: a kind refused on first load has nothing on	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a kind refused on its first load has nothing switched on, and the log names kind and name
24-refusal-logged	loader: every refusal calls log	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a name not matching ^[a-z][a-z0-9-]*$ refuses and keeps the old setting
25-log-names-module	loader: the log names the refused module	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a name not matching ^[a-z][a-z0-9-]*$ refuses and keeps the old setting
26-log-kept	loader: the log says what stays on	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a name not matching ^[a-z][a-z0-9-]*$ refuses and keeps the old setting
27-whole-setting-object	loader: an array setting refuses every kind	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 the setting's shape: unknown kinds refuse alone, a bad whole setting keeps everything
28-unknown-kind-logged	loader: an unknown kind refuses and is logged	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 the setting's shape: unknown kinds refuse alone, a bad whole setting keeps everything
29-absent-key-off	loader: an absent key switches the kind off	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a path that becomes unreadable after the lstat checks refuses at either realpath
30-loads-serialized	loader: loads run one at a time	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 loads run one at a time, so the last requested setting wins
31-log-required	loader: createLoader needs a log callback	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 the loader needs a log callback
32-schema-key	schema: plugins is an allowed top-level key	KILLED (exit 1)	business/tests/plugin-settings.test.mjs, plugins/tests/loader.test.mjs	REQ-PLUG-1 schema: plugins is optional, names known kinds and checked module names
33-schema-check	schema: plugins is checked with checkPlugins	KILLED (exit 1)	business/tests/plugin-settings.test.mjs	REQ-PLUG-1 schema: plugins is optional, names known kinds and checked module names
34-schema-returned	schema: plugins is returned	KILLED (exit 1)	business/tests/plugin-settings.test.mjs, plugins/tests/loader.test.mjs	REQ-PLUG-1 schema: plugins is optional, names known kinds and checked module names
35-schema-copy	schema: the returned value is a frozen copy, the document stays mutable	KILLED (exit 1)	business/tests/plugin-settings.test.mjs	REQ-PLUG-1 schema: plugins is optional, names known kinds and checked module names
36-setter-strict-keys	setter: only revision and plugins are accepted	KILLED (exit 1)	business/tests/plugin-settings.test.mjs	REQ-PLUG-1 REQ-ROLE-3 a refused setter write throws a code, changes nothing and logs nothing
37-setter-revision-format	setter: revision must be 64 hex	KILLED (exit 1)	business/tests/plugin-settings.test.mjs	REQ-PLUG-1 REQ-ROLE-3 a refused setter write throws a code, changes nothing and logs nothing
38-setter-checks-names	setter: plugins is checked before the writer runs	KILLED (exit 1)	business/tests/plugin-settings.test.mjs	REQ-PLUG-1 REQ-ROLE-3 a refused setter write throws a code, changes nothing and logs nothing
39-setter-actor-logged	setter: the actor is logged	KILLED (exit 1)	business/tests/plugin-settings.test.mjs	REQ-PLUG-1 REQ-ROLE-3 the setter writes plugins through the organization writer and logs old and new names
40-setter-writes-plugins	setter: plugins is written	KILLED (exit 1)	business/tests/plugin-settings.test.mjs	REQ-PLUG-1 REQ-ROLE-3 the setter writes plugins through the organization writer and logs old and new names
41-copy-ships-plugins	stack-copy: packages/plugins ships in the pinned copy	KILLED (exit 1)	cli/tests/stack-copy.test.mjs	shared copy: npm ci, pushed reachability, readonly/existing copy, webui delegation
42-modules-known-kind	loader: modules() refuses an unknown kind	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 the setting's shape: unknown kinds refuse alone, a bad whole setting keeps everything
43-unreadable-refused	loader: a read error other than ENOENT/ENOTDIR refuses as unreadable	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a path that can't be read refuses as unreadable, is logged and keeps the old setting
44-realpath-index-mapped	loader: realpath(index.mjs) errors become refusals	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a path that becomes unreadable after the lstat checks refuses at either realpath
45-realpath-root-mapped	loader: realpath(packages/plugins) errors become refusals	KILLED (exit 1)	plugins/tests/loader.test.mjs	REQ-PLUG-1 a path that becomes unreadable after the lstat checks refuses at either realpath
46-setter-plain-prototype	setter: plugins must have prototype Object.prototype or null	KILLED (exit 1)	business/tests/plugin-settings.test.mjs	REQ-PLUG-1 REQ-ROLE-3 a refused setter write throws a code, changes nothing and logs nothing
47-writer-checks-bytes	writer: validates JSON.parse of the bytes it writes	KILLED (exit 1)	business/tests/plugin-settings.test.mjs	REQ-PLUG-1 REQ-ROLE-3 the writer checks the bytes it writes: a Date in plugins is refused there too

New in round 2: 43, 44 and 45 (F2), 46 (F1a), 47 (F1b). 43 to 45 fail because load() rejects on the raw EACCES instead of logging a refusal; 46 lets a Date through the setter, written as a date string; 47 lets the writer take a Date without a BusinessError. Mutant 09 now sits in the shared fsCall helper: without the ENOENT mapping a missing path refuses as unreadable, not missing. Mutant 17's log shows a SyntaxError: it is the fixture module's deliberate syntax error, which the mutant rethrows instead of refusing. changes(old, written) has no mutant; see BUILD.md, round 2.