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fix(adapters): quote YAML scalars in OpenCode and Copilot frontmatter - #700
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wshobson merged 2 commits intoSep 13, 2026
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`_opencode_frontmatter` (tools/adapters/opencode.py:132) writes every scalar bare, and `_copilot_frontmatter` (tools/adapters/copilot.py:32) quotes only pure numbers and lowercase reserved words via `_needs_yaml_quoting`. Source frontmatter that is correctly quoted therefore loses its quotes on the way out: `description: "Manage track lifecycle: archive, restore"` becomes `description: Manage track lifecycle: archive, restore`, which PyYAML rejects, and `argument-hint: "[--archive | --list]"` becomes a bare `[...]` that parses as a list instead of a string. Copilot also stringified mapping-valued fields as a Python dict repr because it had no dict branch. Generating every plugin from main and running `yaml.safe_load` over the frontmatter: OpenCode emits 8 unparseable and 12 mistyped blocks, Copilot 30 and 24. Codex and Antigravity emit none, because both already route scalars through a private `_yaml_scalar` helper that is duplicated verbatim between them. Move that helper to tools/adapters/base.py as `yaml_scalar`, import it in all four adapters, and give Copilot the dict branch Antigravity already has. Codex and Antigravity output is byte identical before and after; OpenCode and Copilot drop to zero unparseable and zero mistyped. Adds a `TestFrontmatterYamlSafety` class that parses emitted frontmatter with PyYAML rather than the repo's tolerant `parse_frontmatter`, which is what let this through the existing validators.
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📝 SummarySummary by CodeRabbit
WalkthroughChangesThe PR adds shared conservative YAML scalar rendering and replaces adapter-specific quoting logic in Antigravity, Codex, Copilot, and OpenCode. Tests use PyYAML to validate scalar round trips, parseable frontmatter, and nested mappings. YAML frontmatter serialization
Estimated code review effort: 3 (Moderate) | ~20 minutes Sequence Diagram(s)sequenceDiagram
participant Adapter
participant yaml_scalar
participant PyYAML
Adapter->>yaml_scalar: Render frontmatter values
yaml_scalar-->>Adapter: Return YAML-safe scalar text
Adapter->>PyYAML: Emit frontmatter
PyYAML-->>Adapter: Parse emitted YAML
Suggested reviewers: Merge Risk: 🟡 Moderate · up to The frontmatter changes are not yet merge-ready: some valid Antigravity values can produce invalid YAML, and numeric-looking strings can change type across all adapters. The ineffective Antigravity regression test also leaves that failure path uncovered. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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In `@tools/adapters/antigravity.py`:
- Line 68: Update the delimiter condition in the relevant scalar-formatting
logic to also detect “[”, “{”, and “}”, ensuring values containing any
flow-sequence or flow-mapping delimiter are quoted before emission.
In `@tools/adapters/base.py`:
- Line 315: Update yaml_scalar to quote implicit numeric scalar forms such as
+1, .nan, and .inf, ensuring YAML 1.1-compatible loaders preserve them as
strings. Apply the behavior consistently to the Codex, Copilot, OpenCode, and
Antigravity frontmatter emitters, and add round-trip tests covering these
values.
In `@tools/tests/test_adapters.py`:
- Line 1502: Update the Antigravity test around _ambiguous_plugin so the fixture
creates a skill or agent that emits at least one Markdown artifact, then assert
a Markdown result exists before iterating over it for frontmatter parsing.
Preserve the existing frontmatter validation while replacing the command-only
setup that produces only TOML output.
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tools/adapters/antigravity.pytools/adapters/base.pytools/adapters/codex.pytools/adapters/copilot.pytools/adapters/opencode.pytools/tests/test_adapters.py
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tools/adapters/base.pytools/adapters/opencode.pytools/adapters/codex.pytools/adapters/copilot.pytools/tests/test_adapters.pytools/adapters/antigravity.py
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Files:
tools/adapters/base.pytools/adapters/opencode.pytools/adapters/codex.pytools/adapters/copilot.pytools/tests/test_adapters.pytools/adapters/antigravity.py
🪛 ast-grep (0.45.2)
tools/tests/test_adapters.py
[info] 1421-1421: use jsonify instead of json.dumps for JSON output
Context: json.dumps(plugin_json)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
`_yaml_flow_scalar` at tools/adapters/antigravity.py:68 quoted a flow-sequence item only when it contained `,` or `]`, and `yaml_scalar` rejects `[`, `{` and `}` only in the leading position, so a value such as `a {b` was emitted bare as `tools: [a {b]`. PyYAML raises `ParserError: while parsing a flow sequence, expected ',' or ']', but got '{'` on that line. The check now covers every character YAML treats as structural inside a flow collection: `[`, `]`, `{`, `}` and `,`. Codex, Copilot and OpenCode render lists as block sequences, where those characters are legal inside a plain scalar, so none of them needed the same widening.
`yaml_scalar` at tools/adapters/base.py:315 tested `s[:1].isdigit()` for number-likeness, which misses every implicit number that opens with `+` or `.`. Feeding the helper a table of those forms and loading the result with `yaml.safe_load` returned numbers rather than strings for twelve of them: `+1`, `+3` and `+0x1A` as ints, `+1_000` as 1000, `+1:30` as the sexagesimal int 90, `.0` and `.5` as floats, `.inf`, `.INF` and `+.inf` as float infinity, and `.nan` and `.NaN` as float not-a-number. A YAML 1.2 loader additionally reads `+.5` as a float, so a signed bare fraction is quoted too. A new `_YAML_IMPLICIT_NUMBER` pattern quotes an optional sign followed by an optional dot and a digit, or an optional sign followed by a dot and an inf or nan spelling, which reaches all four adapters at once because they share the helper. A dot or plus in front of a non-number, `.gitignore`, `.info` or `+abc`, still emits bare.
`test_antigravity_emits_parseable_frontmatter` at tools/tests/test_adapters.py:1502 filtered the emitted paths to `.md` and parsed each one, but its `_ambiguous_plugin` fixture holds a single command and Antigravity writes commands as `.toml`, so the list was always empty and the test passed without parsing any frontmatter. It now builds a one-skill plugin through a new `_ambiguous_skill_plugin` helper, asserts at least one Markdown artifact was emitted, and checks the loaded description, argument hint and version.
New round-trip tests cover the implicit numeric forms through `yaml_scalar`, the flow delimiters through the Antigravity emitter, and every hostile shape through all four frontmatter emitters as scalar, list item and mapping value at once. Each fails on the previous commit and passes here. Generating all 92 plugins for all five harnesses before and after this change gives byte identical output across 3061 files, so no content in the repository today hits either rule. `make validate STRICT=1` still reports `OK: no issues across 5 harness(es).`, `make garden` still reports `0 error(s), 18 warning(s)`, `make lint` passes ruff check, ruff format and ty, and `make test` goes from 615 to 619 passed.
Owner
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Thanks Max, this is a clean fix and the write-up made it easy to verify. I reproduced the 9 OpenCode and 31 Copilot unparseable blocks on main and got 0 with your branch. The second commit covers all three CodeRabbit findings, CI is green after workflow approval, and I filed #704 so the gardener parses generated frontmatter with a real YAML loader going forward. Merging shortly. |
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Summary
_opencode_frontmatter(tools/adapters/opencode.py:132) writes every scalar bare, and_copilot_frontmatter(tools/adapters/copilot.py:32) quotes only pure numbers and lowercase reserved words through_needs_yaml_quoting. Source frontmatter that is already correctly quoted loses its quotes on the way out, so both harnesses get files a YAML parser rejects._yaml_scalarhelper, duplicated verbatim betweencodex.pyandantigravity.py. This moves that helper intotools/adapters/base.pyasyaml_scalarand has all four adapters use it.dictbranch, so a mapping-valued field likemetadata:came out as a Python dict repr. It now emits a nested mapping, matching_antigravity_frontmatter.The bug
plugins/conductor/commands/manage.mdstarts with valid, correctly quoted YAML:make generate HARNESS=opencodeturns it into this, whichyaml.safe_loadrefuses withScannerError: mapping values are not allowed here:The second failure mode is silent. When a bracketed hint has no colon inside it, YAML accepts it as a flow sequence, so
argument-hint: "[--resume]"round-trips to the list['--resume']instead of the string[--resume].I generated every plugin for all four harnesses from
a30778fand ranyaml.safe_loadover each emitted frontmatter block:The repo's own gates do not catch it because
validate_generated.pyanddoc_gardener.pyread frontmatter withparse_frontmatter, the tolerant hand-rolled reader inbase.py, not with a YAML parser.The fix
yaml_scalarquotes a value when it is empty or pure whitespace, starts with a YAML special character, contains:or#, has leading or trailing whitespace, starts with a digit, is an implicit number led by+or.such as+1,.5,.infor.nan, or is a YAML 1.1 implicit boolean or null. Every clause except the implicit-number one is the existing Codex and Antigravity behavior, moved rather than rewritten; no value in the repo today hits the implicit-number clause, so those two adapters are unaffected and verified byte identical below.Test plan
make validate STRICT=1givesOK: no issues across 5 harness(es).make gardengives0 error(s), 18 warning(s), identical toa30778fwith the change stashed (9SKILL_OVER_CODEX_CAP, 9AGENT_BODY_DIVERGENT, all pre-existing).make testgives619 passed.make lintgives ruff checkAll checks passed!, ruff format41 files already formatted, tyAll checks passed!(withuv sync --all-extras, as the code-quality workflow does).make generate-allleaves the committed registries unchanged, so there is no drift.make smoke-test: 6 passed, 5 skipped (opencode, agy and codex are not on this machine), 1 failed intest_gh_skill_discovers_every_source_skillbecause myghdoes not acceptgh skill install . --from-local. That failure reproduces identically ona30778fwith the change stashed, so it is my GitHub CLI version, not this PR.Byte-identical output check for the two adapters I only refactored, generating every plugin before and after into separate trees:
After the change all four harnesses report 0 unparseable and 0 mistyped. The only output differences are 37 opencode files (38 lines) and 77 copilot files (81 removed, 87 added), and every one is a frontmatter value gaining quotes, a
version:like1.0.0becoming"1.0.0", or Copilot'smetadata:dict repr expanding into a nested mapping.tools/tests/test_adapters.pygains aTestFrontmatterYamlSafetyclass that parses emitted frontmatter with PyYAML instead ofparse_frontmatter, using the two real shapes above. Running that same emission through the unmodifieda30778fadapters, all four generated files raiseScannerError: copilot's SKILL.md, index.md and manage.md, and opencode'sdemo__manage.md. I replacedTestCopilotAdapter.test_yaml_quoting, which asserted on the now-deleted_needs_yaml_quoting, with ayaml_scalarcase covering everything it did plus the shapes it missed.Scope
plugins/<name>/...)tools/adapters/)Affected harnesses
Codex and Antigravity are touched but their output is unchanged.
Cross-harness portability notes
N/A, no plugin content changed.
Related issue(s)
None. This is a self-contained adapter fix with a regression test.