fix(bmadconfig): resolve artifact paths from BMAD's central TOML config (#154) - #828
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WalkthroughThe change makes central four-layer BMAD TOML the primary source for artifact paths, with legacy YAML fallback for missing keys. It rejects ambiguous or invalid TOML values, updates configuration caching, revises warnings, and adds validation coverage. ChangesCentral configuration resolution
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Validate
participant load_paths
participant CentralTOML
participant LegacyYAML
Validate->>load_paths: resolve BMAD paths
load_paths->>CentralTOML: load and merge four layers
load_paths->>LegacyYAML: fill keys absent from TOML
load_paths-->>Validate: return canonical paths or bmad-config error
Suggested reviewers: Merge Risk: 🟡 Moderate · up to An invalid TOML layer can be silently ignored by the TUI cache, so cache invalidation should distinguish missing and unreadable sources before merge. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation Issue Resolution Change TOML key resolution to apply the Full details: Docstring CoverageExplanation Docstring coverage is 66.10% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 59 functions across 9 files. (3 skipped: 2 unsupported, 1 too large.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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| if not path.exists() and not path.is_symlink(): | ||
| return None |
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When a central layer is on an inaccessible directory or a transiently unavailable share, Path.exists() can raise PermissionError/OSError here before execution reaches the guarded open(). _load_layer therefore leaks an untyped exception; for example, the inspected cmd_validate path catches only BmadConfigError, and the CLI's top-level handler does the same, so validation terminates with a traceback instead of reporting a bmad-config failure. Include the metadata probes in the OSError translation used for the read.
AGENTS.md reference: AGENTS.md:L78-L81
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Valid — on 3.11–3.13 exists()/is_symlink()/is_file() raise PermissionError untyped for an unreadable layer directory, and on 3.14 they return False, so the layer silently reads as absent and the YAML fills the key. Fixed in c1ff6c6: the probes are now raw lstat/stat; only ENOENT/ENOTDIR on the entry means absent, and every other failure becomes a BmadConfigError ("cannot read …"). Regression test (ablated: fails with the old probes): test_a_layer_behind_an_unreadable_directory_refuses_typed.
load_paths now reads the four central TOML layers (_bmad/config.toml, config.user.toml, custom/config.toml, custom/config.user.toml) merged as BMAD-METHOD v6.12.0's config_utils.structural_merge does for anything a path key can observe, and resolves each key the way render_skill's _resolve_short_config does: every scalar match in the merged tree, more than one refused as ambiguous. A TOML value wins over the legacy _bmad/bmm/config.yaml for every key; the YAML fills only keys the TOML lacks, and with no TOML layer the YAML is read exactly as before. Malformed or undecodable layers, blank or non-string values and ambiguous keys raise BmadConfigError naming file and key rather than falling back.
- tui.data._project_paths stat-gates on all four central TOML layers plus the legacy config.yaml (via bmadconfig.CENTRAL_LAYERS_REL / LEGACY_CONFIG_REL), so a TOML layer edit invalidates the cached ProjectPaths in a mixed install, and a TOML-only install is cached at all (it was reloaded on every call — a missed cache, not wrong paths). - bmadconfig._load_layer refuses a layer path that is a symlink resolving to no file (dangling or looping) instead of reading it as absent and letting the YAML fill the key; a symlink to a real file still loads. - The code-root-moved warnings in cli and runs name "the BMAD config" and `repo_root`, since the key can now come from a TOML layer. - Rewrap the #769 CHANGELOG entry to the file's ~88-column width.
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Inline comments:
In `@src/bmad_loop/tui/data.py`:
- Line 761: Update the source-signature logic around _stat_sig and config_sigs
so an absent source is distinguishable from a stat failure, using lstat state or
an explicit error sentinel. Ensure newly dangling or looping symlinks change the
signature, invalidate cached ProjectPaths, and allow load_paths() to raise
BmadConfigError.
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CHANGELOG.mddocs/FEATURES.mdsrc/bmad_loop/bmadconfig.pysrc/bmad_loop/cli.pysrc/bmad_loop/runs.pysrc/bmad_loop/tui/data.pytests/conftest.pytests/test_bmadconfig.pytests/test_cli.pytests/test_runs.pytests/test_tui_app.pytests/test_tui_data.py
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| hit = _central_value(central, key) | ||
| if hit is not None: | ||
| return hit |
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When central TOML overrides implementation_artifacts while the legacy YAML still names the old directory, this branch makes the orchestrator select and update the TOML ledger, but the canonical src/bmad_loop/data/skills/bmad-loop-sweep/SKILL.md:32-33 still instructs the triage agent to resolve the ledger only from YAML, and sweep.py:4025-4043 passes no resolved path in the prompt. The agent can therefore classify stale or unrelated entries; if IDs overlap, its otherwise-valid result may close or bundle entries in the current ledger using evidence from the old one. Pass the resolved ledger path to the session or update the canonical skill to follow the same layered lookup.
AGENTS.md reference: AGENTS.md:L31-L31
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Valid, and it goes further: on a TOML-only install (the #769 layout, no _bmad/bmm/) the skill could not find a ledger at all. Fixed in f713459: SweepEngine._extra_session_env exports BMAD_LOOP_LEDGER (the resolved workspace.paths.deferred_work) to triage and migration sessions, and SKILL.md step 1 and migration-mode.md now read that path instead of re-deriving it (the YAML lookup stays only as a fallback when the variable is empty). Bundle sessions are unchanged. Test: test_triage_session_reads_the_ledger_load_paths_resolved (ablated).
| if legacy is None: | ||
| legacy = _load_legacy(config_path) if config_path.is_file() else {} | ||
| raw = legacy.get(key) |
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On Python 3.11–3.13, when a central config omits any path key and _bmad/bmm is inaccessible, this newly added is_file() probe raises PermissionError before _load_legacy; cmd_validate catches only BmadConfigError, so validate --json falls through to the generic top-level handler and emits no contract JSON. On Python 3.14+, the same probe can report false and misdiagnose an unreadable YAML fallback as a missing key. Although the central-layer probes are now guarded, this fallback probe needs the same typed OSError handling.
AGENTS.md reference: AGENTS.md:L32-L32
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Valid. Fixed in f713459: both legacy config_path.is_file() probes go through _legacy_is_file, which keeps is_file()'s answer for a missing entry or a dangling/looping link and raises BmadConfigError("cannot read …") for any other failure. Test: test_an_unreadable_legacy_directory_refuses_typed[mixed|yaml-only] (ablated).
| config_sigs = tuple(_stat_sig(project / rel) for rel in sources) | ||
| cached_paths = _paths_cache.get(project) | ||
| if config_sig is not None and cached_paths is not None and cached_paths[0] == config_sig: | ||
| if cached_paths is not None and cached_paths[0] == config_sigs: | ||
| return cached_paths[1] |
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If the TUI has cached valid paths while a layer is absent and the operator then creates a dangling or looping symlink at that layer path, _stat_sig() follows the link and returns None on the resulting OSError, which is identical to the previous missing-layer signature. This equality check therefore returns the cached paths without calling load_paths, bypassing the new explicit refusal for a present broken layer and leaving the dashboard on stale artifact locations indefinitely. Use an lstat-aware signature or distinct missing/error sentinels for config sources.
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Valid: the cache signature folded "absent" and "present but unresolvable" into the same None. Fixed in f713459: config sources are signed by _config_source_sig, which uses lstat (plus the followed stat) and signs access errors separately, so a link appearing at an absent layer invalidates the cache. Test: test_project_paths_invalidates_when_a_dangling_link_appears_at_an_absent_layer (ablated).
…cy probe; lstat-aware TUI config cache (#769)
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Closes #154.
Refs #769, #768.
Summary
load_pathsnow reads the four central TOML layers (_bmad/config.toml,config.user.toml,custom/config.toml,custom/config.user.toml). It merges them the way BMAD-METHOD v6.12.0'sconfig_utils.structural_mergedoes, for everything a path key can see. It resolves each key the wayrender_skill's_resolve_short_configdoes: it looks at every scalar match in the merged tree and refuses more than one as ambiguous. A TOML value wins over the legacy_bmad/bmm/config.yamlfor every key. The YAML fills only keys the TOML lacks, and with no TOML layer the YAML is read exactly as before. A malformed or undecodable layer, a blank or non-string value, or an ambiguous key raisesBmadConfigErrornaming the file and key, rather than falling back._project_pathscache now checks the timestamps of all four TOML layers plus the legacy YAML. A TOML edit therefore invalidates the cached paths, and a TOML-only install is cached at all.bmadconfig._load_layerrefuses a layer path that is a dangling or looping symlink, instead of treating it as absent and letting the YAML fill the key. The code-root-moved warnings incliandrunsnow name "the BMAD config" andrepo_root, because the key can now come from a TOML layer.Notes for reviewers
bmad setuprun. The fixture is derived from v6.12.0'smanifest-generator.js._bmad/config.tomland_bmad/bmm/config.yaml. The [BUG] bmad-loop 0.11.1 validate fails against abmad setup(BMAD 6.12) install #769 report also covers a missing-skills symptom: a TOML-only install (the 6.13-next plugins, [BUG] validate/run blocked on BMAD-METHOD 6.13: skills moved to Claude Code plugins, and two required review skills no longer exist #768) still fails the skills preflight. That symptom is out of scope here and remains with [BUG] validate/run blocked on BMAD-METHOD 6.13: skills moved to Claude Code plugins, and two required review skills no longer exist #768.Stack
Part of a stack; merge bottom-up. This is layer 3 of 8, on top of #827.
Stack order (bottom → top): #826 → #827 → #828 → #829 → #830 → #831 → #832 → #833.
Summary by CodeRabbit
New Features
Bug Fixes