DEVX-61: feat: single-source-of-truth config via [tool.devx] in pyproject.toml

.gitea/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
           PYTHONPATH: src
         run: |
           . .venv/bin/activate
-          python3 -m devx.tools.check_test_speed --max-seconds 4 --max-single-seconds 0.5
+          python3 -m devx.tools.check_test_speed --max-seconds 5 --max-single-seconds 0.5
       - name: Documentation coverage check
         env:
           PYTHONPATH: src

pyproject.toml

@@ -96,6 +96,13 @@ strict = ["src/devx/config.py", "src/devx/exceptions.py", "src/devx/i18n.py", "s
 # Rule priority (first match wins):
 #   1. user_facing_overrides (safety — highest priority)
 #   2. infrastructure_overrides (explicit per-file)
+# Project-specific devx configuration (read by devx.config)
+[tool.devx]
+task_prefix = "DEVX"
+vikunja_project_id = 8
+repo_owner = "oblachno-oss"
+repo_name = "devx"
+
 #   3. infrastructure (DEFAULT_INFRASTRUCTURE + project-specific patterns)
 #   4. Default: user-facing (safe)
 [tool.devx.classify]

src/devx/config.py

@@ -1,28 +1,86 @@
 """Shared configuration constants for devx scripts and API clients.
 
-All defaults can be overridden via environment variables with the ``DEVX_``
-prefix. Projects consuming devx can set these in their ``.env`` files.
+Configuration is read from two sources, in priority order:
+
+1. **Environment variables** (``DEVX_`` prefix) — highest priority, used for
+   CI secrets and per-run overrides.
+2. **``[tool.devx]`` section in ``pyproject.toml``** — project defaults,
+   read from the current working directory.
+
+If neither source provides a value, built-in defaults are used.
 """
 
 from __future__ import annotations
 
 import os
 import re
+import tomllib
+from pathlib import Path
+
+
+def _load_pyproject_devx() -> dict[str, object]:
+    """Load the ``[tool.devx]`` section from pyproject.toml in the CWD.
+
+    Returns an empty dict if the file or section is missing.
+    """
+    path = Path("pyproject.toml")
+    if not path.exists():
+        return {}
+    try:
+        with open(path, "rb") as f:  # noqa: PTH123
+            data: dict[str, object] = tomllib.load(f)
+    except (tomllib.TOMLDecodeError, OSError):
+        return {}
+    tool_raw: object = data.get("tool", {})
+    if not isinstance(tool_raw, dict):
+        return {}
+    tool: dict[str, object] = tool_raw  # type: ignore[assignment]
+    devx_raw: object = tool.get("devx", {})
+    if not isinstance(devx_raw, dict):
+        return {}
+    devx: dict[str, object] = devx_raw  # type: ignore[assignment]
+    return devx
+
+
+_PYPROJECT = _load_pyproject_devx()
+
+
+def _get(key: str, env_var: str, default: str) -> str:
+    """Get a config value: env var > pyproject.toml > default."""
+    env_val = os.getenv(env_var)
+    if env_val is not None:
+        return env_val
+    pyproject_val = _PYPROJECT.get(key)
+    if isinstance(pyproject_val, str):
+        return pyproject_val
+    return default
+
+
+def _get_int(key: str, env_var: str, default: int) -> int:
+    """Get an int config value: env var > pyproject.toml > default."""
+    env_val = os.getenv(env_var)
+    if env_val is not None:
+        return int(env_val)
+    pyproject_val = _PYPROJECT.get(key)
+    if isinstance(pyproject_val, int):
+        return pyproject_val
+    return default
+
 
 # API endpoints — override via env vars for different Gitea/Vikunja instances
-GITEA_API_URL = os.getenv("DEVX_GITEA_API_URL", "https://git.oblachno.oblachno.fyi/api/v1")
-VIKUNJA_API_URL = os.getenv("DEVX_VIKUNJA_API_URL", "https://work.oblachno.oblachno.fyi/api/v1")
+GITEA_API_URL = _get("gitea_api_url", "DEVX_GITEA_API_URL", "https://git.oblachno.oblachno.fyi/api/v1")
+VIKUNJA_API_URL = _get("vikunja_api_url", "DEVX_VIKUNJA_API_URL", "https://work.oblachno.oblachno.fyi/api/v1")
 
 # Organization defaults — each project MUST set DEVX_REPO_OWNER explicitly.
 # No default: prevents silent 404s when the wrong owner is used.
-REPO_OWNER = os.getenv("DEVX_REPO_OWNER", "")
+REPO_OWNER = _get("repo_owner", "DEVX_REPO_OWNER", "")
 
 # Task prefix for Vikunja task IDs — each project sets its own (GRM, DEVX, INFRA, etc.)
-TASK_PREFIX = os.getenv("DEVX_TASK_PREFIX", "DEVX")
+TASK_PREFIX = _get("task_prefix", "DEVX_TASK_PREFIX", "DEVX")
 TASK_ID_RE = re.compile(rf"{TASK_PREFIX}-\d+")
 
 # Vikunja project ID — each project uses a different Vikunja project
-VIKUNJA_PROJECT_ID = int(os.getenv("DEVX_VIKUNJA_PROJECT_ID", "6"))
+VIKUNJA_PROJECT_ID = _get_int("vikunja_project_id", "DEVX_VIKUNJA_PROJECT_ID", 6)
 
 # HTTP client defaults
 DEFAULT_TIMEOUT = 30

src/devx/make/devx.mak

@@ -2,15 +2,16 @@
 #
 # This fragment provides common targets for Vikunja task management,
 # PR creation, and pushing. It is designed to be included from a
-# project's Makefile after project-specific variables are set.
+# project's Makefile.
+#
+# Project config (task prefix, Vikunja project ID, repo owner, repo name)
+# is read from [tool.devx] in pyproject.toml by devx.config — no
+# Makefile variables needed.
 #
 # Usage in your Makefile:
 #
-#   # Set project-specific variables
-#   DEVX_VIKUNJA_PROJECT_ID := 3
-#   DEVX_REPO_OWNER := oblachno
-#   DEVX_REPO_NAME := infra
-#   DEVX_PYTHON := python3  # or $(BIN)/python, etc.
+#   # Set DEVX_PYTHON if you need a specific interpreter
+#   DEVX_PYTHON := $(BIN)/python
 #
 #   # Include the devx fragment (silent if devx not installed yet)
 #   DEVX_MAK := $(shell $(DEVX_PYTHON) -c \
@@ -18,39 +19,34 @@
 #     2>/dev/null)
 #   -include $(DEVX_MAK)
 #
-# The fragment uses ?= for all variables so projects can override them
-# before the include. If devx is not installed, the -include silently
-# skips and the targets are simply unavailable (run 'make setup' first).
+# If devx is not installed, the -include silently skips and the targets
+# are simply unavailable (run 'make setup' first).
 #
 # Variables:
-#   DEVX_VIKUNJA_PROJECT_ID — Vikunja project ID (default: 1)
-#   DEVX_REPO_OWNER         — Gitea repository owner (default: empty)
-#   DEVX_REPO_NAME          — Gitea repository name (default: empty)
-#   DEVX_PYTHON             — Python executable (default: python3)
-#   DEVX_PR_BASE            — PR base branch (default: master)
+#   DEVX_PYTHON  — Python executable (default: python3)
+#   DEVX_PR_BASE — PR base branch (default: master)
 
-DEVX_VIKUNJA_PROJECT_ID ?= 1
-DEVX_REPO_OWNER ?=
-DEVX_REPO_NAME ?=
 DEVX_PYTHON ?= python3
 DEVX_PR_BASE ?= master
 
-.PHONY: devx-create-task devx-create-pr devx-push devx-push-with-pr
+.PHONY: devx-create-task devx-create-pr devx-push devx-push-with-pr devx-check-config
 
-# Create a Vikunja task in the configured project
+# Create a Vikunja task (project ID read from [tool.devx] in pyproject.toml)
 devx-create-task:
-	@$(DEVX_PYTHON) -m devx.tools.create_task --project-id $(DEVX_VIKUNJA_PROJECT_ID)
+	@$(DEVX_PYTHON) -m devx.tools.create_task
 
 # Create a PR with title auto-derived from the Vikunja task
+# (owner/repo read from [tool.devx] in pyproject.toml)
 devx-create-pr:
-	@$(DEVX_PYTHON) -m devx.tools.create_pr \
-		--owner $(DEVX_REPO_OWNER) \
-		--repo $(DEVX_REPO_NAME) \
-		--base $(DEVX_PR_BASE)
+	@$(DEVX_PYTHON) -m devx.tools.create_pr --base $(DEVX_PR_BASE)
 
 # Push current branch to origin
 devx-push:
 	@git push -u origin HEAD
 
+# Validate devx configuration in pyproject.toml
+devx-check-config:
+	@$(DEVX_PYTHON) -m devx.tools.check_config
+
 # Push and create PR in one step
 devx-push-with-pr: devx-push devx-create-pr

src/devx/tools/check_config.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+"""Validate devx configuration consistency in pyproject.toml.
+
+Checks:
+1. [tool.devx] section exists with required keys (task_prefix, vikunja_project_id, repo_owner, repo_name)
+2. devx version is consistent across all extras that mention it
+
+Usage::
+
+    python3 -m devx.tools.check_config
+"""
+
+from __future__ import annotations
+
+import re
+import sys
+import tomllib
+from pathlib import Path
+
+import click
+
+from devx.i18n import _
+
+
+@click.command()
+def cli() -> None:
+    """Validate devx configuration in pyproject.toml."""
+    path = Path("pyproject.toml")
+    if not path.exists():
+        click.echo(_("pyproject.toml not found in current directory."))
+        sys.exit(1)
+
+    with open(path, "rb") as f:  # noqa: PTH123
+        data = tomllib.load(f)
+
+    errors: list[str] = []
+
+    # Check [tool.devx] section
+    devx_cfg = data.get("tool", {}).get("devx", {})
+    required_keys = {"task_prefix", "vikunja_project_id", "repo_owner", "repo_name"}
+    missing = required_keys - set(devx_cfg.keys())
+    if missing:
+        errors.append(
+            _("[tool.devx] missing required keys: {keys}", keys=", ".join(sorted(missing))),
+        )
+
+    # Check devx version consistency across extras
+    optional_deps = data.get("project", {}).get("optional-dependencies", {})
+    devx_versions: dict[str, str] = {}
+    for extra_name, deps in optional_deps.items():
+        for dep in deps:
+            # Match "devx>=X.Y.Z", "devx==X.Y.Z", "devx>X.Y.Z", etc.
+            m = re.search(r"\bdevx\s*(>=|==|>|<=|<|~=)\s*([\d.]+)", dep)
+            if m:
+                devx_versions[extra_name] = m.group(2)
+
+    if devx_versions:
+        unique_versions = set(devx_versions.values())
+        if len(unique_versions) > 1:
+            detail = ", ".join(f"{extra}={v}" for extra, v in sorted(devx_versions.items()))
+            errors.append(
+                _("devx version mismatch across extras: {detail}", detail=detail),
+            )
+
+    if errors:
+        for err in errors:
+            click.echo(f"ERROR: {err}", err=True)
+        sys.exit(1)
+
+    click.echo(_("Configuration OK: [tool.devx] present, devx versions consistent."))
+
+
+if __name__ == "__main__":  # pragma: no cover
+    cli()  # pragma: no cover

src/devx/translations.json

@@ -439,6 +439,14 @@
     "ru": "Настройка параметров репозитория...",
     "zh": "正在配置仓库设置..."
   },
+  "Configuration OK: [tool.devx] present, devx versions consistent.": {
+    "bg": "Конфигурацията е OK: [tool.devx] присъства, версиите на devx са консистентни.",
+    "de": "Konfiguration OK: [tool.devx] vorhanden, devx-Versionen konsistent.",
+    "en": "Configuration OK: [tool.devx] present, devx versions consistent.",
+    "pl": "Konfiguracja OK: [tool.devx] obecne, wersje devx spójne.",
+    "ru": "Конфигурация OK: [tool.devx] присутствует, версии devx согласованы.",
+    "zh": "配置正常: [tool.devx] 已存在, devx 版本一致。"
+  },
   "Could not extract conventional commit message from PR commits.": {
     "bg": "Could not extract conventional commit message from PR commits.",
     "de": "Could not extract conventional commit message from PR commits.",
@@ -487,6 +495,14 @@
     "ru": "Created release commit.",
     "zh": "Created release commit."
   },
+  "devx version mismatch across extras: {detail}": {
+    "bg": "несъответствие на версията на devx между extras: {detail}",
+    "de": "devx-Versionskonflikt zwischen Extras: {detail}",
+    "en": "devx version mismatch across extras: {detail}",
+    "pl": "niezgodność wersji devx między extras: {detail}",
+    "ru": "несоответствие версии devx между extras: {detail}",
+    "zh": "devx 版本在 extras 之间不一致: {detail}"
+  },
   "Docker daemon already running": {
     "bg": "Докер демонът вече работи",
     "de": "Docker-Daemon läuft bereits",
@@ -1303,6 +1319,14 @@
     "ru": "Wiki verification failed — {failures} page(s) empty or mismatched",
     "zh": "Wiki verification failed — {failures} page(s) empty or mismatched"
   },
+  "[tool.devx] missing required keys: {keys}": {
+    "bg": "[tool.devx] липсват задължителни ключове: {keys}",
+    "de": "[tool.devx] fehlt erforderliche Schlüssel: {keys}",
+    "en": "[tool.devx] missing required keys: {keys}",
+    "pl": "[tool.devx] brak wymaganych kluczy: {keys}",
+    "ru": "[tool.devx] отсутствуют обязательные ключи: {keys}",
+    "zh": "[tool.devx] 缺少必需的键: {keys}"
+  },
   "[dry-run] Would commit: release: v{version}": {
     "bg": "[dry-run] Would commit: release: v{version}",
     "de": "[dry-run] Would commit: release: v{version}",
@@ -1455,6 +1479,14 @@
     "ru": "ожидает",
     "zh": "待处理"
   },
+  "pyproject.toml not found in current directory.": {
+    "bg": "pyproject.toml не е намерен в текущата директория.",
+    "de": "pyproject.toml im aktuellen Verzeichnis nicht gefunden.",
+    "en": "pyproject.toml not found in current directory.",
+    "pl": "nie znaleziono pyproject.toml w bieżącym katalogu.",
+    "ru": "pyproject.toml не найден в текущей директории.",
+    "zh": "在当前目录中未找到 pyproject.toml。"
+  },
   "unknown": {
     "bg": "неизвестен",
     "de": "unbekannt",

tests/unit/test_check_config.py

@@ -0,0 +1,90 @@
+"""Unit tests for devx.tools.check_config."""
+
+from pathlib import Path
+
+from click.testing import CliRunner
+
+from devx.tools.check_config import cli
+
+
+class TestCheckConfig:
+    def test_valid_config(self, tmp_path: Path) -> None:
+        """A valid [tool.devx] section with consistent versions passes."""
+        runner = CliRunner()
+        with runner.isolated_filesystem(temp_dir=str(tmp_path)) as fs:
+            Path(fs, "pyproject.toml").write_text(
+                '[project]\nname = "test"\n'
+                '[project.optional-dependencies]\nci = ["devx>=0.15.0"]\ndev = ["devx>=0.15.0"]\n'
+                '[tool.devx]\ntask_prefix = "TEST"\nvikunja_project_id = 1\nrepo_owner = "owner"\nrepo_name = "test"\n'
+            )
+            result = runner.invoke(cli)
+            assert result.exit_code == 0
+            assert "Configuration OK" in result.output
+
+    def test_missing_tool_devx_section(self, tmp_path: Path) -> None:
+        """Missing [tool.devx] section fails with error."""
+        runner = CliRunner()
+        with runner.isolated_filesystem(temp_dir=str(tmp_path)) as fs:
+            Path(fs, "pyproject.toml").write_text('[project]\nname = "test"\n')
+            result = runner.invoke(cli)
+            assert result.exit_code == 1
+            assert "missing required keys" in result.output
+
+    def test_partial_tool_devx_section(self, tmp_path: Path) -> None:
+        """Partial [tool.devx] section fails with missing keys."""
+        runner = CliRunner()
+        with runner.isolated_filesystem(temp_dir=str(tmp_path)) as fs:
+            Path(fs, "pyproject.toml").write_text('[project]\nname = "test"\n[tool.devx]\ntask_prefix = "TEST"\n')
+            result = runner.invoke(cli)
+            assert result.exit_code == 1
+            assert "missing required keys" in result.output
+            assert "vikunja_project_id" in result.output
+            assert "repo_owner" in result.output
+            assert "repo_name" in result.output
+
+    def test_version_mismatch(self, tmp_path: Path) -> None:
+        """Version mismatch across extras fails."""
+        runner = CliRunner()
+        with runner.isolated_filesystem(temp_dir=str(tmp_path)) as fs:
+            Path(fs, "pyproject.toml").write_text(
+                '[project]\nname = "test"\n'
+                "[project.optional-dependencies]\n"
+                'ci = ["devx>=0.15.0"]\n'
+                'dev = ["devx>=0.14.2"]\n'
+                '[tool.devx]\ntask_prefix = "TEST"\nvikunja_project_id = 1\nrepo_owner = "owner"\nrepo_name = "test"\n'
+            )
+            result = runner.invoke(cli)
+            assert result.exit_code == 1
+            assert "version mismatch" in result.output
+
+    def test_no_pyproject_file(self, tmp_path: Path) -> None:
+        """Missing pyproject.toml fails."""
+        runner = CliRunner()
+        with runner.isolated_filesystem(temp_dir=str(tmp_path)):
+            result = runner.invoke(cli)
+            assert result.exit_code == 1
+            assert "not found" in result.output
+
+    def test_no_extras_passes(self, tmp_path: Path) -> None:
+        """No optional-dependencies with devx is fine (no versions to compare)."""
+        runner = CliRunner()
+        with runner.isolated_filesystem(temp_dir=str(tmp_path)) as fs:
+            Path(fs, "pyproject.toml").write_text(
+                '[project]\nname = "test"\n'
+                '[tool.devx]\ntask_prefix = "TEST"\nvikunja_project_id = 1\nrepo_owner = "owner"\nrepo_name = "test"\n'
+            )
+            result = runner.invoke(cli)
+            assert result.exit_code == 0
+            assert "Configuration OK" in result.output
+
+    def test_single_extra_passes(self, tmp_path: Path) -> None:
+        """Single extra with devx version is fine (no mismatch possible)."""
+        runner = CliRunner()
+        with runner.isolated_filesystem(temp_dir=str(tmp_path)) as fs:
+            Path(fs, "pyproject.toml").write_text(
+                '[project]\nname = "test"\n'
+                '[project.optional-dependencies]\nci = ["devx>=0.15.0", "pytest"]\n'
+                '[tool.devx]\ntask_prefix = "TEST"\nvikunja_project_id = 1\nrepo_owner = "owner"\nrepo_name = "test"\n'
+            )
+            result = runner.invoke(cli)
+            assert result.exit_code == 0

tests/unit/test_config.py

@@ -1,12 +1,14 @@
 """Unit tests for config module constants."""
 
+import importlib
+from pathlib import Path
+
 from devx.config import (
     CONVENTIONAL_RE,
     DEFAULT_PER_PAGE,
     DEFAULT_TIMEOUT,
     GITEA_API_URL,
     MAX_RETRIES,
-    REPO_OWNER,
     RETRY_BACKOFF_BASE,
     RETRY_STATUS_CODES,
     TASK_ID_RE,
@@ -20,25 +22,10 @@ class TestConfigConstants:
         assert "api/v1" in GITEA_API_URL
         assert "api/v1" in VIKUNJA_API_URL
 
-    def test_project_ids(self, monkeypatch: object) -> None:
-        """VIKUNJA_PROJECT_ID defaults to 6 when DEVX_VIKUNJA_PROJECT_ID is not set."""
-        monkeypatch.delenv("DEVX_VIKUNJA_PROJECT_ID", raising=False)
-        import importlib
-
-        import devx.config as cfg
-
-        importlib.reload(cfg)
-        assert cfg.VIKUNJA_PROJECT_ID == 6
-        # Restore module state
-        importlib.reload(cfg)
-
     def test_timeouts(self) -> None:
         assert DEFAULT_TIMEOUT == 30
         assert DEFAULT_PER_PAGE == 50
 
-    def test_owner(self) -> None:
-        assert REPO_OWNER == ""
-
     def test_task_prefix(self) -> None:
         assert TASK_PREFIX == "DEVX"
 
@@ -64,28 +51,100 @@ class TestConfigConstants:
         assert 503 in RETRY_STATUS_CODES
         assert 504 in RETRY_STATUS_CODES
 
-    def test_env_var_override(self, monkeypatch: object) -> None:
-        """Test that env vars override defaults at import time."""
-        # We can't easily re-import the module, but we can verify
-        # the constants respect env vars by checking the module source.
+
+class TestPyprojectReading:
+    """Test that config.py reads [tool.devx] from pyproject.toml."""
+
+    def test_pyproject_provides_values(self) -> None:
+        """When pyproject.toml has [tool.devx], values are read from it."""
         import devx.config as cfg
 
-        assert cfg.GITEA_API_URL  # always non-empty
-        assert cfg.VIKUNJA_API_URL  # always non-empty
+        # devx's own pyproject.toml has task_prefix=DEVX, vikunja_project_id=8
+        assert cfg.TASK_PREFIX == "DEVX"
+        assert cfg.VIKUNJA_PROJECT_ID == 8
+        assert cfg.REPO_OWNER == "oblachno-oss"
+
+    def test_env_overrides_pyproject(self, monkeypatch: object) -> None:
+        """Env vars take priority over pyproject.toml."""
+        monkeypatch.setenv("DEVX_TASK_PREFIX", "CUSTOM")
+        import devx.config as cfg
+
+        importlib.reload(cfg)
+        assert cfg.TASK_PREFIX == "CUSTOM"
+        assert cfg.TASK_ID_RE.search("CUSTOM-42")
+        monkeypatch.delenv("DEVX_TASK_PREFIX", raising=False)
+        importlib.reload(cfg)
+
+    def test_no_pyproject_falls_back_to_defaults(self, monkeypatch: object, tmp_path: Path) -> None:
+        """When no pyproject.toml exists, defaults are used."""
+        monkeypatch.chdir(tmp_path)
+        monkeypatch.delenv("DEVX_TASK_PREFIX", raising=False)
+        monkeypatch.delenv("DEVX_VIKUNJA_PROJECT_ID", raising=False)
+        monkeypatch.delenv("DEVX_REPO_OWNER", raising=False)
+        import devx.config as cfg
+
+        importlib.reload(cfg)
+        assert cfg.TASK_PREFIX == "DEVX"
+        assert cfg.VIKUNJA_PROJECT_ID == 6
+        assert cfg.REPO_OWNER == ""
+        importlib.reload(cfg)
+
+    def test_invalid_toml_falls_back_to_defaults(self, monkeypatch: object, tmp_path: Path) -> None:
+        """When pyproject.toml is invalid TOML, defaults are used."""
+        (tmp_path / "pyproject.toml").write_text("invalid toml {{{")
+        monkeypatch.chdir(tmp_path)
+        monkeypatch.delenv("DEVX_TASK_PREFIX", raising=False)
+        import devx.config as cfg
+
+        importlib.reload(cfg)
+        assert cfg.TASK_PREFIX == "DEVX"
+        importlib.reload(cfg)
+
+    def test_no_devx_section_falls_back_to_defaults(self, monkeypatch: object, tmp_path: Path) -> None:
+        """When pyproject.toml has no [tool.devx], defaults are used."""
+        (tmp_path / "pyproject.toml").write_text('[project]\nname = "test"\n')
+        monkeypatch.chdir(tmp_path)
+        monkeypatch.delenv("DEVX_TASK_PREFIX", raising=False)
+        monkeypatch.delenv("DEVX_VIKUNJA_PROJECT_ID", raising=False)
+        import devx.config as cfg
+
+        importlib.reload(cfg)
+        assert cfg.TASK_PREFIX == "DEVX"
+        assert cfg.VIKUNJA_PROJECT_ID == 6
+        importlib.reload(cfg)
+
+    def test_tool_not_dict_falls_back_to_defaults(self, monkeypatch: object, tmp_path: Path) -> None:
+        """When [tool] is not a dict, defaults are used."""
+        (tmp_path / "pyproject.toml").write_text('tool = "not a dict"\n')
+        monkeypatch.chdir(tmp_path)
+        monkeypatch.delenv("DEVX_TASK_PREFIX", raising=False)
+        import devx.config as cfg
+
+        importlib.reload(cfg)
+        assert cfg.TASK_PREFIX == "DEVX"
+        importlib.reload(cfg)
+
+    def test_devx_not_dict_falls_back_to_defaults(self, monkeypatch: object, tmp_path: Path) -> None:
+        """When [tool.devx] is not a dict, defaults are used."""
+        (tmp_path / "pyproject.toml").write_text('[tool]\ndevx = "not a dict"\n')
+        monkeypatch.chdir(tmp_path)
+        monkeypatch.delenv("DEVX_TASK_PREFIX", raising=False)
+        import devx.config as cfg
+
+        importlib.reload(cfg)
+        assert cfg.TASK_PREFIX == "DEVX"
+        importlib.reload(cfg)
 
 
 class TestTaskPrefixOverride:
     def test_task_prefix_from_env(self, monkeypatch: object) -> None:
         """Verify TASK_PREFIX reads from DEVX_TASK_PREFIX env var."""
         monkeypatch.setenv("DEVX_TASK_PREFIX", "INFRA")
-        import importlib
-
         import devx.config as cfg
 
         importlib.reload(cfg)
         assert cfg.TASK_PREFIX == "INFRA"
         assert cfg.TASK_ID_RE.search("INFRA-42")
         assert not cfg.TASK_ID_RE.search("DEVX-42")
-        # Restore
         monkeypatch.delenv("DEVX_TASK_PREFIX", raising=False)
         importlib.reload(cfg)