diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4ae85be..4d2a621 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,36 @@
 
 All notable changes to this project are documented here.
 
+## [0.3.10] - 2026-07-19
+
+### Fixed
+
+- The `requirements` checker now matches the exact Codex 0.144.6
+  `ConfigRequirementsToml` surface, correcting fail-closed defects that rejected
+  valid managed files. The managed key set uses `experimental_network` (not
+  `network`) and accepts the `feature_requirements` alias for `features`;
+  `allowed_permission_profiles` entries that are not built-ins are no longer
+  rejected (they may be defined in a lower config layer); and `mcp_servers`,
+  `features`, and other managed values are no longer validated with config.toml
+  shapes. Permission-profile validation mirrors Codex exactly: `default_permissions`
+  requires `allowed_permission_profiles`, the effective default must map to `true`,
+  and the implicit `:workspace` default requires both `:workspace` and `:read-only`
+  to be allowed.
+
+### Added
+
+- The `marketplace` checker discovers `.claude-plugin/marketplace.json` (the third
+  manifest filename Codex recognizes) alongside `marketplace.json` and
+  `api_marketplace.json`.
+- `create_codex_artifact.py marketplace` gains `--source-type`
+  (`local`/`url`/`git-subdir`/`npm`) with matching source fields, so the creator
+  scaffolds every plugin source the checker accepts.
+
+### Changed
+
+- The builder plugin advances to 0.3.5 so an in-place `install-builder`
+  re-materializes the cache after the checker and generator change.
+
 ## [0.3.9] - 2026-07-19
 
 ### Added
diff --git a/VERSION b/VERSION
index 940ac09..5503126 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.3.9
+0.3.10
diff --git a/build/manifest.json b/build/manifest.json
index ba01d16..da77f80 100644
--- a/build/manifest.json
+++ b/build/manifest.json
@@ -5,7 +5,7 @@
     "location": "sibling .<target-name>.nddev-codex-backups",
     "slots": 10
   },
-  "build_version": "0.3.9",
+  "build_version": "0.3.10",
   "command_policy": {
     "json_supported": [
       "list",
diff --git a/build/release-evidence.json b/build/release-evidence.json
index 1505016..4782c28 100644
--- a/build/release-evidence.json
+++ b/build/release-evidence.json
@@ -2,15 +2,15 @@
   "schema_version": 2,
   "module": {
     "repository": "NDDev-it-com/nddev-codex-app",
-    "setup_digest": "sha256:83fe1de1c52078510e2b4dd42d08863fb804fedb7fef60a656cd4941714d67a3"
+    "setup_digest": "sha256:7af08077a27c6133d2ec29bbd948ab192341a65a4f6158b64375e15bb395dd93"
   },
   "harness": {
     "repository": "NDDev-it-com/nddev-harnesses",
-    "commit": "7ea592555c7bc48e94208602d0acda24f714f95f"
+    "commit": "656095c3922e6354e6b87fabb9fe137b74d7a29d"
   },
   "adapter": {
     "id": "codex",
-    "version": "0.3.9"
+    "version": "0.3.10"
   },
   "vendor": {
     "cli_version": "0.144.6",
@@ -29,8 +29,8 @@
     }
   ],
   "lanes": [],
-  "generated_at_utc": "2026-07-19T06:27:12Z",
-  "expires_at_utc": "2027-01-15T06:27:12Z",
+  "generated_at_utc": "2026-07-19T07:13:38Z",
+  "expires_at_utc": "2027-01-15T07:13:38Z",
   "promotion": {
     "decision": "pending",
     "waivers": []
diff --git a/build/version.json b/build/version.json
index 94e0227..821e376 100644
--- a/build/version.json
+++ b/build/version.json
@@ -1,8 +1,8 @@
 {
-  "build_version": "0.3.9",
+  "build_version": "0.3.10",
   "codex_permission_profiles_since": "0.138.0",
   "codex_cli_tested": "0.144.6",
-  "nddev_builder_plugin_version": "0.3.4",
+  "nddev_builder_plugin_version": "0.3.5",
   "python_requires": ">=3.10",
   "runtime_baseline_ref": "references/codex-baseline.json",
   "schema_version": 2
diff --git a/plugins/nddev-builder/.codex-plugin/plugin.json b/plugins/nddev-builder/.codex-plugin/plugin.json
index 02aa506..790b67c 100644
--- a/plugins/nddev-builder/.codex-plugin/plugin.json
+++ b/plugins/nddev-builder/.codex-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
   "name": "nddev-builder",
-  "version": "0.3.4",
+  "version": "0.3.5",
   "description": "Create and validate native Codex skills, plugins, marketplaces, agents, hooks, MCP servers, app mappings, configuration, instructions, execpolicy rules, and managed requirements.",
   "author": {
     "name": "Danil Silantyev / NDDev",
diff --git a/plugins/nddev-builder/README.md b/plugins/nddev-builder/README.md
index 1cc6158..8445f91 100644
--- a/plugins/nddev-builder/README.md
+++ b/plugins/nddev-builder/README.md
@@ -69,9 +69,10 @@ python3 scripts/check_codex_artifact.py skill \
 
 Supported generator/checker kinds are `skill`, `plugin`, `marketplace`,
 `agent`, `hook`, `mcp`, `app`, `config`, `instructions`, `rule`, and
-`requirements`. The `marketplace` checker accepts `local`, `url`, `git-subdir`,
-and `npm` plugin sources and also discovers a sibling `api_marketplace.json`
-catalog. Run each
+`requirements`. The `marketplace` generator and checker both cover `local`,
+`url`, `git-subdir`, and `npm` plugin sources (use `--source-type`), and the
+checker discovers `marketplace.json`, `api_marketplace.json`, and
+`.claude-plugin/marketplace.json` catalogs. Run each
 script with `--help` before using kind-specific options such as `--app-id`,
 `--transport`, `--event`, or `--prefix`. Use `--json` when another tool needs a
 stable machine-readable result.
diff --git a/plugins/nddev-builder/scripts/check_codex_artifact.py b/plugins/nddev-builder/scripts/check_codex_artifact.py
index 8d3457d..1d44d58 100644
--- a/plugins/nddev-builder/scripts/check_codex_artifact.py
+++ b/plugins/nddev-builder/scripts/check_codex_artifact.py
@@ -2927,7 +2927,9 @@ def _validate_config_file(path: Path, *, budget: ScanBudget | None = None) -> Ar
     "allow_remote_control",
     "computer_use",
     "windows",
+    # `features` is the primary key; `feature_requirements` is its serde alias.
     "features",
+    "feature_requirements",
     "hooks",
     "mcp_servers",
     "plugins",
@@ -2935,7 +2937,8 @@ def _validate_config_file(path: Path, *, budget: ScanBudget | None = None) -> Ar
     "apps",
     "rules",
     "enforce_residency",
-    "network",
+    # The struct field is `network` but its serde rename is `experimental_network`.
+    "experimental_network",
     "permissions",
     "models",
     "guardian_policy_config",
@@ -2949,15 +2952,15 @@ def _validate_requirements_file(
     report = ArtifactReport("requirements", path, budget=budget or ScanBudget())
     if not _preflight_path(report, path, directory=False):
         return report
-    payload, text = _load_toml(report, path)
-    if text is None:
-        return report
-    # Reuse the shared safety gates: deprecated keys, legacy profile selectors, the
-    # mixed sandbox/permission surface, default_permissions built-in check, sandbox_mode,
-    # features booleans, reasoning efforts, and mcp_servers shape.
-    _config_key_checks(report, path, payload, text)
+    payload, _text = _load_toml(report, path)
     if payload is None:
+        # _load_toml already emitted a fail-closed error (unreadable, Python 3.10
+        # without tomllib, invalid TOML, or a non-table root).
         return report
+    # Do NOT reuse _config_key_checks here: requirements.toml has its own key surface
+    # (REQUIREMENTS_TOP_LEVEL_KEYS), and its `mcp_servers`/`features` values use managed
+    # requirement shapes (McpServerRequirement, a feature->bool map) distinct from
+    # config.toml, so config-shape validation would reject valid managed files.
     _unknown_keys(
         report,
         path,
@@ -2965,12 +2968,17 @@ def _validate_requirements_file(
         REQUIREMENTS_TOP_LEVEL_KEYS,
         "Codex 0.144.6 requirements top-level",
     )
-    defined_profiles: set[str] = set()
-    permissions = payload.get("permissions")
-    if isinstance(permissions, dict):
-        defined_profiles = {key for key in permissions if isinstance(key, str)}
     allowed = payload.get("allowed_permission_profiles")
+    default_permissions = payload.get("default_permissions")
     if allowed is None:
+        # Codex requires allowed_permission_profiles whenever default_permissions is set.
+        if default_permissions is not None:
+            report.error(
+                "permission-profile",
+                path,
+                "default_permissions requires allowed_permission_profiles",
+            )
+        _requirements_flag_checks(report, path, payload)
         return report
     if not isinstance(allowed, dict) or not allowed:
         report.error(
@@ -2978,7 +2986,12 @@ def _validate_requirements_file(
             path,
             "allowed_permission_profiles must be a non-empty table of profile name to boolean",
         )
+        _requirements_flag_checks(report, path, payload)
         return report
+    # A profile counts as allowed only when present AND mapped to true (Codex
+    # `is_permission_allowed`). Non-built-in profiles may be defined in a lower
+    # config layer, so a single-file static check must not reject them.
+    allowed_true: set[str] = set()
     for profile, enabled in allowed.items():
         if not isinstance(profile, str) or not profile.strip():
             report.error(
@@ -2993,36 +3006,49 @@ def _validate_requirements_file(
                 path,
                 f"allowed_permission_profiles entry `{profile}` must map to a boolean",
             )
-        if profile.startswith(":"):
-            if profile not in _BUILTIN_PERMISSION_PROFILES:
-                report.error(
-                    "permission-profile",
-                    path,
-                    f"allowed_permission_profiles entry `{profile}` is an unknown built-in profile",
-                )
-        elif profile not in defined_profiles:
+            continue
+        if profile.startswith(":") and profile not in _BUILTIN_PERMISSION_PROFILES:
             report.error(
                 "permission-profile",
                 path,
-                f"allowed_permission_profiles entry `{profile}` is not defined under [permissions.{profile}]",
+                f"allowed_permission_profiles entry `{profile}` is an unknown built-in profile",
             )
-    default_permissions = payload.get("default_permissions")
+        if enabled:
+            allowed_true.add(profile)
+    # Resolve the effective default as Codex does: the explicit default, else the
+    # implicit `:workspace` only when both `:workspace` and `:read-only` are allowed.
     if isinstance(default_permissions, str) and default_permissions.strip():
-        if default_permissions not in allowed:
-            report.error(
-                "permission-profile",
-                path,
-                "default_permissions must be one of the allowed_permission_profiles entries",
-            )
-    elif default_permissions is None and not {":read-only", ":workspace"} <= set(allowed):
+        effective_default: str | None = default_permissions
+    elif default_permissions is None and {":workspace", ":read-only"} <= allowed_true:
+        effective_default = ":workspace"
+    else:
+        effective_default = None
+    if effective_default is None:
         report.error(
             "permission-profile",
             path,
-            "allowed_permission_profiles must permit both :read-only and :workspace when default_permissions is unset",
+            "default_permissions must be set unless allowed_permission_profiles allows both :read-only and :workspace",
         )
+    elif effective_default not in allowed_true:
+        report.error(
+            "permission-profile",
+            path,
+            f"default_permissions `{effective_default}` must be allowed (set to true) by allowed_permission_profiles",
+        )
+    _requirements_flag_checks(report, path, payload)
     return report
 
 
+def _requirements_flag_checks(report: ArtifactReport, path: Path, payload: dict[str, Any]) -> None:
+    for bool_key in ("allow_managed_hooks_only", "allow_appshots", "allow_remote_control"):
+        value = payload.get(bool_key)
+        if value is not None and not isinstance(value, bool):
+            report.error("type", path, f"{bool_key} must be a boolean")
+    guardian = payload.get("guardian_policy_config")
+    if guardian is not None and (not isinstance(guardian, str) or not guardian.strip()):
+        report.error("type", path, "guardian_policy_config must be a non-empty string")
+
+
 def _validate_instructions_file(path: Path, *, budget: ScanBudget | None = None) -> ArtifactReport:
     report = ArtifactReport("instructions", path, budget=budget or ScanBudget())
     if not _preflight_path(report, path, directory=False):
@@ -3265,6 +3291,8 @@ def _artifact_candidate(path: Path) -> tuple[str, Path] | None:
         and path.parent.parent.name == ".agents"
     ):
         return "marketplace", path
+    if path.name == "marketplace.json" and path.parent.name == ".claude-plugin":
+        return "marketplace", path
     if path.name == "hooks.json":
         return "hook", path
     if path.name == ".mcp.json":
diff --git a/plugins/nddev-builder/scripts/create_codex_artifact.py b/plugins/nddev-builder/scripts/create_codex_artifact.py
index a29950e..4f090ab 100644
--- a/plugins/nddev-builder/scripts/create_codex_artifact.py
+++ b/plugins/nddev-builder/scripts/create_codex_artifact.py
@@ -916,13 +916,47 @@ def validate_plugin_path(raw_path: str) -> str:
     return raw_path.rstrip("/")
 
 
+def _marketplace_source(args: argparse.Namespace, plugin_name: str) -> dict[str, str]:
+    source_type = args.source_type
+    if source_type == "local":
+        path = validate_plugin_path(args.plugin_path or f"./plugins/{plugin_name}")
+        return {"source": "local", "path": path}
+    if source_type == "url":
+        if not args.source_url:
+            fail("--source-type url requires --source-url")
+        source: dict[str, str] = {"source": "url", "url": args.source_url}
+        if args.source_subdir:
+            source["path"] = args.source_subdir
+        if args.source_ref:
+            source["ref"] = args.source_ref
+        return source
+    if source_type == "git-subdir":
+        if not args.source_url or not args.source_subdir:
+            fail("--source-type git-subdir requires --source-url and --source-subdir")
+        source = {"source": "git-subdir", "url": args.source_url, "path": args.source_subdir}
+        if args.source_ref:
+            source["ref"] = args.source_ref
+        return source
+    if source_type == "npm":
+        if not args.npm_package:
+            fail("--source-type npm requires --npm-package")
+        source = {"source": "npm", "package": args.npm_package}
+        if args.npm_version:
+            source["version"] = args.npm_version
+        if args.npm_registry:
+            if not args.npm_registry.startswith("https://"):
+                fail("--npm-registry must be an https:// URL")
+            source["registry"] = args.npm_registry
+        return source
+    fail(f"unknown --source-type `{source_type}`")
+
+
 def create_marketplace(
     args: argparse.Namespace, output: Path, name: str, description: str
 ) -> CreationPlan:
     if not args.plugin_name:
         fail("marketplace creation requires --plugin-name")
     plugin_name = validate_name(args.plugin_name, "--plugin-name")
-    plugin_path = validate_plugin_path(args.plugin_path or f"./plugins/{plugin_name}")
     category = validate_required_line(args.category, "--category")
     manifest_path = output / ".agents" / "plugins" / "marketplace.json"
     marketplace = {
@@ -931,7 +965,7 @@ def create_marketplace(
         "plugins": [
             {
                 "name": plugin_name,
-                "source": {"source": "local", "path": plugin_path},
+                "source": _marketplace_source(args, plugin_name),
                 "policy": {
                     "installation": args.install_policy,
                     "authentication": args.auth_policy,
@@ -1221,6 +1255,15 @@ def build_parser() -> argparse.ArgumentParser:
     parser.add_argument("--category", default="Developer Tools")
     parser.add_argument("--plugin-name")
     parser.add_argument("--plugin-path")
+    parser.add_argument(
+        "--source-type", choices=("local", "url", "git-subdir", "npm"), default="local"
+    )
+    parser.add_argument("--source-url")
+    parser.add_argument("--source-subdir")
+    parser.add_argument("--source-ref")
+    parser.add_argument("--npm-package")
+    parser.add_argument("--npm-version")
+    parser.add_argument("--npm-registry")
     parser.add_argument(
         "--install-policy",
         choices=("AVAILABLE", "INSTALLED_BY_DEFAULT", "NOT_AVAILABLE"),
diff --git a/plugins/nddev-builder/skills/codex-marketplace-creator/SKILL.md b/plugins/nddev-builder/skills/codex-marketplace-creator/SKILL.md
index 4f78222..8172153 100644
--- a/plugins/nddev-builder/skills/codex-marketplace-creator/SKILL.md
+++ b/plugins/nddev-builder/skills/codex-marketplace-creator/SKILL.md
@@ -19,7 +19,7 @@ Create a small, auditable catalog that points to canonical plugin sources withou
        python3 ../../scripts/create_codex_artifact.py marketplace --output . --name example-marketplace --description "Curated Codex plugins for this repository" --plugin-name example-plugin
 
 4. Add stable plugin identifiers and resolvable sources. Keep each category and policy aligned with actual behavior.
-5. Prefer immutable remote references for releases and local relative sources for repository development.
+5. Select the source with `--source-type`: `local` for repository development, or `url`, `git-subdir`, or `npm` for remote releases. Prefer immutable remote references (`ref`/`sha` or a pinned `npm` version) for releases.
 6. Do not embed credentials, environment values, or duplicate plugin manifests.
 7. Validate the catalog and all reachable local plugins: