diff --git a/packages/sphinx-codelinks/docs/changelog.rst b/packages/sphinx-codelinks/docs/changelog.rst
index d6a42e46d..c16116b6e 100644
--- a/packages/sphinx-codelinks/docs/changelog.rst
+++ b/packages/sphinx-codelinks/docs/changelog.rst
@@ -59,6 +59,13 @@ New and Improved
   Sphinx-Needs workspace declares and type-checks against. There is no upper bound: Sphinx
   caps docutils per series itself.
 
+- 🐛 ``src_trace_projects`` declared directly in ``conf.py`` are normalised before
+  ``src-trace`` reads them.
+
+  Projects configured without ``ubproject.toml`` now get the same typed
+  ``source_discover_config`` and ``analyse_config`` objects as TOML-backed projects, so a
+  ``src-trace`` directive no longer fails with ``KeyError: 'source_discover_config'``.
+
 - 🐛 ``sphinx_codelinks.__version__`` reported ``"0.1.0"``.
 
   It had said so since the first commit, through seven releases, while the distribution
diff --git a/packages/sphinx-codelinks/src/sphinx_codelinks/config.py b/packages/sphinx-codelinks/src/sphinx_codelinks/config.py
index 54bc9d3ad..e817ba188 100644
--- a/packages/sphinx-codelinks/src/sphinx_codelinks/config.py
+++ b/packages/sphinx-codelinks/src/sphinx_codelinks/config.py
@@ -637,6 +637,9 @@ class CodeLinksConfig:
     @classmethod
     def from_sphinx(cls, sphinx_config: _SphinxConfig) -> "CodeLinksConfig":
         obj = cls()
+        src_trace_projects = getattr(sphinx_config, "src_trace_projects", None)
+        if isinstance(src_trace_projects, dict):
+            generate_project_configs(src_trace_projects)
         super().__setattr__(obj, "_sphinx_config", sphinx_config)
         return obj
 
diff --git a/packages/sphinx-codelinks/tests/test_src_trace.py b/packages/sphinx-codelinks/tests/test_src_trace.py
index 0b458d73e..25d74f235 100644
--- a/packages/sphinx-codelinks/tests/test_src_trace.py
+++ b/packages/sphinx-codelinks/tests/test_src_trace.py
@@ -795,6 +795,32 @@ def _traced_project(root: Path, conf_extra: str, files: dict[str, str]) -> None:
 _PROJECT_P = '[codelinks.projects.p.source_discover]\nsrc_dir = "./src"\ncomment_type = "python"\n'
 
 
+def test_conf_py_projects_are_normalized_for_src_trace(
+    tmp_path: Path,
+    make_app: Callable[..., SphinxTestApp],
+) -> None:
+    """Projects declared in ``conf.py`` get the same typed config as TOML projects."""
+    _traced_project(
+        tmp_path,
+        "src_trace_config_from_toml = None\n"
+        "src_trace_projects = {\n"
+        "    'p': {\n"
+        "        'source_discover': {\n"
+        "            'src_dir': './src',\n"
+        "            'comment_type': 'python',\n"
+        "        },\n"
+        "        'analyse': {},\n"
+        "    },\n"
+        "}\n",
+        {"src/a.py": _MARKER.format(tag="CONFPY")},
+    )
+    app = make_app(srcdir=tmp_path, freshenv=True)
+    app.build()
+
+    html = Path(app.outdir, "index.html").read_text(encoding="utf-8")
+    assert "IMPL_CONFPY" in html
+
+
 def test_symlinked_toml_anchors_at_the_links_directory(
     tmp_path: Path,
     make_app: Callable[..., SphinxTestApp],