diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4e88169..43f9bfa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Snyk scope baseline in generated projects: `.snyk` (exclude paths for
+  `.venv/`, `.worktrees/`, `node_modules/`, `site/`, `htmlcov/`, `out/`,
+  and `**/site-packages/**`) prevents Snyk's filesystem scan from walking
+  into virtual environments and vendored packages; `.dcignore` applies the
+  same exclusions to Snyk Code; `.vscode/settings.json` adds
+  `snyk.advanced.additionalParameters` for the VS Code extension. Note:
+  `.gitignore` does not constrain Snyk's scan; these files are required to
+  scope it to project-owned code
 - `qlty.yml` reusable-workflow caller in generated projects'
   `.github/workflows/` (satisfies CI-013 manifest gap); pins upstream
   `python-qlty-coverage.yml` at SHA `1b2d33c4`; runs on CI workflow_run
diff --git a/{{cookiecutter.project_slug}}/.dcignore b/{{cookiecutter.project_slug}}/.dcignore
new file mode 100644
index 0000000..5493c01
--- /dev/null
+++ b/{{cookiecutter.project_slug}}/.dcignore
@@ -0,0 +1,10 @@
+# Snyk Code scope configuration (gitignore-style).
+# .dcignore scopes Snyk Code's filesystem scan to project-owned code.
+# Paths listed here are excluded from Snyk Code analysis.
+.venv/
+.worktrees/
+node_modules/
+site/
+htmlcov/
+out/
+**/site-packages/**
diff --git a/{{cookiecutter.project_slug}}/.gitignore b/{{cookiecutter.project_slug}}/.gitignore
index 8ac6ccc..63ab2dd 100644
--- a/{{cookiecutter.project_slug}}/.gitignore
+++ b/{{cookiecutter.project_slug}}/.gitignore
@@ -148,6 +148,8 @@ dmypy.json
 
 # IDE specific files
 .vscode/
+# Track Snyk VS Code extension settings (project-scoped, not personal IDE settings)
+!.vscode/settings.json
 .idea/
 *.swp
 *.swo
@@ -219,6 +221,8 @@ ENV/
 
 # IDE and Editor files
 .vscode
+# Track Snyk VS Code extension settings (project-scoped, not personal IDE settings)
+!.vscode/settings.json
 .idea
 .sublime-project
 .sublime-workspace
diff --git a/{{cookiecutter.project_slug}}/.snyk b/{{cookiecutter.project_slug}}/.snyk
new file mode 100644
index 0000000..dda8e3b
--- /dev/null
+++ b/{{cookiecutter.project_slug}}/.snyk
@@ -0,0 +1,19 @@
+# Snyk scope configuration.
+# Snyk scans the on-disk working tree, not git or the project manifests, so
+# it walks into virtual environments, worktrees, and vendored packages and
+# reports their dependencies as if they belong to this project.
+# .gitignore does NOT constrain Snyk's filesystem scan.
+# The paths below scope Snyk to project-owned code only.
+version: v1.25.0
+exclude:
+  global:
+    - .venv/**
+    - "**/.venv/**"
+    - .worktrees/**
+    - "**/.worktrees/**"
+    - node_modules/**
+    - "**/node_modules/**"
+    - site/**
+    - htmlcov/**
+    - out/**
+    - "**/site-packages/**"
diff --git a/{{cookiecutter.project_slug}}/.vscode/settings.json b/{{cookiecutter.project_slug}}/.vscode/settings.json
new file mode 100644
index 0000000..8aae378
--- /dev/null
+++ b/{{cookiecutter.project_slug}}/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+  "snyk.advanced.additionalParameters": "--exclude=.venv,.worktrees,node_modules,site,htmlcov,out"
+}