diff --git a/CLAUDE.md b/CLAUDE.md
index f51a96d56..a37cec4ca 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -39,6 +39,7 @@ PdfCraft is a clean-room, open-source, Rust-native PDF application targeting Ado
   - **Rebasing is a review step, not a mechanical one.** Read every hunk you resolve, and the auto-merged hunks in the files you touched too — `main` moves fast enough that a file can change by hundreds of lines under a branch.
 - **External PRs are held to safety, security and completeness before style.** Provenance first (no Adobe-derived asset, no committed font, no copied GPL/AGPL code, behaviour from the spec and not from reading another implementation), then no new panic path or `unsafe`, then `--root` confinement on every path including ones reached by nested dispatch, opt-in-only MCP and control channel, no new outbound network, then a headless `automation` tool, tests at the right zoom and an honest `parity/` entry. Provenance is the part a contributor cannot be expected to know, and the only part that cannot be undone after merge.
 - **Quality gates** before every commit: `cargo fmt --check`, clippy with `-D warnings`, the tests, `cargo xtask layers`, `cargo xtask assets`, and the wasm check once `xtask ci` exists (M0).
+  - New workspace crates must include `[lints] workspace = true` in `Cargo.toml` to inherit `[workspace.lints]`. Production crate roots must declare the required crate-level lint attributes before modules or other crate items; crate-level `//!` documentation may precede them.
   - **Scope builds and tests to the crates you touched** — `cargo clippy -p <crate> -j 2 --all-targets` and `cargo test -p <crate> -j 2`, under a `timeout`. A full `--workspace` build has locked up a development machine's CPU; it is CI's job and CI runs it on every PR. Run the workspace sweep locally only when you have a reason to and the machine is free.
 - **Check for existing work before starting a fix or feature.** Search the issues and PRs, open and closed, with `gh issue list -R storytold/pdfcraft --state all --search "<terms>"` and the same with `gh pr list` (try a few phrasings), and check whether a merged fix is already on `main` (`git merge-base --is-ancestor <commit> origin/main`). If one is, the report is likely from an older build: say so rather than fixing it again. If an open PR covers it, review or build on that PR instead of opening a competing one. If an issue exists, reference it in the PR (`Fixes #123`).
 - **Commits and PRs:** `main` is the only integration branch and is **never pushed to directly**. Branch from an up-to-date `main` as `<type>/<slug>` (`feat/`, `fix/`, `docs/`, `chore/`, `refactor/`), one task id per commit (e.g. `M1.4: xref stream reader`), commit only green states, and open a PR into `main` using `.github/pull_request_template.md`. Merge only when CI is green.
diff --git a/Cargo.toml b/Cargo.toml
index 99f9fa251..24313021b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -91,6 +91,9 @@ web-time = "1.1"
 unsafe_code = "forbid"
 
 [workspace.lints.clippy]
+cognitive_complexity = "deny"
+too_many_arguments = "deny"
+wildcard_imports = "deny"
 dbg_macro = "warn"
 todo = "warn"
 
diff --git a/clippy.toml b/clippy.toml
index e908d1358..31e54da30 100644
--- a/clippy.toml
+++ b/clippy.toml
@@ -13,6 +13,7 @@ disallowed-methods = [
     { path = "egui::Ui::radio_value", reason = "use radio_value from crates/ui-egui/src/widgets.rs, which is outlined and filled" },
     { path = "egui::RadioButton::new", reason = "use radio from crates/ui-egui/src/widgets.rs, which is outlined and filled" },
 ]
+cognitive-complexity-threshold = 30
 
 disallowed-types = [
     { path = "egui::ComboBox", reason = "use craft_ui::ComboBox: egui's combo box menu can't grow back while open (egui#5225)" },
diff --git a/xtask/Cargo.toml b/xtask/Cargo.toml
index 7a33bad87..028282e07 100644
--- a/xtask/Cargo.toml
+++ b/xtask/Cargo.toml
@@ -5,6 +5,9 @@ edition = "2024"
 publish = false
 license.workspace = true
 
+[lints]
+workspace = true
+
 [dependencies]
 pdfcraft-oracle = { workspace = true }
 pdfcraft-cos = { workspace = true }