diff --git a/Cargo.toml b/Cargo.toml
index e0f471fb3..91e325bab 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -60,6 +60,7 @@ members = [
   "fuzz",
   "logger-cli",
 ]
+exclude = ["tools/dylints"]
 resolver = "2"
 
 [workspace.dependencies]
diff --git a/Makefile b/Makefile
index aa9102b7e..bf3111226 100644
--- a/Makefile
+++ b/Makefile
@@ -12,6 +12,13 @@ setup:
 clippy: setup
 	ci/check_license.sh
 	SKIP_PROTO_GEN=1 SKIP_FILE_GEN=1 cargo clippy --workspace --bins --examples --tests -- --no-deps
+	$(MAKE) dylint
+
+.PHONY: dylint
+dylint:
+	command -v cargo-dylint >/dev/null || cargo install cargo-dylint --version 6.0.3 --locked
+	command -v dylint-link >/dev/null || cargo install dylint-link --version 6.0.3 --locked
+	cargo dylint --all -- --workspace --all-targets
 
 # Leaving the below loop around to help with debugging flakes if needed.
 .PHONY: test
diff --git a/ci/license_header.py b/ci/license_header.py
index 07529e07a..1a3d6447f 100644
--- a/ci/license_header.py
+++ b/ci/license_header.py
@@ -21,6 +21,7 @@
     './fuzz/corpus/',
     './proto/',
     './target/',
+    './tools/dylints/target/',
     './thirdparty/',
 )
 
@@ -50,7 +51,10 @@ def check_file(file_path: str):
 
         if (file_path.endswith('Cargo.toml') and
             not file_path == './Cargo.toml' and
-                not 'license-file = "../LICENSE"' in content):
+            '[package]' in content and
+            not ('license-file = "../LICENSE"' in content or
+                 (file_path.startswith('./tools/dylints/') and
+                  'license-file = "../../../LICENSE"' in content))):
             raise Exception(
                 f'license-file = "../LICENSE" not found in {file_path}')
 
diff --git a/dylint.toml b/dylint.toml
new file mode 100644
index 000000000..84dfebb26
--- /dev/null
+++ b/dylint.toml
@@ -0,0 +1,2 @@
+[workspace.metadata.dylint]
+libraries = [{ path = "tools/dylints", pattern = "mutex_lock_must_unwrap" }]
diff --git a/tools/dylints/Cargo.lock b/tools/dylints/Cargo.lock
new file mode 100644
index 000000000..5a840c8c8
--- /dev/null
+++ b/tools/dylints/Cargo.lock
@@ -0,0 +1,1158 @@
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
+
+[[package]]
+name = "winnow"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23b97319f7b8343df12cc98938e5c3eb436064524c8d2b4e30a1d3a36eecdf81"
+
+[[package]]
+name = "xattr"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32e45ad4206f6d2479085147f02bc2ef834ac85886624a23575ae137c8aa8156"
+dependencies = [
+ "libc",
+ "rustix",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29666d0abbfad1e3dc4dcf6144730dd3a3ab225bbbdac83319345b1b44ccfc1b"
diff --git a/tools/dylints/Cargo.toml b/tools/dylints/Cargo.toml
new file mode 100644
index 000000000..3c123b841
--- /dev/null
+++ b/tools/dylints/Cargo.toml
@@ -0,0 +1,3 @@
+[workspace]
+members = ["mutex_lock_must_unwrap"]
+resolver = "2"
diff --git a/tools/dylints/mutex_lock_must_unwrap/.cargo/config.toml b/tools/dylints/mutex_lock_must_unwrap/.cargo/config.toml
new file mode 100644
index 000000000..226eca535
--- /dev/null
+++ b/tools/dylints/mutex_lock_must_unwrap/.cargo/config.toml
@@ -0,0 +1,6 @@
+[target.'cfg(all())']
+rustflags = ["-C", "linker=dylint-link"]
+
+# For Rust versions 1.74.0 and onward, the following alternative can be used
+# (see https://github.com/rust-lang/cargo/pull/12535):
+# linker = "dylint-link"
diff --git a/tools/dylints/mutex_lock_must_unwrap/.gitignore b/tools/dylints/mutex_lock_must_unwrap/.gitignore
new file mode 100644
index 000000000..ea8c4bf7f
--- /dev/null
+++ b/tools/dylints/mutex_lock_must_unwrap/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/tools/dylints/mutex_lock_must_unwrap/Cargo.toml b/tools/dylints/mutex_lock_must_unwrap/Cargo.toml
new file mode 100644
index 000000000..4f167f91c
--- /dev/null
+++ b/tools/dylints/mutex_lock_must_unwrap/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "mutex_lock_must_unwrap"
+version = "0.1.0"
+authors = ["bitdrift"]
+description = "Require std::sync::Mutex::lock() results to be immediately unwrapped"
+edition = "2024"
+license-file = "../../../LICENSE"
+publish = false
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "9fca3bc9fc2bc83c60bde26d18ed68f11564b228" }
+dylint_linting = "6.0"
+
+[dev-dependencies]
+dylint_testing = "6.0"
+
+[package.metadata.rust-analyzer]
+rustc_private = true
diff --git a/tools/dylints/mutex_lock_must_unwrap/README.md b/tools/dylints/mutex_lock_must_unwrap/README.md
new file mode 100644
index 000000000..65a60b596
--- /dev/null
+++ b/tools/dylints/mutex_lock_must_unwrap/README.md
@@ -0,0 +1,22 @@
+# `mutex_lock_must_unwrap`
+
+### What it does
+
+Requires every `std::sync::Mutex::lock()` call to be immediately followed by `unwrap()`.
+
+### Why is this bad?
+
+This codebase treats a poisoned standard mutex as a programming error. Continuing after poisoning
+can expose state left inconsistent by a panic while the mutex was held.
+
+### Example
+
+```rust
+let guard = mutex.lock().expect("mutex poisoned");
+```
+
+Use instead:
+
+```rust
+let guard = mutex.lock().unwrap();
+```
diff --git a/tools/dylints/mutex_lock_must_unwrap/rust-toolchain b/tools/dylints/mutex_lock_must_unwrap/rust-toolchain
new file mode 100644
index 000000000..39b925b85
--- /dev/null
+++ b/tools/dylints/mutex_lock_must_unwrap/rust-toolchain
@@ -0,0 +1,3 @@
+[toolchain]
+channel = "nightly-2026-05-28"
+components = ["llvm-tools-preview", "rustc-dev"]
diff --git a/tools/dylints/mutex_lock_must_unwrap/rustfmt.toml b/tools/dylints/mutex_lock_must_unwrap/rustfmt.toml
new file mode 100644
index 000000000..b196eaa2d
--- /dev/null
+++ b/tools/dylints/mutex_lock_must_unwrap/rustfmt.toml
@@ -0,0 +1 @@
+tab_spaces = 2
diff --git a/tools/dylints/mutex_lock_must_unwrap/src/lib.rs b/tools/dylints/mutex_lock_must_unwrap/src/lib.rs
new file mode 100644
index 000000000..c21d6fd1e
--- /dev/null
+++ b/tools/dylints/mutex_lock_must_unwrap/src/lib.rs
@@ -0,0 +1,105 @@
+// shared-core - bitdrift's common client/server libraries
+// Copyright Bitdrift, Inc. All rights reserved.
+//
+// Use of this source code is governed by a source available license that can be found in the
+// LICENSE file or at:
+// https://polyformproject.org/wp-content/uploads/2020/06/PolyForm-Shield-1.0.0.txt
+
+#![feature(rustc_private)]
+#![warn(unused_extern_crates)]
+
+extern crate rustc_hir;
+extern crate rustc_span;
+
+use clippy_utils::{
+  diagnostics::span_lint,
+  get_parent_expr,
+  res::MaybeDef,
+  sym::{lock, unwrap},
+};
+use rustc_hir::{Expr, ExprKind, def::Res};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_span::symbol::sym;
+
+dylint_linting::declare_late_lint! {
+  /// ### What it does
+  ///
+  /// Checks that `std::sync::Mutex::lock()` is immediately followed by `unwrap()`.
+  ///
+  /// ### Why is this bad?
+  ///
+  /// This workspace treats a poisoned standard mutex as a programming error. Handling its
+  /// `LockResult` in another way can accidentally continue with poisoned state.
+  ///
+  /// ### Example
+  ///
+  /// ```rust
+  /// # use std::sync::Mutex;
+  /// # let mutex = Mutex::new(());
+  /// let guard = mutex.lock().expect("mutex poisoned");
+  /// ```
+  ///
+  /// Use instead:
+  ///
+  /// ```rust
+  /// # use std::sync::Mutex;
+  /// # let mutex = Mutex::new(());
+  /// let guard = mutex.lock().unwrap();
+  /// ```
+  pub MUTEX_LOCK_MUST_UNWRAP,
+  Warn,
+  "`std::sync::Mutex::lock()` must be immediately unwrapped"
+}
+
+impl<'tcx> LateLintPass<'tcx> for MutexLockMustUnwrap {
+  fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+    if !is_std_mutex_lock(cx, expr) || is_immediately_unwrapped(cx, expr) {
+      return;
+    }
+
+    span_lint(
+      cx,
+      MUTEX_LOCK_MUST_UNWRAP,
+      expr.span,
+      "call `std::sync::Mutex::lock()` as `.lock().unwrap()`",
+    );
+  }
+}
+
+// Resolve the called associated function so aliases, deref coercions, and UFCS calls are handled
+// as consistently as ordinary method syntax.
+fn is_std_mutex_lock(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+  let method_def_id = match expr.kind {
+    ExprKind::MethodCall(method, ..) if method.ident.name == lock => {
+      cx.typeck_results().type_dependent_def_id(expr.hir_id)
+    }
+    ExprKind::Call(function, [_]) => match function.kind {
+      ExprKind::Path(path) => match cx.qpath_res(&path, function.hir_id) {
+        Res::Def(_, def_id) if cx.tcx.item_name(def_id) == lock => Some(def_id),
+        _ => None,
+      },
+      _ => None,
+    },
+    _ => None,
+  };
+
+  method_def_id
+    .and_then(|method_def_id| cx.tcx.impl_of_assoc(method_def_id))
+    .is_some_and(|impl_def_id| cx.tcx.type_of(impl_def_id).is_diag_item(cx, sym::Mutex))
+}
+
+fn is_immediately_unwrapped(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+  let Some(parent) = get_parent_expr(cx, expr) else {
+    return false;
+  };
+  let ExprKind::MethodCall(method, receiver, [], _) = parent.kind else {
+    return false;
+  };
+
+  method.ident.name == unwrap && receiver.hir_id == expr.hir_id
+}
+
+#[test]
+fn ui() {
+  dylint_testing::ui_test(env!("CARGO_PKG_NAME"), "ui");
+}
diff --git a/tools/dylints/mutex_lock_must_unwrap/ui/lock_with_expect.rs b/tools/dylints/mutex_lock_must_unwrap/ui/lock_with_expect.rs
new file mode 100644
index 000000000..3f83e56ff
--- /dev/null
+++ b/tools/dylints/mutex_lock_must_unwrap/ui/lock_with_expect.rs
@@ -0,0 +1,13 @@
+// shared-core - bitdrift's common client/server libraries
+// Copyright Bitdrift, Inc. All rights reserved.
+//
+// Use of this source code is governed by a source available license that can be found in the
+// LICENSE file or at:
+// https://polyformproject.org/wp-content/uploads/2020/06/PolyForm-Shield-1.0.0.txt
+
+use std::sync::Mutex;
+
+fn main() {
+    let mutex = Mutex::new(());
+    let _guard = mutex.lock().expect("mutex poisoned");
+}
diff --git a/tools/dylints/mutex_lock_must_unwrap/ui/lock_with_expect.stderr b/tools/dylints/mutex_lock_must_unwrap/ui/lock_with_expect.stderr
new file mode 100644
index 000000000..6b424754d
--- /dev/null
+++ b/tools/dylints/mutex_lock_must_unwrap/ui/lock_with_expect.stderr
@@ -0,0 +1,10 @@
+warning: call `std::sync::Mutex::lock()` as `.lock().unwrap()`
+  --> $DIR/lock_with_expect.rs:12:18
+   |
+LL |     let _guard = mutex.lock().expect("mutex poisoned");
+   |                  ^^^^^^^^^^^^
+   |
+   = note: `#[warn(mutex_lock_must_unwrap)]` on by default
+
+warning: 1 warning emitted
+
diff --git a/tools/dylints/mutex_lock_must_unwrap/ui/lock_without_unwrap.rs b/tools/dylints/mutex_lock_must_unwrap/ui/lock_without_unwrap.rs
new file mode 100644
index 000000000..3898bb692
--- /dev/null
+++ b/tools/dylints/mutex_lock_must_unwrap/ui/lock_without_unwrap.rs
@@ -0,0 +1,13 @@
+// shared-core - bitdrift's common client/server libraries
+// Copyright Bitdrift, Inc. All rights reserved.
+//
+// Use of this source code is governed by a source available license that can be found in the
+// LICENSE file or at:
+// https://polyformproject.org/wp-content/uploads/2020/06/PolyForm-Shield-1.0.0.txt
+
+use std::sync::Mutex;
+
+fn main() {
+    let mutex = Mutex::new(());
+    let _lock_result = mutex.lock();
+}
diff --git a/tools/dylints/mutex_lock_must_unwrap/ui/lock_without_unwrap.stderr b/tools/dylints/mutex_lock_must_unwrap/ui/lock_without_unwrap.stderr
new file mode 100644
index 000000000..25fcf288d
--- /dev/null
+++ b/tools/dylints/mutex_lock_must_unwrap/ui/lock_without_unwrap.stderr
@@ -0,0 +1,10 @@
+warning: call `std::sync::Mutex::lock()` as `.lock().unwrap()`
+  --> $DIR/lock_without_unwrap.rs:12:24
+   |
+LL |     let _lock_result = mutex.lock();
+   |                        ^^^^^^^^^^^^
+   |
+   = note: `#[warn(mutex_lock_must_unwrap)]` on by default
+
+warning: 1 warning emitted
+
diff --git a/tools/dylints/mutex_lock_must_unwrap/ui/main.rs b/tools/dylints/mutex_lock_must_unwrap/ui/main.rs
new file mode 100644
index 000000000..52ad8228f
--- /dev/null
+++ b/tools/dylints/mutex_lock_must_unwrap/ui/main.rs
@@ -0,0 +1,13 @@
+// shared-core - bitdrift's common client/server libraries
+// Copyright Bitdrift, Inc. All rights reserved.
+//
+// Use of this source code is governed by a source available license that can be found in the
+// LICENSE file or at:
+// https://polyformproject.org/wp-content/uploads/2020/06/PolyForm-Shield-1.0.0.txt
+
+use std::sync::Mutex;
+
+fn main() {
+    let mutex = Mutex::new(());
+    let _guard = mutex.lock().unwrap();
+}
diff --git a/tools/dylints/mutex_lock_must_unwrap/ui/non_std_mutex.rs b/tools/dylints/mutex_lock_must_unwrap/ui/non_std_mutex.rs
new file mode 100644
index 000000000..d6554cd46
--- /dev/null
+++ b/tools/dylints/mutex_lock_must_unwrap/ui/non_std_mutex.rs
@@ -0,0 +1,16 @@
+// shared-core - bitdrift's common client/server libraries
+// Copyright Bitdrift, Inc. All rights reserved.
+//
+// Use of this source code is governed by a source available license that can be found in the
+// LICENSE file or at:
+// https://polyformproject.org/wp-content/uploads/2020/06/PolyForm-Shield-1.0.0.txt
+
+struct Mutex;
+
+impl Mutex {
+    fn lock(&self) {}
+}
+
+fn main() {
+    Mutex.lock();
+}
diff --git a/tools/dylints/mutex_lock_must_unwrap/ui/ufcs_lock_without_unwrap.rs b/tools/dylints/mutex_lock_must_unwrap/ui/ufcs_lock_without_unwrap.rs
new file mode 100644
index 000000000..315b736c0
--- /dev/null
+++ b/tools/dylints/mutex_lock_must_unwrap/ui/ufcs_lock_without_unwrap.rs
@@ -0,0 +1,13 @@
+// shared-core - bitdrift's common client/server libraries
+// Copyright Bitdrift, Inc. All rights reserved.
+//
+// Use of this source code is governed by a source available license that can be found in the
+// LICENSE file or at:
+// https://polyformproject.org/wp-content/uploads/2020/06/PolyForm-Shield-1.0.0.txt
+
+use std::sync::Mutex;
+
+fn main() {
+  let mutex = Mutex::new(());
+  let _lock_result = Mutex::lock(&mutex);
+}
diff --git a/tools/dylints/mutex_lock_must_unwrap/ui/ufcs_lock_without_unwrap.stderr b/tools/dylints/mutex_lock_must_unwrap/ui/ufcs_lock_without_unwrap.stderr
new file mode 100644
index 000000000..18aa1bcbc
--- /dev/null
+++ b/tools/dylints/mutex_lock_must_unwrap/ui/ufcs_lock_without_unwrap.stderr
@@ -0,0 +1,10 @@
+warning: call `std::sync::Mutex::lock()` as `.lock().unwrap()`
+  --> $DIR/ufcs_lock_without_unwrap.rs:12:22
+   |
+LL |   let _lock_result = Mutex::lock(&mutex);
+   |                      ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(mutex_lock_must_unwrap)]` on by default
+
+warning: 1 warning emitted
+