diff --git a/AGENTS.md b/AGENTS.md
index db3216b4e..4680c7143 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -11,6 +11,11 @@ In the codex-rs folder where the rust code lives:
 - Always collapse if statements per https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
 - Always inline format! args when possible per https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
 - Use method references over closures when possible per https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure_for_method_calls
+- Avoid bool or ambiguous `Option` parameters that force callers to write hard-to-read code such as `foo(false)` or `bar(None)`. Prefer enums, named methods, newtypes, or other idiomatic Rust API shapes when they keep the callsite self-documenting.
+- When you cannot make that API change and still need a small positional-literal callsite in Rust, follow the `argument_comment_lint` convention:
+  - Use an exact `/*param_name*/` comment before opaque literal arguments such as `None`, booleans, and numeric literals when passing them by position.
+  - Do not add these comments for string or char literals unless the comment adds real clarity; those literals are intentionally exempt from the lint.
+  - If you add one of these comments, the parameter name must exactly match the callee signature.
 - When possible, make `match` statements exhaustive and avoid wildcard arms.
 - When writing tests, prefer comparing the equality of entire objects over fields one by one.
 - When making a change that adds or changes an API, ensure that the documentation in the `docs/` folder is up to date if applicable.
diff --git a/justfile b/justfile
index 90f63c441..e32a96181 100644
--- a/justfile
+++ b/justfile
@@ -86,6 +86,11 @@ write-app-server-schema *args:
 write-hooks-schema:
     cargo run --manifest-path ./codex-rs/Cargo.toml -p codex-hooks --bin write_hooks_schema_fixtures
 
+# Run the argument-comment Dylint checks across codex-rs.
+[no-cd]
+argument-comment-lint *args:
+    ./tools/argument-comment-lint/run.sh "$@"
+
 # Tail logs from the state SQLite database
 log *args:
     if [ "${1:-}" = "--" ]; then shift; fi; cargo run -p codex-state --bin logs_client -- "$@"
diff --git a/tools/argument-comment-lint/.cargo/config.toml b/tools/argument-comment-lint/.cargo/config.toml
new file mode 100644
index 000000000..226eca535
--- /dev/null
+++ b/tools/argument-comment-lint/.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/argument-comment-lint/.gitignore b/tools/argument-comment-lint/.gitignore
new file mode 100644
index 000000000..ea8c4bf7f
--- /dev/null
+++ b/tools/argument-comment-lint/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/tools/argument-comment-lint/Cargo.lock b/tools/argument-comment-lint/Cargo.lock
new file mode 100644
index 000000000..1795ff683
--- /dev/null
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diff --git a/tools/argument-comment-lint/Cargo.toml b/tools/argument-comment-lint/Cargo.toml
new file mode 100644
index 000000000..e4b24694d
--- /dev/null
+++ b/tools/argument-comment-lint/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "argument_comment_lint"
+version = "0.1.0"
+description = "Dylint lints for Rust /*param*/ argument comments"
+edition = "2024"
+publish = false
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "20ce69b9a63bcd2756cd906fe0964d1e901e042a" }
+dylint_linting = "5.0.0"
+
+[dev-dependencies]
+dylint_testing = "5.0.0"
+
+[workspace]
+
+[package.metadata.rust-analyzer]
+rustc_private = true
diff --git a/tools/argument-comment-lint/README.md b/tools/argument-comment-lint/README.md
new file mode 100644
index 000000000..d806b6dee
--- /dev/null
+++ b/tools/argument-comment-lint/README.md
@@ -0,0 +1,104 @@
+# argument-comment-lint
+
+Isolated [Dylint](https://github.com/trailofbits/dylint) library for enforcing
+Rust argument comments in the exact `/*param*/` shape.
+
+Prefer self-documenting APIs over comment-heavy call sites when possible. If a
+call site would otherwise read like `foo(false)` or `bar(None)`, consider an
+enum, named helper, newtype, or another idiomatic Rust API shape first, and
+use an argument comment only when a smaller compatibility-preserving change is
+more appropriate.
+
+It provides two lints:
+
+- `argument_comment_mismatch` (`warn` by default): validates that a present
+  `/*param*/` comment matches the resolved callee parameter name.
+- `uncommented_anonymous_literal_argument` (`allow` by default): flags
+  anonymous literal-like arguments such as `None`, `true`, `false`, and numeric
+  literals when they do not have a preceding `/*param*/` comment.
+
+String and char literals are exempt because they are often already
+self-descriptive at the callsite.
+
+## Behavior
+
+Given:
+
+```rust
+fn create_openai_url(base_url: Option<String>, retry_count: usize) -> String {
+    let _ = (base_url, retry_count);
+    String::new()
+}
+```
+
+This is accepted:
+
+```rust
+create_openai_url(/*base_url*/ None, /*retry_count*/ 3);
+```
+
+This is warned on by `argument_comment_mismatch`:
+
+```rust
+create_openai_url(/*api_base*/ None, 3);
+```
+
+This is only warned on when `uncommented_anonymous_literal_argument` is enabled:
+
+```rust
+create_openai_url(None, 3);
+```
+
+## Development
+
+Install the required tooling once:
+
+```bash
+cargo install cargo-dylint dylint-link
+rustup toolchain install nightly-2025-09-18 \
+  --component llvm-tools-preview \
+  --component rustc-dev \
+  --component rust-src
+```
+
+Run the lint crate tests:
+
+```bash
+cd tools/argument-comment-lint
+cargo test
+```
+
+Run the lint against `codex-rs` from the repo root:
+
+```bash
+./tools/argument-comment-lint/run.sh -p codex-core
+just argument-comment-lint -p codex-core
+```
+
+If no package selection is provided, `run.sh` defaults to checking the
+`codex-rs` workspace with `--workspace --no-deps`.
+
+Repo runs also promote `uncommented_anonymous_literal_argument` to an error by
+default:
+
+```bash
+./tools/argument-comment-lint/run.sh -p codex-core
+```
+
+The wrapper does that by setting `DYLINT_RUSTFLAGS`, and it leaves an explicit
+existing setting alone. It also defaults `CARGO_INCREMENTAL=0` unless you have
+already set it, because the current nightly Dylint flow can otherwise hit a
+rustc incremental compilation ICE locally. To override that behavior for an ad
+hoc run:
+
+```bash
+DYLINT_RUSTFLAGS="-A uncommented_anonymous_literal_argument" \
+CARGO_INCREMENTAL=1 \
+  ./tools/argument-comment-lint/run.sh -p codex-core
+```
+
+To expand target coverage for an ad hoc run:
+
+```bash
+./tools/argument-comment-lint/run.sh -p codex-core -- --all-targets
+```
diff --git a/tools/argument-comment-lint/run.sh b/tools/argument-comment-lint/run.sh
new file mode 100755
index 000000000..9452a6a85
--- /dev/null
+++ b/tools/argument-comment-lint/run.sh
@@ -0,0 +1,91 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+lint_path="$repo_root/tools/argument-comment-lint"
+manifest_path="$repo_root/codex-rs/Cargo.toml"
+strict_lint="uncommented_anonymous_literal_argument"
+noise_lint="unknown_lints"
+
+has_manifest_path=false
+has_package_selection=false
+has_no_deps=false
+has_library_selection=false
+expect_value=""
+
+for arg in "$@"; do
+    if [[ -n "$expect_value" ]]; then
+        case "$expect_value" in
+            manifest_path)
+                has_manifest_path=true
+                ;;
+            package_selection)
+                has_package_selection=true
+                ;;
+            library_selection)
+                has_library_selection=true
+                ;;
+        esac
+        expect_value=""
+        continue
+    fi
+
+    case "$arg" in
+        --)
+            break
+            ;;
+        --manifest-path)
+            expect_value="manifest_path"
+            ;;
+        --manifest-path=*)
+            has_manifest_path=true
+            ;;
+        -p|--package)
+            expect_value="package_selection"
+            ;;
+        --package=*)
+            has_package_selection=true
+            ;;
+        --workspace)
+            has_package_selection=true
+            ;;
+        --no-deps)
+            has_no_deps=true
+            ;;
+        --lib|--lib-path)
+            expect_value="library_selection"
+            ;;
+        --lib=*|--lib-path=*)
+            has_library_selection=true
+            ;;
+    esac
+done
+
+cmd=(cargo dylint --path "$lint_path")
+if [[ "$has_library_selection" == false ]]; then
+    cmd+=(--all)
+fi
+if [[ "$has_manifest_path" == false ]]; then
+    cmd+=(--manifest-path "$manifest_path")
+fi
+if [[ "$has_package_selection" == false ]]; then
+    cmd+=(--workspace)
+fi
+if [[ "$has_no_deps" == false ]]; then
+    cmd+=(--no-deps)
+fi
+cmd+=("$@")
+
+if [[ "${DYLINT_RUSTFLAGS:-}" != *"$strict_lint"* ]]; then
+    export DYLINT_RUSTFLAGS="${DYLINT_RUSTFLAGS:+${DYLINT_RUSTFLAGS} }-D $strict_lint"
+fi
+if [[ "${DYLINT_RUSTFLAGS:-}" != *"$noise_lint"* ]]; then
+    export DYLINT_RUSTFLAGS="${DYLINT_RUSTFLAGS:+${DYLINT_RUSTFLAGS} }-A $noise_lint"
+fi
+
+if [[ -z "${CARGO_INCREMENTAL:-}" ]]; then
+    export CARGO_INCREMENTAL=0
+fi
+
+exec "${cmd[@]}"
diff --git a/tools/argument-comment-lint/rust-toolchain b/tools/argument-comment-lint/rust-toolchain
new file mode 100644
index 000000000..d159253fc
--- /dev/null
+++ b/tools/argument-comment-lint/rust-toolchain
@@ -0,0 +1,3 @@
+[toolchain]
+channel = "nightly-2025-09-18"
+components = ["llvm-tools-preview", "rustc-dev", "rust-src"]
diff --git a/tools/argument-comment-lint/src/comment_parser.rs b/tools/argument-comment-lint/src/comment_parser.rs
new file mode 100644
index 000000000..7ea66c195
--- /dev/null
+++ b/tools/argument-comment-lint/src/comment_parser.rs
@@ -0,0 +1,63 @@
+pub fn parse_argument_comment(text: &str) -> Option<&str> {
+    let trimmed = text.trim_end();
+    let comment_start = trimmed.rfind("/*")?;
+    let comment = &trimmed[comment_start..];
+    let name = comment.strip_prefix("/*")?.strip_suffix("*/")?;
+    is_identifier(name).then_some(name)
+}
+
+pub fn parse_argument_comment_prefix(text: &str) -> Option<&str> {
+    let trimmed = text.trim_start();
+    let comment = trimmed.strip_prefix("/*")?;
+    let (name, _) = comment.split_once("*/")?;
+    is_identifier(name).then_some(name)
+}
+
+fn is_identifier(text: &str) -> bool {
+    let mut chars = text.chars();
+    let Some(first) = chars.next() else {
+        return false;
+    };
+    if !(first == '_' || first.is_ascii_alphabetic()) {
+        return false;
+    }
+    chars.all(|ch| ch == '_' || ch.is_ascii_alphanumeric())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::parse_argument_comment;
+    use super::parse_argument_comment_prefix;
+
+    #[test]
+    fn parses_trailing_comment() {
+        assert_eq!(parse_argument_comment("(/*base_url*/ "), Some("base_url"));
+        assert_eq!(
+            parse_argument_comment(", /*timeout_ms*/ "),
+            Some("timeout_ms")
+        );
+        assert_eq!(
+            parse_argument_comment(".method::<u8>(/*base_url*/ "),
+            Some("base_url")
+        );
+    }
+
+    #[test]
+    fn rejects_non_matching_shapes() {
+        assert_eq!(parse_argument_comment("(\n"), None);
+        assert_eq!(parse_argument_comment("(/* base_url*/ "), None);
+        assert_eq!(parse_argument_comment("(/*base_url */ "), None);
+        assert_eq!(parse_argument_comment("(/*base_url=*/ "), None);
+        assert_eq!(parse_argument_comment("(/*1base_url*/ "), None);
+        assert_eq!(parse_argument_comment_prefix("/*env=*/ None"), None);
+    }
+
+    #[test]
+    fn parses_prefix_comment() {
+        assert_eq!(parse_argument_comment_prefix("/*env*/ None"), Some("env"));
+        assert_eq!(
+            parse_argument_comment_prefix("\n    /*retry_count*/ 3"),
+            Some("retry_count")
+        );
+    }
+}
diff --git a/tools/argument-comment-lint/src/lib.rs b/tools/argument-comment-lint/src/lib.rs
new file mode 100644
index 000000000..fcd3f1bcd
--- /dev/null
+++ b/tools/argument-comment-lint/src/lib.rs
@@ -0,0 +1,273 @@
+#![feature(rustc_private)]
+
+mod comment_parser;
+
+extern crate rustc_ast;
+extern crate rustc_errors;
+extern crate rustc_hir;
+extern crate rustc_lint;
+extern crate rustc_middle;
+extern crate rustc_session;
+extern crate rustc_span;
+
+use clippy_utils::diagnostics::span_lint_and_help;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::fn_def_id;
+use clippy_utils::is_res_lang_ctor;
+use clippy_utils::peel_blocks;
+use clippy_utils::source::snippet;
+use rustc_ast::LitKind;
+use rustc_errors::Applicability;
+use rustc_hir::Expr;
+use rustc_hir::ExprKind;
+use rustc_hir::LangItem;
+use rustc_hir::UnOp;
+use rustc_hir::def::DefKind;
+use rustc_lint::LateContext;
+use rustc_lint::LateLintPass;
+use rustc_span::BytePos;
+use rustc_span::Span;
+
+use crate::comment_parser::parse_argument_comment;
+use crate::comment_parser::parse_argument_comment_prefix;
+
+dylint_linting::dylint_library!();
+
+#[unsafe(no_mangle)]
+pub fn register_lints(_sess: &rustc_session::Session, lint_store: &mut rustc_lint::LintStore) {
+    lint_store.register_lints(&[
+        ARGUMENT_COMMENT_MISMATCH,
+        UNCOMMENTED_ANONYMOUS_LITERAL_ARGUMENT,
+    ]);
+    lint_store.register_late_pass(|_| Box::new(ArgumentCommentLint));
+}
+
+rustc_session::declare_lint! {
+    /// ### What it does
+    ///
+    /// Checks `/*param*/` argument comments and verifies that the comment
+    /// matches the resolved callee parameter name.
+    ///
+    /// ### Why is this bad?
+    ///
+    /// A mismatched comment is worse than no comment because it actively
+    /// misleads the reader.
+    ///
+    /// ### Known problems
+    ///
+    /// This lint only runs when the callee resolves to a concrete function or
+    /// method with available parameter names.
+    ///
+    /// ### Example
+    ///
+    /// ```rust
+    /// fn create_openai_url(base_url: Option<String>) -> String {
+    ///     String::new()
+    /// }
+    ///
+    /// create_openai_url(/*api_base*/ None);
+    /// ```
+    ///
+    /// Use instead:
+    ///
+    /// ```rust
+    /// fn create_openai_url(base_url: Option<String>) -> String {
+    ///     String::new()
+    /// }
+    ///
+    /// create_openai_url(/*base_url*/ None);
+    /// ```
+    pub ARGUMENT_COMMENT_MISMATCH,
+    Warn,
+    "argument comment does not match the resolved parameter name"
+}
+
+rustc_session::declare_lint! {
+    /// ### What it does
+    ///
+    /// Requires a `/*param*/` comment before anonymous literal-like
+    /// arguments such as `None`, booleans, and numeric literals.
+    ///
+    /// ### Why is this bad?
+    ///
+    /// Bare literal-like arguments make call sites harder to read because the
+    /// meaning of the value is hidden in the callee signature.
+    ///
+    /// ### Known problems
+    ///
+    /// This lint is opinionated, so it is `allow` by default.
+    ///
+    /// ### Example
+    ///
+    /// ```rust
+    /// fn create_openai_url(base_url: Option<String>) -> String {
+    ///     String::new()
+    /// }
+    ///
+    /// create_openai_url(None);
+    /// ```
+    ///
+    /// Use instead:
+    ///
+    /// ```rust
+    /// fn create_openai_url(base_url: Option<String>) -> String {
+    ///     String::new()
+    /// }
+    ///
+    /// create_openai_url(/*base_url*/ None);
+    /// ```
+    pub UNCOMMENTED_ANONYMOUS_LITERAL_ARGUMENT,
+    Allow,
+    "anonymous literal-like argument is missing a `/*param*/` comment"
+}
+
+#[derive(Default)]
+pub struct ArgumentCommentLint;
+
+rustc_session::impl_lint_pass!(
+    ArgumentCommentLint => [ARGUMENT_COMMENT_MISMATCH, UNCOMMENTED_ANONYMOUS_LITERAL_ARGUMENT]
+);
+
+impl<'tcx> LateLintPass<'tcx> for ArgumentCommentLint {
+    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
+        if expr.span.from_expansion() {
+            return;
+        }
+
+        match expr.kind {
+            ExprKind::Call(callee, args) => {
+                self.check_call(cx, expr, callee.span, args, 0);
+            }
+            ExprKind::MethodCall(_, receiver, args, _) => {
+                self.check_call(cx, expr, receiver.span, args, 1);
+            }
+            _ => {}
+        }
+    }
+}
+
+impl ArgumentCommentLint {
+    fn check_call<'tcx>(
+        &self,
+        cx: &LateContext<'tcx>,
+        call: &'tcx Expr<'tcx>,
+        first_gap_anchor: Span,
+        args: &'tcx [Expr<'tcx>],
+        parameter_offset: usize,
+    ) {
+        let Some(def_id) = fn_def_id(cx, call) else {
+            return;
+        };
+        if !def_id.is_local() && !is_workspace_crate_name(cx.tcx.crate_name(def_id.krate).as_str())
+        {
+            return;
+        }
+        if !matches!(cx.tcx.def_kind(def_id), DefKind::Fn | DefKind::AssocFn) {
+            return;
+        }
+
+        let parameter_names: Vec<_> = cx.tcx.fn_arg_idents(def_id).iter().copied().collect();
+        for (index, arg) in args.iter().enumerate() {
+            if arg.span.from_expansion() {
+                continue;
+            }
+
+            let Some(expected_name) = parameter_names.get(index + parameter_offset) else {
+                continue;
+            };
+            let Some(expected_name) = expected_name else {
+                continue;
+            };
+            let expected_name = expected_name.name.to_string();
+            if !is_meaningful_parameter_name(&expected_name) {
+                continue;
+            }
+
+            let boundary_span = if index == 0 {
+                first_gap_anchor
+            } else {
+                args[index - 1].span
+            };
+            let gap_span = boundary_span.between(arg.span);
+            let gap_text = snippet(cx, gap_span, "");
+            let arg_text = snippet(cx, arg.span, "..");
+            let lookbehind_start = BytePos(arg.span.lo().0.saturating_sub(64));
+            let lookbehind_text =
+                snippet(cx, arg.span.shrink_to_lo().with_lo(lookbehind_start), "");
+            let argument_comment = parse_argument_comment(gap_text.as_ref())
+                .or_else(|| parse_argument_comment(lookbehind_text.as_ref()))
+                .or_else(|| parse_argument_comment_prefix(arg_text.as_ref()));
+
+            if let Some(actual_name) = argument_comment {
+                if actual_name != expected_name {
+                    span_lint_and_help(
+                        cx,
+                        ARGUMENT_COMMENT_MISMATCH,
+                        arg.span,
+                        format!(
+                            "argument comment `/*{actual_name}*/` does not match parameter `{expected_name}`"
+                        ),
+                        None,
+                        format!("use `/*{expected_name}*/`"),
+                    );
+                }
+                continue;
+            }
+
+            if !is_anonymous_literal_like(cx, arg) {
+                continue;
+            }
+
+            span_lint_and_sugg(
+                cx,
+                UNCOMMENTED_ANONYMOUS_LITERAL_ARGUMENT,
+                arg.span,
+                format!("anonymous literal-like argument for parameter `{expected_name}`"),
+                "prepend the parameter name comment",
+                format!("/*{expected_name}*/ {arg_text}"),
+                Applicability::MachineApplicable,
+            );
+        }
+    }
+}
+
+fn is_anonymous_literal_like(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+    let expr = peel_blocks(expr);
+    match expr.kind {
+        ExprKind::Lit(lit) => !matches!(
+            lit.node,
+            LitKind::Str(..) | LitKind::ByteStr(..) | LitKind::CStr(..) | LitKind::Char(..)
+        ),
+        ExprKind::Unary(UnOp::Neg, inner) => matches!(peel_blocks(inner).kind, ExprKind::Lit(_)),
+        ExprKind::Path(qpath) => {
+            is_res_lang_ctor(cx, cx.qpath_res(&qpath, expr.hir_id), LangItem::OptionNone)
+        }
+        _ => false,
+    }
+}
+
+fn is_meaningful_parameter_name(name: &str) -> bool {
+    !name.is_empty() && !name.starts_with('_')
+}
+
+fn is_workspace_crate_name(name: &str) -> bool {
+    name.starts_with("codex_")
+        || matches!(
+            name,
+            "app_test_support" | "core_test_support" | "mcp_test_support"
+        )
+}
+
+#[test]
+fn ui() {
+    dylint_testing::ui_test(env!("CARGO_PKG_NAME"), "ui");
+}
+
+#[test]
+fn workspace_crate_filter_accepts_first_party_names_only() {
+    assert!(is_workspace_crate_name("codex_core"));
+    assert!(is_workspace_crate_name("codex_tui"));
+    assert!(is_workspace_crate_name("core_test_support"));
+    assert!(!is_workspace_crate_name("std"));
+    assert!(!is_workspace_crate_name("tokio"));
+}
diff --git a/tools/argument-comment-lint/ui/allow_char_literals.rs b/tools/argument-comment-lint/ui/allow_char_literals.rs
new file mode 100644
index 000000000..85ef7d362
--- /dev/null
+++ b/tools/argument-comment-lint/ui/allow_char_literals.rs
@@ -0,0 +1,9 @@
+#![warn(uncommented_anonymous_literal_argument)]
+
+fn split_top_level(body: &str, delimiter: char) {
+    let _ = (body, delimiter);
+}
+
+fn main() {
+    split_top_level("a|b|c", '|');
+}
diff --git a/tools/argument-comment-lint/ui/allow_string_literals.rs b/tools/argument-comment-lint/ui/allow_string_literals.rs
new file mode 100644
index 000000000..9d61c4a76
--- /dev/null
+++ b/tools/argument-comment-lint/ui/allow_string_literals.rs
@@ -0,0 +1,9 @@
+#![warn(uncommented_anonymous_literal_argument)]
+
+fn describe(prefix: &str, suffix: &str) {
+    let _ = (prefix, suffix);
+}
+
+fn main() {
+    describe("openai", r"https://api.openai.com/v1");
+}
diff --git a/tools/argument-comment-lint/ui/comment_matches.rs b/tools/argument-comment-lint/ui/comment_matches.rs
new file mode 100644
index 000000000..f582fb958
--- /dev/null
+++ b/tools/argument-comment-lint/ui/comment_matches.rs
@@ -0,0 +1,12 @@
+#![warn(argument_comment_mismatch)]
+
+fn create_openai_url(base_url: Option<String>, retry_count: usize) -> String {
+    let _ = (base_url, retry_count);
+    String::new()
+}
+
+fn main() {
+    let base_url = Some(String::from("https://api.openai.com"));
+    create_openai_url(base_url, 3);
+    create_openai_url(/*base_url*/ None, 3);
+}
diff --git a/tools/argument-comment-lint/ui/comment_matches_multiline.rs b/tools/argument-comment-lint/ui/comment_matches_multiline.rs
new file mode 100644
index 000000000..45683841f
--- /dev/null
+++ b/tools/argument-comment-lint/ui/comment_matches_multiline.rs
@@ -0,0 +1,15 @@
+#![warn(argument_comment_mismatch)]
+#![warn(uncommented_anonymous_literal_argument)]
+
+fn run_git_for_stdout(repo_root: &str, args: Vec<&str>, env: Option<&str>) -> String {
+    let _ = (repo_root, args, env);
+    String::new()
+}
+
+fn main() {
+    let _ = run_git_for_stdout(
+        "/tmp/repo",
+        vec!["rev-parse", "HEAD"],
+        /*env*/ None,
+    );
+}
diff --git a/tools/argument-comment-lint/ui/comment_mismatch.rs b/tools/argument-comment-lint/ui/comment_mismatch.rs
new file mode 100644
index 000000000..3eebdd9dc
--- /dev/null
+++ b/tools/argument-comment-lint/ui/comment_mismatch.rs
@@ -0,0 +1,10 @@
+#![warn(argument_comment_mismatch)]
+
+fn create_openai_url(base_url: Option<String>) -> String {
+    let _ = base_url;
+    String::new()
+}
+
+fn main() {
+    let _ = create_openai_url(/*api_base*/ None);
+}
diff --git a/tools/argument-comment-lint/ui/comment_mismatch.stderr b/tools/argument-comment-lint/ui/comment_mismatch.stderr
new file mode 100644
index 000000000..6ede65602
--- /dev/null
+++ b/tools/argument-comment-lint/ui/comment_mismatch.stderr
@@ -0,0 +1,15 @@
+warning: argument comment `/*api_base*/` does not match parameter `base_url`
+  --> $DIR/comment_mismatch.rs:9:44
+   |
+LL |     let _ = create_openai_url(/*api_base*/ None);
+   |                                            ^^^^
+   |
+   = help: use `/*base_url*/`
+note: the lint level is defined here
+  --> $DIR/comment_mismatch.rs:1:9
+   |
+LL | #![warn(argument_comment_mismatch)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
+
+warning: 1 warning emitted
+
diff --git a/tools/argument-comment-lint/ui/ignore_external_methods.rs b/tools/argument-comment-lint/ui/ignore_external_methods.rs
new file mode 100644
index 000000000..44c72707d
--- /dev/null
+++ b/tools/argument-comment-lint/ui/ignore_external_methods.rs
@@ -0,0 +1,9 @@
+#![warn(uncommented_anonymous_literal_argument)]
+
+fn main() {
+    let line = "{\"type\":\"response_item\"}";
+    let _ = line.starts_with('{');
+    let _ = line.find("type");
+    let parts = ["type", "response_item"];
+    let _ = parts.join("\n");
+}
diff --git a/tools/argument-comment-lint/ui/uncommented_literal.rs b/tools/argument-comment-lint/ui/uncommented_literal.rs
new file mode 100644
index 000000000..a64804c78
--- /dev/null
+++ b/tools/argument-comment-lint/ui/uncommented_literal.rs
@@ -0,0 +1,18 @@
+#![warn(uncommented_anonymous_literal_argument)]
+
+struct Client;
+
+impl Client {
+    fn set_flag(&self, enabled: bool) {}
+}
+
+fn create_openai_url(base_url: Option<String>, retry_count: usize) -> String {
+    let _ = (base_url, retry_count);
+    String::new()
+}
+
+fn main() {
+    let client = Client;
+    let _ = create_openai_url(None, 3);
+    client.set_flag(true);
+}
diff --git a/tools/argument-comment-lint/ui/uncommented_literal.stderr b/tools/argument-comment-lint/ui/uncommented_literal.stderr
new file mode 100644
index 000000000..a1060ef69
--- /dev/null
+++ b/tools/argument-comment-lint/ui/uncommented_literal.stderr
@@ -0,0 +1,26 @@
+warning: anonymous literal-like argument for parameter `base_url`
+  --> $DIR/uncommented_literal.rs:16:31
+   |
+LL |     let _ = create_openai_url(None, 3);
+   |                               ^^^^ help: prepend the parameter name comment: `/*base_url*/ None`
+   |
+note: the lint level is defined here
+  --> $DIR/uncommented_literal.rs:1:9
+   |
+LL | #![warn(uncommented_anonymous_literal_argument)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+warning: anonymous literal-like argument for parameter `retry_count`
+  --> $DIR/uncommented_literal.rs:16:37
+   |
+LL |     let _ = create_openai_url(None, 3);
+   |                                     ^ help: prepend the parameter name comment: `/*retry_count*/ 3`
+
+warning: anonymous literal-like argument for parameter `enabled`
+  --> $DIR/uncommented_literal.rs:17:21
+   |
+LL |     client.set_flag(true);
+   |                     ^^^^ help: prepend the parameter name comment: `/*enabled*/ true`
+
+warning: 3 warnings emitted
+