diff --git a/crates/uv-static/src/env_vars.rs b/crates/uv-static/src/env_vars.rs
index 0c12fbd93..7d54ba266 100644
--- a/crates/uv-static/src/env_vars.rs
+++ b/crates/uv-static/src/env_vars.rs
@@ -644,4 +644,9 @@ impl EnvVars {
     /// error.
     #[attr_hidden]
     pub const UV_RUN_MAX_RECURSION_DEPTH: &'static str = "UV_RUN_MAX_RECURSION_DEPTH";
+
+    /// Overrides terminal width used for wrapping. This variable is not read by uv directly.
+    ///
+    /// This is a quasi-standard variable, described e.g. in `ncurses(3x)`.
+    pub const COLUMNS: &'static str = "COLUMNS";
 }
diff --git a/crates/uv/tests/it/common/mod.rs b/crates/uv/tests/it/common/mod.rs
index f34e7ca59..f55a6e963 100644
--- a/crates/uv/tests/it/common/mod.rs
+++ b/crates/uv/tests/it/common/mod.rs
@@ -562,7 +562,11 @@ impl TestContext {
         command
             // When running the tests in a venv, ignore that venv, otherwise we'll capture warnings.
             .env_remove(EnvVars::VIRTUAL_ENV)
+            // Disable wrapping of uv output for readability / determinism in snapshots.
             .env(EnvVars::UV_NO_WRAP, "1")
+            // While we disable wrapping in uv above, invoked tools may still wrap their output so
+            // we set a fixed `COLUMNS` value for isolation from terminal width.
+            .env(EnvVars::COLUMNS, "100")
             .env(EnvVars::PATH, path)
             .env(EnvVars::HOME, self.home_dir.as_os_str())
             .env(EnvVars::UV_PYTHON_INSTALL_DIR, "")
diff --git a/crates/uv/tests/it/tool_run.rs b/crates/uv/tests/it/tool_run.rs
index ede1f1871..9ca9146e3 100644
--- a/crates/uv/tests/it/tool_run.rs
+++ b/crates/uv/tests/it/tool_run.rs
@@ -1824,13 +1824,12 @@ fn tool_run_verbatim_name() {
         .arg("change_wheel_version")
         .arg("--help")
         .env(EnvVars::UV_TOOL_DIR, tool_dir.as_os_str())
-        .env(EnvVars::XDG_BIN_HOME, bin_dir.as_os_str()), @r###"
+        .env(EnvVars::XDG_BIN_HOME, bin_dir.as_os_str()), @r"
     success: true
     exit_code: 0
     ----- stdout -----
-    usage: change_wheel_version [-h] [--local-version LOCAL_VERSION]
-                                [--version VERSION] [--delete-old-wheel]
-                                [--allow-same-version]
+    usage: change_wheel_version [-h] [--local-version LOCAL_VERSION] [--version VERSION]
+                                [--delete-old-wheel] [--allow-same-version]
                                 wheel
 
     positional arguments:
@@ -1851,7 +1850,7 @@ fn tool_run_verbatim_name() {
      + installer==0.7.0
      + packaging==24.0
      + wheel==0.43.0
-    "###);
+    ");
 
     uv_snapshot!(context.filters(), context.tool_run()
         .arg("change-wheel-version")
@@ -1877,13 +1876,12 @@ fn tool_run_verbatim_name() {
         .arg("change_wheel_version")
         .arg("--help")
         .env(EnvVars::UV_TOOL_DIR, tool_dir.as_os_str())
-        .env(EnvVars::XDG_BIN_HOME, bin_dir.as_os_str()), @r###"
+        .env(EnvVars::XDG_BIN_HOME, bin_dir.as_os_str()), @r"
     success: true
     exit_code: 0
     ----- stdout -----
-    usage: change_wheel_version [-h] [--local-version LOCAL_VERSION]
-                                [--version VERSION] [--delete-old-wheel]
-                                [--allow-same-version]
+    usage: change_wheel_version [-h] [--local-version LOCAL_VERSION] [--version VERSION]
+                                [--delete-old-wheel] [--allow-same-version]
                                 wheel
 
     positional arguments:
@@ -1898,5 +1896,5 @@ fn tool_run_verbatim_name() {
 
     ----- stderr -----
     Resolved [N] packages in [TIME]
-    "###);
+    ");
 }
diff --git a/docs/configuration/environment.md b/docs/configuration/environment.md
index 432acb18f..99a5a375a 100644
--- a/docs/configuration/environment.md
+++ b/docs/configuration/environment.md
@@ -399,6 +399,12 @@ Used to detect Bash shell usage.
 
 Use to control color via `anstyle`.
 
+### `COLUMNS`
+
+Overrides terminal width used for wrapping. This variable is not read by uv directly.
+
+This is a quasi-standard variable, described e.g. in `ncurses(3x)`.
+
 ### `CONDA_DEFAULT_ENV`
 
 Used to determine if an active Conda environment is the base environment or not.