diff --git a/packages/cli/package.json b/packages/cli/package.json
index 1bafad0f..e6961dc7 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@openrouter/spawn",
-  "version": "0.25.25",
+  "version": "0.25.26",
   "type": "module",
   "bin": {
     "spawn": "cli.js"
diff --git a/packages/cli/src/aws/aws.ts b/packages/cli/src/aws/aws.ts
index 425c05c2..2d96ec1d 100644
--- a/packages/cli/src/aws/aws.ts
+++ b/packages/cli/src/aws/aws.ts
@@ -1213,7 +1213,7 @@ export async function interactiveSession(cmd: string): Promise<number> {
     throw new Error("Invalid command: must be non-empty and must not contain null bytes");
   }
   const term = sanitizeTermValue(process.env.TERM || "xterm-256color");
-  const fullCmd = `export TERM='${term}' PATH="$HOME/.npm-global/bin:$HOME/.claude/local/bin:$HOME/.local/bin:$HOME/.bun/bin:$PATH" && exec bash -l -c ${shellQuote(cmd)}`;
+  const fullCmd = `export TERM='${term}' LANG='C.UTF-8' PATH="$HOME/.npm-global/bin:$HOME/.claude/local/bin:$HOME/.local/bin:$HOME/.bun/bin:$PATH" && exec bash -l -c ${shellQuote(cmd)}`;
   const keyOpts = getSshKeyOpts(await ensureSshKeys());
   const exitCode = spawnInteractive([
     "ssh",
diff --git a/packages/cli/src/digitalocean/digitalocean.ts b/packages/cli/src/digitalocean/digitalocean.ts
index b8031290..49eb58e8 100644
--- a/packages/cli/src/digitalocean/digitalocean.ts
+++ b/packages/cli/src/digitalocean/digitalocean.ts
@@ -1471,7 +1471,7 @@ export async function interactiveSession(cmd: string, ip?: string): Promise<numb
   }
   const serverIp = ip || _state.serverIp;
   const term = sanitizeTermValue(process.env.TERM || "xterm-256color");
-  const fullCmd = `export TERM='${term}' PATH="$HOME/.npm-global/bin:$HOME/.claude/local/bin:$HOME/.local/bin:$HOME/.bun/bin:$PATH" && exec bash -l -c ${shellQuote(cmd)}`;
+  const fullCmd = `export TERM='${term}' LANG='C.UTF-8' PATH="$HOME/.npm-global/bin:$HOME/.claude/local/bin:$HOME/.local/bin:$HOME/.bun/bin:$PATH" && exec bash -l -c ${shellQuote(cmd)}`;
   const keyOpts = getSshKeyOpts(await ensureSshKeys());
 
   const exitCode = spawnInteractive([
diff --git a/packages/cli/src/gcp/gcp.ts b/packages/cli/src/gcp/gcp.ts
index ceb8bf78..4feef7e6 100644
--- a/packages/cli/src/gcp/gcp.ts
+++ b/packages/cli/src/gcp/gcp.ts
@@ -1107,7 +1107,7 @@ export async function interactiveSession(cmd: string): Promise<number> {
   const username = resolveUsername();
   const term = sanitizeTermValue(process.env.TERM || "xterm-256color");
   // Use shellQuote for consistent single-quote escaping (prevents shell expansion of $variables in cmd)
-  const fullCmd = `export TERM='${term}' PATH="$HOME/.npm-global/bin:$HOME/.claude/local/bin:$HOME/.local/bin:$HOME/.bun/bin:$PATH" && exec bash -l -c ${shellQuote(cmd)}`;
+  const fullCmd = `export TERM='${term}' LANG='C.UTF-8' PATH="$HOME/.npm-global/bin:$HOME/.claude/local/bin:$HOME/.local/bin:$HOME/.bun/bin:$PATH" && exec bash -l -c ${shellQuote(cmd)}`;
   const keyOpts = getSshKeyOpts(await ensureSshKeys());
 
   const exitCode = spawnInteractive([
diff --git a/packages/cli/src/hetzner/hetzner.ts b/packages/cli/src/hetzner/hetzner.ts
index 58bc9816..142cc175 100644
--- a/packages/cli/src/hetzner/hetzner.ts
+++ b/packages/cli/src/hetzner/hetzner.ts
@@ -929,7 +929,7 @@ export async function interactiveSession(cmd: string, ip?: string): Promise<numb
   }
   const serverIp = ip || _state.serverIp;
   const term = sanitizeTermValue(process.env.TERM || "xterm-256color");
-  const fullCmd = `export TERM='${term}' PATH="$HOME/.npm-global/bin:$HOME/.claude/local/bin:$HOME/.local/bin:$HOME/.bun/bin:$PATH" && exec bash -l -c ${shellQuote(cmd)}`;
+  const fullCmd = `export TERM='${term}' LANG='C.UTF-8' PATH="$HOME/.npm-global/bin:$HOME/.claude/local/bin:$HOME/.local/bin:$HOME/.bun/bin:$PATH" && exec bash -l -c ${shellQuote(cmd)}`;
 
   const keyOpts = getSshKeyOpts(await ensureSshKeys());
 
diff --git a/packages/cli/src/shared/agent-setup.ts b/packages/cli/src/shared/agent-setup.ts
index 17d92426..251f87cd 100644
--- a/packages/cli/src/shared/agent-setup.ts
+++ b/packages/cli/src/shared/agent-setup.ts
@@ -109,7 +109,7 @@ async function installClaudeCode(runner: CloudRunner): Promise<void> {
     `if [ -f ~/.bash_profile ] && grep -q 'spawn:env\\|Claude Code PATH\\|spawn:path' ~/.bash_profile 2>/dev/null; then rm -f ~/.bash_profile; fi`,
     `if command -v claude >/dev/null 2>&1; then ${finalize}; exit 0; fi`,
     `echo "==> Installing Claude Code (method 1/2: curl installer)..."`,
-    "curl --proto '=https' -fsSL https://claude.ai/install.sh | bash || true",
+    "curl --proto '=https' -fsSL https://claude.ai/install.sh | bash >/dev/null 2>&1 || true",
     `export PATH="${claudePath}:$PATH"`,
     `if command -v claude >/dev/null 2>&1; then ${finalize}; exit 0; fi`,
     "if ! command -v node >/dev/null 2>&1; then export N_PREFIX=$HOME/.n; curl --proto '=https' -fsSL https://raw.githubusercontent.com/tj/n/master/bin/n | bash -s install 22 || true; export PATH=$N_PREFIX/bin:$PATH; fi",
diff --git a/packages/cli/src/shared/agents.ts b/packages/cli/src/shared/agents.ts
index 68ba5351..f7e8d65b 100644
--- a/packages/cli/src/shared/agents.ts
+++ b/packages/cli/src/shared/agents.ts
@@ -185,6 +185,8 @@ export function generateEnvConfig(pairs: string[]): string {
     "",
     "# [spawn:env]",
     "export IS_SANDBOX='1'",
+    "# UTF-8 locale — required for agent TUIs that use Unicode (e.g. Claude Code)",
+    "export LANG='C.UTF-8'",
     "# Ensure agent binaries are in PATH on reconnect",
     'export PATH="$HOME/.npm-global/bin:$HOME/.bun/bin:$HOME/.local/bin:$HOME/.cargo/bin:$HOME/.claude/local/bin:/usr/local/bin:$PATH"',
   ];