diff --git a/Dockerfile b/Dockerfile
index fdb14e2a..3f1c1125 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,7 +8,7 @@ RUN touch src/main.rs && cargo build --release
 
 # --- Runtime stage ---
 FROM debian:bookworm-slim
-RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates curl unzip && rm -rf /var/lib/apt/lists/*
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates curl procps unzip && rm -rf /var/lib/apt/lists/*
 
 # Install kiro-cli (auto-detect arch, copy binary directly)
 RUN ARCH=$(dpkg --print-architecture) && \
diff --git a/Dockerfile.claude b/Dockerfile.claude
index 2c8b90ab..795a2ac9 100644
--- a/Dockerfile.claude
+++ b/Dockerfile.claude
@@ -8,7 +8,7 @@ RUN touch src/main.rs && cargo build --release
 
 # --- Runtime stage ---
 FROM node:22-bookworm-slim
-RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates curl && rm -rf /var/lib/apt/lists/*
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates curl procps && rm -rf /var/lib/apt/lists/*
 
 # Install claude-agent-acp adapter and Claude Code CLI
 RUN npm install -g @agentclientprotocol/claude-agent-acp@0.25.0 @anthropic-ai/claude-code --retry 3
diff --git a/Dockerfile.codex b/Dockerfile.codex
index b7ab4921..50024ff4 100644
--- a/Dockerfile.codex
+++ b/Dockerfile.codex
@@ -8,7 +8,7 @@ RUN touch src/main.rs && cargo build --release
 
 # --- Runtime stage ---
 FROM node:22-bookworm-slim
-RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates curl && rm -rf /var/lib/apt/lists/*
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates curl procps && rm -rf /var/lib/apt/lists/*
 
 # Pre-install codex-acp and codex CLI globally
 RUN npm install -g @zed-industries/codex-acp@0.9.5 @openai/codex --retry 3
diff --git a/Dockerfile.gemini b/Dockerfile.gemini
index a5ce9201..164586d2 100644
--- a/Dockerfile.gemini
+++ b/Dockerfile.gemini
@@ -8,7 +8,7 @@ RUN touch src/main.rs && cargo build --release
 
 # --- Runtime stage ---
 FROM node:22-bookworm-slim
-RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates curl && rm -rf /var/lib/apt/lists/*
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates curl procps && rm -rf /var/lib/apt/lists/*
 
 # Install Gemini CLI (native ACP support via --acp)
 RUN npm install -g @google/gemini-cli --retry 3