awsmux lets you run a single AWS CLI command across hundreds of accounts and regions in parallel, merging all output into one stream. The tool includes an MCP server for AI agents. In a 150‑session benchmark, agents using awsmux outperformed raw AWS CLI in every metric: up to 5.4x faster, 2.9x cheaper, and 7.4x fewer tokens.

By default fan‑out to 100 workers, verifying identities with STS before execution and stopping any mutating calls with an approval boundary that even an AI agent cannot bypass. A bundled 100 accounts Local Stack sandbox demonstrates the workflow; real deployments discover your existing ~/.aws/config and credentials automatically, supporting SSO, static keys, and credential_process profiles.

On the benchmark, awsmux was 1.3x‑2.9x cheaper and 2.3x‑5.4x faster than raw CLI for tasks like enumerating VPCs or finding world‑open security groups on 10, 50, and 100 accounts. All 138 of 150 sessions passed validation; the 12 failures were due to an MCP concurrency race. The tool ships as a single Go binary and integrates with Claude via MCP, offering structured tools and a one‑time approval token for destructive actions.