# Kiro CLI vs Muse Code

> Muse Code scores 61.3 (C) to Kiro CLI's 59.9 (C) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

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- Updated: 2026-10-12

Muse Code scores 61.3 (C) on agent readiness against Kiro CLI's 59.9 (C), and leads in 4 of 7 scored categories. Kiro CLI leads on reliability, payments & pricing and transparency & trust. Both do agent harnesses.

- Kiro CLI: grade C, 59.9/100, rank #550 of 993. Markdown https://www.anchorterminal.com/tools/kiro-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/kiro-cli.json
- Muse Code: grade C, 61.3/100, rank #487 of 993. Markdown https://www.anchorterminal.com/tools/muse-code.md · JSON https://www.anchorterminal.com/api/v1/tools/muse-code.json
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 226 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md

## Which one, for what

### Kiro CLI (C)

Good for: Teams on AWS that want one agent configuration across terminal, IDE and web, with central permission policy, prompt logging to their own S3 bucket and IAM Identity Centre sign-in.

Ahead on:
- Reliability, 57 against 45
- Payments & pricing, 40 against 20
- Transparency & trust, 67 against 57

Also in its favour:
- Free to start without a card

Watch for: Free and individual paid accounts have content used for service improvement, including model training, unless they opt out

### Muse Code (C)

Good for: Developers who want Meta's Muse models, Muse Wonder Full included, in a terminal or CI agent with the sandbox and approvals on from the first run.

Ahead on:
- Schema & documentation, 84 against 79
- Agent ergonomics, 79 against 67

Also in its favour:
- No incidents deducted, where Kiro CLI loses 4 points for them

Watch for: Closed source, with no public CI or issue tracker for the CLI found and release notes that carry no dates


## Score by category

| Category | Weight | Kiro CLI | Muse Code | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 57 | 45 | Kiro CLI +12 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 79 | 84 | Muse Code +5 |
| Agent ergonomics | 13% (16.2 this run) | 67 | 79 | Muse Code +12 |
| Security & auth | 14% (17.5 this run) | 66 | 67 | Muse Code +1 |
| Payments & pricing | 10% (12.5 this run) | 40 | 20 | Kiro CLI +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 73 | 75 | Muse Code +2 |
| Transparency & trust | 7% (8.8 this run) | 67 | 57 | Kiro CLI +10 |
| Negative events | ≤15 | -4 | 0 | |
| **Total** | | **59.9 · C** | **61.3 · C** | |

## Facts side by side

| Fact | Kiro CLI | Muse Code |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Amazon Web Services | Meta |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Proprietary. Licensed as AWS Content under the AWS Customer Agreement and the AWS Intellectual Property Licence (https://kiro.dev/license/). The GitHub repository is the public issue tracker and doesn't hold the source | Proprietary binary, used under the Meta Model API Terms of Service, which cover Meta's coding harness. Subscriptions are also under the Meta Subscription Terms of Service. The TypeScript and Python SDKs in the linked repository are MIT. |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| Last release | 2026-10-05 | 2026-10-11 |
| Terms last updated | 2026-08-14 |  |
| Privacy policy last updated | 2026-05-18 | couldn't be read |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | not found in the text |  |
| Terms restrict benchmarking | not found in the text |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | yes |  |
| Popularity | 4.4k stars | 63k npm/wk |

## Verdicts

**Kiro CLI.** Permission rules follow deny over ask over allow, cloned repositories can't add rules, and a headless session treats every ask as a deny. Content from Free and individual paid accounts is used for service improvement, including model training, unless the user opts out, and API keys for pipelines need a paid plan.

**Muse Code.** Muse Code runs with approvals and an OS sandbox on by default, per-host network approval, an append-only event log and a headless mode with documented exit codes. It is the only route to Muse Wonder Full. It is closed source with undated release notes and no free route, and subscriptions allow training on code unless Contributor mode is turned off.

## Before you call either

### Kiro CLI

1. Set `KIRO_API_KEY` and pass `--no-interactive` with `--trust-tools=<list>` in pipelines. Keep `--trust-all-tools` for disposable environments
2. Pass `--require-mcp-startup` when a run depends on MCP tools. Without it a failed server is logged and the run continues
3. Pass `--no-interactive` whenever input is piped from a source you don't control, and run 2.10.0 or later on Windows
4. Run `kiro-cli settings telemetry.enabled false` and turn off content collection on Free and individual plans. Both are on by default
5. Export variables in the shell before starting. Since 2.24.0 a project `.env` file is no longer loaded into sessions, MCP servers or tools

### Muse Code

1. Set `META_API_KEY` for headless runs. Browser sign-in isn't available in CI or for Meta Managed Accounts
2. Gate on your own test command, not the exit code. `muse exec` returns 0 when the turn completes even if tests still fail
3. Pass `--max-model-steps` on unattended runs so a stuck task can't loop
4. Prefer `--disable-approval` to `--yolo` in CI so the sandbox stays on. On Linux the runner needs a working bubblewrap and a non-musl build
5. Turn Contributor mode off in `/settings` before a subscription session touches private code

## Questions

### Which is better for AI agents, Kiro CLI or Muse Code?

Muse Code scores 61.3 (C) on agent readiness against Kiro CLI's 59.9 (C), and leads in 4 of 7 scored categories. Kiro CLI leads on reliability, payments & pricing and transparency & trust.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/kiro-cli-vs-muse-code.json, and with the fewest tokens: https://www.anchorterminal.com/compare/kiro-cli-vs-muse-code.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "kiro-cli", "b": "muse-code"}`. From a terminal: `anchor compare kiro-cli muse-code`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/kiro-cli.json and https://www.anchorterminal.com/api/v1/tools/muse-code.json

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