# Pi vs Kiro CLI

> Pi scores 68.4 (B) on agent readiness against Kiro CLI's 59.9 (C), and leads in 5 of 7 scored categories. Kiro CLI leads on security & auth. Both do agent harness. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-08

Pi scores 68.4 (B) on agent readiness against Kiro CLI's 59.9 (C), and leads in 5 of 7 scored categories. Kiro CLI leads on security & auth. Both do agent harness.

- Pi: grade B, 68.4/100, rank #180 of 722. Markdown https://www.anchorterminal.com/tools/earendil-pi.md · JSON https://www.anchorterminal.com/api/v1/tools/earendil-pi.json
- Kiro CLI: grade C, 59.9/100, rank #419 of 722. Markdown https://www.anchorterminal.com/tools/kiro-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/kiro-cli.json

## Which one, for what

### Pi (B)

Good for: Developers and pipelines that want a small, scriptable coding agent they can extend in TypeScript and drive over JSONL or RPC, inside their own container.

Ahead on:
- Reliability, 75 against 57
- Schema & documentation, 84 against 79
- Agent ergonomics, 76 against 67
- Payments & pricing, 60 against 40
- Maintenance & community, 87 against 73

Also in its favour:
- No key needed to call it
- Open source

Watch for: No permission system or sandbox. Tool calls run with the user's rights and without an approval prompt

### 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:
- Security & auth, 66 against 61

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


## Score by category

| Category | Weight | Pi | Kiro CLI | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 75 | 57 | Pi +18 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 84 | 79 | Pi +5 |
| Agent ergonomics | 13% (16.2 this run) | 76 | 67 | Pi +9 |
| Security & auth | 14% (17.5 this run) | 61 | 66 | Kiro CLI +5 |
| Payments & pricing | 10% (12.5 this run) | 60 | 40 | Pi +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 87 | 73 | Pi +14 |
| Transparency & trust | 7% (8.8 this run) | 64 | 67 | Kiro CLI +3 |
| Negative events | ≤15 | -4 | -4 | |
| **Total** | | **68.4 · B** | **59.9 · C** | |

## Facts side by side

| Fact | Pi | Kiro CLI |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Earendil | Amazon Web Services |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | None | OAuth or key |
| Pricing | Free | Freemium |
| x402 | no | no |
| Licence | MIT | 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 |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2026-10-07 | 2026-10-05 |
| Terms last updated | no document linked | 2026-08-14 |
| Privacy policy last updated | no document linked | 2026-05-18 |
| 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 | 113k stars, 5.2M npm/wk | 4.4k stars |

## Verdicts

**Pi.** Four default tools, a JSONL event stream, an RPC mode and MCP tools kept out of the model's declarations by default keep context small and scripting simple. Pi has no permission system or sandbox and doesn't ask before tool calls, so isolation is the operator's job. Version 1.0.0 is dated 1 October 2026.

**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.

## Before you call either

### Pi

1. Run Pi inside a container or VM for unattended work. It has no sandbox and doesn't ask before running shell commands
2. Use `pi --mode json` and wait for `agent_settled`. A failed response doesn't set a nonzero exit code in JSON mode
3. Split the JSONL stream on LF only. Node's `readline` also splits on U+2028 and U+2029, which are valid inside JSON strings
4. Pass `--no-approve` or `--approve` in scripts to make the project trust decision explicit
5. Set `PI_TELEMETRY=0` and `PI_SKIP_VERSION_CHECK=1`, or `PI_OFFLINE=1`, to stop the default requests to pi.dev

### 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

## Questions

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

Pi scores 68.4 (B) on agent readiness against Kiro CLI's 59.9 (C), and leads in 5 of 7 scored categories. Kiro CLI leads on security & auth.

### Are Pi and Kiro CLI open source?

Pi is open source (MIT). No open-source release is listed for Kiro CLI.


## For agents

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

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