# Kiro CLI vs Prime Agent

> Prime Agent and Kiro CLI score within a point of each other on agent readiness, 60.5 (C) and 59.9 (C). Kiro CLI leads on schema & documentation and security & auth. Both do agent harness. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/kiro-cli-vs-prime-agent
- Markdown: https://www.anchorterminal.com/compare/kiro-cli-vs-prime-agent.md (~2,500 tokens)
- Slim: https://www.anchorterminal.com/compare/kiro-cli-vs-prime-agent.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/kiro-cli-vs-prime-agent.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-08

Prime Agent and Kiro CLI score within a point of each other on agent readiness, 60.5 (C) and 59.9 (C). Kiro CLI leads on schema & documentation and security & auth. Both do agent harness.

- Kiro CLI: grade C, 59.9/100, rank #370 of 629. Markdown https://www.anchorterminal.com/tools/kiro-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/kiro-cli.json
- Prime Agent: grade C, 60.5/100, rank #352 of 629. Markdown https://www.anchorterminal.com/tools/prime-agent.md · JSON https://www.anchorterminal.com/api/v1/tools/prime-agent.json

## 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:
- Schema & documentation, 79 against 42
- Security & auth, 66 against 50

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

### Prime Agent (C)

Good for: Long-running research and coding work where one model drives subagents, schedules and goals from code, and where the owner can isolate the machine.

Ahead on:
- Reliability, 65 against 57
- Agent ergonomics, 73 against 67
- Payments & pricing, 60 against 40
- Maintenance & community, 79 against 73

Also in its favour:
- No key needed to call it
- Open source
- No incidents deducted, where Kiro CLI loses 4 points for them

Watch for: No approval prompts and no sandbox. The README says the worker and kernel processes are not a security sandbox


## Score by category

| Category | Weight | Kiro CLI | Prime Agent | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 57 | 65 | Prime Agent +8 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 79 | 42 | Kiro CLI +37 |
| Agent ergonomics | 13% (16.2 this run) | 67 | 73 | Prime Agent +6 |
| Security & auth | 14% (17.5 this run) | 66 | 50 | Kiro CLI +16 |
| Payments & pricing | 10% (12.5 this run) | 40 | 60 | Prime Agent +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 73 | 79 | Prime Agent +6 |
| Transparency & trust | 7% (8.8 this run) | 67 | 64 | Kiro CLI +3 |
| Negative events | ≤15 | -4 | 0 | |
| **Total** | | **59.9 · C** | **60.5 · C** | |

## Facts side by side

| Fact | Kiro CLI | Prime Agent |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Amazon Web Services | Prime Intellect |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | OAuth or key | None |
| Pricing | Freemium | Free |
| 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 | MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-10-05 | 2026-10-07 |
| Terms last updated | 2026-08-14 | no date given |
| Privacy policy last updated | 2026-05-18 | no date given |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | yes | yes |
| Popularity | 4.4k stars | 22k stars |

## 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.

**Prime Agent.** Budgets for turns, tokens and time bound an autonomous run, and sessions survive a closed terminal through a supervising daemon. Model-written Python and shell commands run with the user's rights, with no approval step and no sandbox, and the Rust build on the main branch ships only as nightly betas.

## 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

### Prime Agent

1. Run it in a disposable clone, container or VM. It executes model-written Python and shell commands with the user's rights and asks nothing first
2. Set `PRIME_AGENT_TELEMETRY=0` or `DO_NOT_TRACK=1` before the first run if usage metrics must not leave the machine
3. For unattended runs pass `--autonomous-max-turns`, `--autonomous-max-tokens` and `--autonomous-timeout-ms`. Reaching a limit does not mean the task succeeded
4. Headless use is `-p` with `--mode json` per the argument parser. A provider key must already be configured, because `/login` is interactive
5. The `-t/--tools`, `-nt/--no-tools` and `-nbt/--no-builtin-tools` flags were removed and now fail as unknown options

## Questions

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

Prime Agent and Kiro CLI score within a point of each other on agent readiness, 60.5 (C) and 59.9 (C). Kiro CLI leads on schema & documentation and security & auth.

### Are Kiro CLI and Prime Agent open source?

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


## For agents

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

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