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Canary
YC-backed independent tester for agent-written code: boots the change in a clean sandbox, has its own agent try to break every affected flow, and reports failures back to the coding agent or PR.
www.runcanary.ai/Active
Show HN 2026-09-24 (YC); @runcanary/cli 0.1.14 published 2026-09-25. (checked 2026-10-25)
In Agent guardrails
Where it stands apart
- How is the main thing licensed? open parts around a closed core (10% of 21 others)
- Can it run entirely on your own device or infrastructure, without the maker's servers? no, it needs the maker's servers (0% of 21 others)
- Do you need an account to use it? account required (24% of 21 others)
- Where does it mainly step in? outside the action path (inventory, records, or checks afterwards) (14% of 21 others)
- What mainly decides whether an action is allowed? a model or classifier judging the action (0% of 21 others)
- If the guard itself breaks, is missing, or cannot decide, what happens by default? not applicable: it is not in the action path (6% of 17 others)
- What is the main thing it protects? the truth of the record (what the agent did or claimed) (10% of 21 others)
What it shares with most of the community
- Is it actively maintained? active (81% of 21 others)
- How is it mainly sustained? company with a paid product, tier, or ads (50% of 20 others)
- Who is it for? developers (90% of 21 others)
- Which agents does it work with? any agent or process (not limited to a named list) (71% of 21 others)
- In the default setup, where does the agent's work actually execute? directly on the host machine, as usual (52% of 21 others)
- Does it control the agent's outbound network access? no (56% of 16 others)
- What is it mainly for? adding checkpoints, review, or evidence (52% of 21 others)
- Is enforcement kept out of the agent's reach? yes, enforced in code or infrastructure the agent cannot change (95% of 21 others)
Nearest neighbors
- numbat (Perplexity) 59% of 17 shared answers match
- OpenAPPA 53% of 15 shared answers match
- Conduct 53% of 17 shared answers match
Every answer
| Question | Answer | Source |
|---|---|---|
| Is it actively maintained? | active | source 2026-10-25 |
| How is the main thing licensed? | stands apart open parts around a closed core CLI is Apache-2.0; the testing service is closed. | source 2026-10-25 |
| How is it mainly sustained? | company with a paid product, tier, or ads YC company; sales-led ('Book a call'). | source 2026-10-25 |
| Can it run entirely on your own device or infrastructure, without the maker's servers? | stands apart no, it needs the maker's servers | source 2026-10-25 |
| Do you need an account to use it? | stands apart account required Hosted testing service with Log in and onboarding via CLI; closed service needs a Canary account. | source 2026-10-26 |
| Who is it for? | developers | source 2026-10-25 |
| Which shared standard or format does it mainly build on? | none of these (its own format or interface) Own hosted testing service. | source 2026-10-26 |
| Where does it mainly step in? | stands apart outside the action path (inventory, records, or checks afterwards) Checks a change after the agent writes it, before merge. | source 2026-10-25 |
| What mainly decides whether an action is allowed? | stands apart a model or classifier judging the action An AI tester decides whether the change holds up. | source 2026-10-25 |
| If the guard itself breaks, is missing, or cannot decide, what happens by default? | stands apart not applicable: it is not in the action path | source 2026-10-25 |
| Which agents does it work with? | any agent or process (not limited to a named list) Claude Code, Codex, Cursor 'and any of your agents'. | source 2026-10-25 |
| In the default setup, where does the agent's work actually execute? | directly on the host machine, as usual The coding agent works as usual; Canary's tests run in its own cloud sandbox. | source 2026-10-25 |
| What is the main thing it protects? | stands apart the truth of the record (what the agent did or claimed) Whether 'done, tests pass' is true. | source 2026-10-25 |
| Does it keep a record of agent actions? | yes, ordinary logs or a timeline Reports per run. | source 2026-10-25 |
| Does it control the agent's outbound network access? | no | source 2026-10-25 |
| What is it mainly for? | adding checkpoints, review, or evidence | source 2026-10-25 |
| Is enforcement kept out of the agent's reach? | yes, enforced in code or infrastructure the agent cannot change | source 2026-10-25 |
Sources
This page was derived from:
- Package registry · www.npmjs.com/package/@runcanary/cli · read 2026-10-25
- Web page · www.runcanary.ai/ · read 2026-10-25
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