Why it ranks
How the rank works- went through YCProgram · this site+4
- team of 2Team size · YC's directory+2.5
A sum of public facts, not a judgement and not investment advice.
Competitors
| Company | Category | Status | Program |
|---|---|---|---|
| AI | Not stated | speedrunSR002 |
Adjacent
| Company | Category | Status | Program |
|---|---|---|---|
| AI, Devtools | Active | YCS26 | |
| Other | Not stated | Seedcamp2023 | |
| AI, Devtools | Active | YCF26 | |
| AI | Active | YCS25 | |
| AI, Data, Devtools | Inactive | YCS23 |
Also from F26 in AI
All of F26| Company | Category | Status |
|---|---|---|
| AI, Devtools | Active | |
| AI, Devtools | Active | |
| AI, Devtools | Active | |
| Alkera AIReliable and safe data engineering and data science agentsteam of 3ActiveAI, Data, Devtools | AI, Data, Devtools | Active |
| AI, Devtools | Active | |
| AI, Devtools | Active |
Founders
- Aryan SinghalFounder/CEO
About Mirrors
Production AI agents keep making the same mistakes. The usual fix is another line in the system prompt. Over time, the agent carries instructions for dozens of situations, even when it's doing something simple, and every correction becomes another thing to maintain. Mirrors helps developers maintain production agents by turning recurring mistakes into targeted corrections. Mirrors surfaces recurring mistakes across your production runs. You write a correction, choose the situations where it applies, and preview which past conversations it would have reached. Once activated, Mirrors adds it to your agent only in those situations. You can then compare outcomes with and without the correction to see whether it helped. Unlike skills, the agent doesn't decide what to load. The scope you set does. Corrections live in one place, scoped to the right accounts and workflows. Mirrors connects through an SDK and works with any agent framework, and your application keeps control of its model calls and tools. We're building Mirrors for engineering teams running customer-facing agents.
- YC batch
- F26 · Fall 2026
- Status, per YC
- Active
- Category
- AI, Developer tools
- Team size
- 2
- Location
- San Francisco, CA, USA
- Founded
- 2026
- Checked
- 6h ago
YC tags: AIOps, Developer Tools, SaaS, B2B, AI
Changes seen
Newly tagged SaaS; no longer tagged Infrastructure.
Rewrote its one-liner; it read "Give AI agents the right context at the right moment"
Newly tagged Infrastructure; no longer tagged SaaS.
Rewrote its one-liner; it read "Steer AI agents in real time using lessons from production runs"
Moved its website from runmirrors.com to mirrors.dev.
Website link changed from https://www.runmirrors.com to https://www.mirrors.dev.
Newly tagged AI; no longer tagged Artificial Intelligence.
Rewrote its one-liner; it read "Fix your AI agent's errors at runtime, so they never happen twice"
Subindustry changed from B2B -> Infrastructure to B2B -> Engineering, Product and Design.
Mirrors: questions
Which YC batch was Mirrors in?
Mirrors was in Y Combinator's Fall 2026 batch (F26).
Is Mirrors still active?
Y Combinator lists Mirrors as active.
Who founded Mirrors?
Mirrors's founders, as listed on its YC page: Aryan Singhal (Founder/CEO).
Where is Mirrors based?
Mirrors lists San Francisco, CA, USA as its location on YC's directory.