# Agent authentication — Cosmos Institute

**This service uses NO delegated auth. There is no OAuth, no token endpoint, and
no agent registration flow.**

cosmos-institute.org is a public, read-only informational website for a
501(c)(3) nonprofit. Every page an agent might want is served anonymously over
plain HTTPS `GET`. There is nothing to authenticate to, so we publish no OAuth
2.0 protected-resource metadata (RFC 9728) and no authorization-server metadata
(RFC 8414) — we have no authorization server to describe, and inventing one
would point agents at an endpoint that does not exist.

## How an agent should access this site

| | |
|---|---|
| Auth scheme | None. Anonymous HTTPS `GET`. |
| Register | Not applicable — no credentials are issued. |
| Token endpoint | `n/a` |
| Scopes | `n/a` |
| Rate limits | No hard limit. Please crawl politely (≈1 request/second) and send a descriptive `User-Agent`. |
| Identify yourself | Set a `User-Agent` naming your agent and an operator contact URL. |

## Machine-readable entry points

- Agent card — <https://cosmos-institute.org/.well-known/agent-card.json>
- Alignment card — <https://cosmos-institute.org/.well-known/alignment-card.json>
- Agent guidance — <https://cosmos-institute.org/agents.txt>
- LLM content index — <https://cosmos-institute.org/llms.txt>
- API catalog — <https://cosmos-institute.org/.well-known/api-catalog>
- Sitemap — <https://cosmos-institute.org/sitemap.xml>
- Crawl and training policy — <https://cosmos-institute.org/robots.txt>
- Security contact — <https://cosmos-institute.org/.well-known/security.txt>

## Content in Markdown

Request any page with `Accept: text/markdown` and we return a Markdown
rendering instead of HTML:

```
curl -H 'Accept: text/markdown' https://cosmos-institute.org/
```

## Usage terms

Reading, quoting, and citing our public writing is welcome, with attribution to
"Cosmos Institute" and a link to the source URL. Our `robots.txt` carries
`Content-Signal: search=yes, ai-input=yes, ai-train=no` — you may index and
ground answers on this content, but you may not use it to train or fine-tune
models. See `/.well-known/alignment-card.json` for the full statement.

Questions: info@cosmos-institute.org