OpenCode Agent
Operated by OpenCode
Quick Facts
- User-Agent:
- opencode
- Category:
- AI & LLM Bots
- Operator:
- OpenCode
- Safety:
- Safe
- Blocking Impact:
- Low - No SEO ranking impact
- SEO Impact Score:
- 2/10
- Official docs:
- None published by OpenCode
Reported, not operator documented
OpenCode has not published a crawler page that names opencode. It is listed here on our own evidence. Verified by AI Crawler Check: 17 of the 5,583 valid robots.txt files in the Tranco top 10,000 carry a rule for opencode, so site owners treat it as a real crawler name (how we measure this). That proves the spelling is in use, not who sends it. Reported OpenCode agent fetches. No vendor UA published.
What that means for you: the opencode rule on this page is the best available spelling, but OpenCode has made no statement of purpose, crawl rate or robots.txt compliance. Treat a opencode request in your logs as a clue, not proof of who sent it, and add a firewall rule if that traffic matters to you. If the operator publishes documentation, this profile moves to Official docs.
What is OpenCode Agent?
OpenCode Agent is an on-demand AI fetcher operated by OpenCode. It retrieves a page only when a user explicitly asks an AI assistant or agent to read, summarize, or act on a specific URL. Because it is triggered by real user intent rather than bulk crawling, blocking it mainly prevents users from pulling your content into OpenCode's assistant.
OpenCode Agent is an on-demand AI fetcher operated by OpenCode. It retrieves a page only when a user explicitly asks an AI assistant or agent to read, summarize, or act on a specific URL. Because it is triggered by real user intent rather than bulk crawling, blocking it mainly prevents users from pulling your content into OpenCode's assistant.
OpenCode Agent uses the user-agent token opencode. You can control it via robots.txt, meta tags (noai), or the emerging llms.txt standard. Robots.txt is voluntary; for hard enforcement, combine it with server-level IP blocking.
What happens if you block OpenCode Agent?
User-agent / Disallow: / without any SEO penalty.Want to see whether OpenCode Agent actually visits you? Read how do I monitor AI bot traffic to my website?
How to block OpenCode Agent with robots.txt
<code>User-agent: opencode</code> - Matching is case-insensitive. Robots.txt is fetched from the root of each subdomain separately.
Is OpenCode Agent safe to allow?
What does OpenCode Agent do?
Understanding OpenCode Agent's purpose helps you decide whether to allow or block it.
- Fetches a page only when a user asks an AI assistant to read it
- Summarizes or extracts the URL the user provided
- Triggered by real user intent, not bulk crawling
- Low traffic volume compared with training crawlers
- Blocking it prevents users from pulling your content into the assistant
OpenCode Agent in context
OpenCode Agent is a user-triggered agent operated by OpenCode. In plain terms, it fetches a page when a person asks an assistant or app to open it. Our database files it under AI and LLM crawlers and ranks it Tier 3, mid-priority crawlers with a clear purpose but a smaller audience. 15 of the 104 AI and LLM crawlers in our database share this tier.
Its safety rating is safe and its blocking impact is low. So the decision about OpenCode Agent rests on what you want from OpenCode, not on its behaviour. How we rate safety and impact.
How site owners treat OpenCode Agent
In our own scan of the Tranco top 10,000 (5,583 valid robots.txt files), 17 files (0.3%) name opencode in a User-agent line. That shows site owners treat the token as a real crawler worth a rule. It does not, on its own, prove who operates it.
Does it follow robots.txt?
OpenCode Agent's operator does not clearly document how it treats robots.txt. Write the OpenCode Agent rule anyway, then confirm in your logs that its requests stop.
OpenCode crawlers and close alternatives
OpenCode runs only this one crawler in our database, so a single User-agent: opencode group controls everything OpenCode fetches through it.
Other AI and LLM crawlers that do the same job (fetches a page when a person asks an assistant or app to open it) include ChatGPT Agent from OpenAI, ChatGPT Operator from OpenAI, ChatGPT-User from OpenAI, ChatGPT-User/2.0 from OpenAI, Claude-SearchBot from Anthropic, Claude-User from Anthropic. Deciding about OpenCode Agent is usually a decision about the whole group, so check how your file treats these too.
We first recorded opencode on September 22, 2026. We could not find a page where OpenCode names it, so treat the token as reported rather than documented.
Which rule OpenCode Agent actually follows
OpenCode Agent reads exactly one group in robots.txt, the most specific one that names opencode, and never combines rules across groups. This short file shows the trap:
User-agent: *
Disallow: /private/
User-agent: opencode
Disallow: /drafts/- Find the group. OpenCode Agent looks for a group naming
opencode. One exists, so it ignoresUser-agent: *completely. - Apply only that group. It is refused
/drafts/and nothing else. - The surprise.
/private/is open to OpenCode Agent, because that rule lives in the*group it no longer reads. To keep it out of both, repeatDisallow: /private/inside its own group.
Test yourself: does a rule under User-agent: * apply to OpenCode Agent if the file also has a User-agent: opencode group?
No. Once a group names it, OpenCode Agent reads only that group. Put every rule you want it to follow inside its own group.
Related: how AI engines choose their sources
Test yourself: will blocking OpenCode Agent remove your pages from AI answers?
Often, yes. OpenCode Agent is a user-triggered agent, so pages it cannot fetch can drop out of the answers or results it supports.
Test yourself: is User-agent: opencode the same as User-agent: opencode?
Yes. RFC 9309 makes user-agent matching case-insensitive. Paths are a different story: Disallow: /Blog/ does not block /blog/.
Should you allow OpenCode Agent? Decide by situation
| If you are... | Recommended setting |
|---|---|
| You publish content and want AI answers to cite it | Allow it. OpenCode Agent fetches pages for answers, so blocking it can remove you from them. |
| You license content and want to stop AI training | Blocking it does not stop training, because OpenCode Agent is a user-triggered agent. Block the operator's training crawler instead. |
| You run an online shop | Allow it on product and category pages, which are the pages shoppers ask assistants about. |
| Your server is under load from bots | Rate-limit before blocking. It is rated safe in our database. |
Check OpenCode Agent on your own site
- Open
/robots.txton your domain and search foropencode. If it is not named, it followsUser-agent: *. - List the
Disallowlines in the group OpenCode Agent follows and test your key URLs against them; the longest match wins, andAllowwins a tie. - Look beyond the file. A firewall or bot manager can refuse OpenCode Agent even when robots.txt allows it, and that never shows in the file.
- Run our crawler access checker to see how OpenCode Agent and every other crawler we track are treated in one pass, including firewall refusals.
Common mistakes with OpenCode Agent
The errors we see most often with OpenCode Agent in the files and firewalls we test:
- Assuming a robots.txt rule will stop OpenCode Agent. User-triggered fetches act for a person, and some operators say robots.txt may not apply to them. Check the operator's statement above.
- Blocking OpenCode Agent as if it were a bulk crawler. It fetches one page because a person asked; blocking it means that person's assistant cannot read your page.
- Counting OpenCode Agent visits as crawl volume. Each request maps to a real user question, which makes the paths it requests a useful signal of what people ask about you.
All three hide inside a file that looks correct, so check OpenCode Agent from outside after every change.
Spotting OpenCode Agent in your logs
robots.txt says what OpenCode Agent may do; your access logs show what it actually did.
Count requests
On a server with standard Nginx or Apache logs, this counts matching requests per day (adjust the log path for your host):
grep -iE "opencode" /var/log/nginx/access.log \
| awk '{print $4}' | cut -d: -f1 | sort | uniq -cAnd this shows which paths it requested most, which is the quickest way to see whether your Disallow lines are being respected:
grep -iE "opencode" /var/log/nginx/access.log \
| awk '{print $7}' | sort | uniq -c | sort -rn | head -20Check the requests are genuine
Anyone can send the OpenCode Agent user-agent, so confirm the source before acting on a match:
opencode: we hold no published IP list, so use reverse DNS where the operator documents a hostname and treat an unverifiable OpenCode Agent request with caution.
Frequently Asked Questions
What user-agent string does OpenCode Agent use?
opencode. Evidence that the spelling is in real use comes from our own robots.txt study: 17 of the 5,583 valid robots.txt files in the Tranco top 10,000 name it (fetched October 20, 2026), not from OpenCode, which has not published crawler documentation naming it. Use it in robots.txt as the best available match, and treat a request carrying it as a clue rather than proof of who sent it.Is OpenCode Agent safe?
Will blocking OpenCode Agent hurt my SEO?
User-agent / Disallow: / without any SEO penalty.How do I block OpenCode Agent in robots.txt?
/robots.txt file:User-agent: opencode Disallow: /
This instructs OpenCode Agent not to crawl any path on your site. To block only specific sections, replace / with the path (e.g.,
Disallow: /blog/).Does OpenCode Agent respect robots.txt?
opencode will stop a client that chooses to honour it; for enforcement, add a firewall or CDN rule as well.How do I verify if OpenCode Agent is crawling my site?
opencode (for example grep -i "opencode" /var/log/nginx/access.log). Because the operator publishes no IP ranges or reverse-DNS pattern, a match shows that something used the name, not that OpenCode sent it.