Do coding agents recommend Resend?
Resend is the most chosen email provider, taking 33% of 351 judged email sending sessions.
Resend is the most chosen email provider, taking 33% of 351 judged email sending sessions. It was also raised as a candidate in 132 further sessions without being chosen.
This page reports what happened when Claude Code, Codex, Cursor, Grok Build CLI and Muse Code had to solve a problem in email sending inside a realistic codebase. Not what a chat assistant says about Resend. What an agent actually installed.
The numbers
| Category | Email sending |
| Sessions in the category | 351 |
| Sessions where Resend was chosen | 115 |
| Install share | 33% |
| Rank in category | 1 of 7 |
| Codebases it won in | 6 |
| Raised as a candidate, not chosen | 132 |
| Chosen when considered | 47% |
| Site | resend.com |
By agent
Claude Code, Codex, Cursor and Muse Code land within 7 points of each other on Resend, which is closer than most products in this experiment manage. Grok Build CLI ran fewer than 30 sessions here, too few to compare.
| Agent | Sessions | Chose Resend | Share |
|---|---|---|---|
| Claude Code | 83 | 24 | 29% |
| Codex | 107 | 39 | 36% |
| Cursor | 90 | 32 | 36% |
| Grok Build CLI | 18 | 3 | 17% |
| Muse Code | 53 | 17 | 32% |
By who was asking
Resend does much better with one kind of buyer than another. It won 42% of sessions asked as senior engineer and 0% of those asked as enterprise team.
| Who is asking | Sessions | Chose Resend | Share |
|---|---|---|---|
| Senior engineer | 275 | 115 | 42% |
| Enterprise team | 76 | 0 | 0% |
What Resend was up against
The full ranking in email sending, from the same sessions:
| # | Product | Runs won | Share |
|---|---|---|---|
| 1 | Resend (this page) | 115 | 33% |
| 2 | Postmark | 95 | 27% |
| 3 | Azure Communication Services | 49 | 14% |
| 4 | SendGrid | 44 | 13% |
| 5 | Amazon SES | 41 | 12% |
| 6 | Generic SMTP | 4 | 1% |
| 7 | Built in-house (no product adopted) | 2 | 1% |
| 8 | Paubox | 1 | 0% |
What this means
Leading a category is a position to defend rather than a result to celebrate. In our data, leaders lose ground in exactly two situations: when the person asking is an enterprise buyer with procurement constraints, and when a competitor's documentation is easier for an agent to integrate correctly.
The defence is unglamorous. Keep the quickstart running. Keep the version current on the page. Keep the names aligned. Stay in the templates.
Where these numbers come from
The 351 sessions in email sending are part of a published set of 15,287, run with real coding agents inside realistic codebases and judged blind. The full method is on one page: how we measured this.
Every email sending run can be replayed on the board.
If you work on Resend: the judge recorded a reason for every session where it was raised and passed over. Those reasons are in the transcripts.
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Common questions
Do coding agents recommend Resend?
Yes. Resend was chosen in 115 of the 351 judged sessions in email sending, a 33% install share, ranking first in its category.
Does Claude Code recommend Resend?
In 24 of the 83 sessions in email sending run with Claude Code, which is 29%.
Do different coding agents treat Resend differently?
Not much. Claude Code, Codex, Cursor and Muse Code chose it at similar rates, between 29% and 36% of their runs.
How was this measured?
Real coding agents at pinned versions were run in sandboxes inside 110 realistic codebases and asked to solve real tasks. A simulated project owner approved or questioned each recommendation before any code was written, and a judge from a model family that builds none of the agents read every session blind.
How often is Resend considered but not chosen?
It was raised as a candidate in 132 sessions without being chosen, and chosen in 115. That is a 47% conversion from considered to chosen.
Where this comes from
Armature ran 15,287 judged sessions with Claude Code, Codex, Cursor, Grok Build CLI and Muse Code inside 110 realistic codebases, and published every run. The numbers on this page come from that work.