{"tool":{"slug":"resend","name":"Resend","url":"https://www.canagentsuse.com/tools/resend","websiteUrl":"https://resend.com","docsUrl":"https://resend.com/docs","githubUrl":"https://github.com/resend","tagline":"Transactional email for developers.","shortDescription":"A developer-friendly email API with clear docs, SDKs, domains, audiences, and broadcasts.","agentSummary":"Good for agents that need to wire transactional email and inspect delivery paths quickly.","bestFor":"Transactional email, onboarding emails, and product notifications.","cautionNotes":"Key limitations: Domain verification and deliverability settings are human-sensitive. Outbound messages, SMS, email deliverability, consent, unsubscribe behavior, private chats, and customer-facing replies need approval, throttling, and audit logs. API automation needs client-side throttling, idempotency where supported, pagination limits, retries, and audit logging. Browser automation can be brittle around UI changes, MFA, captchas, policy prompts, and hidden confirmation states. Account setup or elevated access may require vendor, admin, or compliance approval before an agent can operate independently.","pricingSummary":"Public pricing with free and paid email volume tiers.","authModel":"API keys and domain verification.","accountCreation":"Self-serve signup.","browserSupport":"Dashboard helps with API keys, domains, logs, and broadcasts.","cliPackage":null,"apiBaseUrl":"https://api.resend.com","mcpServer":null,"agentScore":60,"agentTier":"Usable","scoreBreakdown":{"score":60,"tier":"Usable","summary":"Usable: 60/100. Strongest in agent readability; weakest in agent safety.","groups":[{"key":"operability","label":"Machine operability","weight":25,"score":14,"maxScore":25,"signals":[{"slug":"api","label":"API","weight":10,"score":10,"maxScore":10,"supportLevel":"native","evidence":"Email send, audiences, contacts, domains, and API keys are documented."},{"slug":"mcp","label":"MCP","weight":4,"score":0,"maxScore":4,"supportLevel":"unknown","evidence":"No MCP server evidence listed."},{"slug":"cli","label":"CLI","weight":6,"score":0,"maxScore":6,"supportLevel":"unknown","evidence":"No CLI evidence listed."},{"slug":"browser","label":"Browser fallback","weight":5,"score":4,"maxScore":5,"supportLevel":"strong","evidence":"Dashboard is useful for logs and domain setup."}]},{"key":"safety","label":"Agent safety","weight":25,"score":4.4,"maxScore":25,"signals":[{"slug":"sandbox","label":"Sandbox or test mode","weight":10,"score":0,"maxScore":10,"supportLevel":"unknown","evidence":"No clear evidence found."},{"slug":"scoped-auth","label":"Scoped auth","weight":6,"score":0,"maxScore":6,"supportLevel":"unknown","evidence":"No clear evidence found."},{"slug":"dry-run-preview","label":"Dry-run or preview","weight":4,"score":0,"maxScore":4,"supportLevel":"unknown","evidence":"No clear evidence found."},{"slug":"human-review","label":"Human review guidance","weight":3,"score":2.4,"maxScore":3,"supportLevel":"strong","evidence":"Caution notes identify workflows that need human review."},{"slug":"idempotency","label":"Idempotency or retry safety","weight":2,"score":2,"maxScore":2,"supportLevel":"native","evidence":"Docs or summaries mention retry/idempotency safety."}]},{"key":"readability","label":"Agent readability","weight":20,"score":19,"maxScore":20,"signals":[{"slug":"docs-quality","label":"Docs quality","weight":8,"score":8,"maxScore":8,"supportLevel":"native","evidence":"Official docs are listed for API behavior, authentication, limits, examples, and setup review."},{"slug":"pricing-clarity","label":"Pricing clarity","weight":5,"score":4,"maxScore":5,"supportLevel":"strong","evidence":"Volume pricing is easy to inspect."},{"slug":"evidence-depth","label":"Evidence links","weight":4,"score":4,"maxScore":4,"supportLevel":"native","evidence":"5 signal evidence links listed."},{"slug":"docs-url","label":"Dedicated docs URL","weight":3,"score":3,"maxScore":3,"supportLevel":"native","evidence":"Dedicated documentation URL is listed."}]},{"key":"setup","label":"Auth and setup","weight":15,"score":12,"maxScore":15,"signals":[{"slug":"account-creation","label":"Account setup","weight":7,"score":5.6,"maxScore":7,"supportLevel":"strong","evidence":"Self-serve signup."},{"slug":"auth-clarity","label":"Auth model clarity","weight":5,"score":4,"maxScore":5,"supportLevel":"strong","evidence":"API keys and domain verification."},{"slug":"self-serve","label":"Self-serve onboarding","weight":3,"score":2.4,"maxScore":3,"supportLevel":"strong","evidence":"Onboarding appears self-serve or testable."}]},{"key":"reliability","label":"Production reliability","weight":15,"score":10.4,"maxScore":15,"signals":[{"slug":"webhook-events","label":"Webhooks or events","weight":5,"score":4,"maxScore":5,"supportLevel":"strong","evidence":"Tool documents webhooks, events, or notification flows."},{"slug":"logs-audit","label":"Logs or audit trail","weight":4,"score":4,"maxScore":4,"supportLevel":"native","evidence":"Tool exposes logs, traces, or audit-friendly records."},{"slug":"versioned-api","label":"Versioned API","weight":3,"score":0,"maxScore":3,"supportLevel":"unknown","evidence":"No clear evidence found."},{"slug":"rate-limit-clarity","label":"Rate limit clarity","weight":3,"score":2.4,"maxScore":3,"supportLevel":"strong","evidence":"Tool documents usage limits, quotas, or credits."}]}]},"launchScore":330,"isFeatured":false,"categories":[{"slug":"email-messaging","name":"Email & messaging","description":"Transactional email, SMS, chat, and collaboration surfaces.","sortOrder":70}],"useCases":[{"slug":"publish-content","name":"Publish content","description":"Create or schedule posts, docs, email, and customer messages."},{"slug":"ship-app","name":"Ship an app","description":"Provision infra, deploy, monitor, and iterate on production apps."}],"capabilities":[{"slug":"api","name":"API","group":"Agent access","supportLevel":"native","detail":"Email send, audiences, contacts, domains, and API keys are documented.","evidenceUrl":"https://resend.com/docs"},{"slug":"browser","name":"Browser","group":"Agent access","supportLevel":"strong","detail":"Dashboard is useful for logs and domain setup.","evidenceUrl":"https://resend.com/docs"},{"slug":"account-creation","name":"Account creation","group":"Onboarding","supportLevel":"strong","detail":"Self-serve signup.","evidenceUrl":"https://resend.com"},{"slug":"pricing-clarity","name":"Pricing clarity","group":"Buying","supportLevel":"strong","detail":"Volume pricing is easy to inspect.","evidenceUrl":"https://resend.com/docs"},{"slug":"docs-quality","name":"Docs quality","group":"Understanding","supportLevel":"native","detail":"Official docs are listed for API behavior, authentication, limits, examples, and setup review.","evidenceUrl":"https://resend.com/docs"}]}}