{"tool1":{"_id":"69b2d647de1ed13732dc08f8","name":"Resend","slug":"resend","url":"https://resend.com","description":"Email API for developers. Send transactional emails, manage contacts, domains, and campaigns.","logo":"","category":"Email","tags":["email","transactional-email","api","developer-tools"],"pricingModel":"freemium","scores":{"tokenEfficiency":{"score":6,"confidence":"scanner","evidence":"Email API typically returns structured, compact responses but lacks explicit field selection and batching capabilities, making it moderately efficient for agent use.","na":false},"access":{"score":7,"confidence":"scanner","evidence":"Offers REST API with Node.js and Python SDKs, an MCP server (resend-mcp), and framework integrations (Convex, Payload, NestJS), providing solid programmatic access without OpenAPI spec.","na":false},"auth":{"score":8,"confidence":"scanner","evidence":"Supports API key authentication for autonomous agent use with no OAuth requirement, enabling straightforward scoped access and test/production key separation typical of email service providers.","na":false},"speed":{"score":7,"confidence":"scanner","evidence":"Email APIs generally have reasonable latency and standard rate limits, though no explicit data on conditional requests (ETags) or concurrent batch support in the signals provided.","na":false},"discoverability":{"score":6,"confidence":"scanner","evidence":"Has llms.txt and developer docs indicating API-first design, but lacks OpenAPI spec which limits automatic integration and schema discovery for agents.","na":false},"reliability":{"score":7,"confidence":"scanner","evidence":"Email service providers typically implement idempotency and versioning for critical operations, and the mature npm package (v6.9.3) suggests stable schema consistency, though explicit status page data is absent.","na":false},"safety":{"score":6,"confidence":"scanner","evidence":"Supports test/production API keys and allows scoped access, but lacks explicit dry-run mode, undo capabilities, or sandbox environment for email operations typical of safer service designs.","na":false},"reactivity":{"score":4,"confidence":"scanner","evidence":"No evidence of webhooks, streaming, or SSE support in collected signals; email operations are inherently asynchronous but agents would rely on polling or external event tracking.","na":false}},"agentGrade":"B","agentScore":6.64,"scannerData":{"lastScannedAt":"2026-03-12T19:17:41.374Z","scanVersion":1,"rawSignals":{"homepage":{"status":200,"contentLength":441674,"hasStructuredData":true,"hasDeveloperDocs":true,"hasAgentMentions":true,"responseTimeMs":null},"openapi":{"found":false},"wellKnown":{"llmsTxt":{"found":true,"path":"/llms.txt","length":1213},"agentsJson":{"found":false},"robotsTxt":{"found":true,"blocksAgents":false,"hasSitemap":true}},"packages":{"npm":[{"name":"resend","description":"Node.js library for the Resend API","version":"6.9.3"},{"name":"@convex-dev/resend","description":"A resend component for Convex.","version":"0.2.3"},{"name":"@payloadcms/email-resend","description":"Payload Resend Email Adapter","version":"3.79.0"},{"name":"resend-mcp","description":"[![smithery badge](https://smithery.ai/badge/@resend/resend-mcp)](https://smithery.ai/server/@resend/resend-mcp) [![npm version](https://img.shields.io/npm/v/resend-mcp)](https://www.npmjs.com/package/resend-mcp)","version":"2.2.0"},{"name":"nestjs-resend","description":"NestJS provider for sending emails with resend","version":"1.1.0"}],"pypi":[{"name":"resend","version":"2.23.0","description":"Resend Python SDK"}],"cli":false,"sdks":["Node (resend)","Python (resend)"]},"mcp":{"found":false,"type":"none","servers":[]}},"biggestFriction":"Absence of an OpenAPI specification and webhook support forces agents to rely on SDK documentation and polling patterns, reducing autonomous integration flexibility compared to modern API platforms.","agentSummary":"Resend is well-positioned for agent use with solid API access, MCP server support, and autonomous API key authentication, making it straightforward for agents to send emails programmatically. However, the lack of OpenAPI documentation and reactive features (webhooks/streaming) limits agent discoverability and real-time responsiveness compared to fully agent-optimized platforms."},"accessMethods":{"restApi":true,"graphql":false,"cli":false,"sdk":["Node (resend)","Python (resend)"],"mcpServer":"none","openApiSpec":"","llmsTxt":true,"agentsJson":false},"authInfo":{"methods":["unknown"],"scopedPermissions":false,"humanRequired":true},"reviewCount":0,"avgReviewScore":0,"viewCount":41,"badgeEmbedCount":6,"agentSkillSlugs":[],"alternatives":[],"claimed":false,"status":"graded","createdAt":"2026-03-12T15:05:43.809Z","updatedAt":"2026-06-04T11:15:09.425Z","__v":0},"tool2":{"_id":"69b2da6867df398baec12ecd","name":"Mailgun","slug":"mailgun","url":"https://mailgun.com","description":"","logo":"","category":"Email","tags":[],"pricingModel":"unknown","scores":{"tokenEfficiency":{"score":6,"confidence":"scanner","evidence":"REST API with standard pagination support, but no indication of field selection, sparse fieldsets, or response compression capabilities for managing large email lists or batch operations.","na":false},"access":{"score":7,"confidence":"scanner","evidence":"Multiple SDKs available (Node.js, Python, JavaScript), REST API, and integrations with popular frameworks (NestJS, nodemailer), but no OpenAPI spec, MCP server, or CLI tool limits programmatic discovery and agent autonomy.","na":false},"auth":{"score":8,"confidence":"scanner","evidence":"API key-based authentication with no OAuth requirement enables autonomous agent operation, and Mailgun's domain-based scoping allows credential isolation between different email sending contexts.","na":false},"speed":{"score":7,"confidence":"scanner","evidence":"Email API typically has reasonable latency for transactional delivery, but no explicit data on rate limits, ETag support, or concurrent request handling; batch sending capabilities suggest good throughput but are not explicitly documented.","na":false},"discoverability":{"score":5,"confidence":"scanner","evidence":"Structured data and developer docs present on homepage, but absence of OpenAPI spec significantly limits automated discovery; API endpoints likely follow REST conventions but require manual documentation review.","na":false},"reliability":{"score":7,"confidence":"scanner","evidence":"Email APIs typically support idempotency keys for transactional safety and have stable versioned endpoints, but no explicit signals about versioning strategy, schema consistency, or status page monitoring.","na":false},"safety":{"score":6,"confidence":"scanner","evidence":"Mailgun offers sandbox domains for testing and API key scoping by domain, but no evidence of dry-run modes, granular permission scopes, or explicit undo mechanisms for sent emails.","na":false},"reactivity":{"score":5,"confidence":"scanner","evidence":"Email service inherently supports event webhooks for delivery tracking and bounces, but no evidence of streaming endpoints, Server-Sent Events, or real-time subscription mechanisms.","na":false}},"agentGrade":"B","agentScore":6.56,"accessMethods":{"restApi":true,"graphql":false,"cli":false,"sdk":["Node (@types/mailgun-js)","Python (mailgun)"],"mcpServer":"none","openApiSpec":"","llmsTxt":false,"agentsJson":false},"authInfo":{"methods":["unknown"],"scopedPermissions":false,"humanRequired":true},"reviewCount":0,"avgReviewScore":0,"viewCount":46,"badgeEmbedCount":6,"agentSkillSlugs":[],"alternatives":[],"claimed":false,"status":"graded","createdAt":"2026-03-12T15:23:20.715Z","updatedAt":"2026-06-04T11:15:05.388Z","__v":0,"scannerData":{"lastScannedAt":"2026-03-12T19:38:29.205Z","scanVersion":1,"rawSignals":{"homepage":{"status":200,"contentLength":334315,"hasStructuredData":true,"hasDeveloperDocs":true,"hasAgentMentions":false,"responseTimeMs":null},"openapi":{"found":false},"wellKnown":{"llmsTxt":{"found":false},"agentsJson":{"found":false},"robotsTxt":{"found":true,"blocksAgents":false,"hasSitemap":true}},"packages":{"npm":[{"name":"@types/mailgun-js","description":"TypeScript definitions for mailgun-js","version":"0.22.19"},{"name":"@types/nodemailer-mailgun-transport","description":"TypeScript definitions for nodemailer-mailgun-transport","version":"1.4.6"},{"name":"mailgun","description":"Mailgun for Node.js","version":"0.5.0"},{"name":"mailgun.js","description":"A javascript sdk for Mailgun built with webpack, babel & es6. This can be used in node or in the browser*.","version":"12.7.1"},{"name":"nestjs-mailgun","description":"NestJS provider for sending emails with mailgun","version":"4.0.3"},{"name":"firebase-tools","description":"Command-Line Interface for Firebase","version":"15.9.1"},{"name":"@playwright/mcp","description":"Playwright Tools for MCP","version":"0.0.68"},{"name":"nodemailer-mailgun-transport","description":"A transport module to use with nodemailer to leverage Mailgun's REST API","version":"2.1.5"}],"pypi":[{"name":"mailgun","version":"1.6.0","description":"Python SDK for Mailgun"}],"cli":false,"sdks":["Node (@types/mailgun-js)","Python (mailgun)"]},"mcp":{"found":false,"type":"none","servers":[]}},"biggestFriction":"Absence of an OpenAPI specification and MCP server forces agents to rely on hardcoded knowledge of API endpoints and manual SDK integration rather than autonomous discovery and tool use.","agentSummary":"Mailgun is a well-established email API with solid REST and SDK support, making it accessible to agents with proper authentication and credential management. However, the lack of OpenAPI specs and MCP servers limits autonomous discoverability, and missing dry-run capabilities create safety friction for batch email operations."}}}