agentsandboxes.fyi
AgentSandboxes
A neutral index of cloud sandboxes for AI agents, with source-linked specs, a free REST API and an MCP endpoint.
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agentsandboxes.fyi
A neutral index of cloud sandboxes for AI agents, with source-linked specs, a free REST API and an MCP endpoint.
Submitted URLs are declarations until checked. Verification inspects published content and does not execute third-party tools.
The score measures observable documentation quality. Each component below lists its earned points, exact checks, and source observations. It is not a prediction of AI rankings or citations.
Overall readiness
Confidence: high· V2
How this score is calculated
round(99.71 ÷ 100 × 100) = 100/100
99.71 points earned out of 100 assessed. All 100 available points were assessed. The checks below show each result. Optional integrations and file size earn no extra points.
Full scoring rules and worked exampleCurrent usable primary file: 25/25.
Current llms.txt retrieval succeeded (HTTP 200); usable text verified.
llms.txt: Documentation sections: AgentSandboxes; Regions; Sandbox providers by city; Categories; Free tools; Products. Derived from headings; source checked 2026-11-10.
llms-full.txt: Documentation sections: AgentSandboxes; Online, Global, United States; AWS AgentCore; Blaxel; Browserbase; Cloudflare Sandbox. Derived from headings; source checked 2026-11-10.
Listing updated: . Machine-readable profile (JSON)
{
"schemaVersion": "1.0",
"name": "AgentSandboxes",
"slug": "agentsandboxes",
"website": "https://agentsandboxes.fyi",
"category": "developer-tools",
"description": "A neutral index of cloud sandboxes for AI agents, with source-linked specs, a free REST API and an MCP endpoint.",
"capabilities": [
"llmsTxt documentation",
"llmsFullTxt documentation"
],
"aiResources": {
"llmsTxt": {
"type": "llmsTxt",
"url": "https://agentsandboxes.fyi/llms.txt",
"status": "verified",
"available": true,
"httpStatus": 200,
"checkedAt": "2026-11-10T22:22:15.420Z",
"lastSuccessfulAt": "2026-11-10T22:22:15.420Z",
"contentType": "text/plain; charset=utf-8",
"contentSize": 6016,
"estimatedTokens": 1504,
"tokenMethod": "UTF-16 characters / 4 (approximation)",
"contentHash": "4f21772f7f877e379a34d73ad63b9d673faaf30f5bbb61bb3acd83a0d4221690",
"internalLinks": 35,
"externalLinks": 0,
"document": {
"h1Count": 1,
"firstBlockIsH1": true,
"title": "AgentSandboxes",
"usefulTitle": true,
"headingCount": 12,
"uniqueHeadingCount": 12,
"hasSections": true,
"orderedHeadings": true,
"sectionWithContent": true,
"fileListLinks": 32,
"summaryPresent": true,
"contextPresent": true,
"validLinks": 35,
"invalidLinks": 0,
"duplicateLinks": 0,
"descriptiveLinks": 35,
"annotatedLinks": 31
},
"linkHealth": {
"eligibleCount": 35,
"selectedCount": 5,
"sampledCount": 5,
"working": 5,
"broken": 0,
"unknown": 0,
"checkedAt": "2026-11-10T22:22:17.135Z",
"sourceHash": "4f21772f7f877e379a34d73ad63b9d673faaf30f5bbb61bb3acd83a0d4221690",
"method": "deterministic sample, at most 5 URLs, at most 2 concurrent hosts, 15s budget",
"results": [
{
"url": "https://agentsandboxes.fyi/guides/common-mistakes-and-questions.md",
"httpStatus": 200,
"checkedAt": "2026-11-10T22:22:17.135Z",
"attempted": true,
"status": "working",
"reason": "http_success"
},
{
"url": "https://agentsandboxes.fyi/.well-known/mcp/server-card.json",
"httpStatus": 200,
"checkedAt": "2026-11-10T22:22:17.135Z",
"attempted": true,
"status": "working",
"reason": "http_success"
},
{
"url": "https://agentsandboxes.fyi/webmcp",
"httpStatus": 200,
"checkedAt": "2026-11-10T22:22:17.135Z",
"attempted": true,
"status": "working",
"reason": "http_success"
},
{
"url": "https://agentsandboxes.fyi/contact.md",
"httpStatus": 200,
"checkedAt": "2026-11-10T22:22:17.135Z",
"attempted": true,
"status": "working",
"reason": "http_success"
},
{
"url": "https://agentsandboxes.fyi/category/browser.md",
"httpStatus": 200,
"checkedAt": "2026-11-10T22:22:17.135Z",
"attempted": true,
"status": "working",
"reason": "http_success"
}
]
},
"headings": [
"AgentSandboxes",
"Regions",
"Sandbox providers by city",
"Categories",
"Free tools",
"Products",
"Academy",
"Guides",
"About this site",
"Data sources",
"API",
"Optional"
],
"warnings": [],
"summary": "Documentation sections: AgentSandboxes; Regions; Sandbox providers by city; Categories; Free tools; Products.",
"summarySourceHash": "4f21772f7f877e379a34d73ad63b9d673faaf30f5bbb61bb3acd83a0d4221690",
"processingVersion": "2.0",
"method": "markdown-ast-analysis"
},
"llmsFullTxt": {
"type": "llmsFullTxt",
"url": "https://agentsandboxes.fyi/llms-full.txt",
"status": "verified",
"available": true,
"httpStatus": 200,
"checkedAt": "2026-11-10T22:22:15.930Z",
"lastSuccessfulAt": "2026-11-10T22:22:15.930Z",
"contentType": "text/plain; charset=utf-8",
"contentSize": 12102,
"estimatedTokens": 3026,
"tokenMethod": "UTF-16 characters / 4 (approximation)",
"contentHash": "d5f249f708db6840e54c942b4d9550ba17fd693e38e39c1ffbe047cec9f24e6a",
"internalLinks": 34,
"externalLinks": 25,
"document": {
"h1Count": 1,
"firstBlockIsH1": true,
"title": "AgentSandboxes",
"usefulTitle": true,
"headingCount": 31,
"uniqueHeadingCount": 31,
"hasSections": true,
"orderedHeadings": true,
"sectionWithContent": true,
"fileListLinks": 34,
"summaryPresent": true,
"contextPresent": true,
"validLinks": 59,
"invalidLinks": 0,
"duplicateLinks": 0,
"descriptiveLinks": 34,
"annotatedLinks": 9
},
"headings": [
"AgentSandboxes",
"Online, Global, United States",
"AWS AgentCore",
"Blaxel",
"Browserbase",
"Cloudflare Sandbox",
"CodeSandbox SDK",
"Cua",
"Daytona",
"E2B",
"Fly Sprites",
"ForeverVM"
],
"warnings": [],
"summary": "Documentation sections: AgentSandboxes; Online, Global, United States; AWS AgentCore; Blaxel; Browserbase; Cloudflare Sandbox.",
"summarySourceHash": "d5f249f708db6840e54c942b4d9550ba17fd693e38e39c1ffbe047cec9f24e6a",
"processingVersion": "2.0",
"method": "markdown-ast-analysis"
},
"webmcp": null
},
"readiness": {
"score": 100,
"version": "2.0",
"confidence": "high",
"components": [
{
"name": "availability",
"weight": 25,
"assessedWeight": 25,
"points": 25,
"rules": [
{
"id": "current_access",
"label": "Current usable primary file",
"weight": 25,
"observation": "Current llms.txt retrieval succeeded (HTTP 200); usable text verified.",
"points": 25
}
],
"explanation": "Current usable primary file: 25/25."
},
{
"name": "structure",
"weight": 25,
"assessedWeight": 25,
"points": 25,
"rules": [
{
"id": "title",
"label": "One project H1 at the beginning",
"weight": 10,
"observation": "1 H1 heading(s); starts with H1: yes.",
"points": 10
},
{
"id": "sections",
"label": "Coherent content sections",
"weight": 5,
"observation": "H2 with content: yes; no heading-level jumps: yes.",
"points": 5
},
{
"id": "file_lists",
"label": "Documentation links organized in lists",
"weight": 5,
"observation": "32 valid link occurrence(s) inside Markdown lists.",
"points": 5
},
{
"id": "heading_uniqueness",
"label": "Non-repeated headings",
"weight": 5,
"observation": "12 unique heading(s) out of 12; code examples are excluded.",
"points": 5
}
],
"explanation": "One project H1 at the beginning: 10/10. Coherent content sections: 5/5. Documentation links organized in lists: 5/5. Non-repeated headings: 5/5."
},
{
"name": "links",
"weight": 25,
"assessedWeight": 25,
"points": 24.71,
"rules": [
{
"id": "link_syntax",
"label": "Resolvable HTTP(S) link syntax",
"weight": 5,
"observation": "35 valid URL occurrence(s), 0 malformed, unsupported or unresolved.",
"points": 5
},
{
"id": "link_uniqueness",
"label": "Unique documentation destinations",
"weight": 5,
"observation": "35 unique destination(s) from 35 valid occurrence(s).",
"points": 5
},
{
"id": "link_labels",
"label": "Descriptive link labels",
"weight": 2.5,
"observation": "35 of 35 unique links have non-placeholder labels. This is a text heuristic, not a semantic guarantee.",
"points": 2.5
},
{
"id": "link_notes",
"label": "Context beside file links",
"weight": 2.5,
"observation": "31 of 35 unique links have notes beside a Markdown list link.",
"points": 2.21
},
{
"id": "link_health",
"label": "Sampled destination accessibility",
"weight": 10,
"observation": "5 of 35 destinations sampled: 5 working, 0 confirmed 404/410, 0 unknown. Only working and confirmed-broken results enter this fraction.",
"points": 10
}
],
"explanation": "Resolvable HTTP(S) link syntax: 5/5. Unique documentation destinations: 5/5. Descriptive link labels: 2.5/2.5. Context beside file links: 2.21/2.5. Sampled destination accessibility: 10/10."
},
{
"name": "confidence",
"weight": 15,
"assessedWeight": 15,
"points": 15,
"rules": [
{
"id": "verification_age",
"label": "Age of last successful verification",
"weight": 10,
"observation": "Last success: 2026-11-10T22:22:15.420Z. Full points through day 8 (7-day schedule plus 1-day grace), 60% through day 30, 20% thereafter or for an unknown date.",
"points": 10
},
{
"id": "latest_success",
"label": "Latest primary check succeeded",
"weight": 5,
"observation": "Latest primary verification succeeded.",
"points": 5
}
],
"explanation": "Age of last successful verification: 10/10. Latest primary check succeeded: 5/5."
},
{
"name": "metadata",
"weight": 10,
"assessedWeight": 10,
"points": 10,
"rules": [
{
"id": "summary",
"label": "Useful summary blockquote",
"weight": 5,
"observation": "A blockquote before the first H2 with at least 20 non-whitespace characters and no placeholder-only text.",
"points": 5
},
{
"id": "context",
"label": "Useful introductory context",
"weight": 5,
"observation": "An introductory paragraph before the first H2 with at least 20 non-whitespace characters and no placeholder-only text. Listing form fields do not earn these points.",
"points": 5
}
],
"explanation": "Useful summary blockquote: 5/5. Useful introductory context: 5/5."
}
],
"earnedPoints": 99.71,
"assessedWeight": 100,
"availableWeight": 100,
"provisional": false,
"calculatedAt": "2026-11-10T22:22:19.935Z",
"lastVerifiedAt": "2026-11-10T22:22:15.420Z",
"evidence": {
"sourceUrl": "https://agentsandboxes.fyi/llms.txt",
"contentHash": "4f21772f7f877e379a34d73ad63b9d673faaf30f5bbb61bb3acd83a0d4221690",
"processingVersion": "2.0",
"retrievedAt": "2026-11-10T22:22:15.420Z"
},
"linkSampling": {
"eligibleCount": 35,
"selectedCount": 5,
"sampledCount": 5,
"working": 5,
"broken": 0,
"unknown": 0,
"checkedAt": "2026-11-10T22:22:17.135Z",
"sourceHash": "4f21772f7f877e379a34d73ad63b9d673faaf30f5bbb61bb3acd83a0d4221690",
"method": "deterministic sample, at most 5 URLs, at most 2 concurrent hosts, 15s budget",
"results": [
{
"url": "https://agentsandboxes.fyi/guides/common-mistakes-and-questions.md",
"httpStatus": 200,
"checkedAt": "2026-11-10T22:22:17.135Z",
"attempted": true,
"status": "working",
"reason": "http_success"
},
{
"url": "https://agentsandboxes.fyi/.well-known/mcp/server-card.json",
"httpStatus": 200,
"checkedAt": "2026-11-10T22:22:17.135Z",
"attempted": true,
"status": "working",
"reason": "http_success"
},
{
"url": "https://agentsandboxes.fyi/webmcp",
"httpStatus": 200,
"checkedAt": "2026-11-10T22:22:17.135Z",
"attempted": true,
"status": "working",
"reason": "http_success"
},
{
"url": "https://agentsandboxes.fyi/contact.md",
"httpStatus": 200,
"checkedAt": "2026-11-10T22:22:17.135Z",
"attempted": true,
"status": "working",
"reason": "http_success"
},
{
"url": "https://agentsandboxes.fyi/category/browser.md",
"httpStatus": 200,
"checkedAt": "2026-11-10T22:22:17.135Z",
"attempted": true,
"status": "working",
"reason": "http_success"
}
]
},
"warnings": [
"This measures observable documentation, not model rankings or citation probability.",
"H1 is the only required section in the llms.txt proposal. Other checks are LLMSList quality preferences; missing optional sections do not make usable text invalid.",
"Destination accessibility covers a sample of 5 out of 35 unique links, not the entire website."
]
},
"updatedAt": "2026-11-10T22:22:19.935Z"
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35 unique destination(s) from 35 valid occurrence(s).
35 of 35 unique links have non-placeholder labels. This is a text heuristic, not a semantic guarantee.
31 of 35 unique links have notes beside a Markdown list link.
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Latest primary verification succeeded.
Useful summary blockquote: 5/5. Useful introductory context: 5/5.
A blockquote before the first H2 with at least 20 non-whitespace characters and no placeholder-only text.
An introductory paragraph before the first H2 with at least 20 non-whitespace characters and no placeholder-only text. Listing form fields do not earn these points.
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Destination responded successfully
Destination responded successfully
Destination responded successfully
Last verified: 2026-11-10.
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H1 is the only required section in the llms.txt proposal. Other checks are LLMSList quality preferences; missing optional sections do not make usable text invalid.
Destination accessibility covers a sample of 5 out of 35 unique links, not the entire website.
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