Spline

Fair

Agent Native Score

Free Tier

Spline is a web-based 3D design and collaboration tool that allows users to create, animate, and publish interactive 3D experiences without coding. It provides real-time collaboration features and integrates with web platforms.

Categories: Design · 3d Modeling · Collaboration

#22 of 24 in Design · #65 of 71 in Collaboration

Checklist Breakdown

11 of 33 checks passed. 14 unscored.

Discovery 50%

Can an agent find and understand this tool without a web search?

✗ Published OpenAPI/Swagger spec

✗ Has llms.txt or llms-full.txt

✗ Has an MCP server (official or well-maintained)

✗ MCP server listed in a public registry

✓ API reference docs are publicly accessible

✓ Docs include runnable code examples

✓ Has a public changelog or release notes

✓ Has a public status page

Auth & Onboarding 33%

Can an agent create an account and get credentials without human intervention?

✗ Signup does not require CAPTCHA

✗ Signup does not require phone verification

✗ Supports API key auth (not only OAuth)

✗ API key obtainable without manual approval

✓ No mandatory billing info to start

✓ Can sign up without creating an organization

Pricing 100%

Can an agent operate autonomously without upfront payment or contracts?

✓ Has a free tier

✓ Usage-based pricing available

✓ No minimum contract or commitment

✓ Pricing page is public (no 'contact sales')

✓ Free tier sufficient for testing (not just a trial)

Agent Tooling Not yet scored

How well does the API work for non-human consumers?

— SDK available in 2+ languages

— Structured error responses (JSON with error codes)

— Idempotency support on write endpoints

— Pagination on list endpoints

— Webhook/event support

— Sandbox or test mode available

— Rate limit headers in responses

— Consistent REST resource naming

Reliability Not yet scored

Does the tool fail gracefully when an agent makes a mistake?

— Meaningful error messages (not just 500)

— 429 responses include Retry-After header

— Documented uptime SLA (99.9%+)

— Graceful degradation under rate limits

— Request IDs in responses for debugging

— API versioning supported

Reviewer Notes

Spline is primarily a design UI tool with limited agent integration capabilities. It lacks an official API, OpenAPI spec, or MCP server—agents cannot programmatically create projects, modify designs, or retrieve structured design data. Account creation requires OAuth or email verification with CAPTCHA, blocking autonomous signup. The free tier is available but provides no sandbox environment for testing. While Spline has good uptime and offers free access, it fundamentally isn't architected for agent-driven workflows; it's best suited for human designers using the visual interface.

Spline

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