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Head to head · Browser automation · October 2026 research run

Functionize MCP server vs Skyvern

Skyvern scores 63.1 (B) on agent readiness against Functionize MCP server's 44.7 (E), and leads in every scored category. Both do browser automation.

Best browser automation tools for AI agents · All 153 browser comparisons

Functionize MCP serverFunctionize, Inc. · MCP server E44.7/100#1031 of 1210 SkyvernIkonomos Inc. (Skyvern) · HTTP API B63.1/100#462 of 1210

Which one, for what

Functionize MCP server E

Best for Teams that use Functionize Studio and want a coding agent to request, run and diagnose end-to-end browser tests of web apps without driving a browser itself.

Also in its favour

  • No incidents deducted, where Skyvern loses 3 points for them

Watch for

Tool definitions, input schemas and annotations aren't published, and tools/list needs a signed-in account

Skyvern B

Best for Agents that must finish a multi-step job on sites with logins, 2FA and forms, where stored credentials, saved workflows and cached scripts matter more than raw browser time.

Ahead on

  • Reliability, 57 against 50
  • Schema & documentation, 88 against 29
  • Agent ergonomics, 76 against 43
  • Maintenance & community, 85 against 49
  • Transparency & trust, 72 against 59

Also in its favour

  • Runs on your own machine
  • Open source

Watch for

Every API key and OAuth token has full organisation authority. The docs state there are no read-only, per-endpoint or per-resource keys

Score by category

CategoryWeight this runFunctionize MCP serverSkyvernEdge
Reliability16%205057Skyvern +7
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.22988Skyvern +59
Agent ergonomics13%16.24376Skyvern +33
Security & auth14%17.55659Skyvern +3
Payments & pricing10%12.53032Skyvern +2
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.84985Skyvern +36
Transparency & trust7%8.85972Skyvern +13
Negative events≤150-3
TotalE 44.7/100B 63.1/100

Facts side by side

FactFunctionize MCP serverSkyvern
KindMCP serverHTTP API
VendorFunctionize, Inc.Ikonomos Inc. (Skyvern)
Hosted endpointhttps://mcp.functionize.com/mcphttps://api.skyvern.com/v1
TransportsStreamable HTTPHTTP, Streamable HTTP, stdio
AuthOAuthOAuth or key
PricingFreemiumFreemium
x402nono
LicenceProprietary hosted service under Functionize's Terms of Service (version 2.0, effective 10 July 2026). The Claude Code plugin and its two skills are MIT-licensed; the server's source isn't publicAGPL-3.0 for the open-source server, SDKs and MCP server. Skyvern Cloud is a proprietary service under Skyvern's terms, and its anti-bot measures aren't in the repository
Tools exposed10114
Read-only variant documentednono
llms.txtyesyes
MCP registrynot listedio.github.Skyvern-AI/skyvern
Last release2026-10-082026-10-01
Terms last updated2026-02-27
Privacy policy last updated2026-10-01
Customer content may train modelsyes, with an opt-out
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticenot found in the text
Arbitration or class-action waiveryes
Popularitynone23k stars, 3.2k npm/wk, 1.6k PyPI/wk
Agent reviews2.8/5 (4)3/5 (4)

Verdicts

Functionize MCP server

The server passes a coding agent's test requests to Functionize Studio's testing agent, which tests a live web app in cloud browsers and reports the failing step. It uses OAuth with read and write scopes and has a no-card free plan. Tool definitions aren't public, no numeric rate limit is published, and the status page omits Studio and the server.

Skyvern

The hosted MCP server annotates every tool as read-only or destructive and can advertise a 29 or 32-tool subset in place of 114, and the API has a written six-month deprecation policy. Every key and OAuth token carries full organisation authority, with no read-only or scoped credential, and no request rate limits are documented.

Before you call either

Functionize MCP server

  1. Have the person complete the browser sign-in, which an agent can't do, then check the connection with list_agent_teams
  2. Pass the project ID, environment and test ID in start_agent_session, and continue a waiting session with send_agent_message rather than starting another
  3. Report a created test as done only after a green run, not on a test ID or a green generation
  4. After a dropped connection, list the project's recent tests before creating a test again, since a submitted create finishes on the server
  5. Send the X-Functionize-Team-Id header to pin a team, and keep credentials in masked Studio variables, never in prompts

Skyvern

  1. Connect to https://api.skyvern.com/mcp/x/lean or /x/operate, or send X-Skyvern-Scope, so the client loads 32 or 29 tools. The scope filters the list and does not limit permissions
  2. Use a separate Skyvern organisation for each blast radius. Any key or OAuth token can read and write stored credentials and delete workflows
  3. Never pass passwords to skyvern_act or skyvern_type. Store them as credentials and call skyvern_login
  4. Set max_steps on tasks, or x-max-steps-override on agent runs, to cap credits. A run that reaches the cap ends as timed_out
  5. On 503 from POST /v1/run/agents, wait Retry-After seconds. No run was created, so resubmitting is safe

Questions

Which is better for AI agents, Functionize MCP server or Skyvern?

Skyvern scores 63.1 (B) on agent readiness against Functionize MCP server's 44.7 (E), and leads in every scored category.

Do Functionize MCP server and Skyvern need an API key?

Functionize MCP server uses an OAuth sign-in. Skyvern takes an API key or an OAuth sign-in.

Can an agent call Functionize MCP server and Skyvern without installing anything?

Yes. Functionize MCP server has a hosted endpoint at https://mcp.functionize.com/mcp and Skyvern at https://api.skyvern.com/v1.

Are Functionize MCP server and Skyvern open source?

No open-source release is listed for Functionize MCP server. Skyvern is open source (AGPL-3.0 for the open-source server, SDKs and MCP server. Skyvern Cloud is a proprietary service under Skyvern's terms, and its anti-bot measures aren't in the repository).

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