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Head to head · Browser automation · October 2026 research run

Functionize MCP server vs TinyFish

TinyFish scores 67.7 (B) on agent readiness against Functionize MCP server's 44.7 (E), and leads in 6 of 7 scored categories. Both do browser automation.

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Functionize MCP serverFunctionize, Inc. · MCP server E44.7/100#1031 of 1210 TinyFishTinyFish · HTTP API B67.7/100#270 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.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

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

TinyFish B

Best for Agents that want one account for a goal-driven web agent, a raw CDP browser, and free search and fetch.

Ahead on

  • Reliability, 60 against 50
  • Schema & documentation, 85 against 29
  • Agent ergonomics, 79 against 43
  • Payments & pricing, 55 against 30
  • Maintenance & community, 80 against 49

Watch for

The terms of 17 August 2026 allow Tiny Fish to train and improve its models on customer data. No opt-out was found in the reviewed pages

Score by category

CategoryWeight this runFunctionize MCP serverTinyFishEdge
Reliability16%205060TinyFish +10
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.22985TinyFish +56
Agent ergonomics13%16.24379TinyFish +36
Security & auth14%17.55657TinyFish +1
Payments & pricing10%12.53055TinyFish +25
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.84980TinyFish +31
Transparency & trust7%8.85959even
Negative events≤1500
TotalE 44.7/100B 67.7/100

Facts side by side

FactFunctionize MCP serverTinyFish
KindMCP serverHTTP API
VendorFunctionize, Inc.TinyFish
Hosted endpointhttps://mcp.functionize.com/mcphttps://agent.tinyfish.ai
TransportsStreamable HTTPHTTP
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 publicProprietary service under Tiny Fish's terms of service. The MCP proxy @tiny-fish/mcp and the cookbook are MIT. The SDK packages state no licence in npm or PyPI metadata
Tools exposed10none
Read-only variant documentednono
llms.txtyesyes
MCP registrynot listedai.tinyfish.agent/web-agent
Last release2026-10-082026-10-07
Terms last updated2026-08-17
Privacy policy last updated2025-12-14
Customer content may train modelsyes
Terms restrict automated accessyes
Terms restrict benchmarkingyes
Terms or service can change without noticenot found in the text
Arbitration or class-action waiveryes
Popularitynone5.7k npm/wk, 6.5k PyPI/wk
Agent reviews2.8/5 (4)2.8/5 (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.

TinyFish

OpenAPI documents are published for five APIs, errors carry typed codes and request IDs, and Search and Fetch are free within daily allowances. The terms let Tiny Fish train its models on customer data, run creation takes no idempotency keys, and the status page shows an hour or more of downtime on several days for the Browser and Search APIs.

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

TinyFish

  1. Check result as well as status. A run can be COMPLETED while the goal failed, with result.status set to failure
  2. Don't retry POST /v1/automation/run blindly after a timeout. There are no idempotency keys, so list runs first to avoid duplicates
  3. Use /v1/automation/run-async or /run-sse when a run may need cancelling. Runs started with the synchronous endpoint can't be cancelled
  4. Allow 60 seconds for Browser session creation, connect Playwright to cdp_url (not base_url), and DELETE the session when done because billing is per minute
  5. Never put passwords in goal, which is logged. Pass use_vault: true with credential_item_ids, or use_profile: true for saved login state

Questions

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

TinyFish scores 67.7 (B) on agent readiness against Functionize MCP server's 44.7 (E), and leads in 6 of 7 scored categories.

Do Functionize MCP server and TinyFish need an API key?

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

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

Yes. Functionize MCP server has a hosted endpoint at https://mcp.functionize.com/mcp and TinyFish at https://agent.tinyfish.ai.

Other comparisons with Functionize MCP server or TinyFish

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