The MCP Servers Worth Paying For (and the Ones That Just Eat Context)
A task-based cut of the MCP ecosystem from someone who already wires ads, analytics, and repo tools into Claude. Buy, skip, wait, with security and context cost as first-class metrics.
I have a rule for MCP now. If a server cannot name the job it finishes, it is entertainment.
The ecosystem exploded. Every SaaS with a REST API grew a README that says "works with Claude and Cursor." Half of them dump entire schemas into the context window on connect. A quarter want write scopes you should never grant a chat box on a Friday. The useful quarter is why this protocol won.
This is not a directory of forty logos. It is a verdict list from wiring MCP into real client work, including the Google Ads and GA4 audit path I already wrote up.
How I score a server
| Criterion | Pass looks like |
|---|---|
| Job clarity | One sentence: "this finishes X" |
| Context cost | Tools are discoverable without pasting the universe |
| Auth blast radius | Read-only possible; write is gated and obvious |
| Failure mode | Errors are legible; no silent empty success |
| Host portability | Works in Claude Code / Cursor / desktop without a rewrite |
If it fails context cost, I skip even when the demo is pretty. Context is rent. Servers that burn rent on connect are a tax on every later thought.
Buy
GitHub (official or well-maintained community, read-heavy). Job: PRs, issues, file reads against the remote when local is not enough. Buy for code review and "what shipped last week" questions. Keep write scopes off until you have a reason.
Filesystem / project roots you already trust.
Job: the agent can see the repo you meant. Buy, because without this MCP is cosplay. Constrain roots. Do not point it at $HOME.
Browser automation (Playwright/Puppeteer-class) for repro only. Job: "show me the broken state" and light QA. Buy for bug reproduction. Skip as a general surfing buddy. Flaky, slow, easy to over-permission.
Postgres or warehouse read replicas with a forced LIMIT culture. Job: answer data questions without exporting CSVs by hand. Buy only with read-only roles and row limits. I have watched models invent joins that scan the planet. The server should make that hard.
Google Ads + GA4 read-only (the path I already run). Job: marketing audits with real spend and real conversion paths. Buy for agency and in-house growth teams who currently live in twenty UI tabs. The gotchas are auth and the prompt, not the protocol. Full write-up linked above.
Docs / fetch servers that do progressive discovery. Job: pull the one page you need, not the whole doc site. Buy when the server supports targeted fetch. Skip the ones that embed a vector DB of everything on connect.
Wait
"All-in-one" mega servers with twenty tools. Often one good tool trapped in a mall. Wait until you know which tool you actually call weekly. Prefer small servers you can disable.
Slack / email write access. Read-only search can be useful. Write is how you get a polite agent apologizing in the wrong channel. Wait until you have approval workflows and a human in the loop.
CRM writebacks. Same story. The demo is magical. The mistaken field update is a quarter of pipeline chaos. Wait.
Hosted MCP marketplaces with vague auth. The protocol is open. Your secrets should not be. Wait on anything that wants OAuth to five systems to "get started in one click" without a clear data flow diagram.
Skip
Servers you cannot name a weekly job for. Curiosity installs are how context dies.
Anything that requires broad cloud admin to "try." If the quickstart is "attach Owner," the quickstart is wrong.
Scrapers aimed at ToS-hostile targets. Legal and ban risk is not a flex. Skip.
Duplicate servers for the same job. Two GitHub MCPs do not make you twice as effective. They make tool choice a coin flip mid-thought.
A sane default kit for a small product team
- Filesystem (constrained)
- GitHub read
- One browser tool for QA
- One data read path (warehouse or product DB replica)
- Optional: the marketing pair (Ads + GA4) if that is the business
That is five. If you are past eight, you are probably collecting.
Security notes I wish I had tattooed earlier
- Prefer read-only tokens. Always.
- Rotate anything that ever lived in a screenshot.
- Log tool calls for a week. You will find a server you never meant to leave on.
- Treat MCP like production IAM, not like browser extensions in 2012.
Verdict
Buy small, job-shaped, read-mostly servers that survive a real Tuesday.
Wait on write scopes and mega-bundles until the job is undeniable.
Skip directory tourism and anything that eats the context window as a hobby.
MCP is how agents touch the world. The world includes your ads account, your database, and your reputation. Wire it like you mean it.
Sources
- Connecting Claude to Google Ads and GA4 via MCP (Promptway)
- Firecrawl, Best MCP servers for developers
- Totalum, Best MCP servers 2026
- Cursor / Claude Code MCP docs via vendor documentation portals
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