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Measure what an MCP server's tool list costs in tokens each session and name the tools that cost most.

Manifest costFreeFor agent builders and developers

Better than by hand

Gives a per-tool figure before you add a server, so the choice does not rest on a guess. We do not put a time on it.

Before: what you give it

The example input, as typed in. You give it an MCP endpoint address.

https://preflight.allthepossibles.com/mcp

After: what comes back

The first lines of a real run of the tool's own code on that input, fetched live when the sample was made, so the live page can differ from it. Nothing here is edited by hand.

preflight: 4 tools, about 1,032 tokens per session start
Most expensive:
  scan_extension  ~339 tokens
    description is 731 chars; most of it is read on every session
  scan_mcp_server  ~263 tokens
  check_output  ~249 tokens
(estimate: JSON chars / 3.8, base64 runs at 1.5 chars per token)

What you get

Tokens per session start, a per-tool estimate, the three most expensive tools and flags on oversized descriptions

What it cannot do

The figure is an estimate from character counts (stated in the output), not the exact count from a model's tokenizer.

Who it is for

  • Agent builders
  • Developers

Free and Pro

Free10 runs a day per IP address.
ProNo daily limit, 300 requests a minute.

Daily caps for every tool

Use it from your assistant

The tool is called manifest_cost. Connect the server once, then ask for it by name or describe the job. Install steps.

claude mcp add --transport http toolbox https://toolbox.allthepossibles.com/mcp
curl -X POST https://toolbox.allthepossibles.com/api/manifest-cost -H 'content-type: application/json' -d '{"url":"https://preflight.allthepossibles.com/mcp"}'

Try it here

The form starts with the same example input, so you can run it first and then swap in your own.

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