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║ ███████╗ █████╗ ██╗ ██╗██████╗ ██████╗ ║
║ ██╔════╝██╔══██╗╚██╗ ██╔╝██╔══██╗██╔═══██╗ ║
║ ███████╗███████║ ╚████╔╝ ██║ ██║██║ ██║ ║
║ ╚════██║██╔══██║ ╚██╔╝ ██║ ██║██║ ██║ ║
║ ███████║██║ ██║ ██║ ██████╔╝╚██████╔╝ ║
║ ╚══════╝╚═╝ ╚═╝ ╚═╝ ╚═════╝ ╚═════╝ ║
║ ║
║ does the tool do what it says ║
║ ║
╚════════════════════════════════════════════════════════════════════════════════════════════╝
Does the tool do what it says? Not is it safe, not is it good. A publisher declares what an MCP tool does in a signed contract; SayDo runs the tool in a sandbox, checks it against that contract, and emits a hash-chained receipt anyone can verify in a browser with no account and no trust in the issuer.
The MCP server
pip install "saydo[mcp]"
saydo-mcp
Four tools, and the first one is a refusal:
| tool | answers |
|---|---|
scope |
what SayDo cannot settle. Call it first. |
status |
whether a package has a receipt, and what that receipt establishes |
inspect_definition |
the RFC 8785 tool digest, and wording aimed at the model rather than at a reader |
check_now |
run a package in a sandbox and report what it did |
Most packages have no receipt, so the usual answer is unknown. That keeps
meaning nobody has looked. It never softens into probably fine.
What a verdict can be
pass the declared behaviour held under the run
fail the tool did something it declared it would not
not-covered the run established nothing either way
A whole run resolves to CONFORMANT, NOT CONFORMANT, or INCONCLUSIVE.
INCONCLUSIVE carries most of the weight. A server that declines every call
makes no network request the way an unplugged machine makes none, and a harness
that scores that as three passes has certified nothing at all. A negative claim
passes here only if the run observed the tool actually doing something.
What this is not
It is not a safety guarantee and no receipt should be presented as one. It says what one version of one tool did on one run, against a contract its author wrote beforehand. Drift detection and hash-chained receipts are not novel; the repository names the prior art rather than claiming otherwise.
check_now needs Docker and the repository, and refuses plainly when it does
not have them rather than running something weaker and reporting it as a
sandboxed result.
Source, specification, the browser verifier, and the seeded fixtures that exist to prove the harness can fail: https://github.com/vince-gonzalez/saydo
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║ ███████╗ ██╗ ██╗███████╗██╗ ██╗███████╗ ║
║ ██╔════╝ ██║ ██╔╝██╔════╝╚██╗ ██╔╝██╔════╝ ║
║ █████╗ █████╗█████╔╝ █████╗ ╚████╔╝ ███████╗ ║
║ ██╔══╝ ╚════╝██╔═██╗ ██╔══╝ ╚██╔╝ ╚════██║ ║
║ ██║ ██║ ██╗███████╗ ██║ ███████║ ║
║ ╚═╝ ╚═╝ ╚═╝╚══════╝ ╚═╝ ╚══════╝ ║
║ ║
║ · C R E A T I V E · ║
║ ║
║ ──────────────────────────────────────── ║
║ ║
║ Vincent Gonzalez ║
║ f-keys.com ║
║ ORCID 0009-0005-3640-014X ║
║ ║
╚════════════════════════════════════════════════════════════╝
Part of F-Keys — independent hardware, software and internet products.
1 maintainer
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