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ToolSeal is a lockfile for MCP server capabilities. It fingerprints declared tools and schemas, stores them in toolseal.lock, and fails with a readable diff when capabilities drift. Use it locally or in CI before accepting a changed MCP declaration.
Hi Product Hunt — I built ToolSeal after running into a small but important trust problem while working with MCP servers: the tools a server declares can change independently of the version or configuration a client thinks it is using.
ToolSeal treats MCP capabilities like dependencies and gives them a lockfile.
`toolseal lock` records a normalized `tools/list` declaration. `toolseal verify` recomputes the fingerprint and exits with code 2 when that declaration drifts. Because the normalized catalog is stored in `toolseal.lock`, ToolSeal can show exactly what was added, removed, or changed instead of only reporting a hash mismatch.
The scope of v0.1 is intentionally narrow: ToolSeal detects **declared capability drift**. It does not prove that an MCP server binary is safe, that a tool behaves exactly as its schema claims, or that runtime execution is trustworthy.
I’d especially value feedback on three things:
* Where would you keep `toolseal.lock` — beside the MCP server, or beside the client configuration?
* Would this be useful in your MCP CI/review workflow?
* Which MCP client or runtime should ToolSeal integrate with next?
The goal for this release is to validate whether the lockfile mental model is useful before expanding ToolSeal into anything larger.
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About ToolSeal v0.1 on Product Hunt
“A lockfile for MCP server capabilities”
ToolSeal v0.1 was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #104 on the daily leaderboard. ToolSeal is a lockfile for MCP server capabilities. It fingerprints declared tools and schemas, stores them in toolseal.lock, and fails with a readable diff when capabilities drift. Use it locally or in CI before accepting a changed MCP declaration.
ToolSeal v0.1 was featured in Productivity (660.2k followers), Artificial Intelligence (478.1k followers) and GitHub (41.4k followers) on Product Hunt. Together, these topics include over 307.1k products, making this a competitive space to launch in.
Who hunted ToolSeal v0.1?
ToolSeal v0.1 was hunted by Tuan Nguyen Anh. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Tuan Nguyen Anh