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booklint stamp

by booklint.com · remote · no sign-in to list tools · v0.1.0 · published by com.booklint

Signed timestamp receipts for a SHA-256 hash. Send only the hash; we never see the document.

Changes · 2
CompareRegistry entry

2 tools: 2 change things.

Scanned Oct 21, 2026

2 checks matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http stamp https://booklint-stamp.fly.dev/mcp

Findings

Matches of fixed checks, with the text they matched.

2 warn
  • Warnstamp_hash

    The server marks "stamp_hash" as not read-only (readOnlyHint: false), and its words say it reads.

    Matched text

    annotations: {"readOnlyHint":false,"idempotentHint":false,"openWorldHint":false}; The description's first verb is "return": a word for reading.

    What this check looks for
  • Warnverify_receipt

    The server marks "verify_receipt" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

    Matched text

    annotations: {"readOnlyHint":true,"idempotentHint":true,"openWorldHint":false}; The input takes a statement or command to run (input.statement), which can change anything it can reach.

    What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

2 tools

Changes things 2Claude Code: ask
  • stamp_hashReturns a signed receipt {sha256, stamped_at, key_id, signature, public_key_url}: a booklint-family service saw this hash at stamped_at, signed with key key_id.1 finding

    Why it is in this group

    • The description's first verb is "return": a word for reading.
    • The server marks it as not read-only (readOnlyHint: false).

    Findings

    • Warn

      The server marks "stamp_hash" as not read-only (readOnlyHint: false), and its words say it reads.

      Matched text

      annotations: {"readOnlyHint":false,"idempotentHint":false,"openWorldHint":false}; The description's first verb is "return": a word for reading.

      What this check looks for
    Description, as the server wrote it
    Returns a signed receipt {sha256, stamped_at, key_id, signature, public_key_url}: a booklint-family service saw this hash at stamped_at, signed with key key_id. Send ONLY a SHA-256 hex digest (64 characters). We never see or store the document — only the hash you send. This is not legal proof, notary service, evidence, or a certificate of anything. Not advice.

    Annotations the server declares

    • readOnlyHint: false
    • idempotentHint: false
    • openWorldHint: false
  • verify_receiptChecks a receipt from stamp_hash against the published public keys (same check as POST /v1/verify; pass the receipt fields as arguments).1 finding

    Why it is in this group

    • The input takes a statement or command to run (input.statement), which can change anything it can reach.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    Findings

    • Warn

      The server marks "verify_receipt" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

      Matched text

      annotations: {"readOnlyHint":true,"idempotentHint":true,"openWorldHint":false}; The input takes a statement or command to run (input.statement), which can change anything it can reach.

      What this check looks for
    Description, as the server wrote it
    Checks a receipt from stamp_hash against the published public keys (same check as POST /v1/verify; pass the receipt fields as arguments). Returns valid true or false with a reason. valid true means only that this service signed that hash and time with that key. This is not legal proof, notary service, evidence, or a certificate of anything.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 0.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http stamp https://booklint-stamp.fly.dev/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [],
    "ask": [
      "mcp__stamp__stamp_hash",
      "mcp__stamp__verify_receipt"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as stamp. Review it before you use it.