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io.github.theoddden/stamp

by theoddden · remote · local (pypi) · no sign-in to list tools · v0.6.1 · published by GitHub user theoddden

Concierge MCP for agentic workflows: verified time + drift, uuid, diff, calc, attest, verify.

Changes · 4
CompareRegistry entry

6 tools: 4 change things and 2 only read.

Scanned Oct 21, 2026

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

claude mcp add --transport http stamp https://stamp-mcp.terradev.cloud/mcp

Tools

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

6 tools

Changes things 4Claude Code: ask
  • attestWrap any payload in a tamper-evident record: a UUID, a timestamp (NTP-verified when reachable, local clock otherwise -- the record says which), and a sha256 over the canonical reco…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Wrap any payload in a tamper-evident record: a UUID, a timestamp (NTP-verified when reachable, local clock otherwise -- the record says which), and a sha256 over the canonical record. One call, the record is complete and tamper-evident.
  • calculateEvaluate a math expression safely: + - * / // % **, parentheses, functions (abs round min max sqrt floor ceil exp log log2 log10 pow sin cos tan), constants pi e tau inf.No findings

    Why it is in this group

    • The description's first verb is "evaluate": a word for a change.
    Description, as the server wrote it
    Evaluate a math expression safely: + - * / // % **, parentheses, functions (abs round min max sqrt floor ceil exp log log2 log10 pow sin cos tan), constants pi e tau inf. Parsed to an AST and only whitelisted nodes are computed -- no eval(), no names, no arbitrary code.
  • generate_uuidGenerate one or more random UUIDv4 identifiers -- for records, sessions, and IDs created in agent pipelines.No findings

    Why it is in this group

    • The name "generate_uuid" says "generate": a word for a change.
    Description, as the server wrote it
    Generate one or more random UUIDv4 identifiers -- for records, sessions, and IDs created in agent pipelines.
  • verifyCheck a record produced by attest: recompute the sha256 over the record and compare.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Check a record produced by attest: recompute the sha256 over the record and compare. Pass/fail -- did this payload produce this hash at this timestamp. Any modified field breaks it.
Only reads 2Claude Code: allow
  • diffUnified diff between two texts, with added/removed line counts.No findings

    Why it is in this group

    • The name "diff" says "diff": a word for reading.
    Description, as the server wrote it
    Unified diff between two texts, with added/removed line counts. For reviewing edits, comparing outputs, or validating transformations.
  • get_timeQuery an NTP server for current UTC time and this clock's offset.No findings

    Why it is in this group

    • The name "get_time" says "get": a word for reading.
    Description, as the server wrote it
    Query an NTP server for current UTC time and this clock's offset. Appends the sample to the drift log and returns the trend inline: current offset, drift rate (ms/day), and whether the clock is stable, drifting, or accelerating.

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 0.6.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http stamp https://stamp-mcp.terradev.cloud/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": [
      "mcp__stamp__get_time",
      "mcp__stamp__diff"
    ],
    "ask": [
      "mcp__stamp__generate_uuid",
      "mcp__stamp__calculate",
      "mcp__stamp__attest",
      "mcp__stamp__verify"
    ],
    "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.