io.github.theoddden/stamp

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

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

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "stamp": {
      "url": "https://stamp-mcp.terradev.cloud/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (6)

• get_time

  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.

  Parameters:

  • server — string — NTP server to query
  • timezone — string — IANA timezone for a 'local' field, e.g. America/New_York. Optional -- the HTTP transport also takes ?tz= in the URL.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• generate_uuid

  Generate one or more random UUIDv4 identifiers -- for records, sessions, and IDs created in agent pipelines.

  Parameters:

  • count — integer — How many UUIDs to generate

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• diff

  Unified diff between two texts, with added/removed line counts. For reviewing edits, comparing outputs, or validating transformations.

  Parameters:

  • text_a (required) — string — Original text
  • text_b (required) — string — Revised text
  • context — integer — Lines of context around each change

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• calculate

  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.

  Parameters:

  • expression (required) — string — e.g. "(1500 * 0.23) + 47"

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• attest

  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.

  Parameters:

  • payload (required) — Any JSON value to attest
  • server — string — NTP server for the verified timestamp

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• verify

  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.

  Parameters:

  • attested (required) — object — The record returned by attest

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

Repository

Measured by MCPYP probing. Untested fields are omitted, never estimated. Listing is always free; MCPYP never proxies calls or stores user tokens.