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Oeis

NPM · @PIPEWORX/MCP-OEIS · 2 COMPONENTS

OEIS (On-Line Encyclopedia of Integer Sequences) MCP. Authoritative database of integer sequences.…

Available components

remote · gateway.pipeworx.io 85 npm · @pipeworx/mcp-oeis 83
+3 this week 83 Trust /100

Last scanned (13 hours ago)

Scores higher than 76% of npm servers

Category Education and Research

Trust breakdown (7 categories)

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. How we score → Why this is hard to score →

Supply Chain Security100
  • No malware found by supply-chain analysis.Pass
  • No known CVEs affecting this package version or its production dependencies.Pass
  • No install/post-install scripts declared.Pass
  • No production dependencies, so there is no dependency health to assess. View diagnostics → Pass
Provenance & Transparency97
  • Source repository is publicly reachable at the declared URL. View diagnostics → Pass
  • Cryptographically verified build provenance (signed, bound to pipeworx-io/mcp-oeis). View diagnostics → Pass
  • Clear OSI-approved license (MIT).Pass
  • Actively maintained (last published 1 days ago).Pass
  • Disclosure check failed: no security disclosure policy was found in the source repository. See how to fix → Fail
Schema Quality & AI Usability69
  • AI-judged instruction clarity (good).Pass
  • Context-footprint check failed: tool/resource definitions use about 402 tokens (~201/item across 2 items; 2 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
  • Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management23
  • Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
  • 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
  • 100% of tool parameters carry a description.Pass
Tool Safety100
  • No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
  • We read all 2 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
  • An AI judge read all 3 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
  • Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Changelog

Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.

  • 4 Nov 26 +16
    • Malware scan: unverified → pass ▲ security
  • 3 Nov 26 −13
    • Malware scan: pass → unverified ▼ security
    • Stability: unverified → 0.17 ▲ functional
    • Package version: 0.2.0 → 0.2.1 functional
  • 30 Oct 26 0
    • Security disclosure: unverified → fail ▼ functional
  • 29 Oct 26 80

    First indexed and scored.

Diagnostics

Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.

Captured 5 Nov 2026 · Analysed npm/@pipeworx/mcp-oeis@0.2.1

Provenance Verified

A signed build attestation was found and verified, binding this exact artifact to the source repository it claims to come from.

Result Verified
Ecosystem npm
Reason Verified
Discovered via Registry attestation endpoint
Source repo pipeworx-io/mcp-oeis
Certificate issuer https://token.actions.githubusercontent.com
Certificate SAN https://github.com/pipeworx-io/mcp-oeis/.github/workflows/publish.yml@refs/heads/main
Rekor log index 3679614975
Predicate type SLSA build provenance https://slsa.dev/provenance/v1
Subject digest sha512:11826ad0eb5aa00a92ce104013ab735eaafff1cf5f369c1b2f928aa50d7828c4bcfd697013294abf890a6655294fa18fbc758636ee2521bcecf85e502

Background: How many MCP packages publish verified provenance →

Dependencies 0 packages
Packages resolved 0
Tree resolution Complete

Background: SBOMs and build attestations, explained →

MCP tools · 2 exposed · ~349 tokens

The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →

Tool Tokens
get_sequence ~142

Fetch a single OEIS integer sequence by its A-number (e.g. "A000045" for the Fibonacci numbers, "A000040" for the primes). Accepts the A-number with or without the "A" prefix and zero-padding ("A000045", "45", and "000045" are all valid). Returns the full record: name, terms (data), comments, formulas, keywords, offset, author, and reference count. Use this to get the formula or mathematical description of a known sequence.

NameTypeReqDescription
idstringyesAn OEIS A-number such as "A000045", or just "45" / "000045".

No output schema declared.

No examples provided.

search_sequence ~207

Search the OEIS (On-Line Encyclopedia of Integer Sequences), the authoritative database of integer sequences. Identify a sequence from its first terms by passing a comma-separated list of integers (e.g. "1,1,2,3,5,8" finds the Fibonacci numbers), look up a specific sequence by A-number (e.g. "A000045"), or search free-text keywords (e.g. "prime gaps"). Returns up to 10 matching sequences per page with their A-number, name, terms, keywords, author, and offset. Use the start argument to paginate (10 results at a time).

NameTypeReqDescription
querystringyesA comma-separated list of integers (e.g. "1,1,2,3,5,8"), an A-number (e.g. "A000045"), or free-text keywords (e.g. "prime gaps").
startnumber–Pagination offset; results come 10 at a time. Default 0.

No output schema declared.

No examples provided.

Install

How do I install the Oeis MCP server?

Oeis runs locally as an npm package, launched with npx -y @pipeworx/mcp-oeis. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

npm · @pipeworx/mcp-oeis

# add to Claude Code
claude mcp add pipeworx-io-oeis -- npx -y @pipeworx/mcp-oeis
Common questions

What is the Oeis MCP server?

Oeis is an MCP server listed in the public MCP registry as io.github.pipeworx-io/oeis. OEIS (On-Line Encyclopedia of Integer Sequences) MCP. Authoritative database of integer sequences.… This page covers its npm package (@pipeworx/mcp-oeis).

Is the Oeis MCP server safe to use?

Oeis scores 83 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 5 November 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

What tools does the Oeis MCP server expose?

Oeis exposes 2 tools: search_sequence, get_sequence. Their descriptions and schemas cost roughly 349 tokens of context every time the server is loaded.

Is the Oeis MCP server still maintained?

Oeis is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

What licence is the Oeis MCP server under?

Oeis declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.