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Independent measurements of remote MCP servers. Every observation has a timestamp.

Read-only probes

MCP server · Code & DevOps

Zovo Venn

By theluckystrike

Compares 2 or 3 lists and draws a Venn diagram, with a CSV table of the region of each item.

WebsiteSource code
Connect to Zovo Venn
Checks passed
12 / 22

2 failed · 8 not measured

Median response
68 ms

Median of successful probes over 7 days

30-day uptime
Not measured

Share of countable probes over 30 days, including daily rollups. Auth challenges are excluded.

Discovered tools
2

Tool definitions returned by this server

Independent monitoring

Health & checks

Status history

Outdated check

Last connection measurement is over 24 hours old. Current availability is unknown.

Last checked
Check summary by test group
Test areaPassedFailedUnmeasured
ConnectionCan a client connect and discover tools?
500
Reliability & speedDoes it respond consistently and quickly?
004
Access & authenticationWhat is required to use this server?
102
Tool qualityAre the tool definitions usable by an agent?
400
Publisher identityCan the publisher be traced to its source?
222

Unmeasured means there is not enough evidence to decide. How these checks work

Inspect individual checks 22 recorded

Core

  • Pass
    Reachable

    Latest probe returned HTTP 200 in 68 ms.

  • Pass
    Valid handshake

    protocolVersion 2025-11-25, serverInfo.name venn-diagram.

  • Pass
    Lists tools

    tools/list returned 2 tools.

  • Pass
    Current protocol

    Negotiated 2025-11-25. The bar is 2025-06-18 or newer.

  • Pass
    HTTPS

    The endpoint URL is https.

Performance

  • Not measured
    Fast (p50)

    Median latency 68 ms over 1 samples in 7 days. The bar is 1000 ms. Need at least 5 samples.

  • Not measured
    Consistent (p95)

    95th percentile 68 ms over 1 samples in 7 days. The bar is 3000 ms. Need at least 20 samples.

  • Not measured
    Reliable (uptime)

    1 of 1 attempts returned a tool list in 30 days (100%). The bar is 99%. Need at least 30 samples.

  • Not measured
    Stable tool list

    Fewer than two successful probes in 30 days, so tool-list stability is not measured.

Access

  • Pass
    Open access

    tools/list succeeded with no credential, and the record declares none.

  • Not measured
    Standard auth

    Auth is not required, so the OAuth metadata check does not apply.

  • Not measured
    Free tier cited

    No publisher quote has been checked.

Tools

  • Pass
    Tools described

    Every tool description is at least 20 characters.

  • Pass
    Valid input schemas

    Every inputSchema is a JSON Schema object.

  • Pass
    Parameters documented

    8 of 8 parameters have a description (100%). The bar is 80%.

  • Pass
    Safety hints

    Every tool sets readOnlyHint or destructiveHint.

Publisher

  • Pass
    Verified namespace

    Listed in the Official MCP Registry.

  • Not measured
    Website matches publisher

    This namespace is not a reverse domain, so the website comparison does not apply.

  • Fail
    Source repo linked

    No repository URL is on file.

  • Fail
    Repo owner matches

    The GitHub repository owner does not match the namespace login.

  • Pass
    Recently updated

    Updated 2026-11-08T02:15:23.782318Z, within 180 days.

  • Not measured
    Open-source licence

    No GitHub repository to ask about a licence.

Start using Zovo Venn

Connect to this server

Choose your client, copy the configuration, then enable the server in your client’s MCP settings.

Run this command in your terminal, then restart Claude Code.

Claude Code

claude mcp add --transport http zovo-venn https://venn-diagram.zovo.one/mcp

Capabilities

Tools 2

compare_lists

Use this when the user wants to know which items 2 or 3 lists share and which are unique, without a diagram, for example "which names are on both lists" or "compare these three guest lists". Takes 2 or 3 named lists (up to 500 items each, 80 characters per item) and a case option. Returns each region (only A, only B, A and B, ...) with its count and items, the overlap percentage for each pair, and a CSV with each item's region. Does not read files, does not fuzzy-match spellings, and does not draw a diagram.

Discovered
make_venn

Use this when the user wants a Venn diagram of 2 or 3 lists or groups, for example "Venn diagram of these two customer lists" or "draw the overlap of skills for 3 candidates". Takes 2 or 3 named sets of items (up to 500 per set, 80 characters per item) or only region counts, a layout (symmetric, or proportional for 2 sets) and a case option. Returns the count of each region, which items are drawn, a check that each drawn label sits inside its region, an interactive diagram, and SVG, PDF and CSV downloads. Does not read files or images, and does not draw 4 or more sets. Lists are not kept after the call; download files of large diagrams are stored for 1 hour.

Discovered

Recent measurements

Probe history

View status
Latest stored probes. Raw probe rows are kept for 14 days.
CheckedResultResponseTools
Connected68 ms2

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