# Dataset Diff & Change Detector

> Compare two versions of a JSON row list: what was added, removed or changed, field by field.

- name: io.github.Nero-Engine/dataset-diff-detector
- version: 0.1.0
- connection class: R0 (autonomous)
- trust: 94/100
- quality: 79/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/io.github.Nero-Engine%2Fdataset-diff-detector
- tools: https://api.protogrid.dev/v1/servers/io.github.Nero-Engine%2Fdataset-diff-detector/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "dataset-diff-detector": {
      "type": "http",
      "url": "https://dataset-diff-detector.nerolabs.workers.dev/mcp"
    }
  }
}
```


## Trust

- hygiene: 100
- liveness: 99
- freshness: 85
- provenance: 90
- drivers: +repository +namespace-matches-repo +website +reachable +uptime-97% ~updated-38d-ago
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 79/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-06-18; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 71 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- fail `tools.annotations`: no tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: list_capabilities (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); diff_rows (readOnlyHint, destructiveHint, idempotentHint, openWorldHint)
- pass `tools.token_cost`: about 645 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: no tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 2, about 645 tokens to load them all
- tool set hash: 8700423c2329855a312c29651eb33e40
- badge: [![protogrid quality](https://protogrid.dev/badge/io.github.Nero-Engine/dataset-diff-detector.svg)](https://protogrid.dev/servers/io.github.Nero-Engine/dataset-diff-detector)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://dataset-diff-detector.nerolabs.workers.dev/mcp (streamable-http, auth none, reachable true, uptime30d 0.9655172)

## Packages

_none_

## Tools (2)

- `diff_rows`: Compares two versions of the same list of JSON rows (a before and an after snapshot, such as yesterday's and today's price list, product feed or CRM export) and returns one row per difference: status added, removed or changed, the key, the old and new values, and changedFields naming exactly which fields moved. Set keyFields to the field(s) that identify a row (sku, id, email); without it rows match on full content and an edited row shows as removed plus added. Comparison is exact: "19.99" (text) and 19.99 (a number) differ, as do "Blue" and "blue " and null and a missing field; nested objects compare by value. Put always-changing fields such as timestamps in ignoreFields. The summary counts added, removed, changed and unchanged rows and warns about duplicate keys, rows missing a key, and field names found in no row. oldRows and newRows together are limited per call (list_capabilities gives the number); larger calls are refused with a message saying how to split them.
- `list_capabilities`: Returns the exact matching and comparison rules diff_rows uses, the shape and order of its output rows, and the maximum rows per call. Call this first if you are unsure how values are compared. Free, processes no data.