# Annalist MCP Tool Change Monitor

> Annalist MCP Tool Change Monitor is a paid API for AI agents from api.annalist.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-16).

Returns a signed, chronological feed of tool additions, removals, and redefinitions across Official MCP Registry servers to detect rug-pull-style attacks

## Facts

- Endpoint: GET https://api.annalist.dev/v1/mcp/changes?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/annalist-mcp-tool-change-monitor-34aa851e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_h6oGl0VSQFNBWWiRPQQRm

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability annalist-mcp-tool-change-monitor-34aa851e
```

Example prompt: Show me all tool changes in the Official MCP Registry over the last 14 days — I want to know which MCP servers had tools added, removed, or redefined so I can spot any suspicious rug-pull updates before I trust them again.

## When to prefer this

Use this endpoint specifically when you need to audit or monitor MCP server tool definitions for unexpected changes — especially before re-approving a previously trusted server, detecting rug-pull-style supply chain attacks, or compiling a change digest across the Official MCP Registry. It is the only known signed, independent source for daily tool fingerprint diffs across the registry.

## Known failure modes

- Invalid days parameter (outside 1–30 range) returns an error
- Unknown server name or URL returns empty results or a not-found error
- Both name and url provided simultaneously may produce ambiguous results
- Registry API downtime causes upstream failures
- Signed response verification failure may indicate tampered data in transit

## How this service works

Tool changes across remote MCP servers in the Official MCP Registry, newest first: tools added, removed or redefined (description, input schema or annotations), from our daily fingerprints. A tool that changes after you approved it is how 'rug pull' attacks work, so check before trusting a server again. Last 1 to 30 days, or one server with name= or url=. Servers whose tools change by design are marked. Signed.

## Output

A signed, chronologically ordered list of tool change events from the Official MCP Registry, including which server changed, what tool was affected, the type of change (added, removed, or redefined — covering description, input schema, or annotations), and timestamps. Servers whose tools change by design are flagged. The response is cryptographically signed for tamper-evidence.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "url": {
       "type": "string",
       "description": "optional: one server by its URL"
      },
      "days": {
       "type": "string",
       "description": "how many days back, 1 to 30 (default 7)"
      },
      "name": {
       "type": "string",
       "description": "optional: one server by its registry name, for example io.github.user/server"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/annalist-mcp-tool-change-monitor-34aa851e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.annalist.dev](https://www.zero.xyz/host/api.annalist.dev/llms.txt)