# Agent Contract Proof (remote · agent-contract-proof.mattskowronis.workers.dev)

Verify an agent's advertised route, price, payment details, and schemas against its live endpoint.

- Trust score: 71/100 (medium)
- Change this week: 0
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-22

## Components

- remote · `agent-contract-proof.mattskowronis.workers.dev`: 71/100 (this document), [markdown](https://verifymcp.io/servers/dev-workers-mattskowronis-agent-contract-proof-verify-agent-contract/agent-contract-proof.md), [page](https://verifymcp.io/servers/dev-workers-mattskowronis-agent-contract-proof-verify-agent-contract/agent-contract-proof)

## Channel facts

- Endpoint: `https://agent-contract-proof.mattskowronis.workers.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-22.

- **Endpoint Security**: 46/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 1 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 69/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 91 tokens (~91/item across 1 items; 1 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 100/100
  - No destabilizing schema changes in the last 30 days.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 1 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 1 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the Agent Contract Proof MCP server?

Agent Contract Proof is a hosted endpoint at https://agent-contract-proof.mattskowronis.workers.dev/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http dev-workers-mattskowronis-agent-contract-proof-v 'https://agent-contract-proof.mattskowronis.workers.dev/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "dev-workers-mattskowronis-agent-contract-proof-v": {
      "url": "https://agent-contract-proof.mattskowronis.workers.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "dev-workers-mattskowronis-agent-contract-proof-v": {
      "type": "http",
      "url": "https://agent-contract-proof.mattskowronis.workers.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.dev-workers-mattskowronis-agent-contract-proof-v]
url = "https://agent-contract-proof.mattskowronis.workers.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "dev-workers-mattskowronis-agent-contract-proof-v": {
      "type": "remote",
      "url": "https://agent-contract-proof.mattskowronis.workers.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add dev-workers-mattskowronis-agent-contract-proof-v --url 'https://agent-contract-proof.mattskowronis.workers.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  dev-workers-mattskowronis-agent-contract-proof-v:
    url: "https://agent-contract-proof.mattskowronis.workers.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "dev-workers-mattskowronis-agent-contract-proof-v": {
      "Transport": "http",
      "Url": "https://agent-contract-proof.mattskowronis.workers.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add dev-workers-mattskowronis-agent-contract-proof-v -t streamable-http -u 'https://agent-contract-proof.mattskowronis.workers.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "dev-workers-mattskowronis-agent-contract-proof-v": {
      "type": "http",
      "url": "https://agent-contract-proof.mattskowronis.workers.dev/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-29 (score 71, 0)

- [security] Stability: 0.97 → pass

### 2026-09-28 (score 71, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-26 (score 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 87 to 90. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-25 (score 69, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-24 (score 69, +1)

No change was recorded against any check on this day. Stability & Change Management went from 80 to 83. That category is still filling its 30-day observation window: 24 days of observed history at the previous scan, 25 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-22 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-19 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-31 (score 0)

- [functional improvement] Stability: unverified → 0.03

## MCP tools (1)

### `verify_agent_contract` (~91 tokens)

Compare an advertised agent contract with its live x402 challenge.

Input parameters:

- `expected_hash` (string): Optional previous contract_hash. A mismatch proves the public contract changed.
- `method` (string): Optional method to probe. If omitted, the advertised method is used, then GET as a fallback.
- `url` (string, required): Public HTTP or HTTPS agent/API URL. An origin URL may be resolved through discovery metadata.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/dev-workers-mattskowronis-agent-contract-proof-verify-agent-contract/agent-contract-proof#diagnostics

## Score history

- 2026-10-22: 71
- 2026-10-21: 71
- 2026-10-20: 71
- 2026-10-19: 71
- 2026-10-18: 71
- 2026-10-17: 71
- 2026-10-16: 71
- 2026-10-15: 71
- 2026-10-14: 71
- 2026-10-13: 71
- 2026-10-12: 71
- 2026-10-10: 71
- 2026-10-06: 71
- 2026-10-04: 71
- 2026-10-03: 71
- 2026-10-02: 71
- 2026-10-01: 71
- 2026-09-30: 71
- 2026-09-29: 71
- 2026-09-28: 71
- 2026-09-27: 70
- 2026-09-26: 70
- 2026-09-25: 69
- 2026-09-24: 69
- 2026-09-23: 68
- 2026-09-22: 68
- 2026-09-21: 67
- 2026-09-20: 67
- 2026-09-19: 67
- 2026-09-18: 66

## Common questions

### What is the Agent Contract Proof MCP server?

Agent Contract Proof is an MCP server listed in the public MCP registry as dev.workers.mattskowronis.agent-contract-proof/verify-agent…. Verify an agent's advertised route, price, payment details, and schemas against its live endpoint. This page covers its hosted endpoint (https://agent-contract-proof.mattskowronis.workers.dev/mcp).

### Is the Agent Contract Proof MCP server safe to use?

Agent Contract Proof scores 71 out of 100 on VerifyMCP. 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 Agent Contract Proof MCP server expose?

Agent Contract Proof exposes 1 tool: verify_agent_contract. Their descriptions and schemas cost roughly 91 tokens of context every time the server is loaded.

### Does the Agent Contract Proof MCP server require authentication?

No. We connected to Agent Contract Proof without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Agent Contract Proof MCP server still maintained?

Agent Contract Proof is still listed as active in the MCP registry. We last reached this channel on 22 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://agent-contract-proof.mattskowronis.workers.dev/mcp
- Website: https://skowronworks.com/agent-tools/agent-contract-proof/
- Changelog RSS feed: https://verifymcp.io/servers/dev-workers-mattskowronis-agent-contract-proof-verify-agent-contract/agent-contract-proof.xml
- Changelog JSON feed: https://verifymcp.io/servers/dev-workers-mattskowronis-agent-contract-proof-verify-agent-contract/agent-contract-proof.json
- HTML version of this page: https://verifymcp.io/servers/dev-workers-mattskowronis-agent-contract-proof-verify-agent-contract/agent-contract-proof