# dev.agentsim/mcp (remote · mcp.agentsim.dev)

Real SIM-backed mobile numbers for AI agents to receive SMS and OTP codes.

- Trust score: 64/100 (medium)
- Change this week: +5
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `mcp.agentsim.dev`: 64/100 (this document), [markdown](https://verifymcp.io/servers/dev-agentsim-mcp/mcp.md), [page](https://verifymcp.io/servers/dev-agentsim-mcp/mcp)

## Channel facts

- Endpoint: `https://mcp.agentsim.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.21.0`

## 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 2026-08-03.

- **Endpoint Security**: 57/100
  - 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 5 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 is enforced; there's no plaintext access path.
  - 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**: 73/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (fair).
  - Tool/resource definitions use about 591 tokens (~84/item across 7 items; 5 tools + 2 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 71/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 0% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http dev-agentsim-mcp https://mcp.agentsim.dev/mcp
```

### Codex

```toml
[mcp_servers.dev-agentsim-mcp]
url = "https://mcp.agentsim.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "dev-agentsim-mcp": {
      "type": "remote",
      "url": "https://mcp.agentsim.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add dev-agentsim-mcp --url https://mcp.agentsim.dev/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  dev-agentsim-mcp:
    url: "https://mcp.agentsim.dev/mcp"
```

### Other

```json
{
  "mcpServers": {
    "dev-agentsim-mcp": {
      "type": "http",
      "url": "https://mcp.agentsim.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.

### 2026-08-03 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-01 (score 63, +1)

No change was recorded against any check on this day. Stability & Change Management went from 17 to 20. That category is still filling its 30-day observation window: 5 days of observed history at the previous scan, 6 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-31 (score 62, +1)

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

### 2026-07-30 (score 61, +1)

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

### 2026-07-28 (score 60, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-27 (score 59, +1)

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

### 2026-07-26 (score 58)

First indexed and scored.

## MCP tools (5)

### `provision_number` (~93 tokens)

Lease a temporary programmable phone number for receiving SMS OTP codes.

Returns the phone number (e164 format) and a session_id needed for all
subsequent calls. The number is reserved for your session for ttl_seconds.

Next step: use the returned `number` on your target service to trigger an SMS,
then call `wait_for_otp` with the returned `session_id`.

Input parameters:

- `input` (object, required)

### `wait_for_otp` (~90 tokens)

Block until an SMS OTP arrives for this session, then return the code.

Polls the AgentSIM API for up to `timeout_seconds`. Returns the OTP code
and the message it was extracted from.

If the OTP does not arrive in time, raises a ToolError with advice on retrying.
Always call `release_number` after you have used the OTP.

Input parameters:

- `input` (object, required)

### `get_messages` (~56 tokens)

List all SMS messages received in this session without consuming the OTP.

Use this to inspect raw messages or check if an SMS arrived before calling
wait_for_otp. Does NOT mark the OTP as consumed.

Input parameters:

- `input` (object, required)

### `release_number` (~47 tokens)

Release a provisioned number back to the pool.

Always call this when you are done with the session — even on error —
to avoid consuming pool capacity unnecessarily.

Input parameters:

- `input` (object, required)

### `list_numbers` (~43 tokens)

List active sessions, optionally filtered by agent_id.

Use this to check for leaked sessions or inspect what numbers are
currently active in your account.

Input parameters:

- `agent_id`

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/dev-agentsim-mcp/mcp#diagnostics

## Score history

- 2026-08-03: 64
- 2026-08-02: 63
- 2026-08-01: 63
- 2026-07-31: 62
- 2026-07-30: 61
- 2026-07-29: 60
- 2026-07-28: 60
- 2026-07-27: 59
- 2026-07-26: 58

## Links

- Remote endpoint: https://mcp.agentsim.dev/mcp
- Repository: https://github.com/agentsimdev/agentsim-mcp
- Changelog RSS feed: https://verifymcp.io/servers/dev-agentsim-mcp/mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/dev-agentsim-mcp/mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/dev-agentsim-mcp/mcp