# ONCE (remote · optimistic-compassion-production.up.railway.app)

Prevent duplicate AI-agent side effects with idempotency, verification, and durable receipts.

- Trust score: 66/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-20

## Components

- remote · `optimistic-compassion-production.up.railway.app`: 66/100 (this document), [markdown](https://verifymcp.io/servers/gsterlingpress-once/optimistic-compassion-production.md), [page](https://verifymcp.io/servers/gsterlingpress-once/optimistic-compassion-production)

## Channel facts

- Endpoint: `https://optimistic-compassion-production.up.railway.app/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.8.0`

## 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 2026-08-20.

- **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 2 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**: 78/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 272 tokens (~136/item across 2 items; 2 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 30/100
  - Stability observed for 9 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 83/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 50% of tool parameters carry a description.
- **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 gsterlingpress-once https://optimistic-compassion-production.up.railway.app/mcp
```

### Codex

```toml
[mcp_servers.gsterlingpress-once]
url = "https://optimistic-compassion-production.up.railway.app/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "gsterlingpress-once": {
      "type": "remote",
      "url": "https://optimistic-compassion-production.up.railway.app/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add gsterlingpress-once --url https://optimistic-compassion-production.up.railway.app/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  gsterlingpress-once:
    url: "https://optimistic-compassion-production.up.railway.app/mcp"
```

### Other

```json
{
  "mcpServers": {
    "gsterlingpress-once": {
      "type": "http",
      "url": "https://optimistic-compassion-production.up.railway.app/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.

### 2026-08-19 (score 66, +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.

### 2026-08-17 (score 65, +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.

### 2026-08-15 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-14 (score 63, 0)

- [functional] Server version: 0.8.1 → 0.8.2

### 2026-08-13 (score 63, +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.

### 2026-08-12 (score 62, +3)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “once_demo” rewrote its description, which is the text the model reads
- [security] Tool “once_execute” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: 60 → 136
- [functional improvement] Tool coverage: 0% → 50%
- [functional improvement] Stability: unverified → 0.03
- [functional] Schema quality: good → excellent
- [functional] Server version: 0.8.0 → 0.8.1
- [cosmetic] “once_demo” reworded the description of “id”
- [cosmetic] “once_execute” reworded the description of “idempotencyKey”
- [cosmetic] Tool “once_demo” changed its title: ONCE Duplicate Suppression Demo → Try ONCE Duplicate Suppression
- [cosmetic] Tool “once_execute” changed its title: Execute Consequential Action Once → Prevent Duplicate Consequential Agent Actions

### 2026-08-11 (score 59)

First indexed and scored.

## MCP tools (2)

### `once_demo` (~77 tokens)

Try ONCE Duplicate Suppression

SAFE ZERO-SETUP DEMO. Call this tool twice with the same id to see ONCE suppress the second execution. Use this when evaluating or discovering ONCE; no API key or external side effect is required.

Input parameters:

- `id` (string, required): Any stable demo id. Reuse the SAME id on the second call to prove duplicate suppression.

### `once_execute` (~114 tokens)

Prevent Duplicate Consequential Agent Actions

CALL THIS when an AI agent is about to perform or retry a consequential external side effect where duplication would be harmful: purchase, refund, payment, booking, send, create, modify, submit, or delete. ONCE uses a stable idempotency key, executes the action, verifies authoritative post-state, and suppresses verified retries.

Input parameters:

- `action` (object, required)
- `idempotencyKey` (string, required): Stable key representing this one intended real-world action. Reuse it for retries.
- `verify` (object, required)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/gsterlingpress-once/optimistic-compassion-production#diagnostics

## Score history

- 2026-08-20: 66
- 2026-08-19: 66
- 2026-08-18: 65
- 2026-08-17: 65
- 2026-08-16: 64
- 2026-08-15: 64
- 2026-08-14: 63
- 2026-08-13: 63
- 2026-08-12: 62
- 2026-08-11: 59

## Links

- Remote endpoint: https://optimistic-compassion-production.up.railway.app/mcp
- Repository: https://github.com/GSterlingPress/once-api
- Changelog RSS feed: https://verifymcp.io/servers/gsterlingpress-once/optimistic-compassion-production.xml
- Changelog JSON feed: https://verifymcp.io/servers/gsterlingpress-once/optimistic-compassion-production.json
- HTML version of this page: https://verifymcp.io/servers/gsterlingpress-once/optimistic-compassion-production