# Pebbler Human Feedback (npm · @pebbler/pebbler-mcp)

Buy human image preference comparisons on the Pebbler app with locally controlled USDC payments.

- Trust score: 74/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- npm · `@pebbler/pebbler-mcp`: 74/100 (this document), [markdown](https://verifymcp.io/servers/bridge-applications-pebbler-mcp/pebbler-pebbler-mcp.md), [page](https://verifymcp.io/servers/bridge-applications-pebbler-mcp/pebbler-pebbler-mcp)

## Channel facts

- Registry: `npm`
- Package: `@pebbler/pebbler-mcp`
- Version: `0.1.0`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, 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 2026-11-05.

- **Supply Chain Security**: 90/100
  - No malware found by supply-chain analysis.
  - CVE check failed: a known high-severity CVE affects zod 3.25.76, reached via @x402/core > zod. A fixed version is available.
  - No install/post-install scripts declared.
  - 30 of 111 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 45/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 30 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 68/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 445 tokens (~63/item across 7 items; 7 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 73/100
  - Stability observed for 22 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).
  - 14% 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 7 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 8 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Pebbler Human Feedback MCP server?

Pebbler Human Feedback runs locally as an npm package, launched with npx -y @pebbler/pebbler-mcp. 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 bridge-applications-pebbler-mcp -- npx -y @pebbler/pebbler-mcp
```

### Cursor

```json
{
  "mcpServers": {
    "bridge-applications-pebbler-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@pebbler/pebbler-mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "bridge-applications-pebbler-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@pebbler/pebbler-mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add bridge-applications-pebbler-mcp -- npx -y @pebbler/pebbler-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "bridge-applications-pebbler-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@pebbler/pebbler-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add bridge-applications-pebbler-mcp --command npx --arg -y --arg @pebbler/pebbler-mcp
```

### Hermes

```yaml
mcp_servers:
  bridge-applications-pebbler-mcp:
    command: "npx"
    args: ["-y", "@pebbler/pebbler-mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "bridge-applications-pebbler-mcp": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@pebbler/pebbler-mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add bridge-applications-pebbler-mcp -t stdio -c npx -a -y @pebbler/pebbler-mcp
```

### Other

```json
{
  "mcpServers": {
    "bridge-applications-pebbler-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@pebbler/pebbler-mcp"
      ]
    }
  }
}
```

## 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.

### 2026-11-05 (score 74, 0)

- [functional regression] Security disclosure: unverified → fail

### 2026-11-04 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 67 to 70. That category is still filling its 30-day observation window: 20 days of observed history at the previous scan, 21 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 73, +1)

- [functional regression] Security disclosure: fail → unverified

### 2026-10-31 (score 72, +1)

- [functional regression] Security disclosure: unverified → fail

### 2026-10-30 (score 71, 0)

- [functional regression] Security disclosure: fail → unverified

### 2026-10-28 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-26 (score 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 37 to 40. That category is still filling its 30-day observation window: 11 days of observed history at the previous scan, 12 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-24 (score 69, −2)

- [security regression] CVE-2023-54404 affects this package: high
- [security regression] Known CVEs: pass → fail

## MCP tools (7)

### `get_catalog` (~29 tokens)

Read supported image comparison format, price, respondent slots and schemas. Free; use before creating a study.

### `create_study` (~82 tokens)

Validate an immutable preference comparison with two HTTPS image options. Version 1 supports A vs B image tests only. Free. Reuse request_key to recover a failed creation. Returns the study ID and quote; access credentials stay in the local adapter.

Input parameters:

- `request_key` (string, required): Stable identifier for this creation, reused on retries.
- `study` (object, required)

### `quote_study` (~39 tokens)

Refresh an unpaid study's quote. Free. Do not refresh after signing a payment; recover that purchase instead.

Input parameters:

- `study_id` (string, required)

### `purchase_study` (~78 tokens)

Purchase and schedule the quoted study using the locally configured wallet. Charges USDC, subject to code-enforced budgets. Reuse the original idempotency_key on every retry. Pending payment/launch responses must be recovered through this same tool without another payment.

Input parameters:

- `idempotency_key` (string, required)
- `study_id` (string, required)

### `get_study_status` (~47 tokens)

Get order state and collection progress. Free; honour poll_after_seconds. For pending settlement or launch, retry purchase_study with its original identifiers.

Input parameters:

- `study_id` (string, required)

### `get_study_results` (~45 tokens)

Retrieve aggregate image preference votes. Free and included in purchase. Responses are from incentivised Pebbler app participants and may be incomplete.

Input parameters:

- `study_id` (string, required)

### `list_local_studies` (~39 tokens)

List study IDs and purchase identifiers retained by this adapter. Free; use to recover work after restarting. Does not expose wallet keys or access credentials.

## Diagnostics

Captured diagnostic sections: Provenance, Vulnerabilities, Dependencies. The full working is on the page: https://verifymcp.io/servers/bridge-applications-pebbler-mcp/pebbler-pebbler-mcp#diagnostics

## Score history

- 2026-11-05: 74
- 2026-11-04: 74
- 2026-11-03: 73
- 2026-11-02: 73
- 2026-11-01: 72
- 2026-10-31: 72
- 2026-10-30: 71
- 2026-10-29: 71
- 2026-10-28: 71
- 2026-10-27: 70
- 2026-10-26: 70
- 2026-10-25: 69
- 2026-10-24: 69
- 2026-10-23: 71
- 2026-10-22: 70
- 2026-10-21: 67
- 2026-10-20: 67
- 2026-10-19: 67
- 2026-10-18: 67
- 2026-10-17: 67
- 2026-10-16: 67
- 2026-10-15: 67
- 2026-10-14: 67
- 2026-10-13: 39
- 2026-10-12: 39
- 2026-10-11: 39
- 2026-10-09: 39
- 2026-10-06: 24

## Common questions

### What is the Pebbler Human Feedback MCP server?

Pebbler Human Feedback is an MCP server listed in the public MCP registry as io.github.bridge-applications/pebbler-mcp. Buy human image preference comparisons on the Pebbler app with locally controlled USDC payments. This page covers its npm package (@pebbler/pebbler-mcp).

### Is the Pebbler Human Feedback MCP server safe to use?

Pebbler Human Feedback scores 74 out of 100 on VerifyMCP. We recorded 1 known advisory against it as of 5 November 2026. It declares no install or post-install scripts. 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 Pebbler Human Feedback MCP server expose?

Pebbler Human Feedback exposes 7 tools: get_catalog, create_study, quote_study, purchase_study, get_study_status, and 2 more. Their descriptions and schemas cost roughly 359 tokens of context every time the server is loaded.

### Is the Pebbler Human Feedback MCP server still maintained?

Pebbler Human Feedback is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the Pebbler Human Feedback MCP server under?

Pebbler Human Feedback declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/@pebbler/pebbler-mcp
- Socket report: https://socket.dev/npm/package/@pebbler/pebbler-mcp
- Repository: https://github.com/bridge-applications/pebbler-mcp
- Changelog RSS feed: https://verifymcp.io/servers/bridge-applications-pebbler-mcp/pebbler-pebbler-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/bridge-applications-pebbler-mcp/pebbler-pebbler-mcp.json
- HTML version of this page: https://verifymcp.io/servers/bridge-applications-pebbler-mcp/pebbler-pebbler-mcp