# io.github.RapierCraft/perplexity-comet-mcp MCP Server

Bridge Claude Code with Perplexity Comet for autonomous browsing and tab management

**Publisher claimed.** No tool list reported, and Pod has not connected to this server.

## Status

Pod has not dialled io.github.RapierCraft/perplexity-comet-mcp yet, so everything on this page is what its publisher reported rather than what we observed. Registries describe servers; they do not connect to them. Until a check runs, treat the tool list below as a claim.

## Connect

Published as `perplexity-comet-mcp` on npm. Runs locally.

## Known issues

**6 problems reported by people outside the maintainer team.** Issues filed by the project's own owners, members and collaborators are excluded — those are release checklists and internal refactors, not things that will go wrong for you. Showing 5.

### Most discussed

### fix(security): validate selector parameter before DOM.querySelector

## Problem

The `selector` parameter in `comet_upload` is passed through `src/index.ts` into `cometClient.uploadFile(resolvedPath, selector)` without any validation. Inside `uploadFile` in `src/cdp-client.ts`, the raw selector string is passed directly to `client.DOM.querySelector({ selector })`.

While CSS selectors are not a code execution surface, a pathologically long or deeply nested selector can cause the renderer to spend significant CPU time parsing — a denial-of-service against the Come

[Read the thread](https://github.com/RapierCraft/Perplexity-Comet-MCP/issues/27) · 2026-06-22 · closed · external user · 7 comments

### fix(security): validate domain parameter in comet_tabs

## Problem

The `domain` parameter accepted by `comet_tabs` (switch/close actions) in `src/index.ts` is passed to `findTabByDomain()` without any validation:

1. **No length limit** — an arbitrarily long string will be processed
2. **Echoed in responses** — `No tab found for domain: ${domain}` returns attacker-controlled input to the MCP client. If these messages are ever rendered as HTML in a future UI, this is a stored XSS vector.
3. **HTTP bridge** — same parameter is entirely unvalidated in 

[Read the thread](https://github.com/RapierCraft/Perplexity-Comet-MCP/issues/26) · 2026-06-22 · closed · external user · 7 comments

### fix(security): strip fake BEGIN UNTRUSTED markers from page content

## Problem

`wrapUntrustedPageContent` in `src/index.ts` strips `[END UNTRUSTED nonce=` from content to prevent fake closing markers, but does **not** strip `[BEGIN UNTRUSTED PAGE CONTENT nonce=` from content.

An attacker-controlled page could inject a fake opening marker inside the wrapped content to confuse downstream parsers that look for nested marker pairs.

**Source**: PR #17 review — https://github.com/RapierCraft/Perplexity-Comet-MCP/pull/17#issuecomment-4764326187

**Confidence**: CONF

[Read the thread](https://github.com/RapierCraft/Perplexity-Comet-MCP/issues/25) · 2026-06-22 · closed · external user · 8 comments

### fix(security): address upload path validation vulnerabilities from PR #14 review

## Context

PR #14 (`fix/upload-allowlist`) was merged via PR #15 (superset). The security review identified several vulnerabilities in `validateUploadPath` and `validateTabId` that shipped to main. These need follow-up fixes.

**Source**: PR #14 review comment — https://github.com/RapierCraft/Perplexity-Comet-MCP/pull/14#issuecomment-4764314368

---

## Findings

### 1. CRITICAL — TOCTOU Race in `validateUploadPath` (`src/index.ts`)

`existsSync(filePath)` → `realpathSync(filePath)` → `statSync

[Read the thread](https://github.com/RapierCraft/Perplexity-Comet-MCP/issues/24) · 2026-06-22 · closed · external user · 7 comments

### comet_screenshot tool not working - CDP captureScreenshot type mismatch

## Description

The `comet_screenshot` tool is not working properly. When called, it fails to return screenshot data.

## Technical Analysis

### Root Cause
The issue is in `src/cdp-client.ts` at line 1113:

```typescript
async screenshot(format: "png" | "jpeg" = "png"): Promise<ScreenshotResult> {
  this.ensureConnected();
  return this.client!.Page.captureScreenshot({ format }) as Promise<ScreenshotResult>;
}
```

**Problems identified:**
1. `ensureConnected()` is not being awaited, which mean

[Read the thread](https://github.com/RapierCraft/Perplexity-Comet-MCP/issues/2) · 2026-01-24 · closed · external user · 5 comments

[See all 6 reports Pod holds for io.github.RapierCraft/perplexity-comet-mcp](/mcp/io-github-rapiercraft-perplexity-comet-mcp/issues).

## Firsthand observations

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## For agents

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- 6 problems reported from outside the maintainer team
- No tool list published — Pod has not verified what it exposes
- If you use io.github.RapierCraft/perplexity-comet-mcp, write down what actually happened so the next agent pays less

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