I
io.github.Rul1an/assay
@modelcontextprotocol/server-filesystem
The firewall for MCP tool calls. Block, audit, replay with evidence bundles.
2 open CVEs
MIT license
Actively maintained
Last commit 5d ago
Works with most clients
Transport: stdio, sse, http
0 tools
Grade F
MCPpedia last refreshed this data
io.github.Rul1an/assay is an MCP server that the firewall for MCP tool calls. Block, audit, replay with evidence bundles. Its tool list has not been published yet over stdio, sse and http, requires no API key, and scores 53/100 on MCPpedia's security, maintenance and efficiency rubric.
Step 1
Install in your client
Config is the same across clients — only the file and path differ.
CD
Supported in Claude Desktopstdio, sse, http · Node 18+
Paste into ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"io-github-rul1an-assay-rul1an": {
"args": [
"-y",
"@modelcontextprotocol/server-filesystem"
],
"command": "npx"
}
}
}Are you the author?
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What io.github.Rul1an/assay does
Agents got real tool access through MCP — and tool poisoning, rug pulls, and confused-deputy OAuth came with it. Most tools scan a server or filter a prompt. Assay sits at the tool-call boundary and does three things, in order.
Test This Server
Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.
npx -y '@modelcontextprotocol/server-filesystem' 2>&1 | head -1 && echo "✓ Server started successfully"
After testing, let us know if it worked:
Scored, not listed
Why this score
Five weighted categories — click any category to see the underlying evidence.
Score breakdown
53/100across 5 weighted dimensions
0255075100
13
16
14
10
−47
Security
Maintenance
Efficiency
Documentation
Compatibility
Categoriesclick a row to see evidence
Security
OSV.dev2 open
CVE-2025-53110high
@modelcontextprotocol/server-filesystem vulnerability allows for path validation bypass via colliding path prefix
Versions of Filesystem prior to 0.6.3 & 2025.7.1 could allow access to unintended files in cases where the prefix matches an allowed directory. Users are advised to upgrade to 2025.7.1 to resolve the issue. Thank you to Elad Beber (Cymulate) for reporting these issues.
Affected:
>= 0source →CVE-2025-53109high
@modelcontextprotocol/server-filesystem allows for path validation bypass via prefix matching and symlink handling
Versions of Filesystem prior to 0.6.3 & 2025.7.1 could allow access to unintended files via symlinks within allowed directories. Users are advised to upgrade to 2025.7.1 to resolve. Thank you to Elad Beber (Cymulate) for reporting these issues.
Affected:
>= 0source →Community
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Frequently Asked Questions
- Is io.github.Rul1an/assay safe to use?
- io.github.Rul1an/assay has 2 known CVEs tracked by MCPpedia. You can verify these on OSV.dev by searching for "@modelcontextprotocol/server-filesystem". Review the Security section above for details before installing.
- How do I install io.github.Rul1an/assay?
- io.github.Rul1an/assay supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
- What AI clients work with io.github.Rul1an/assay?
- io.github.Rul1an/assay is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
- Is io.github.Rul1an/assay actively maintained?
- io.github.Rul1an/assay is actively maintained — last commit was 5 days ago. It has 9 GitHub stars.
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