MCP Discovery CLI

MCP Discovery CLI tool built in Rust enabling developers to discover and inspect MCP server capabilities — connecting to any MCP server and listing its tools, resources, and prompts, validating server implementations, and providing a lightweight CLI for MCP server exploration and debugging.

Evaluated Mar 06, 2026 (0d ago) vcurrent

Homepage ↗ Repo ↗ Developer Tools mcp-discovery mcp-tools rust cli developer-tools inspection

⚙ Agent Friendliness

/ 100

Can an agent use this?

🔒 Security

/ 100

Is it safe for agents?

⚡ Reliability

/ 100

Does it work consistently?

Score Breakdown

⚙ Agent Friendliness

MCP Quality

Documentation

Error Messages

Auth Simplicity

Rate Limits

🔒 Security

TLS Enforcement

Auth Strength

Scope Granularity

Dep. Hygiene

Secret Handling

Local CLI. No credentials. No data exposure. Community Rust tool.

⚡ Reliability

Uptime/SLA

Version Stability

Breaking Changes

Error Recovery

Best When

An MCP developer or integrator needs to quickly inspect what tools any MCP server exposes — fast Rust binary with no runtime dependencies.

Avoid When

You need to actually use MCP server tools in an agent — use an MCP client library instead.

Use Cases

• Discovering what tools an MCP server exposes from developer exploration
• Inspecting MCP server tool schemas before building integrations
• Debugging MCP server implementations during development
• Validating MCP server responses against spec from QA workflows
• Auditing third-party MCP server capabilities from security review
• Quick CLI access to MCP server info from DevOps tooling

Not For

• Production MCP use by AI agents (discovery/inspection tool, not an MCP server itself)
• Non-technical users (CLI-based developer tool)
• Automated agent workflows (designed for developer use, not agent consumption)

Interface

REST API

GraphQL

gRPC

MCP Server

No ↗

SDK

Webhooks

Authentication

Methods: none

OAuth: No Scopes: No

CLI tool — no auth for discovery tool itself. Auth for target MCP server passed as CLI arguments if needed.

Pricing

Model: free

Free tier: Yes

Requires CC: No

Free open source Rust CLI tool from rust-mcp-stack org.

Agent Metadata

Pagination

none

Idempotent

Full

Retry Guidance

Not documented

Known Gotchas

⚠ This is a CLI discovery tool, not an MCP server — cannot be used as an agent tool directly
⚠ Rust binary must be compiled or installed via cargo
⚠ Community tool from rust-mcp-stack — newer project
⚠ Target MCP server must be running and accessible
⚠ Output format designed for human reading — may need parsing for programmatic use

Alternatives

mcp-probe tester-mcp-client

Full Evaluation Report

Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for MCP Discovery CLI.

$99

API endpoint ↗ Agent guide ↗ Report inaccuracy

Scores are editorial opinions as of 2026-03-06.