| FMRS | 57 / 100 · C | 79 / 100 · B |
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| Reliability | 9 / 20 | 12 / 20 |
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| Security and permissions | 8 / 20 | 16 / 20 |
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| Maintenance | 14 / 20 | 18 / 20 |
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| Documentation | 14 / 20 | 18 / 20 |
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| Setup experience | 12 / 20 | 15 / 20 |
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| Best for | - Coding agents that need IDE-level code understanding
- Large or complex multi-file projects
- Developers using MCP-enabled terminal clients, desktop clients, or IDEs
| - Developers auditing NPM dependencies within AI workflows
- Teams performing supply chain security assessments
- Users of Claude Desktop, Cursor, or VS Code
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| Not for | - Non-coding tasks
- Small tasks requiring only simple text edits
- Environments unwilling to grant project editing or shell-command capabilities
| - Projects outside the NPM ecosystem (e.g., pure Python/Go)
- Environments without network access to deps.dev, OSV.dev, and the npm registry
- Scenarios requiring maintenance by an official upstream vendor
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| Required permissions | - It needs access to project files for code retrieval and editing.
- When basic tools are enabled, execute_shell_command can run shell commands such as builds, tests, and linters.
- The language-server backend may require additional dependencies for particular programming languages.
- The JetBrains backend requires the Serena JetBrains Plugin, which is paid and has a free trial.
| - Network access to the NPM registry and external services (deps.dev, OSV.dev, OpenSSF, npms.io, GitHub)
- Read access to workspace lockfiles (pnpm-lock.yaml, package-lock., yarn.lock) for cache invalidation
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| Risks and side effects | - Symbolic edits, refactorings, and text replacements can modify or delete code.
- When shell tools are enabled, the agent can run builds, tests, linters, or other commands.
- Language-server support and capabilities vary by language.
- The JetBrains backend does not support Rider or CLion.
| - Third-party READMEs and changelogs are untrusted external content; they are wrapped in tags with _meta flags but should still be handled cautiously
- Depends on availability and accuracy of external services
- Batch requests are capped at 25 packages to prevent registry enumeration; larger sets require batching
- Third-party open source project, not officially maintained by NPM or Anthropic
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| Supported clients | Claude Code, Codex, OpenCode, Gemini CLI, VS Code, Cursor, Claude Desktop, Open WebUI, JetBrains IDEs | Claude Desktop, VS Code, Cursor |
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| Tools | 6 | 19 |
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