Ontomics vs Vex
A side-by-side look at the Ontomics and Vex MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
V
VexDeveloper ToolsLocal code search for agents: symbols, usages, call graph, AST patterns, grep and semantic search39FairAuth: no auth requiredVerdict: choose Ontomics for developer tools work as a local process; choose Vex for developer tools. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Ontomics when
- You need dedicated capabilities in the Developer Tools domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: No auth required.
- You want tools like
query_concept, locate_concept, describe_symbol.
VChoose Vex when
- You need dedicated capabilities in the Developer Tools domain.
- Its auth model fits you: No auth required.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | V Vex | |
|---|---|---|
| Category | Developer Tools | Developer Tools |
| Quality signal | 56/100 · Good | 39/100 · Fair |
| Install command | Confirmed | Not confirmed yet |
| Transport | Local subprocess (stdio) | — |
| Auth | No auth required | No auth required |
| Pricing | Free | Free |
| Required env vars | None listed | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 43 | 12 |
| Directory activity | 4 views 0 installs 0 upvotes | 0 views 0 installs 0 upvotes |
| Tools | 19 | Not listed |
| Full listing | View Ontomics | View Vex |
Tools & capabilities
Ontomics tools 19
query_conceptFind all variants, related concepts, and occurrences of a termlocate_conceptFind the key signatures, classes, and files for a conceptdescribe_symbolGet the signature, docstring, and relationships for a function or classtrace_conceptTrace how a concept flows through the codebase via call chainslist_conceptsList the top domain concepts by frequencylist_conventionsList all detected naming patterns (prefixes, suffixes, conversions)list_entitiesList code entities (classes, functions) filtered by concept, role, or kindcheck_namingCheck an identifier against project conventions; suggests the canonical formsuggest_nameGenerate an identifier name that fits the project's vocabularyvocabulary_healthMeasure convention coverage, naming consistency, and cluster cohesionontology_diffShow new, changed, or removed domain concepts since a git refexport_domain_packExport domain knowledge as portable YAML for use in other repos- +7 more on the listing page
Vex tools
No tool names declared yet. Check the project README from the listing page.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Ontomics
{
"mcpServers": {
"etiennechollet-ontomics": {
"command": "npx",
"args": [
"-y",
"@ontomics/ontomics"
]
}
}
}
Vex
No confirmed install command for Vex yet — follow the setup steps linked from its listing page rather than a guessed package name.
Frequently asked questions
Ontomics is categorized under Developer Tools and uses a local stdio subprocess. Vex belongs to Developer Tools and uses an install path we have not confirmed yet. Pick Ontomics for developer tools work and Vex for developer tools.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client. Vex has no confirmed install command yet — follow its own setup instructions.
Ontomics is listed as free. Auth: no auth required. Vex is listed as free. Auth: no auth required. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add etiennechollet-ontomics and vex as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Ontomics has a quality signal of 56/100 (Good) with 4 views, 0 installs and 43 GitHub stars. Vex has 39/100 (Fair) with 0 views, 0 installs and 12 GitHub stars.