Vexor vs Ontomics
A side-by-side look at the Vexor and Ontomics MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Vexor for developer tools work as a local process; choose Ontomics for developer tools as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Vexor when
- You need dedicated capabilities in the Developer Tools domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: API key required.
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.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Developer Tools | Developer Tools |
| Quality signal | 59/100 · Good | 60/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | API key required | No auth required |
| Pricing | BYOK (pay the provider) | Free |
| Required env vars | None listed | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 245 | 43 |
| Directory activity | 2 views 0 installs 0 upvotes | 4 views 0 installs 0 upvotes |
| Tools | Not listed | 19 |
| Full listing | View Vexor | View Ontomics |
Tools & capabilities
Vexor tools
No tool names declared yet. Check the project README from the listing page.
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
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.
Vexor
{
"mcpServers": {
"scarletkc-vexor": {
"command": "uvx",
"args": [
"vexor"
]
}
}
}
Ontomics
{
"mcpServers": {
"etiennechollet-ontomics": {
"command": "npx",
"args": [
"-y",
"@ontomics/ontomics"
]
}
}
}
Frequently asked questions
Vexor is categorized under Developer Tools and uses a local stdio subprocess. Ontomics belongs to Developer Tools and uses a local stdio subprocess. Pick Vexor for developer tools work and Ontomics 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.
Vexor is bring-your-own-key: usage is billed by the API provider you supply a key for. Auth: api key required. Ontomics 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 scarletkc-vexor and etiennechollet-ontomics as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Vexor has a quality signal of 59/100 (Good) with 2 views, 0 installs and 245 GitHub stars. Ontomics has 60/100 (Good) with 4 views, 0 installs and 43 GitHub stars.