Preflight vs Skill Cortex Server
A side-by-side look at the Preflight and Skill Cortex Server MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Preflight for coding agents work as a local process; choose Skill Cortex Server for coding agents as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Preflight when
- You need dedicated capabilities in the Coding Agents domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: No auth required.
- You want tools like
preflight_check, scope_work, clarify_intent.
Choose Skill Cortex Server when
- You need dedicated capabilities in the Coding Agents domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: No auth required.
- You have the keys it needs:
SKILL_CORTEX_ROOTS, SKILL_CORTEX_CACHE_PATH, SKILL_CORTEX_TAGS_PATH. - You want tools like
path, query, tags.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Coding Agents | Coding Agents |
| Quality signal | 56/100 · Good | 52/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | No auth required | No auth required |
| Pricing | Free | Free |
| Required env vars | None listed | SKILL_CORTEX_ROOTSSKILL_CORTEX_CACHE_PATHSKILL_CORTEX_TAGS_PATH |
| Verified owner | Community listing | Community listing |
| GitHub stars | 13 | 24 |
| Directory activity | 5 views 0 installs 0 upvotes | 3 views 0 installs 0 upvotes |
| Tools | 24 | 16 |
| Full listing | View Preflight | View Skill Cortex Server |
Tools & capabilities
Preflight tools 24
preflight_checkThe main entry point.** Triages your prompt (trivial → multi-step), chains the right checks automatically, matches against known correction patterns. Accepts `force_level` override: `skip`, `light`, `full`.scope_workCreates structured execution plans before coding startsclarify_intentGathers project context (git state, workspace docs, ambiguity signals) to disambiguate vague promptsenrich_agent_taskEnriches sub-agent tasks with file paths, patterns, and cross-service contextsharpen_followupResolves "fix it" / "do the others" to actual file targetstoken_auditDetects waste patterns, grades your session A–Fsequence_tasksOrders tasks by dependency, locality, and riskcheckpointSave game before compaction — commits + resumption notescheck_session_healthMonitors uncommitted files, time since commit, turn countlog_correctionTracks corrections and identifies recurring error patternscheck_patternsChecks prompts against learned correction patterns — warns about known pitfallssession_handoffGenerates handoff briefs for new sessions- +12 more on the listing page
Skill Cortex Server tools 16
pathquerytagsskill_idsectionmax_linesmodeupdatesdescriptioninstructionslicensemetadata- +4 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.
Preflight
{
"mcpServers": {
"preflight-dev-preflight": {
"command": "npx",
"args": [
"-y",
"preflight-dev-serve"
]
}
}
}
Skill Cortex Server
{
"mcpServers": {
"sim-xia-skill-cortex-server": {
"command": "uvx",
"args": [
"skill-cortex-lite"
],
"env": {
"SKILL_CORTEX_ROOTS": "YOUR_SKILL_CORTEX_ROOTS_HERE",
"SKILL_CORTEX_CACHE_PATH": "YOUR_SKILL_CORTEX_CACHE_PATH_HERE",
"SKILL_CORTEX_TAGS_PATH": "YOUR_SKILL_CORTEX_TAGS_PATH_HERE"
}
}
}
}
Frequently asked questions
Preflight is categorized under Coding Agents and uses a local stdio subprocess. Skill Cortex Server belongs to Coding Agents and uses a local stdio subprocess. Pick Preflight for coding agents work and Skill Cortex Server for coding agents.
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.
Preflight is listed as free. Auth: no auth required. Skill Cortex Server 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 preflight-dev-preflight and sim-xia-skill-cortex-server as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Preflight has a quality signal of 56/100 (Good) with 5 views, 0 installs and 13 GitHub stars. Skill Cortex Server has 52/100 (Good) with 3 views, 0 installs and 24 GitHub stars.