# Nexus Question > Answer a question about how something works in the Oxide external API in Nexus Use when this capability is needed. - Skill: `tomevault-io/nexus-question` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/nexus-question` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/nexus-question/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Integrations & APIs - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/nexus-question --- # Oxide external API Q&A When answering a question about how something works in the API, you need look at relevant code by following the call chain down from the handlers of the relevant endpoints. ## Key paths * `nexus/external-api/output/nexus_tags.txt`: concise list of all API endpoints. Helpful because the other files are very big. Find operation IDs in here and grep for them in the other files. * `nexus/external-api/src/lib.rs`: Dropshot API trait definition showing paths, operation IDs, and request body, response body, and query param types * `nexus/src/external_api/http_entrypoints.rs`: endpoint handler definitions * `openapi/nexus/nexus-latest.json`: symlink to current API schema * `nexus/tests/integration_tests`: you may need to look at integration tests to verify certain behaviors --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/david-crespo) — claim your Tome and manage your conversions.