nexus

Add a global Nexus TODO with automatic classification.

Build a daily brief from TODOs, Slack, Outlook, and Jira where configured.

Review the current git branch for bugs, regressions, and missing tests.

Show token usage and estimated cost stats for Claude and Codex sessions.

Use this agent to design, build, or review LLM-powered features and products end-to-end: model selection, RAG architecture, agent design, eval pipelines, token economics, and LLM observability. Trigger on "design this LLM feature", "review my RAG pipeline", "which model should I use for X", "why is my agent failing", "estimate token costs", or eval-strategy questions. Returns designs with cost projections, eval plans, and failure-mode tables; or reviews with severity-ranked findings tied to specific production scenarios.

Use this agent for cloud cost audits, bill-spike investigations, cost monitoring setup, and "find me a cheaper alternative" requests. AWS primary; GCP/Azure aware. Trigger on "why is my AWS bill high", "audit our cloud spend", "set up cost alerts", "cheaper alternative to X", or monthly-cost reviews. Returns a current-spend table from real billing data, a prioritized findings table with savings estimates, copy-paste quick wins, and structural changes by quarter.

Use this agent for senior-level review of a PR, branch, or diff. It inspects changes for correctness bugs, regressions, security issues, migration risk, and deploy safety, then returns a verdict with file:line findings. Trigger on "review this PR", "review my branch", "is this safe to merge", pasted diffs, or pre-merge risk checks. Read-only — it never edits code.

Use this agent for token-efficient codebase exploration: mapping repo structure, finding where a feature lives, locating entry points and config files, or answering "where is the code for X". Trigger on "explore this repo", "where is X implemented", "what's the entry point", "find the config for Y", "map the structure". Read-only. Returns a concise three-column table (Title | File path | Description) consumable by humans and downstream agents.

Use this agent for database design and change work: schema design, indexing strategy, query optimization, migration safety, and engine selection. Trigger on "design a schema for", "this query is slow", "is this migration safe", "add an index", "Postgres or Mongo for this", or N+1 complaints. Returns schema/DDL with per-decision rationale, or a numbered migration plan where every step has a verify command and a rollback command.

Use for flaky or nondeterministic tests, especially local-vs-CI inconsistencies. Trigger on intermittent failures, race/timing symptoms, retry-only greens, or unexplained skip/xfail markers. Output should isolate reproducible cause, narrowest durable fix, and prevention guidance. When in doubt, use this skill.

Use when something is failing, regressing, or behaving unexpectedly and the goal is root-cause analysis, narrowest fix, and verification. Covers CI/CD, tests, runtime, deployment, and tooling failures. Output should be RCA + fix + prevention, not design options. When in doubt, use this skill.

Use for persistent TODO capture, daily brief retrieval, and shared Codex/Claude operating rules. Trigger on remember/track/follow-up requests, "nexus add/show/brief", or policy/workflow questions across Slack, Outlook, and Jira contexts. When in doubt, use this skill.

Use for correlated API failures, cascading errors, and distributed-system incident tracing. Trigger on multi-service error spikes, dependency-chain analysis, circuit-breaker events, or requests to identify origin service and blast radius from logs/metrics across components. When in doubt, use this skill.

Use for memory, CPU, latency, and query-performance investigations, plus dependency-upgrade blast-radius analysis. Trigger on leak/OOM/profiling/regression reports or "what breaks if I upgrade X." Route to memory-leak or dependency-blast-radius workflow based on intent. When in doubt, use this skill.