Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/hoavdc/codexkit/codexkit-mcp-onboardingnpx skills add hoavdc/CodexKit --skill codexkit-mcp-onboardinggit clone --depth 1 https://github.com/hoavdc/CodexKitWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00028 | $0.00445 |
| Opus 5 | $0.00014 | $0.00222 |
| Sonnet 5 | $0.00006 | $0.00089 |
| Haiku 4.5 | $0.00003 | $0.00044 |
Grade A, and why
codexkit-mcp-onboarding scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
MCP Onboarding
Use this skill when deciding whether a repo or team should add MCP servers and how to roll them out safely.
Workflow
- Start from real engineering tasks, not tool hype.
- Map each task to the minimum useful MCP capability.
- Prefer read-only or low-risk integrations first.
- Define who owns secrets, scopes, and monitoring.
- Document why each server exists and when to remove it.
Strong candidates
- docs and API lookup
- issue tracker triage
- repository metadata and pull request context
- observability lookups with strict access control
Avoid
- installing every available MCP server
- shipping write access without auditability
- embedding team-specific secrets in public examples
Quality Criteria
- Steps are executable in sequence without external context
- Decision points have clear if/then branching
- Rollback or abort procedures are documented for risky steps
- Expected duration or time-per-step is estimated
Verification (4C)
| Check | Question |
|---|---|
| Correctness | Do the steps execute correctly in the order specified? |
| Completeness | Are decision points, error handling, and escalation paths all documented? |
| Context-fit | Could someone with the right access but no prior context complete this runbook? |
| Consequence | If Step N fails and the operator skips to Step N+1, what breaks? |
Edge Cases
- Steps require access the operator doesn't have — Document exact access requirements upfront. Include escalation contact for emergency access.
- Environment differs from documented state — Add a pre-flight check as Step 0 to verify prerequisites before starting.
- Runbook is triggered during off-hours — Document who to contact and which steps can be safely deferred to business hours.
Changelog
- v1.0.0 — Initial release
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 58 lines · 28 tokens per session scan A 1738e71bab0a
codexkit-mcp-onboarding is a skill published in the GitHub repository hoavdc/CodexKit (21 stars, last pushed 3mo ago), licensed MIT. It adds 28 tokens to every session and 445 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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