Borrowing it
Nothing to install: this file belongs to lewing/helix.mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/lewing/helix.mcp/main/.squad/skills/mcp-enum-with-aliases/SKILL.mdgit clone --depth 1 https://github.com/lewing/helix.mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/lewing/helix.mcp/mcp-enum-with-aliases)<a href="https://agentmods.dev/skills/lewing/helix.mcp/mcp-enum-with-aliases"><img src="https://agentmods.dev/badge/skills/lewing/helix.mcp/mcp-enum-with-aliases/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/lewing/helix.mcp/mcp-enum-with-aliases"><img src="https://agentmods.dev/badge/skills/lewing/helix.mcp/mcp-enum-with-aliases.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.00023 | $0.00318 |
| Opus 5 | $0.00012 | $0.00159 |
| Sonnet 5 | $0.00005 | $0.00064 |
| Haiku 4.5 | $0.00002 | $0.00032 |
Grade A, and why
mcp-enum-with-aliases 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 10d 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
Context
Use this when an MCP tool should expose a small, canonical enum in AllowedValues, but callers may realistically send adjacent platform spellings or natural-language synonyms.
Patterns
- Keep
AllowedValueslimited to the canonical names you want in the schema. - Normalize silent aliases before validation so confused callers succeed without bloating the public enum.
- Share canonical values, alias normalization, predicate logic, and invalid-value text from one helper so tool and service layers cannot drift.
- Keep error messages canonical-only: list the official values, not the hidden aliases.
- If a new preset expands selection beyond the legacy data-shape assumptions, preserve the existing contract first (for example, use an empty string sentinel instead of widening the model immediately).
Examples
- Accept
inProgress,in-progress, andactiveas silent aliases for canonicalrunning. - Accept
notStartedandnot-startedas silent aliases for canonicalpending. - Validate after normalization, then run one shared predicate helper across all call sites.
Anti-Patterns
- Listing both canonical values and aliases in
AllowedValues, forcing callers to choose between synonyms. - Duplicating switch logic in each MCP tool or service method.
- Returning alias names in error text, which makes the public contract look larger than it is.
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.
- 10d ago First seen · 28 lines · 23 tokens per session scan A 5881558133a7
mcp-enum-with-aliases is a skill published in the GitHub repository lewing/helix.mcp (4 stars, last pushed today), licensed MIT. It adds 23 tokens to every session and 318 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 2026-08-31.
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