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xcodeinstrumentmcp: Skill for Codex

.codex/skills/mcp/SKILL.md

mcp is a skill for Codex from eksdev007/xcodeinstrumentmcp. It costs 64 tokens per session (283 once invoked), scanned A, original, MIT.

Guidance for exposing software functions to coding agents through MCP, a standard way for agents to call tools with defined inputs and outputs.

In plain words
What is it for?
Use it when designing or changing tool names, schemas, server wiring, contract tests, or documentation for an MCP interface.
Why use it?
It helps keep agent-facing tools focused, bounded, consistent, and compatible over time.

Skill for Codex

Written for Codex: installed under .codex/.

This is eksdev007/xcodeinstrumentmcp's own configuration. It tells Codex how to work on xcodeinstrumentmcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything xcodeinstrumentmcp configures →

not rated 2repo 6mo ago A scan 64 tokens original MIT
View source ↗ eksdev007/xcodeinstrumentmcp
Reuse

Borrowing it

Nothing to install: this file belongs to eksdev007/xcodeinstrumentmcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/eksdev007/xcodeinstrumentmcp/main/.codex/skills/mcp/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/eksdev007/xcodeinstrumentmcp

Made for: Codex.

Wrote 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.

agentmods badge for mcp

README.md
[![agentmods](https://agentmods.dev/badge/skills/eksdev007/xcodeinstrumentmcp/mcp/github.svg)](https://agentmods.dev/skills/eksdev007/xcodeinstrumentmcp/mcp)
Your own site
<a href="https://agentmods.dev/skills/eksdev007/xcodeinstrumentmcp/mcp"><img src="https://agentmods.dev/badge/skills/eksdev007/xcodeinstrumentmcp/mcp/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.

agentmods 80×15 button for mcp

Your own site · 80×15
<a href="https://agentmods.dev/skills/eksdev007/xcodeinstrumentmcp/mcp"><img src="https://agentmods.dev/badge/skills/eksdev007/xcodeinstrumentmcp/mcp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 64 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 283 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00064 $0.00283
Opus 5.5 $0.00026 $0.00113
Sonnet 5.5 $0.00013 $0.00057
Haiku 4.5 $0.00006 $0.00028

Measured 2mo ago against content hash 81d545b1d892, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcp 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 2mo 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.

.codex/skills/mcp/SKILL.md · 36 lines

What it actually says

MCP

Use this skill for the public MCP interface.

Goal

Expose high-value workflows that help agents answer the next engineering question without forcing them to consume raw trace plumbing.

Product rules

  • Expose workflows, not low-level exports.
  • Keep schemas explicit, bounded, and versionable.
  • Keep one tool focused on one job.
  • Reuse the same core services that power the CLI.
  • Favor stable machine-readable output over presentation-oriented text.

Workflow

  1. Check the spec for the exact tool contract and scope.
  2. Implement or update the shared core service first when possible.
  3. Map the MCP surface onto that service with narrow validation.
  4. Add or update MCP contract tests.
  5. Update docs/examples for every public surface change.

Guardrails

  • Do not expose raw parser internals as public API.
  • Do not return unbounded payloads.
  • Do not create separate MCP-only business logic if the same behavior belongs in core.
  • Keep backward-compatibility in mind once a tool is named in docs.
Changes

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.

  1. 2mo ago First seen · 36 lines · 64 tokens per session scan A 81d545b1d892

Subscribe to this mod's changes

mcp is a skill published in the GitHub repository eksdev007/xcodeinstrumentmcp (2 stars, last pushed 6mo ago), licensed MIT. It adds 64 tokens to every session and 283 once invoked, about $0.0003 per session on Opus 5.5. 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.

Backend and APIsBuilding agentsinstrumentsiosmcp-serverxcode
Related

mcp compared with skills from other repositories

mcp next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
mcpeksdev007/xcodeinstrumentmcpSkill26mo agoMITA64Codex
n8n-code-toolczlonkowski/n8n-mcpSkill23kyesterdayMITA221Claude Code, Codex
n8n-subworkflowsczlonkowski/n8n-mcpSkill23kyesterdayMITA121Claude Code, Codex
sanity-singletonssanity-io/agent-toolkitSkill19710d agoMITA90Claude Code
sanity-best-practicessanity-io/agent-toolkitSkill19710d agoMITA177Claude Code
tech-specsgriddynamics/rosettaSkill370yesterdayApache-2.0A23Claude Code
mcp-google-map-projectcablate/mcp-google-mapSkill48915d agoMITA49Claude Code