tckit: Skill for Claude Code

.claude/skills/tc-read-project/SKILL.md

tc-read-project is a skill for Claude Code from georgeturneruk/tckit. It costs 144 tokens per session (1,577 once invoked), scanned A, original, MIT.

A guide for inspecting TwinCAT 3 PLC projects through TcKit, using tools that read the project's program blocks, variables, data types, and global lists from disk.

In plain words
What is it for?
It is for locating program components, viewing a function block's public interface, reading one method or property, and inspecting global variables or custom data types.
Why use it?
It helps developers find the exact project information they need without loading every part of a program or using tools meant for editing and deployment.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

This is georgeturneruk/tckit's own configuration. It tells Claude Code how to work on tckit 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 tckit configures →

Reuse

Borrowing it

Nothing to install: this file belongs to georgeturneruk/tckit. 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/georgeturneruk/tckit/main/.claude/skills/tc-read-project/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/georgeturneruk/tckit

Made for: Claude Code.

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 tc-read-project

README.md
[![agentmods](https://agentmods.dev/badge/skills/georgeturneruk/tckit/tc-read-project/github.svg)](https://agentmods.dev/skills/georgeturneruk/tckit/tc-read-project)
Your own site
<a href="https://agentmods.dev/skills/georgeturneruk/tckit/tc-read-project"><img src="https://agentmods.dev/badge/skills/georgeturneruk/tckit/tc-read-project/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 tc-read-project

Your own site · 80×15
<a href="https://agentmods.dev/skills/georgeturneruk/tckit/tc-read-project"><img src="https://agentmods.dev/badge/skills/georgeturneruk/tckit/tc-read-project.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 144 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,577 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 $0.00144 $0.01577
Opus 5 $0.00072 $0.00788
Sonnet 5 $0.00029 $0.00315
Haiku 4.5 $0.00014 $0.00158

Measured 9d ago against content hash 6a5e8e0d69aa, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

tc-read-project 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 9d 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.

.claude/skills/tc-read-project/SKILL.md · 76 lines

How it starts

The opening of the file, as written. The whole thing — 76 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Reading TwinCAT projects through TcKit

First-touch orientation belongs to tc-orient-project. This skill picks up once orientation is done and the user asks for something specific.

Always read in layers. Never fetch a full POU when one method suffices.

Tool selection — read this before calling anything

This skill uses only the TcKit reader tools and the stock Read/Grep/Glob. The reader tools are:

  • mcp__tckit__GetStructure — project map (POUs, GVLs, DUTs, tasks, libraries)
  • mcp__tckit__GetPouInterface — declarations and method signatures for one POU
  • mcp__tckit__GetPouItem — declaration + body for one method, action, or property accessor
  • mcp__tckit__GetGvl — one GVL's declaration
  • mcp__tckit__GetDut — one DUT's declaration (struct, enum, union, alias)

Reader tools read XML directly from disk. They do NOT need XAE or a live PLC. They work whenever the TcKit MCP server is reachable, even with no XAE open and no PLC connected.

Do NOT call writer or build tools from this skill. mcp__tckit__OpenProject, AddPou, Build, Deploy, RunTests, and similar are out of scope here. They need XAE open (or a live target) and have no bearing on reading. If you see one of those tools error because XAE or the target isn't reachable, that error tells you nothing about whether the reader tools work — keep using get_*.

Common request shapes and the one-call answer:

Request Tool
"What's the API / methods / signatures of FB_X?" GetPouInterface(X)
"Show me FB_X.Execute's implementation" GetPouItem(X, "Execute")
"What fields does ST_Config have?" GetDut("ST_Config")
"What's in GVL_Params?" GetGvl("GVL_Params")
"Where does FB_X live in the project?" check the earlier GetStructure payload

Read the full file on GitHub · 76 lines

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. 9d ago First seen · 76 lines · 144 tokens per session scan A 6a5e8e0d69aa

Subscribe to this mod's changes

tc-read-project is a skill published in the GitHub repository georgeturneruk/tckit (5 stars, last pushed 16d ago), licensed MIT. It adds 144 tokens to every session and 1,577 once invoked, about $0.0007 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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