Arc Free Skills

io.github.ArcHelpsPublished by GitHub account ArcHelpsv1.0.0Updated Oct 24, 2026

100 systems and hardware engineering skills for requirements, interfaces, budgets and verification.

VerifiedSTDIODesktop onlyFiles & Storage Developer Tools

Server details

Identifier: io.github.ArcHelps/arc-free-skills
Transport: STDIO
Runtime: Desktop only
Trust: Verified
Published: Oct 17, 2026

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Overview

AI-generated overview

A local MCP server offering 100 systems and hardware engineering skills for requirements, interfaces, budgets, verification and reviews.

What you can do: Clean, extract, derive, compare and review requirements, including against ECSS editions and tender clauses, with page references and open questions kept visible. Review electrical and mechanical interfaces for missing or inconsistent parameters and drawing details. Build power and mass budgets by operating mode, with margins and unresolved loads flagged. Assess verification matrices, test results, environmental qualification coverage, FMEA omissions and DO-254 assurance evidence. Produce change registers when comparing specification versions.
When to use it: Useful for systems and hardware engineers who work with requirement spreadsheets, specification PDFs, interface drawings, budgets or verification evidence and want structured, source-preserving review drafts. Best suited to local MCP clients such as Codex or Claude Desktop rather than web-only chat.
Requirements: Runs locally over stdio via uvx from the arc-free-skills PyPI package; needs Python 3.11+ and uv. The environment variable ARC_FREE_SKILLS_WORKSPACE must point to an existing dedicated folder for inputs and new outputs, not the home directory. No model API key is needed. Desktop only.

Before you install

Files in the workspace are processed locally, but content used in the conversation still goes to your AI provider, and ChatGPT uploads follow its own policies. Standards such as ECSS are not bundled, so you must supply authorized copies. Engineering edits are proposals for review, not approved changes. Your assistant may have its own charges.

Installation

In SourceWeft

Open Arc Free Skills in the dashboard and add it to a workspace.
Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

🛠️ Systems Engineering Skills

100 free AI skills for systems and hardware engineers.

Review requirements against ECSS. Check electrical and mechanical interfaces. Build power and mass budgets. Review environmental qualification tests, FMEA and verification evidence.

Browse all 100 skills → · Setup · Example prompts

🍽️ Pick a task

What you have	Skill	What you get
A messy requirements spreadsheet	Clean and map requirements	A cleaned table, field mapping, import proposal and issues
A customer specification PDF	Extract customer requirements	A requirement register with IDs, page references and open questions
A requirement + the applicable ECSS edition	Review a requirement against ECSS	Findings tied to inspected criteria, with proposed corrections
A parent requirement	Derive sub-requirements	Proposed children, derivation rationale and unresolved decisions
Parent and child requirements	Compare children to parents	Gaps, unsupported additions and a coverage table
A requirements specification	Find conflicting requirements	Conflicting pairs, shared conditions and proposed resolutions
Requirements awaiting verification	Build a verification matrix	Requirement-to-method mapping and missing acceptance criteria
Test results + acceptance criteria	Assess test results	Evidence assessment, limitations and unresolved outcomes
A tender + your response evidence	Build a tender compliance matrix	Clause-by-clause responses, evidence and exceptions
Two versions of a specification	Compare specification versions	A change register and candidate verification impacts
An electrical interface specification	Review an electrical interface	Missing or inconsistent voltage, current, signal, grounding and fault parameters
Mechanical interface drawings	Review a mechanical interface	Mating geometry, datum, tolerance, clearance and load checks; unresolved drawing details
Component loads and supply limits	Build a system power budget	Power demand by operating mode, remaining margin and unresolved loads
Component masses and quantities	Build a system mass budget	Component totals, subsystem rollups, remaining allowance and missing estimates
Environmental requirements and test reports	Review environmental qualification coverage	Required conditions mapped to test evidence, with uncovered conditions identified
An FMEA	Review an FMEA for missing failure modes	Candidate omissions, failure consequences and questions requiring engineering judgment
Airborne electronic hardware assurance records + applicable objectives	Check DO-254 assurance evidence	Evidence gaps against supplied, applicable objectives

There are also skills for interfaces, architecture, budgets, safety, reliability, change control and design reviews. See the full menu →

🚀 Get started

Download this repo using Code → Download ZIP. Open the unzipped folder in Codex, or attach the ZIP to a ChatGPT conversation that supports file analysis.

Copy and paste this setup prompt:

text

Set up Arc Skills from:https://github.com/ArcHelps/systems-engineering-skillsUse the repository or ZIP I provided, or fetch the public repository if your tools allow it.Read README.md and docs/SETUP.md, then choose the route this client supports.If you can run local commands, install the locked dependencies, connect the localMCP to Codex using the documented configuration, and check skill discovery.Use a dedicated arc-engineering-work folder for inputs and new outputs.Keep my existing settings and source files intact. Do not publish or upload my files.If you cannot run a local MCP, read the attached catalogue and load only theselected skill and its references for this conversation. Explain any unavailable tools.Show me five relevant skills and run the synthetic requirements example if possible.Say which route actually worked and whether I need to restart or enable anything.

Set up Arc Skills from:https://github.com/ArcHelps/systems-engineering-skillsUse the repository or ZIP I provided, or fetch the public repository if your tools allow it.Read README.md and docs/SETUP.md, then choose the route this client supports.If you can run local commands, install the locked dependencies, connect the localMCP to Codex using the documented configuration, and check skill discovery.Use a dedicated arc-engineering-work folder for inputs and new outputs.Keep my existing settings and source files intact. Do not publish or upload my files.If you cannot run a local MCP, read the attached catalogue and load only theselected skill and its references for this conversation. Explain any unavailable tools.Show me five relevant skills and run the synthetic requirements example if possible.Say which route actually worked and whether I need to restart or enable anything.

Where you use it	What works
Codex on your computer	Local MCP with all 100 skills and file tools. Recommended.
ChatGPT web	Attached skill instructions + ChatGPT's available file tools. This does not install the MCP.
Claude Desktop / other local MCP clients	The same local MCP; connection instructions.

Local setup needs Python 3.11+ and uv. No model API key needed.

💬 Try it

Attach a file or place it in your configured work folder, then paste a prompt:

Clean requirements

text

Use Arc Skills to clean and map customer-requirements.xlsx.Preserve every source ID and original statement. Show the field mapping,duplicate IDs, TBDs/TBCs, missing information and unresolved links.Give me a cleaned workbook and an import proposal. Reconcile all row counts.

Use Arc Skills to clean and map customer-requirements.xlsx.Preserve every source ID and original statement. Show the field mapping,duplicate IDs, TBDs/TBCs, missing information and unresolved links.Give me a cleaned workbook and an import proposal. Reconcile all row counts.

Review a specification

text

Use Arc Skills to extract and review this requirements PDF.Keep page references, notes, figures and deleted requirements visible.Give me a requirements table and the most consequential issues first:contradictions, broken references, unclear limits and unverifiable statements.Separate confirmed problems from ambiguities. Don't invent missing values.

Use Arc Skills to extract and review this requirements PDF.Keep page references, notes, figures and deleted requirements visible.Give me a requirements table and the most consequential issues first:contradictions, broken references, unclear limits and unverifiable statements.Separate confirmed problems from ambiguities. Don't invent missing values.

Review against ECSS

text

Use Arc Skills to review REQ-014 against the ECSS-E-ST-10-06 editionI attached. Cite the inspected criteria, explain each finding and proposethe smallest correction. Preserve the original wording beside the proposal.If you cannot inspect the applicable standard, label the review advisory.

Use Arc Skills to review REQ-014 against the ECSS-E-ST-10-06 editionI attached. Cite the inspected criteria, explain each finding and proposethe smallest correction. Preserve the original wording beside the proposal.If you cannot inspect the applicable standard, label the review advisory.

Build a power budget

text

Use Arc Skills to build a system power budget from component-loads.xlsx.Separate standby, nominal and peak demand by operating mode. Preserve units,quantities, duty cycles and source values. Show demand against the suppliedpower limits, conversion losses, missing loads and remaining margin.Don't assume every peak load operates simultaneously or invent missing values.

Use Arc Skills to build a system power budget from component-loads.xlsx.Separate standby, nominal and peak demand by operating mode. Preserve units,quantities, duty cycles and source values. Show demand against the suppliedpower limits, conversion losses, missing loads and remaining margin.Don't assume every peak load operates simultaneously or invent missing values.

No file yet?

text

Use Arc Skills to review this requirement:"The unit shall provide an appropriate warning quickly."Explain what is missing and propose clearer wording without inventing a latency.

Use Arc Skills to review this requirement:"The unit shall provide an appropriate warning quickly."Explain what is missing and propose clearer wording without inventing a latency.

🔒 Your files

The local MCP processes files in your chosen folder without uploading them to an external server. Your assistant and its AI provider still process the content used in the conversation. ChatGPT uploads follow ChatGPT's policies. Data flow →

The skills and code are free under the MIT license. Your AI assistant may have its own charges. Standards are not bundled; provide authorized copies when needed. Engineering edits are proposals for your review, with source wording preserved.

For contributors

Write a skill · Validation and limits · MCP tools

Source: README.md at commit 279b09e

Tools

SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

v1.0.0LatestOct 17, 2026

Score

50% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

Reached in the last 30 days25 pts
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Auth declared10 pts
Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.
Tools listed15 pts
Answer tools/list without a credential, or ship a package that starts in a sandbox without one.
DescriptionRequired15 pts
Logo10 pts
Documentation15 pts
License10 pts