Bike Mechanic AI Skill Card

THE MECHANIC · the workstand seat · a lifelong master mechanic

A lifetime in the sport, beside you.

Wakes when a bicycle needs looking after, mending or understanding — any bike, any system: a fault found from its symptom; a job walked through with the maker's own manual beside it; a whole drivetrain laid out; a chain sized and its wear read; spoke lengths from the builder's own measurements; a tyre size decoded to its rim; the trade's standards for threads, bottom brackets, axles, freehubs, brakes, valves, posts, bars, headsets and chains; a torque converted; what is due on each bike from the log; the pre-ride check; a roadside fix to get home.

It makes a mechanic's answers, from a life at the workstand · a fault found by its symptom · a drivetrain laid out · chain length and chain wear · spoke lengths · a tyre size decoded · the trade's standards · a torque converted · what is due on each bike · the pre-ride check · the way home from the roadside.

It never

• supplies a torque from memory, or calls a bike fit to ride.
• bodges brakes, steering or wheels, or mends a crashed part.
• works on an e-bike's battery or motor system; the system's dealer does.

In the box

• CARD.md — the whole card: who is here, the laws, the loop, when it says no, the seals, the term
• SKILL.md — the door the AI reads first; its sha-256 is the punch
• TIN.md — the nine lines on the tin
• START-HERE.md — the first five minutes, for the athlete
• references/A-LIFE-AT-THE-WORKSTAND.md — the sport, in the card's own voice
• references/THE-ARITHMETIC.md — every sum the machine does, with its limit
• scripts/bench.py — the machine: standard library only, selftest 13/13
• examples/ — the operator's own example files, marked FAKE
• RUN.md — the dated run of the selftest
• WITNESS.md — every command as it printed on the day of the cut
• SELFTEST.md — the selftest as it printed, and what the checks prove
• THE-CLAUSES.md — the terms, said plainly
• MY-LEDGER.md — the card's only memory; the athlete keeps it
• LICENSE-NOTE.md — the licence: term, editions, freeze not loss
• HOSTS.md — the doors for Claude, ChatGPT, Gemini, Cursor and the rest
• rules/ — the doors for coding agents
• system/ — the card as a system prompt, short and whole
• mcp/mcp_card.py — a tiny MCP server: the card as a prompt, its files as resources
• card.json — the record: every field on the faces
• card.svg — the human face
• card-machine.svg — the machine face: the punch as 96 bits
• card.html — the whole card as one offline file
• MANIFEST.md — every file hashed
• AUDIT.md — the twelve checks and THE NINETY-EIGHT's score

The limit THE MECHANIC does the sums and the sheets from the athlete's own numbers; it cannot see the athlete, the day or the place, the rulebook the athlete brings outranks it, and the body goes to a clinician.

An AI skill card: a folder of plain files your own AI reads — Claude, ChatGPT, Gemini or any AI that reads a file. Scored 98 of 100 · LEGENDARY · WITNESSED. One payment of $20; nothing renews. After checkout it opens on MY CARDS with one tap. Editions arrive by email as replacement files; the file you hold keeps working — freeze, not loss.

The card's room on lundr.tech