My /loop ran for fourteen hours in a backpack. The agent shipped a PR before I got home. SHIM is real engineering.
— Operator, Series-B fintech
SENIOR VIBE ENGINEER
SHIM.
Sustained — Headless — Inference — Module
Your agent doesn't sleep. Now your laptop doesn't either.
HALL-EFFECT BYPASS
10.4mm gap
PASSIVE COOLING
0W TDP
WAKE LATENCY
0ms
MASS
2.1g
APERTURE 10.4mm
DUROMETER 95A
TOLERANCE ±0.1mm
MATERIAL TPU
Introducing SHIM
A 25-second demonstration of sustained inference.
Film: rev 002 · 25.0s · soundtrack on tap
§ 01 / The discontinuity
A class of failure that wasn't possible three years ago.
Long-running agentic workloads have outgrown the chassis they run on. The portable workstation, optimized for two decades of human-driven sessions, was never designed to host a runtime that thinks for hours.
Your agent has been thinking for forty-three minutes. The lid closes. The Hall-effect sensor triggers. The kernel suspends. Eleven thousand tokens of context — gone.
43m
Median agent run time
before context collapse
before context collapse
11,400
Tokens lost per unscheduled
lid-close event
lid-close event
94%
Of incidents occur during
operator transit
operator transit
§ 02 / The mechanism
Four-stage passive wakelock.
SHIM occupies the hinge aperture between lid and chassis, maintaining a static 10.4mm separation that holds the magnetic field strength beneath the Hall-effect sensor's activation threshold. No software. No power draw. No telemetry.
STEP 01
Engage
Apply SHIM along the hinge aperture, posterior of the lid pivot. Self-locating geometry — no alignment required.
STEP 02
Maintain
TPU substrate sustains a 10.4mm static gap under load. Designed for transit-grade compression cycles.
STEP 03
Bypass
Magnetic flux density at the sensor stays below the wake threshold. Clamshell condition is never registered.
STEP 04
Persist
Runtime continues. Subagents continue. /loop continues. Bag, train, plane, café — the session does not collapse.
§ 03 / Demonstration
From desk
From desk
to bag, uninterrupted.
A real session, observed in transit. The agent's context window is preserved across the operator's commute. No software intervention. No external power.
01RUNTIME — agent active, lid open
02ENGAGE — SHIM inserted at aperture
03TRANSIT — operator places unit in bag
04PERSIST — agent runtime continues
§ 04 / Specifications
Engineered to ±0.1mm.
Every SHIM unit is individually inspected against a tolerance band tighter than the pivot tolerance of the host hardware. The specifications below apply across the full compatibility matrix.
Operating Principle
Hall-effect bypass
Sustained Aperture
10.4mm
Manufacturing Tolerance
±0.1mm
Substrate
Thermoplastic Polyurethane (95A)
Mass
2.1g
Operating Temperature
−20°C → 80°C
Power Draw (TDP)
0W — passive
Wake-State Latency
0ms
Compression Cycles
10,000+ rated
Hot-Swappable
Yes
Failover Behavior
Graceful — lid closes normally without unit
Data Transmission
None*
Compatibility
MacBook 2016 — present
Certifications
SOC2-ready* · ISO 9001 · RoHS · REACH · CE
SKU
001-IO / Inference Orange
§ 05 / Colorways
Five finishes. One geometry.
Pigment is integrated into the substrate at compound stage. The unit is colored throughout — no surface coating, no degradation over time, no flaking.
INFERENCE ORANGE — SKU 001-IO
Inference Orange
SKU 001-IO — THE REFERENCE FINISH
SELECTED
Carbon
SKU 001-CB — FOR EXECUTIVE ENGAGEMENTS
SELECT
Aluminum
SKU 001-AL — MATCHES THE HOST CHASSIS
SELECT
Token Cyan
SKU 001-TC — HIGH-VISIBILITY VARIANT
SELECT
Latency Red
SKU 001-LR — FOR MISSION-CRITICAL OPERATIONS
SELECT
§ 06 / Compatibility
Universal across the Apple Silicon matrix.
The hinge aperture geometry has remained dimensionally consistent across all Apple Silicon generations. A single SHIM form factor covers the supported product matrix.
MacBook Air 13"
M1 · M2 · M3 · M4
Verified
MacBook Air 15"
M2 · M3 · M4
Verified
MacBook Pro 14"
M1 Pro/Max · M2 Pro/Max · M3 Pro/Max · M4 Pro/Max
Verified
MacBook Pro 16"
M1 Pro/Max · M2 Pro/Max · M3 Pro/Max · M4 Pro/Max
Verified
MacBook Neo
All generations · operator-verified
Verified
MacBook Pro 13"
Intel · M1 · M2
Verified
MacBook 12" / earlier
Limited — contact support for engagement profile
Conditional
§ 07 / Field reports
Observed in production.
Selected accounts from operators running sustained agentic workloads on portable hardware.
Headless inference, but now actually headless. I haven't had to resume a Claude Code session in six weeks.
— Principal, Agent Operations
RUNTIME RELIABILITY
I no longer carry an open laptop through airport security. The TSA agents have stopped looking at me strangely. My partner is grateful.
— Founding Engineer, AI research lab
DISTRIBUTED SYSTEMS
Context preservation guaranteed. Bag → desk → bag, no resume, no compaction, no apology to my agent. This should ship in the box.
— VP Engineering, Stealth
PLATFORM
§ 08 / Pre-production enrollment
Reserve a unit.
Manufacturing allocation opens by serial. Enroll to receive a unit from the first production batch — $12 at ship, free worldwide.
Serial allocation by enrollment timestamp. Referrals advance you in the queue.
FREE WORLDWIDE SHIPPING · PADDED ENVELOPE · $12 AT SHIP
§ 09 / Frequent inquiries
Answered.
When does SHIM ship?
The first production batch is in tooling. Enrollees are allocated by enrollment timestamp and receive a serial number plus an estimated shipping window via email. Referrals advance position in the allocation queue.
Will SHIM scratch my MacBook?
No. The TPU substrate (95A durometer) is significantly softer than anodized aluminum. The contact surface has been profiled for zero-trace engagement, including at the lid coating interface. Long-term residue: none observed across our internal compression cycle testing.
Does SHIM work with M4 hardware?
Yes. SHIM is forward-compatible. The Hall-effect sensor geometry and lid pivot tolerances have remained dimensionally consistent across all Apple Silicon generations. The current SKU is verified against M1, M2, M3, and M4 chassis.
Is this a joke?
No. SHIM is a precision-manufactured passive hardware module, produced to ±0.1mm tolerance and individually inspected before fulfillment. Each unit ships with a serialized inspection record.
Why is there only one size?
The hinge aperture is dimensionally standardized across the supported product matrix. A single form factor eliminates inventory complexity and fulfillment latency. We are aware of the constraint and have, after consideration, retained it.
What happens if I lose mine?
You acquire another one. They are $12 and ship in a padded envelope.
Could I just use caffeinate?
The caffeinate utility suppresses idle sleep at the software layer. It does not intervene against the Hall-effect sensor, which triggers a hardware-level suspend on lid closure independent of operating-system state. SHIM operates beneath that abstraction.