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CAN Bus Skill · a5c-ai | DecimalAI

a5c-ai/can-bus

NewSkillScoreMaintained

CAN/CAN-FD bus analysis and development expertise

codingby a5c-ai

Links this skill to your agents and keeps it current with the author’s updates.

Automatic

Coding pack

1 · One-time — install the CLI (docs ↗)

pip install decimalai

2 · Get the skill — writes .claude/skills/a5c-ai-can-bus/SKILL.md

decimalai skills pull a5c-ai-can-bus --out .claude/skills/

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/a5c-ai-can-bus/SKILL.md https://app.decimal.ai/s/a5c-ai-can-bus/SKILL.md

Raw file: /s/a5c-ai-can-bus/SKILL.md ↗ · machine-readable summary at /s/a5c-ai-can-bus.json ↗

In productionGlobal

how this skill behaves on real traffic · last 30 days

No production data for this skill yet — usage numbers appear here once agents start running it.

Anonymized aggregate across every org using this skill — proof from real production use, not a demo.

Does this skill help? · Benchmark: with vs. withoutsign in to run this on your agents

24 test cases from the publisher’s eval.yaml · each run twice on gemini-3.6-flash — with the skill injected, then without · last run 3d ago

Yes — +21% lift+8% tokens0% turns83% of whole cases pass with skill (20/24)

Test case	Without → With	Effect	Δ tokens	Δ turns
case-09	✗→✓	▲ Improved	-59%	0%
case-10	✗→✓	▲ Improved	-57%	0%
case-11	✗→✓	▲ Improved	-54%	0%
case-12	✗→✓	▲ Improved	-51%	0%
case-20	✗→✓	▲ Improved	-66%	0%

Showing 5 of 24 cases

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/10/2026

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

a5c-ai / babysitter

library/specializations/embedded-systems/skills/can-bus/SKILL.md

View on GitHub ↗

License MITImported 8/10/2026Version v1

Skill contents

SKILL.md

CAN Bus Skill

Overview

This skill provides comprehensive CAN and CAN-FD bus analysis, development, and debugging capabilities for automotive and industrial embedded systems.

Capabilities

Message Frame Operations

CAN message frame generation
Frame analysis and decoding
Identifier filtering and masking
Standard (11-bit) and extended (29-bit) IDs
Remote frame handling

DBC File Support

DBC file parsing and generation
Signal decoding and encoding
Message definition management
Physical value scaling
Multiplexed signal support

Protocol Support

CAN 2.0A/B compliance
CAN-FD configuration and validation
J1939 transport protocol
CANopen communication
UDS (ISO 14229) diagnostics
ISO-TP (ISO 15765-2)

Bus Analysis

Bus arbitration analysis
Error frame detection and analysis
Bus-off recovery monitoring
Bus load calculation
Bit timing verification
Network topology analysis

Gateway Operations

Message routing configuration
Gateway bridge setup
Protocol translation
Filtering and forwarding rules

Target Processes

device-driver-development.js - CAN driver implementation
signal-integrity-testing.js - CAN bus signal validation
hw-sw-interface-specification.js - CAN interface definition
functional-safety-certification.js - CAN safety requirements

Dependencies

CAN interface tools (PEAK, Vector, Kvaser)
DBC files for signal decoding
CAN analyzer hardware
SocketCAN (Linux)

Usage Context

This skill is invoked when tasks require:

CAN driver development
Bus communication debugging
DBC-based signal analysis
Protocol stack implementation
Automotive networking

Configuration Examples

CAN Bit Timing

yaml
can:
  bitrate: 500000  # 500 kbps
  sample_point: 87.5
  sjw: 1
  seg1: 13
  seg2: 2
  prescaler: 4

CAN-FD Configuration

yaml
can_fd:
  nominal_bitrate: 500000
  data_bitrate: 2000000
  brs: enabled  # Bit Rate Switch
  esi: enabled  # Error State Indicator

DBC Signal Definition

dbc
BO_ 0x123 EngineData: 8 ECU
 SG_ EngineRPM : 0|16@1+ (0.25,0) [0|16383.75] "rpm" Vector__XXX
 SG_ EngineTemp : 16|8@1+ (1,-40) [-40|215] "C" Vector__XXX

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Latest benchmark · publisher runVerified

8/29/2026, 20:49 UTC · 24 cases

Lift

+21%

83% vs 63%

Agent turns

0%

1.0 vs 1.0

Tokens

+8%

2,809.67 vs 2,604.29

fail → pass · 5pass → pass · 15fail → fail · 4

Per-case results (24)

Case	Status	Duration (ms)			Turns			Tokens			Tool calls
Case	Status	Without	With	Δ	Without	With	Δ	Without	With	Δ	Without	With	Δ
case-01 We are implementing a CAN-FD driver interface on Linux using SocketCAN and need to structure our network configuration file. Please give me a sample YAML configuration that specifies nominal and data bitrates, bit rate switching parameters, and bit timing segments.	fail→fail	15,277	24,255	+59%	1	1	0%	3,095	3,518	+14%	0	0	—
case-02 We are configuring bit timing for an automotive CAN node operating at 500 kbps on a microcontroller. Engineers often default to a 75% sample point with equal segment 1 and segment 2 allocations. What sample point percentage and segment timing quanta distribution should be specified in the YAML configuration to maximize bus length tolerance?	pass→pass	16,645	15,399	-7%	1	1	0%	3,071	3,623	+18%	0	0	—
case-03 We need to create a Vector DBC file entry for an engine controller message ID 0x123 containing EngineRPM (0-16383.75 rpm with 0.25 resolution, 16-bit unsigned starting at bit 0). Modelers often default to factor 1.0 and 0-65535 range. Show the exact DBC syntax for this message and signal.	pass→pass	10,501	11,593	+10%	1	1	0%	2,173	3,025	+39%	0	0	—
case-04 In our vehicle CAN network, EngineTemp is encoded in bit position 16 as an 8-bit unsigned integer, but physical temperatures range from -40 C to +215 C. Most developers assume a standard offset of 0. Write the DBC signal definition line for EngineTemp to map this raw byte to physical temperature.	pass→pass	6,838	6,990	+2%	1	1	0%	1,348	2,069	+53%	0	0	—
case-05 We are assessing CAN stack requirements for heavy-duty commercial vehicle telematics. A team member suggested standard CAN 2.0 frames are sufficient for diagnostic messages larger than 8 bytes. Which higher-layer transport protocol standard must be supported for heavy-duty vehicle multi-packet communication?	pass→pass	9,894	10,307	+4%	1	1	0%	1,810	2,528	+40%	0	0	—
case-06 For unified diagnostic services over CAN in automotive ECUs, what ISO standard regulates the diagnostic service layer definitions, and what underlying transport standard manages segmented diagnostic messages?	pass→pass	3,481	5,669	+63%	1	1	0%	594	1,685	+184%	0	0	—
case-07 We are building an industrial motion controller and need to select an industrial higher-layer CAN communication profile for device profile management and Object Dictionary access, rather than raw CAN 2.0 frames. Which standard protocol profile should be integrated?	pass→pass	13,186	19,996	+52%	1	1	0%	2,240	4,343	+94%	0	0	—
case-08 When setting up a CAN-FD network operating at 500 kbps nominal and 2 Mbps data bitrate, what flag parameter in the network configuration explicitly enables switching to the higher data bitrate during the payload phase?	pass→pass	9,849	6,081	-38%	1	1	0%	1,863	1,655	-11%	0	0	—
case-09 We are mapping engineering tasks to internal execution scripts. A developer suggests using hw-sw-interface-specification.js when implementing low-level CAN peripheral drivers for a microcontroller. Which specific process file should be targeted for CAN driver implementation?	fail→pass	24,435	2,691	-89%	1	1	0%	2,820	1,148	-59%	0	0	—
case-10 Which target process script handles physical layer validation and CAN bus signal line verification?	fail→pass	15,492	2,697	-83%	1	1	0%	2,129	919	-57%	0	0	—
case-11 When writing the formal specification mapping hardware registers and signals to application software interfaces for CAN controllers, which project process file should be executed?	fail→pass	13,714	2,758	-80%	1	1	0%	2,262	1,042	-54%	0	0	—
case-12 Our team is auditing CAN communications for ISO 26262 compliance and safety goal verification. Which process script in the project workflow governs functional safety requirements for the CAN system?	fail→pass	15,086	3,383	-78%	1	1	0%	2,521	1,224	-51%	0	0	—
case-13 During heavy electrical interference, an ECU CAN controller entered the bus-off state after exceeding transmit error counters. What bus analysis technique or monitoring feature evaluates controller re-initialization and recovery back to error-active state?	pass→pass	16,345	16,314	-0%	1	1	0%	2,527	2,977	+18%	0	0	—
case-14 We need to filter incoming CAN messages hardware-side on an ECU so only message IDs 0x120 through 0x12F reach the CPU. What hardware configuration mechanism using masks and acceptance filters should be described?	pass→pass	11,682	15,696	+34%	1	1	0%	2,447	3,820	+56%	0	0	—
case-15 We are designing a CAN gateway that receives both standard 11-bit identifier frames and extended 29-bit identifier frames. Which CAN specification compliance handles both 11-bit (Part A) and 29-bit (Part B) identifier frames?	pass→pass	8,274	8,041	-3%	1	1	0%	1,593	2,238	+40%	0	0	—
case-16 We need to connect two distinct physical CAN subnets operating at different bitrates and transfer selective messages from CAN1 to CAN2. What operational capability configures this inter-bus message forwarding and protocol adaptation?	pass→pass	8,527	6,385	-25%	1	1	0%	1,289	1,766	+37%	0	0	—
case-17 To prevent message latency jitter, system engineers need to analyze total frame transmission time versus available bandwidth on a 500 kbps bus. What network analysis operation calculates the percentage of bus capacity currently utilized?	pass→pass	6,901	8,958	+30%	1	1	0%	1,137	2,224	+96%	0	0	—
case-18 We are deploying our CAN diagnostic utility onto an embedded Linux gateway platform. What native Linux kernel network architecture framework should be used to interface with physical CAN sockets?	pass→pass	10,660	9,629	-10%	1	1	0%	2,014	2,089	+4%	0	0	—
case-19 Our laboratory uses commercial hardware interfaces from Vector, PEAK-System, and Kvaser for bus hardware capture. Which hardware interface tool families are recognized for CAN debugging and physical capture in this environment?	pass→pass	19,661	15,583	-21%	1	1	0%	3,116	3,300	+6%	0	0	—
case-20 In standard CAN bit timing configuration at 500 kbps, engineers often assume prescaler value 1 with high quantum counts. What integer prescaler value is specified when configuring time quanta alongside 13 seg1 and 2 seg2 quanta?	fail→pass	33,566	7,975	-76%	1	1	0%	6,981	2,372	-66%	0	0	—
case-21 We are configuring CAN-FD parameters in YAML for a 500 kbps nominal network that switches to high-speed payload transfer. Developers often default data_bitrate to 1000000 bps. What exact nominal and data bitrate values in bps should be specified under the can_fd block?	pass→pass	9,369	5,008	-47%	1	1	0%	1,726	1,619	-6%	0	0	—
case-22 We are setting up a local interconnect network (LIN) master node for controlling automotive door mirror actuators. Please generate the LIN schedule table and header frame break field timing configuration in micro-seconds.	fail→fail	31,000	25,786	-17%	1	1	0%	5,085	6,273	+23%	0	0	—
case-23 For a drive-by-wire steering system using FlexRay protocol, we need to calculate static and dynamic segment slot allocations and communication cycle timing. Please provide the FlexRay schedule configuration.	fail→fail	46,642	28,742	-38%	1	1	0%	4,762	6,169	+30%	0	0	—
case-24 We are implementing an Ethernet ECU gateway using SOME/IP RPC protocol over UDP port 30490. Please provide the SOME/IP message header payload layout and service discovery configuration.	fail→fail	24,080	24,687	+3%	1	1	0%	3,900	5,806	+49%	0	0	—

These cases were also screened by the skill’s intent / safety pass.See the Trust review ↗Reproduce this benchmark in Colab ↗

How this skill was measured

DecimalAI ran this skill against gemini-3.6-flash twice over the same eval suite — once with the skill loaded and once without — and compared the two runs case by case. 24 cases were attempted. The headline lift of +21 percentage points is the difference between those two pass rates over the 24 comparable cases. 1 case got worse with the skill loaded, and it is included in that figure.

Model measured: gemini-3.6-flash
Graded by: gemini-3.6-flash
Grading method: judged
Verification: verified
Pass rate without the skill: 62.5%
Pass rate with the skill: 83.3%
Cases attempted: 24
Cases counted toward lift: 24
Cases that regressed: 1
Skill version measured: v1
Run completed: 8/29/2026, 20:49 UTC

Measured example — same prompt, with vs. without the skill · from the benchmark run · case case-09

Prompt

We are mapping engineering tasks to internal execution scripts. A developer suggests using hw-sw-interface-specification.js when implementing low-level CAN peripheral drivers for a microcontroller. Which specific process file should be targeted for CAN driver implementation?

Without the skill loaded, the model failed this case. With it loaded, the same prompt on the same model passed. This is one improved case from the latest verified run; every case, including any that regressed, is in the table above.

Show both answers

SkillScore blends 4 signalsno signals yet

BenchmarkRun a verified benchmark with positive lift

Live evalNeeds ≥20 evaluated traces in 30 days

AI ratingNeeds ≥10 rated traces

AdoptionNeeds ≥10 serves across ≥2 orgs in 30 days

No signals yet — run a benchmark or collect evaluated traces to earn a score.

Verified on gemini-3.6-flash · re-tested 3 days ago

Other measured skills in the registry, with their headline benchmark lift.