What is j6-ucp-perfetto-trace-catcher?

A tool for capturing Perfetto performance traces from a J6 development board running Horizon Robotics' UCP inference software. It transfers setup files to the board and retrieves the resulting .pftrace file.

Use it to capture UCP or Perfetto traces, debug scheduling with trace data, and collect trace files from a remote J6 board.

It removes the manual steps of preparing the board, running the trace, and copying the trace back to an X86 computer. The trace helps investigate scheduling and inference performance issues.

j6-ucp-perfetto-trace-catcher — Skill by HorizonRobotics/OE-Skills

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add HorizonRobotics/OE-Skills --skill j6-ucp-perfetto-trace-catcher

Clone the repo

git clone --depth 1 https://github.com/HorizonRobotics/OE-Skills

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/horizonrobotics/oe-skills/j6-ucp-perfetto-trace-catcher/github.svg)](https://agentmods.dev/skills/horizonrobotics/oe-skills/j6-ucp-perfetto-trace-catcher)

Your own site

<a href="https://agentmods.dev/skills/horizonrobotics/oe-skills/j6-ucp-perfetto-trace-catcher"><img src="https://agentmods.dev/badge/skills/horizonrobotics/oe-skills/j6-ucp-perfetto-trace-catcher/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/horizonrobotics/oe-skills/j6-ucp-perfetto-trace-catcher"><img src="https://agentmods.dev/badge/skills/horizonrobotics/oe-skills/j6-ucp-perfetto-trace-catcher.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 120 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,515 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.

Model	Per session	Once invoked
Fable 5.1	$0.00120	$0.02515
Opus 5.5	$0.00048	$0.01006
Sonnet 5.5	$0.00024	$0.00503
Haiku 4.5	$0.00012	$0.00251

Measured 2mo ago against content hash 991a1aad09c8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

j6-ucp-perfetto-trace-catcher 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 2mo 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.

horizon/skills/ucp/j6-ucp-perfetto-trace-catcher/SKILL.md · 195 lines

How it starts

The opening of the file, as written. The whole thing — 195 lines — stays where its author put it; the contents beside it link to each section on GitHub.

UCP Trace Catcher

Capture Perfetto-based UCP traces from a remote J6 development board and bring them back to the X86 host for analysis.

What this skill does

Automates the full lifecycle of UCP Perfetto trace capture:

Transfer config files to the dev board
Set up the trace environment and run the application
Pull the captured trace back to the host
Tell the user what to do next

Only Perfetto trace is in scope — ignore DSP trace and Chrome trace.

Never modify original files in this skill's directory. Copy config files to a temp location under the local current workspace (pwd), edit the copy there, then transfer.

Before starting

You need the following information from the user. Ask for anything not provided:

Parameter	Description	Example
`board_ip`	IP address or hostname of the dev board	`192.168.1.100`
`board_user`	SSH username for the board (default: `root` if not specified, do not use local username)	`root`
`work_dir`	Directory on the board where the UCP app runs	`/userdata/ucp_test`
`mode`	`in_process` or `system`	`system`
`enable_bpu`	Whether to capture BPU trace (system mode only, default: `false`)	`false`
`output_name`	Desired trace filename (default: `ucp.pftrace`)	`my_trace.pftrace`
`app_command`	The UCP application command to run	`./hrt_model_exec perf --model_file model.hbm --frame_count 1000 --thread_num 8`

If mode is not specified, ask the user:

in_process: captures only UCP process-internal trace (track_event). Does NOT support thread scheduling states, ftrace, memory stats, process stats, or BPU trace. No daemon needed. Good for UCP scheduling logic analysis.
system: captures UCP trace + thread scheduling states (ftrace), memory stats, and process stats by default (uses ucp_system.cfg). When BPU trace is enabled, the same ucp_system.cfg is used but BPU trace is additionally turned on via sysfs commands; BPU trace data will appear alongside ftrace data. Needs tracebox daemons. Use system mode when you need system-level visibility beyond UCP internals.

Read the full file on GitHub · 195 lines

Files

What ships with it

6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

2mo ago First seen · 195 lines · 120 tokens per session scan A 991a1aad09c8

Subscribe to this mod's changes

j6-ucp-perfetto-trace-catcher is a skill published in the GitHub repository HorizonRobotics/OE-Skills (27 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 120 tokens to every session and 2,515 once invoked, about $0.0005 per session on Opus 5.5. 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 2026-08-30.

Analytics and metrics Hardware and IoT

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