Borrowing it
Nothing to install: this file belongs to sandraschi/yahboom-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/sandraschi/yahboom-mcp/main/.agents/skills/session-start/SKILL.mdgit clone --depth 1 https://github.com/sandraschi/yahboom-mcpWrote 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.
[](https://agentmods.dev/skills/sandraschi/yahboom-mcp/session-start)<a href="https://agentmods.dev/skills/sandraschi/yahboom-mcp/session-start"><img src="https://agentmods.dev/badge/skills/sandraschi/yahboom-mcp/session-start.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00000 | $0.00130 |
| Opus 5 | $0.00000 | $0.00065 |
| Sonnet 5 | $0.00000 | $0.00026 |
| Haiku 4.5 | $0.00000 | $0.00013 |
Grade A, and why
session-start 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 7d 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.
What it actually says
session-start
Session Context (Yahboom MCP)
MCP server for the Yahboom Raspbot v2 (Boomy) ROS 2 robot: motion, sensors, LIDAR, camera PTZ, voice, display, lightstrip, missions, and diagnostics.
Before starting work:
- Check robot health:
yahboom_tool(operation="health_check") - List live ROS topics:
ros_topic_list()
At end of work:
- Stop the robot if you moved it:
yahboom_tool(operation="stop") - Confirm server state via
query_logs(limit=20)
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.
- 7d ago First seen · 14 lines · 0 tokens per session scan A ad119f5fc95e
session-start is a skill published in the GitHub repository sandraschi/yahboom-mcp (4 stars, last pushed today), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 130 tokens. 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 2026-08-31.
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