hotpath-rs is a Rust profiler that measures where programs spend time, use CPU and memory, wait on I/O, and perform database, HTTP, or asynchronous operations. Rust developers use it to locate performance bottlenecks and inspect timing, allocation, and async-flow data.
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.
npx skills add pawurb/hotpath-rs --skill syncmetagit clone --depth 1 https://github.com/pawurb/hotpath-rsWrote 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/pawurb/hotpath-rs/syncmeta)<a href="https://agentmods.dev/skills/pawurb/hotpath-rs/syncmeta"><img src="https://agentmods.dev/badge/skills/pawurb/hotpath-rs/syncmeta/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.
<a href="https://agentmods.dev/skills/pawurb/hotpath-rs/syncmeta"><img src="https://agentmods.dev/badge/skills/pawurb/hotpath-rs/syncmeta.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00055 | $0.01268 |
| Opus 5.5 | $0.00022 | $0.00507 |
| Sonnet 5.5 | $0.00011 | $0.00254 |
| Haiku 4.5 | $0.00006 | $0.00127 |
Grade A, and why
syncmeta 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Sync Meta Crates
Sync recent changes from hotpath → hotpath-meta, hotpath-macros → hotpath-macros-meta and hotpath-drain → hotpath-drain-meta.
The meta crates are copies of the main crates used to profile the profiler itself. They must stay in sync with the source crates.
Effective Approach
DO NOT copy entire files from hotpath to hotpath-meta and then sed-replace. This approach fails because the meta crates have many naming differences beyond simple hotpath:: → hotpath_meta:: substitution:
- Feature flags:
hotpath→hotpath-meta,hotpath-alloc→hotpath-alloc-meta,hotpath-cpu→hotpath-cpu-meta,hotpath-cloud→hotpath-cloud-meta,hotpath-prometheus→hotpath-prometheus-meta,hotpath-mcp→hotpath-mcp-meta - Crate imports:
hotpath_macros→hotpath_macros_meta,hotpath_drain→hotpath_drain_meta - Environment variables:
HOTPATH_FOCUS→HOTPATH_META_FOCUS,HOTPATH_EXCLUDE_WRAPPER→HOTPATH_META_EXCLUDE_WRAPPER,HOTPATH_OUTPUT_PATH→HOTPATH_META_OUTPUT_PATH - Self-instrumentation: lines like
#[cfg_attr(feature = "hotpath-meta", hotpath_meta::measure_all)]exist in hotpath but must NOT exist in hotpath-meta hotpath-drain-metais the simplest mirror: it has no features and no dependencies, so syncinghotpath-drainmeans applying the diff and dropping the#[cfg_attr(feature = "hotpath-meta", hotpath_meta::measure(...))]lines. Nothing else is renamed - there is nohotpath-drain-metafeature flag.
Instead, apply diffs to the existing meta files:
- Get the actual diff for each changed file:
git diff HEAD~N..HEAD -- crates/hotpath/src/path/to/file.rs - Read the corresponding meta file
- Apply the equivalent semantic changes, preserving all meta-specific naming
Steps
- Check the last N commits (default 1, user can specify more) for changes to
crates/hotpath/,crates/hotpath-macros/andcrates/hotpath-drain/:
git log --oneline -N
git diff HEAD~N..HEAD --name-only -- crates/hotpath/src/ crates/hotpath-macros/src/ crates/hotpath-drain/src/
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.
- 1mo ago Changed · +4 lines · +12 tokens per session 11249ce8101f
- 1mo ago Changed · +4 lines 4f510180783e
- 1mo ago First seen · 65 lines · 43 tokens per session scan A ee48ac16cac2
syncmeta is a skill published in the GitHub repository pawurb/hotpath-rs (1,895 stars, last pushed yesterday), licensed MIT. It adds 55 tokens to every session and 1,268 once invoked, about $0.0002 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.
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