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 agentmods add skills/generous-corp/pulp/stretchnpx skills add Generous-Corp/pulp --skill stretchgit clone --depth 1 https://github.com/Generous-Corp/pulpWrote 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/generous-corp/pulp/stretch)<a href="https://agentmods.dev/skills/generous-corp/pulp/stretch"><img src="https://agentmods.dev/badge/skills/generous-corp/pulp/stretch.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 | $0.00050 | $0.05130 |
| Opus 5 | $0.00025 | $0.02565 |
| Sonnet 5 | $0.00010 | $0.01026 |
| Haiku 4.5 | $0.00005 | $0.00513 |
Grade A, and why
stretch 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 today.
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 — 313 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Stretch (offline time-stretch / pitch / varispeed)
pulp::signal::OfflineStretch is the non-realtime, max-quality stretch/pitch
engine. This skill is the agent-facing guide: which character mode to use,
how to fine-tune and share a preset, how to A/B measure, and what's
genuinely good vs. still cooking. Headers:
core/signal/include/pulp/signal/{offline_stretch,stretch_preset}.hpp. Dev CLI:
examples/offline-stretch/stretchcli. Eval toolkit: examples/offline-stretch/eval/.
Most DSP helpers now expose *64 aliases when the underlying class is templated,
including OfflineStretch64 and RealtimePitchTimeProcessor64. The offline
stretch public config remains control-plane double regardless of sample type;
only the sample buffers and internal DSP storage widen for the f64 aliases.
Keep quality comparisons explicit about which sample type is under test.
Finite streaming contract
For clip-ready streaming, prepare RealtimePitchTimeProcessor in
PitchTimeMode::time_stretch and check its PitchTimePrepareStatus.
Non-positive sample rates, channel counts outside the prepared ceiling, and
non-positive max_block capacities are rejected before processor state changes.
Time-stretch sizing also requires a finite max_time_ratio >= 1; pitch sizing
requires a finite, non-negative semitone bound whose derived ratio is finite.
Preparation rejects any otherwise-valid bound whose synthesis hop, power-of-two
ring, or typed backing-buffer byte size is not representable in the target
address space; never rely on a later float-to-int conversion or allocation
failure to police capacity.
Optional FFT overrides must satisfy the spectral engine's 256–16384 power-of-two
window and analysis_hop <= fft_size/2 invariants or preparation rejects them
without changing prior state.
The realtime processor also stages its spectral-envelope analyzer before it
publishes any new configuration or retained processing state. Keep that prepare
transactional: an analyzer capacity failure must leave the previously prepared
processor usable rather than half-adopting the new geometry.
feed() is all-or-nothing: on
backpressure, drain available_stretched() with read_stretched() and retry
the identical input block. Never advance a decoder on a rejected feed.
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.
- today First seen · 313 lines · 50 tokens per session scan A 99fb60a80e5f
stretch is a skill published in the GitHub repository Generous-Corp/pulp (16 stars, last pushed today), licensed MIT. It adds 50 tokens to every session and 5,130 once invoked, about $0.0003 per session on Opus 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 2026-09-04.
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