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 agentlas-ai/agentlas-desktop --skill pkpd-modelinggit clone --depth 1 https://github.com/agentlas-ai/agentlas-desktopWrote 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/agentlas-ai/agentlas-desktop/pkpd-modeling)<a href="https://agentmods.dev/skills/agentlas-ai/agentlas-desktop/pkpd-modeling"><img src="https://agentmods.dev/badge/skills/agentlas-ai/agentlas-desktop/pkpd-modeling/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/agentlas-ai/agentlas-desktop/pkpd-modeling"><img src="https://agentmods.dev/badge/skills/agentlas-ai/agentlas-desktop/pkpd-modeling.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00273 | $0.05803 |
| Opus 5.5 | $0.00109 | $0.02321 |
| Sonnet 5.5 | $0.00055 | $0.01161 |
| Haiku 4.5 | $0.00027 | $0.00580 |
Grade A, and why
pkpd-modeling 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.
This is a copy
100% identical to pkpd-modeling — 442 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 399 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Pharmacokinetic and Pharmacodynamic Modelling
When to use
Any question about what the body does to a drug or what the drug does to the body: deriving exposure metrics from concentration-time data, fitting a structural model, building or checking a population analysis, choosing a dose or a regimen, relating exposure to effect, comparing formulations, or scaling to a new population.
The three rules
1. Fix the exposure metric and the analysis population before computing anything. AUC(0-t), AUC(0-inf), AUC(0-tau) at steady state, and Cavg are different quantities and answer different questions. So do AUCinf based on observed versus predicted Clast. Choosing after seeing the numbers is how a negative study becomes positive.
2. Structural model, variability model, and covariate model are three separate decisions. They get conflated constantly — an extra compartment added to absorb what is really unmodelled between-occasion variability, a covariate added to fix what is really a misspecified absorption model. Diagnose which one is wrong before changing any of them.
3. Convergence is not identifiability. A fit that converges with 200% relative standard error on a parameter, or a correlation of 0.99 between two, has told you the data cannot separate them. Every fitting script here reports both and flags them, because the parameter table alone looks fine in exactly this situation.
Scope
This skill computes, diagnoses, and structures. It does not decide that a formulation is
bioequivalent, select a dose for a trial, recommend a dose for a patient, conclude that a drug has
no QT liability, or replace a qualified pharmacometrician, clinical pharmacologist, or the
regulatory review. The scripts report; none of them concludes. tdm_bayes.py in particular is a
modelling aid — any change to a patient's regimen is the treating clinician's decision.
Scripts
cd skills/pkpd-modeling/scripts
| Script | Question answered |
|---|---|
nca.py |
What are the exposure metrics, and is the terminal phase good enough to report them? |
fit_compartmental.py |
Which structural model do these data support, and are its parameters identifiable? |
simulate_regimen.py |
What does this regimen do at steady state, and to what fraction of the population? |
check_popk_dataset.py |
Will NONMEM read this dataset the way I think it will? |
exposure_response.py |
Is there an exposure-response relationship, and is the plateau in the data? |
bioequivalence.py |
Does the 90% CI meet the criterion, and which criterion applies? |
allometry_and_fih.py |
What is the starting dose, or the dose in a smaller/younger population? |
ddi_static.py |
Does the in vitro data trigger a clinical DDI study under ICH M12? |
tdm_bayes.py |
What are this patient's individual parameters from their measured levels? |
What ships with it
27 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.
- assets/nca-reporting-checklist.md 3.4 KB
- assets/popk-analysis-plan.md 4.9 KB
- references/antimicrobial-and-tdm.md 6.1 KB
- references/bioequivalence.md 6.2 KB
- references/dataset-standards.md 5.7 KB
- references/ddi-and-qt.md 6.3 KB
- references/nca-conventions.md 6.7 KB
- references/pbpk.md 5.3 KB
- references/pd-and-exposure-response.md 7.6 KB
- references/population-pk.md 8.0 KB
- references/regulatory-guidance.md 6.1 KB
- references/software-ecosystem.md 6.3 KB
- references/source-ledger.md 6.3 KB
- references/special-populations.md 6.5 KB
- references/structural-models.md 7.3 KB
- references/tmdd-and-biologics.md 6.0 KB
- scripts/_common.py 11 KB runs code
- scripts/_models.py 25 KB runs code
- scripts/allometry_and_fih.py 16 KB runs code
- scripts/bioequivalence.py 20 KB runs code
- scripts/check_popk_dataset.py 17 KB runs code
- scripts/ddi_static.py 15 KB runs code
- scripts/exposure_response.py 14 KB runs code
- scripts/fit_compartmental.py 21 KB runs code
- scripts/nca.py 23 KB runs code
- scripts/simulate_regimen.py 15 KB runs code
- scripts/tdm_bayes.py 13 KB runs code
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 First seen · 399 lines · 273 tokens per session scan A 5b555b3139dd
pkpd-modeling is a skill published in the GitHub repository agentlas-ai/agentlas-desktop (6 stars, last pushed yesterday), licensed Apache-2.0. It adds 273 tokens to every session and 5,803 once invoked, about $0.0011 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to pkpd-modeling, differing in 442 lines, and is treated as a copy.
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