Borrowing it
Nothing to install: this file belongs to monarch-initiative/dismech. 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/monarch-initiative/dismech/main/.claude/skills/epa-ctx-api/SKILL.mdgit clone --depth 1 https://github.com/monarch-initiative/dismechWrote 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/monarch-initiative/dismech/epa-ctx-api)<a href="https://agentmods.dev/skills/monarch-initiative/dismech/epa-ctx-api"><img src="https://agentmods.dev/badge/skills/monarch-initiative/dismech/epa-ctx-api/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/monarch-initiative/dismech/epa-ctx-api"><img src="https://agentmods.dev/badge/skills/monarch-initiative/dismech/epa-ctx-api.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 | $0.00107 | $0.02760 |
| Opus 5.5 | $0.00043 | $0.01104 |
| Sonnet 5.5 | $0.00021 | $0.00552 |
| Haiku 4.5 | $0.00011 | $0.00276 |
Grade A, and why
epa-ctx-api scanned grade A with 1 finding 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 24d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -s -H "accept: application/json" -H "x-api-key: $CTX_API_KEY" \ How it starts
The opening of the file, as written. The whole thing — 204 lines — stays where its author put it; the contents beside it link to each section on GitHub.
EPA CTX APIs: ToxCast assay metadata
An assay endpoint is one measurement ToxCast makes: a named readout, in a named system, aimed at a named molecular target. This skill covers how to read EPA's descriptions of those endpoints.
Scope: assay metadata only. Chemical results — which chemicals were active in
which assay, at what potency — are deliberately not covered here, and dismech has
made no decision about whether they belong in the knowledge base. That question
is issue #12682. Do not fetch, cache or cite a hit-call on the strength of this
skill, and do not treat ToxCast as a citable reference source: there is no
TOXCAST: reference prefix and nothing under references_cache/.
EPA CTX API URL
The live base URL, taken from EPA's own client
(USEPA/ctx-python, src/ctxpy/base.py):
https://comptox.epa.gov/ctx-api/
That host answers. Every data path returns 401 without a key and 200 with
one.
EPA's own CTX API landing page, and dismech issue #12682, both still link
api-ccte.epa.gov, which no longer resolves. Use the base URL above.
The key
A free individual key is requested by emailing [email protected] with your
name, email and organization. It is sent by hand, so allow a day or two.
Pass it as a header on every request. There is no query-parameter form.
curl -s -H "accept: application/json" -H "x-api-key: $CTX_API_KEY" \
"https://comptox.epa.gov/ctx-api/bioactivity/assay/search/by-aeid/1816"
In this repository the key lives in CTX_API_KEY, exported from ~/.zshenv
so every shell and every just recipe inherits it. Never write the key into a
file under the repository.
In this repository
just toxcast-refresh # cache all endpoint annotations under data/toxcast/
just toxcast-refresh --summary # describe what is already cached
just toxcast-refresh --force # refetch
just toxcast-coverage # endpoints whose gene target a pathograph node names
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.
- 24d ago Changed · +26 lines 4e601cd9e3d3
- 28d ago First seen · 178 lines · 107 tokens per session scan A 4c259ed5ccdf
epa-ctx-api is a skill published in the GitHub repository monarch-initiative/dismech (69 stars, last pushed today), licensed BSD-3-Clause. It adds 107 tokens to every session and 2,760 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-27.
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