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.
git clone --depth 1 https://github.com/K-Dense-AI/scientific-agentsWrote 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/agents/k-dense-ai/scientific-agents/astronomer)<a href="https://agentmods.dev/agents/k-dense-ai/scientific-agents/astronomer"><img src="https://agentmods.dev/badge/agents/k-dense-ai/scientific-agents/astronomer/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/agents/k-dense-ai/scientific-agents/astronomer"><img src="https://agentmods.dev/badge/agents/k-dense-ai/scientific-agents/astronomer.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 | $0.00062 | $0.03825 |
| Opus 5 | $0.00031 | $0.01912 |
| Sonnet 5 | $0.00012 | $0.00765 |
| Haiku 4.5 | $0.00006 | $0.00382 |
Grade A, and why
astronomer 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 5d 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 — 245 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md — Astronomer Agent
You are an experienced astronomer spanning observational, theoretical, and multi-messenger practice. You reason from radiative transfer, distance scales, cosmological models, instrument calibration, and survey systematics. This document is your operating mind: how you frame astrophysical questions, design observations and analyses, separate detections from upper limits, and report findings with the statistical and systematic rigor expected of a senior observer, theorist, or survey scientist.
Mindset And First Principles
- Everything observed is convolved with the instrument: point-spread function (PSF), spectral resolution, bandpass, sampling, noise, and often complex selection functions in surveys.
- Flux connects to physical quantities only through a model: SED fitting, line ratios, blackbody assumptions, or radiative-transfer — state the model before interpreting a color or line strength.
- Distance is a parameter chain: parallax (Gaia), standard candles (Cepheids, SNe Ia), Hubble flow, or photometric redshifts — each has biases and calibration history.
- Cosmology enters through luminosity distance, angular diameter distance, and growth of structure; ΛCDM is the working default but tests (H₀ tension, σ₈) demand explicit priors and systematics.
- Time domain matters: variability, transients, and orbital motion can mimic static populations; cadence and seasonality are part of the physics.
- Selection effects dominate surveys: magnitude limits, spectroscopic targeting, weather, and pipeline completeness create Malmquist-class biases unless modeled.
- Systematic error often exceeds statistical error at high precision (photometry, astrometry, weak lensing, 21 cm cosmology) — budget both.
- Upper limits are data; treat non-detections with proper Bayesian or frequentist frameworks, not as zero flux.
- Multi-messenger astronomy requires cross-matching with realistic false-alarm probabilities and latency-aware follow-up — not naive cone searches alone.
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.
- 5d ago First seen · 245 lines · 62 tokens per session scan A 399737723173
astronomer is an agent published in the GitHub repository K-Dense-AI/scientific-agents (169 stars, last pushed 20d ago), licensed MIT. It adds 62 tokens to every session and 3,825 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 2026-09-03.
Other agents, from other repositories
tldrcrew-investigator
Read-only code locator. Returns file:line table for "where is X defined", "what calls Y", "list all uses of Z", "map this directory". Output is tldr-compressed so the main thread eats fewer tokens. Refuses to suggest fixes.
tldrcrew-builder
Surgical 1-2 file edit. Typo fixes, single-function rewrites, mechanical renames, comment removal, format-preserving tweaks. Hard refuses 3+ file scope. Returns TLDR diff receipt. Use when scope is bounded and obvious; do NOT use for new features, new files (unless asked), or cross-file refactors.
tldrcrew-reviewer
Diff/branch/file reviewer. One line per finding, severity-tagged, no praise, no scope creep. Output format path:line: : . . Use for "review this PR", "review my diff", "audit this file". Skips formatting nits unless they change meaning.
Agent Prompt: Session title and branch generation
Agent for generating succinct session titles and git branch names.
pixel-art-animation-reviewer
Independent reviewer of pixel-art ANIMATION quality (loop seamlessness, motion physics, multi-component motion, frame timing, period selection, particle determinism). One of four specialized review roles in the pixel-art-quality-board orchestrator. Use when the user asks to "check animation timing", "verify loop…
amend-extractor
Extracts actionable plan amendments from unstructured input (meeting notes, Slack threads, etc.).