evo-thermal-sysid

evo-thermal-sysid is a skill for Claude Code, Codex from OpenLAIR/OpenSkill. It costs 49 tokens per session (512 once invoked), scanned A, original, Apache-2.0.

A system-identification toolkit for testing a simulated HVAC heating system and fitting a simple first-order temperature model. It estimates the system's gain and time constant from heating data.

In plain words
What is it for?
Use it to run open-loop heater step tests, clean temperature readings, estimate model parameters, calculate R-squared and RMSE, and save calibration results as JSON.
Why use it?
It removes the need to calculate model parameters manually from temperature-response measurements. Fit-quality values help show how closely the model matches the collected data.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to run open-loop heater step tests, clean temperature readings, estimate model parameters, calculate R-squared and RMSE, and save calibration results as JSON.

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Install with agentmods
npx agentmods add skills/openlair/openskill/evo-thermal-sysid
Install

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.

Any agent
npx skills add OpenLAIR/OpenSkill --skill evo-thermal-sysid
Clone the repo
git clone --depth 1 https://github.com/OpenLAIR/OpenSkill

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for evo-thermal-sysid

README.md
[![agentmods](https://agentmods.dev/badge/skills/openlair/openskill/evo-thermal-sysid/github.svg)](https://agentmods.dev/skills/openlair/openskill/evo-thermal-sysid)
Your own site
<a href="https://agentmods.dev/skills/openlair/openskill/evo-thermal-sysid"><img src="https://agentmods.dev/badge/skills/openlair/openskill/evo-thermal-sysid/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.

agentmods 80×15 button for evo-thermal-sysid

Your own site · 80×15
<a href="https://agentmods.dev/skills/openlair/openskill/evo-thermal-sysid"><img src="https://agentmods.dev/badge/skills/openlair/openskill/evo-thermal-sysid.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 512 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00049 $0.00512
Opus 5 $0.00024 $0.00256
Sonnet 5 $0.00010 $0.00102
Haiku 4.5 $0.00005 $0.00051

Measured yesterday against content hash 3df09c236884, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

evo-thermal-sysid 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 yesterday.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/sysid_utils.py, scripts/utils.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

tasks-evolved/hvac-control/environment/skills/evo-thermal-sysid/SKILL.md · 44 lines

What it actually says

evo-thermal-sysid

System identification for first-order thermal HVAC systems.

Functions

  • run_calibration_test(sim, heater_power=50.0, duration=60.0) - Run open-loop step test, returns calibration_log dict
  • first_order_step_response(t, K, tau, T_amb, U_step) - First-order model: T_amb + KU_step(1-exp(-t/tau))
  • identify_system_params(calibration_log) - Fit K and tau from calibration data using curve_fit
  • filter_temperature_data(temp_data, window_length=11, polyorder=2) - Savitzky-Golay filter
  • calculate_fit_metrics(T_actual, T_predicted) - Returns (r_squared, rmse)
  • save_calibration_results(calibration_log, estimated_params) - Save JSON files to /root/

Usage

import sys
sys.path.insert(0, '/app/environment/skills/evo-thermal-sysid/scripts')
from sysid_utils import run_calibration_test, identify_system_params, save_calibration_results

sys.path.insert(0, '/root')
from hvac_simulator import HVACSimulator

sim = HVACSimulator()
calib_log = run_calibration_test(sim, heater_power=50.0, duration=60.0)
params = identify_system_params(calib_log)
save_calibration_results(calib_log, params)

Key Domain Knowledge

  • First-order thermal model: dT/dt = (1/tau) * (K*u + T_amb - T)
  • Step response: T(t) = T_amb + KU_step(1 - exp(-t/tau))
  • K ~ 0.12 C/% power, tau ~ 40s for typical HVAC
  • Use Savitzky-Golay filter (preserves exponential shape) not moving average
  • Use curve_fit with bounds ([0.001, 1.0], [1.0, 200.0]) and maxfev=10000
  • Calibration needs >= 30s duration, >= 20 data points
  • R-squared > 0.95 indicates good first-order fit
Files

What ships with it

2 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.

Changes

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.

  1. yesterday First seen · 44 lines · 49 tokens per session scan A 3df09c236884

Subscribe to this mod's changes

evo-thermal-sysid is a skill published in the GitHub repository OpenLAIR/OpenSkill (88 stars, last pushed yesterday), licensed Apache-2.0. It adds 49 tokens to every session and 512 once invoked, about $0.0002 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 2026-09-11.

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