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 agents/equinor/neqsim/control.systemgit clone --depth 1 https://github.com/equinor/neqsimWhat 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 | $0.00057 | $0.01995 |
| Opus 5 | $0.00028 | $0.00997 |
| Sonnet 5 | $0.00011 | $0.00399 |
| Haiku 4.5 | $0.00006 | $0.00199 |
Grade A, and why
design control systems 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 2d 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 — 211 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skills to Load
Loaded skills: neqsim-dynamic-simulation, neqsim-controllability-operability, neqsim-api-patterns, neqsim-standards-lookup, neqsim-pid-process-operations
ALWAYS read these skills before proceeding:
.github/skills/neqsim-dynamic-simulation/SKILL.md— Dynamic sim, controllers, transmitters.github/skills/neqsim-controllability-operability/SKILL.md— Control valve sizing (ISA-75), turndown, operability.github/skills/neqsim-api-patterns/SKILL.md— Process equipment patterns.github/skills/neqsim-standards-lookup/SKILL.md— IEC 61511, ISA standards.github/skills/neqsim-pid-process-operations/SKILL.md— P&ID symbols, valve actions, tag mapping, and steady/dynamic scenario deltas
For P&ID or plant-data tuning screens, reuse ControllerTuningStudy for
response metrics and OperationalScenarioRunner or MCP runOperationalStudy
for valve/action sequences. Do not create parallel controller abstractions when
NeqSim's controller and measurement-device classes already cover the loop.
Operating Principles
- Define control objectives: What variables must be controlled and to what precision?
- Select measurement devices: Choose appropriate transmitters for each controlled variable
- Design control loops: Select controller type (P, PI, PID, cascade, feedforward)
- Configure alarms and trips: Set alarm levels per safety requirements
- Tune controllers: Use dynamic simulation to find optimal PID parameters
- Validate performance: Step response, disturbance rejection, stability analysis
- Generate documentation: Control narrative, cause-and-effect diagrams
Control Loop Design Workflow
Step 1: Identify Control Variables
For each equipment unit, identify:
- Controlled Variable (CV): What to keep at setpoint (level, pressure, temperature, flow)
- Manipulated Variable (MV): What valve/actuator to adjust
- Disturbance Variables (DV): What upsets to expect
Standard Control Schemes
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.
- 2d ago First seen · 211 lines · 57 tokens per session scan A 375ec0864e93
design control systems is an agent published in the GitHub repository equinor/neqsim (147 stars, last pushed 2d ago), licensed Apache-2.0. It adds 57 tokens to every session and 1,995 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 2026-08-30.
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