Borrowing it
Nothing to install: this file belongs to puran-water/water-chemistry-mcp. 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/puran-water/water-chemistry-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/puran-water/water-chemistry-mcpWrote 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/instructions/puran-water/water-chemistry-mcp/claude-md)<a href="https://agentmods.dev/instructions/puran-water/water-chemistry-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/puran-water/water-chemistry-mcp/claude-md/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/instructions/puran-water/water-chemistry-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/puran-water/water-chemistry-mcp/claude-md.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 | $0.05898 | $0.05898 |
| Opus 5 | $0.02949 | $0.02949 |
| Sonnet 5 | $0.01180 | $0.01180 |
| Haiku 4.5 | $0.00590 | $0.00590 |
Grade A, and why
water-chemistry-mcp CLAUDE.md 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 12d 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 — 633 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Water Chemistry MCP Server System Prompt
Overview
AI agent with access to Water Chemistry MCP Server for industrial wastewater treatment modeling using PHREEQC. CRITICAL: Uses PHREEQC notation, not standard chemical formulas.
Server: water_chemistry_mcp
17 Registered Tools:
Core Analysis (5 tools):
calculate_solution_speciation- Water quality analysissimulate_chemical_addition- Treatment simulationsimulate_solution_mixing- Stream blendingpredict_scaling_potential- Scaling risk assessmentbatch_process_scenarios- Parallel processing with optimization scenario types
Dosing & Database (2 tools):
6. calculate_dosing_requirement - Binary search for target pH/hardness/SI
7. query_thermodynamic_database - Query minerals, elements, species
Advanced PHREEQC Features (4 tools):
8. simulate_kinetic_reaction - Time-dependent reaction modeling
9. simulate_gas_phase_interaction - Gas equilibria (CO2 stripping, O2 transfer)
10. simulate_redox_adjustment - Redox potential (pe/Eh) control
11. simulate_surface_interaction - Surface complexation modeling
Optimization Tools (5 tools):
12. generate_lime_softening_curve - Complete dose-response curves
13. calculate_lime_softening_dose - Optimal lime softening dose
14. calculate_dosing_requirement_enhanced - Multi-objective dosing optimization
15. optimize_multi_reagent_treatment - Multi-reagent with 4 strategies
16. calculate_phosphorus_removal_dose - Unified P removal (Fe/Al/Mg/Ca strategies) with HFO/HAO surface complexation
Diagnostics (1 tool):
17. get_engine_status - Engine health check and database availability
Scientific Integrity & Engineering Efficiency
- PHREEQC thermodynamics only - All results from validated PHREEQC calculations
- Comprehensive precipitation modeling - Full database mineral lists by default
- Smart optimization bounds - Stoichiometry used internally for efficient search ranges
- Technical focus - No economic estimates, purely scientific results
- PHREEQC Subprocess support - Subprocess mode for full database compatibility
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.
- 12d ago First seen · 633 lines · 5,898 tokens per session scan A 71452a5fae65
water-chemistry-mcp CLAUDE.md is an instructions file published in the GitHub repository puran-water/water-chemistry-mcp (3 stars, last pushed 6mo ago), licensed MIT. It adds 5,898 tokens to every session, about $0.0295 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 2026-08-31.
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