atlarium-mcp

Atlarium Habitat Database MCP

Public read-only MCP server for Atlarium habitat data, diagnostics, products, calculators and advisory planning.

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Atlarium Habitat Database MCP gives AI agents structured access to public

Atlarium data and advisory functions for aquariums, marine tanks, coldwater

systems, terrariums, paludariums and vivariums. It exposes 39 public read-only

tools for species, plants, products, guides, algae, diseases, plant problems,

medicines, compatibility, fertilization, calculators and complete habitat

planning without exposing Atlarium accounts, private workspaces, admin APIs or

write operations.

At A Glance

`https://atlarium.bio/mcp` is documentation. The canonical Streamable HTTP MCP

endpoint is `https://mcp.atlarium.bio/mcp`.

What You Can Build

All outputs are advisory. Compatibility checks, diagnostics, fertilization

plans, equipment estimates, aquarium calculators and tank suggestions should be

verified against real livestock, equipment, water chemistry, local regulations

and husbandry constraints.

Quickstart

Use any MCP client that supports remote Streamable HTTP servers:

{
  "mcpServers": {
    "atlarium": {
      "type": "streamable-http",
      "url": "https://mcp.atlarium.bio/mcp"
    }
  }
}

Claude Code remote HTTP example:

claude mcp add --transport http atlarium https://mcp.atlarium.bio/mcp

Smoke check the live endpoint:

curl --fail --silent --show-error https://mcp.atlarium.bio/health
curl --fail --silent --show-error https://mcp.atlarium.bio/.well-known/mcp/server-card.json
pnpm mcp:monitor:public

Client Setup

These are compatibility notes, not vendor endorsements. Do not make vendor or

directory support claims for ChatGPT, Claude, Cursor, Windsurf, VS Code,

Antigravity or any directory unless that vendor has accepted the listing.

ChatGPT App And Widget

The server advertises a read-only MCP Apps / ChatGPT Apps widget resource for

Apps-compatible hosts:

The widget renders public habitat results, profiles, diagnostic summaries,

product results, calculator output, compatibility summaries, fertilization

plans and habitat suggestions. It does not add write access and does not expose

workspace, auth, admin, journal, schedule or measurement data.

Widget-only development screenshots and a short demo recording are checked in

under `docs/assets/chatgpt-screenshots/` and `docs/assets/chatgpt-app-demo.mp4`.

Real host-level web and responsive 390x844 captures are stored under

`docs/assets/chatgpt-screenshots/real-host/`; native iOS/Android recording is

still required for the final review package. The v4 / `2.0.3` candidate is live

at the MCP endpoint but is not yet approved as the new ChatGPT App version; do

not describe that app submission as approved until OpenAI accepts it. The

existing dashboard app version `1.0.0` is approved.

Tool Surface

Every tool is registered with read-only annotations:

`readOnlyHint: true`, `openWorldHint: false`, `destructiveHint: false`,

`idempotentHint: true`.

Guided Prompts

The server advertises guided prompts for species search, compatibility, habitat

planning, algae, diseases, plant problems, product selection, fertilization and

tank calculations. Prompts guide clients toward the same public read-only tool

surface; they do not add new capabilities or write access.

Tool Call Examples

Each example shows the MCP tool name and a minimal valid JSON input. Generic

MCP clients receive plain JSON text; Apps-compatible hosts can also use

`structuredContent`.

Catalog, plants and guides

`search_fish`

Purpose: search fish and aquatic animal profiles.

Prompt: "Find beginner-friendly small fish for a 90 L planted tank."

{
  "query": "tetra",
  "language": "en",
  "min_tank_liters": 40,
  "max_tank_liters": 120,
  "limit": 5
}

Output: matching public animal profiles with slugs, localized names, summary

fields and public URLs when available.

`get_fish_profile`

Purpose: retrieve one structured fish or aquatic animal profile.

Prompt: "Show me the Atlarium profile for Neon Tetra."

{
  "slug": "paracheirodon-innesi",
  "language": "en"
}

Output: public profile data, care parameters, taxonomy, relationships and

localized content where available.

`search_plants`

Purpose: search aquatic plant profiles.

Prompt: "Find easy foreground or midground plants for low-tech tanks."

{
  "query": "anubias",
  "language": "en",
  "difficulty": "easy",
  "limit": 5
}

Output: matching public plant profiles with placement, difficulty and public

URLs when available.

`get_plant_profile`

Purpose: retrieve one structured aquatic plant profile.

Prompt: "Open the plant profile for Anubias barteri."

{
  "slug": "anubias-barteri",
  "language": "en"
}

Output: plant requirements, growth information, structured attributes and

localized content where available.

`search_products`

Purpose: search public habitat products.

Prompt: "Find filter products for freshwater tanks."

{
  "query": "filter",
  "language": "en",
  "category": "filter",
  "limit": 5
}

Output: product results with brand/category information and public product URLs

when available.

`get_product_profile`

Purpose: retrieve a public product profile.

Prompt: "Show the product profile for this catalog slug."

{
  "slug": "seachem/prime",
  "language": "en"
}

Output: structured public product data, use cases, brand details and links when

available.

`search_guides`

Purpose: search Atlarium guides and educational content.

Prompt: "Find public guides about cycling an aquarium."

{
  "query": "cycling",
  "language": "en",
  "topic": "aquarium",
  "limit": 5
}

Output: guide matches with title, summary, topic and public URLs when

available.

`get_guide`

Purpose: retrieve one public Atlarium guide.

Prompt: "Open the nitrogen cycle guide."

{
  "slug": "aquarium/nitrogen-cycle",
  "language": "en"
}

Output: structured public guide content and related metadata.

Diagnostics and treatment references

`search_algae`

Purpose: search algae diagnostic profiles.

Prompt: "Find algae profiles for green dust on aquarium glass."

{
  "query": "green dust",
  "language": "en",
  "difficulty": 2,
  "limit": 5
}

Output: algae matches with symptoms, likely causes and advisory guidance.

`get_algae_profile`

Purpose: retrieve one algae profile.

Prompt: "Show the profile for green spot algae."

{
  "slug": "green-spot-algae",
  "language": "en"
}

Output: structured public algae profile with symptoms, causes, prevention and

advisory response.

`search_diseases`

Purpose: search aquatic disease profiles.

Prompt: "Find disease profiles for white spots on fish."

{
  "query": "white spots",
  "language": "en",
  "water_type": "freshwater",
  "limit": 5
}

Output: possible disease profiles and advisory treatment references.

`get_disease_profile`

Purpose: retrieve one disease profile.

Prompt: "Open the ich disease profile."

{
  "slug": "ich",
  "language": "en"
}

Output: symptoms, possible causes, treatment references and disclaimers.

`search_plant_problems`

Purpose: search aquatic plant deficiency, pest and environment profiles.

Prompt: "Find causes for yellowing leaves in aquarium plants."

{
  "query": "yellow leaves",
  "language": "en",
  "type": "deficiency",
  "limit": 5
}

Output: plant problem matches with symptoms, causes and advisory corrections.

`get_plant_problem_profile`

Purpose: retrieve one plant problem profile.

Prompt: "Open the nitrogen deficiency profile."

{
  "slug": "nitrogen-deficiency",
  "language": "en"
}

Output: structured deficiency/problem data and advisory guidance.

`search_medicines`

Purpose: search aquarium medicine and treatment product profiles.

Prompt: "Find public medicine references for ich treatment."

{
  "query": "ich",
  "language": "en",
  "limit": 5
}

Output: medicine/treatment references with public profile data where available.

`get_medicine_profile`

Purpose: retrieve one medicine profile.

Prompt: "Open the profile for a medicine slug."

{
  "slug": "malachite-green",
  "language": "en"
}

Output: structured public medicine reference, use notes and disclaimers.

`match_diagnostic_profiles`

Purpose: match symptom text across algae, disease, plant problem and medicine

profiles.

Prompt: "Match fuzzy white growth on driftwood and stressed fish symptoms."

{
  "query": "white fuzzy growth and fish flashing",
  "language": "en",
  "limit": 8
}

Output: likely public diagnostic profiles grouped by relevance.

Products, equipment and fertilizers

`list_product_categories`

Purpose: list product categories for equipment and fertilizers.

Prompt: "Which public equipment categories are available?"

{
  "language": "en",
  "type": "equipment"
}

Output: localized public category names and identifiers.

`list_product_brands`

Purpose: list public product brands.

Prompt: "List brands matching Seachem."

{
  "language": "en",
  "query": "Seachem"
}

Output: matching public brand names and metadata.

`search_equipment`

Purpose: search aquarium and habitat equipment products.

Prompt: "Find heaters for a freshwater setup."

{
  "query": "heater",
  "language": "en",
  "use_case": "freshwater",
  "limit": 5
}

Output: equipment product matches with structured public catalog fields.

`get_equipment_profile`

Purpose: retrieve one equipment product profile.

Prompt: "Open this equipment profile."

{
  "slug": "eheim/thermocontrol",
  "language": "en"
}

Output: public equipment details, category, brand and usage fields when

available.

`search_fertilizers`

Purpose: search fertilizer products and nutrient profiles.

Prompt: "Find liquid fertilizers for planted aquariums."

{
  "query": "flourish",
  "language": "en",
  "category": "fertilizer",
  "limit": 5
}

Output: fertilizer product matches and nutrient metadata when available.

`get_fertilizer_profile`

Purpose: retrieve one fertilizer profile.

Prompt: "Open this fertilizer profile."

{
  "slug": "seachem/flourish",
  "language": "en"
}

Output: structured fertilizer data, dosing metadata and public catalog details

when available.

Compatibility, water and habitat suggestions

`check_species_compatibility`

Purpose: check basic compatibility among habitat species.

Prompt: "Can Neon Tetra and Corydoras paleatus work in a 90 L planted tank?"

{
  "species": ["Paracheirodon innesi", "Corydoras paleatus"],
  "language": "en",
  "tank_liters": 90,
  "ph": 6.8,
  "temperature": 24
}

Output: advisory compatibility signals, warnings, rationale and constraints.

`get_water_parameters`

Purpose: retrieve recommended water parameters for a fish or plant.

Prompt: "What water parameters does Neon Tetra prefer?"

{
  "slug": "paracheirodon-innesi",
  "type": "fish",
  "language": "en"
}

Output: public temperature, pH, GH/KH and related parameter guidance where

available.

`suggest_species_for_tank`

Purpose: suggest aquatic species based on tank and water parameters.

Prompt: "Suggest beginner-friendly species for a 120 L planted tank."

{
  "tank_liters": 120,
  "language": "en",
  "ph": 6.8,
  "temperature": 24,
  "beginner_friendly": true,
  "planted_tank": true,
  "limit": 8
}

Output: public species suggestions with warnings and basic rationale.

`suggest_habitat_for_tank`

Purpose: suggest a complete public habitat plan.

Prompt: "Plan a balanced planted community habitat for 120 L."

{
  "tank_liters": 120,
  "language": "en",
  "ph": 6.8,
  "temperature": 24,
  "beginner_friendly": true,
  "planted_tank": true,
  "co2": "low",
  "light_level": "medium",
  "setup_intent": "community",
  "target_difficulty": "balanced",
  "water_type": "FRESHWATER",
  "limit": 8
}

Output: fish, invertebrates, plants, products, warnings, motivations, related

guides and advisory disclaimer.

Fertilization

`search_fertilization_regimes`

Purpose: search fertilization regimes and dosing philosophies.

Prompt: "Find regimes for low-tech planted tanks."

{
  "query": "low tech",
  "language": "en",
  "topic": "planted",
  "limit": 5
}

Output: public regime matches with summary, topics and public URLs when

available.

`get_fertilization_regime`

Purpose: retrieve one fertilization regime.

Prompt: "Open the Estimative Index regime profile."

{
  "slug": "estimative-index",
  "language": "en"
}

Output: structured public dosing philosophy/regime details.

`calculate_fertilizer_dose`

Purpose: calculate an advisory fertilizer dose for a catalog product and tank

volume.

Prompt: "Calculate the dose of Seachem Flourish for 120 L."

{
  "brand_name": "Seachem",
  "product_name": "Flourish",
  "volume_liters": 120
}

Output: advisory dose estimate and product-related dosing context.

`calculate_nutrient_gaps`

Purpose: compare nutrient measurements against targets.

Prompt: "Compare my nitrate and potassium readings with planted tank targets."

{
  "language": "en",
  "volume_liters": 120,
  "measurements": [
    {
      "kind": "nitrogen_mg_l",
      "value": 5
    },
    {
      "kind": "potassium_mg_l",
      "value": 8
    }
  ],
  "targets": {
    "nitrogen_mg_l": 10,
    "potassium_mg_l": 15
  }
}

Output: nutrient gap estimates without saving measurements.

`calculate_weekly_dose_totals`

Purpose: calculate weekly totals for a non-persistent dosing plan.

Prompt: "Add up my weekly liquid fertilizer plan."

{
  "language": "en",
  "volume_liters": 120,
  "items": [
    {
      "brand_name": "Seachem",
      "product_name": "Flourish",
      "method": "LIQUID",
      "dose_value": 5,
      "dose_unit": "ml",
      "days_of_week": [1, 3, 5]
    }
  ]
}

Output: weekly product totals and schedule summary.

`generate_fertilization_plan`

Purpose: generate an advisory non-persistent fertilization plan.

Prompt: "Generate a balanced planted tank fertilization plan for 120 L."

{
  "language": "en",
  "volume_liters": 120,
  "regime": "balanced",
  "targets": {
    "nitrogen_mg_l": 10,
    "phosphorus_mg_l": 1,
    "potassium_mg_l": 15,
    "iron_mg_l": 0.1
  }
}

Output: advisory plan, nutrient targets, product suggestions and disclaimer.

Calculators

`calculate_tank_volume`

Purpose: calculate gross and net aquarium volume estimates.

Prompt: "Calculate net volume for a 60 x 30 x 36 cm tank."

{
  "shape": "rect",
  "length_cm": 60,
  "width_cm": 30,
  "height_cm": 36,
  "substrate_depth_cm": 5,
  "hardscape_displacement_liters": 4
}

Output: gross and net volume estimates.

`calculate_tank_weight`

Purpose: estimate aquarium weight from dimensions and material inputs.

Prompt: "Estimate the filled weight of a 120 L aquarium."

{
  "shape": "rect",
  "length_cm": 80,
  "width_cm": 35,
  "height_cm": 45,
  "glass_thickness_mm": 8,
  "substrate_depth_cm": 6,
  "hardscape_weight_kg": 12,
  "equipment_weight_kg": 5
}

Output: advisory total weight estimate and component breakdown.

`calculate_water_change`

Purpose: calculate water change volume, weekly totals and dilution estimates.

Prompt: "How much water is a 30 percent change on 120 L twice per week?"

{
  "volume_liters": 120,
  "change_percent": 30,
  "changes_per_week": 2
}

Output: per-change volume and weekly total estimates.

`calculate_water_chemistry`

Purpose: calculate hardness conversions, CO2, salinity and water mixing.

Prompt: "Estimate CO2 from pH 6.8 and KH 4."

{
  "co2": {
    "ph": 6.8,
    "kh_dkh": 4
  },
  "general_hardness": {
    "unit": "dgh",
    "value": 8
  }
}

Output: public chemistry conversions and advisory estimates.

`convert_units`

Purpose: convert aquarium-relevant units.

Prompt: "Convert 120 liters and 24 C."

{
  "volume": {
    "unit": "l",
    "value": 120
  },
  "temperature": {
    "unit": "c",
    "value": 24
  }
}

Output: converted values for supported units.

`calculate_equipment_requirements`

Purpose: calculate advisory heater, lighting and electricity requirements.

Prompt: "Estimate heater and lighting needs for a 120 L aquarium."

{
  "heater": {
    "volume_liters": 120,
    "ambient_c": 20,
    "target_c": 25,
    "insulation": "normal"
  },
  "lighting": {
    "volume_liters": 120,
    "lumens": 3600
  },
  "electricity": {
    "wattage": 100,
    "hours_per_day": 8,
    "cost_per_kwh": 0.25
  }
}

Output: advisory equipment estimates and electricity usage/cost summary.

Discovery And Directory Status

Publication tracking and reusable submission copy live in

`config/distribution-registry.json`, `docs/publication-checklist.md`,

`docs/directory-submission-payloads.md` and `docs/mcp-submission-cockpit.md`.

Pending, blocked and rejected targets remain in the operational registry and

are not presented as accepted public listings.

Local Development

pnpm install
cp .env.example .env
pnpm dev

By default the server listens on `http://localhost:43118`.

Local development against the Atlarium app:

ATLARIUM_API_BASE_URL=http://localhost:43117/api/public/mcp/v1 pnpm dev

Configuration

• `MCP_PUBLIC_BASE_URL`: public base URL, production default `https://mcp.atlarium.bio`.
• `ATLARIUM_API_BASE_URL`: public read-only Atlarium API base URL.
• `MCP_ALLOWED_HOSTS`: comma-separated host allowlist used for DNS rebinding protection.
• `MCP_TRUST_PROXY`: Express proxy trust setting; default `1` assumes one trusted reverse proxy in production.
• `ATLARIUM_API_TIMEOUT_MS`: upstream public API timeout in milliseconds.
• `ATLARIUM_API_RESPONSE_MAX_BYTES`: maximum upstream JSON response size.
• `OPENAI_APPS_CHALLENGE_TOKEN`: public OpenAI Apps domain verification token served from `/.well-known/openai-apps-challenge`.

Production deployments must run behind a TLS-terminating reverse proxy or

Ingress that overwrites `X-Forwarded-For`, `X-Forwarded-Host` and

`X-Forwarded-Proto` before traffic reaches this server.

Quality Gate

pnpm lint
pnpm typecheck
pnpm test
pnpm build
pnpm audit:prod
docker build -t atlarium-mcp:local .

With a local server running:

pnpm mcp:conformance

With production DNS and TLS live:

pnpm mcp:monitor:public
pnpm directories:submit -- --check
pnpm mcp:validate:public
pnpm mcp:conformance:public

Contributing

See `CONTRIBUTING.md`. Public tool changes must update the server

implementation, tests, server-card metadata, `server.json`, `README.md`,

`docs/mcp.md`, docs, examples and directory publication notes in the same

release.

Security

See `SECURITY.md`. Do not report sensitive security issues in public GitHub

issues.

License

MIT. See `LICENSE`.