Sourced carbon emission factors + audit-traced calculations an AI can cite.
| Endpoint | https://mcp.greencalculus.com (streamable-http) |
|---|---|
| Registry version | 1.0.4 |
| Now | 13 tools · grade F (30) · pin ts_76ae1037f059a94946909b1751c85508 · protocol 2025-06-18 |
| First / last listed | 2026-11-08 02:14 UTC / 2026-11-08 02:14 UTC |
| Grade over time | 2026-11-08: F (30), 13 tools |
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Tools: lookup_factor search_factors lookup_factors calculate_activity calculate_embodied calculate_pcaf calculate_electricity calculate_freight calculate_spend calculate_business_travel calculate_cii resolve_factor explain_absence
lookup_factor | Look up a single greenhouse-gas emission factor by its canonical key. Returns the value plus an audit envelope: provenance (publisher, exact source reference, retrieval date, LICENCE and whether it may be redistributed, with the attribution the licence requires) and verification (whether the per-gas components sum to the headline, the GWP set, and the source note stating what the publisher did NOT params: key* |
search_factors | Find emission factors by section, key prefix, or free text. Returns each match with its key, name, section, VALUE, unit and gas — enough to choose between them or read a few numbers without a second call. For one factor's full audit envelope (publisher, exact source reference, retrieval date, licence, verification) call lookup_factor; for several, call lookup_factors. params: query, section, key_prefix, limit |
lookup_factors | Look up SEVERAL emission factors by key in one call, each with the same audit envelope lookup_factor returns — provenance (publisher, exact source reference, retrieval date, licence, redistribution) and verification. Use this instead of calling lookup_factor in a loop: a portfolio or a multi-country comparison is one call, not one per factor. Keys that do not exist come back in `not_found` rather params: keys* |
calculate_activity | Turn activity data into greenhouse-gas emissions: emissions = activity × factor. Give an amount + unit and a factor key; the unit engine converts to the factor basis (MWh→kWh, tonne→kg, gallon→litre, mile→km) and returns the emissions with the working, the GHG Protocol scope, and the source. Use search_factors / lookup_factor to find the factor key. params: activity*, factor_key* |
calculate_embodied | Whole-life embodied carbon for materials, per EN 15978. Give a material key + quantity (+ optional boundary A1-A3 / A1-A4 / A1-A5 / A1-C); it assembles the declared lifecycle modules (A1-A3, B, C1-C4, D) into stages, totals the boundary, reports module D separately, and flags any missing stage as not-assessed (never zero). Find material keys via search_factors (section "materials"). params: materials* |
calculate_pcaf | Compute PCAF Part A financed emissions for a portfolio. Returns each holding's attribution factor and financed emissions, the portfolio total, the outstanding-weighted data-quality score, and the audit trail (formula + PCAF source). params: asset_class, holdings* |
calculate_electricity | GHG Protocol Scope 2 for purchased electricity, both methods. Always returns location-based (grid-average) emissions; also returns market-based when you supply a contractual supplier_factor (e.g. a green tariff / REC = 0) or a market_factor_key (residual mix). Find grid keys via search_factors (section "grid"). params: consumption*, location_factor_key*, market_factor_key, supplier_factor |
calculate_freight | Freight & logistics emissions (Scope 3 Cat 4 & 9), GLEC framework. THE FACTOR'S DENOMINATOR PICKS THE METHOD — check the factor's unit before choosing the input. Per tonne-km: emissions = tonnes × km × factor, send "mass". Per TEU-km (the sea-container family, e.g. freight_detailed.sea.container.trans_suez.dry): emissions = TEU × km × factor, send "teu" — a TEU is a twenty-foot container slot, not params: mass, teu, distance*, factor_key* |
calculate_spend | Spend-based (EEIO) Scope 3 screening: emissions = spend × economic-intensity factor. Spend must be in the factor's own currency/year (no FX). Find sector factors via search_factors (section "spend_based"), e.g. spend_based.us.naics6.541511.custom_computer_programming_services. params: spend*, factor_key* |
calculate_business_travel | Business travel emissions (Scope 3 Cat 6), distance method: emissions = km × passengers × factor. Air factors come in with_rf / without_rf (radiative forcing) variants. Find factors via search_factors (section "business_travel"). params: distance*, passengers, factor_key* |
calculate_cii | IMO Carbon Intensity Indicator (CII) of a ship and its A-E rating for every year 2023-2030 (MARPOL Annex VI regulation 28; IMO guidelines G1-G5). Give the ship type, its capacity (deadweight for cargo ships, gross tonnage for ro-ro, ro-pax and cruise ships), the distance sailed in the calendar year in nautical miles, and the fuel burned in tonnes per fuel. Returns attained, required and reference params: ship_type*, capacity*, distance_nm*, year*, fuel*, gross_tonnage, previous_ratings, corrections |
resolve_factor | Find the best emission-factor key(s) for a plain-language description — the hardest step is picking the right key out of ~16,000. Returns ranked matches, each carrying the key, value, unit and a confidence score; feed the chosen key to a calculate_* tool or lookup_factor. Prefer this over guessing a key. PUT THE COUNTRY IN THE DESCRIPTION. Geography is read from the description text itself, not fr params: description*, section, limit |
explain_absence | Ask why a factor is NOT in the corpus. The reasoned counterpart to coverage: where a country reports zero rows for an inventory family, this says whether that is the world's limit or our backlog. Five classifications: "structural" (no publisher issues this anywhere — stop looking, and do not silently substitute another country), "not_yet_sourced" (a publisher exists and is named; it is our backlog params: country, family, classification |
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