# greencalculus.com MCP server (slim) > greencalculus.com MCP server, an MCP server by greencalculus.com, listed from the official MCP registry. Indexed, not reviewed: facts and our own checks, no score or ranking. Sourced carbon emission factors + audit-traced calculations an AI can cite. - Full: https://www.anchorterminal.com/tools/greencalculus-api.md (~1,500 tokens) · this version ~1,430 tokens · JSON https://www.anchorterminal.com/tools/greencalculus-api.json · canonical https://www.anchorterminal.com/tools/greencalculus-api - Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04 # greencalculus.com MCP server > Indexed, not reviewed: facts from the official MCP registry and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/ - Kind: MCP server, by greencalculus.com (https://greencalculus.com/developers) - Listed because: It's published in the registry under greencalculus.com, a namespace the registry only gives to whoever proves they control that domain. - What the official MCP registry says: Sourced carbon emission factors + audit-traced calculations an AI can cite. ## Facts - MCP registry: `com.greencalculus/api` 1.0.4 - Endpoint: https://mcp.greencalculus.com (streamable HTTP) - Package: npm `greencalculus-mcp` (stdio) - Website: https://greencalculus.com/developers - npm downloads a week: 46 - Registry entry updated: 2026-09-16 ## Tools - Tools it lists (12, about 2,838 tokens of context, `tools/list` without credentials, checked 2026-10-04 22:22 UTC): - `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,… - `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… - `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,… - `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… - `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… - `calculate_pcaf`: Compute PCAF Part A financed emissions for a portfolio. Returns each holding's attribution factor and financed emissions, the portfolio total, the… - `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… - `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… - `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… - `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)… - `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… - `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… - How its tools read to an agent (0 errors, 21 warnings, 1 note, about 2,838 tokens; rules at https://www.anchorterminal.com/check.md; not part of the score): - warn TC11 calculate_pcaf: 1 parameter without a description: asset_class - warn TC13 calculate_activity: activity (object with no properties) - warn TC13 calculate_business_travel: distance (object with no properties) - warn TC13 calculate_electricity: consumption (object with no properties), supplier_factor (object with no properties) - warn TC13 calculate_embodied: materials[] (object with no properties) - warn TC13 calculate_freight: distance (object with no properties), mass (object with no properties), teu (object with no properties) - warn TC13 calculate_pcaf: holdings[] (object with no properties) - warn TC13 calculate_spend: spend (object with no properties) - warn TC14 explain_absence: allowed values are in the description, not an enum: classification - warn TC16 calculate_activity: no readOnlyHint or destructiveHint - warn TC16 calculate_business_travel: no readOnlyHint or destructiveHint - warn TC16 calculate_electricity: no readOnlyHint or destructiveHint - warn TC16 calculate_embodied: no readOnlyHint or destructiveHint - warn TC16 calculate_freight: no readOnlyHint or destructiveHint - warn TC16 calculate_pcaf: no readOnlyHint or destructiveHint - warn TC16 calculate_spend: no readOnlyHint or destructiveHint - warn TC16 explain_absence: no readOnlyHint or destructiveHint - warn TC16 lookup_factor: no readOnlyHint or destructiveHint - warn TC16 lookup_factors: no readOnlyHint or destructiveHint - warn TC16 resolve_factor: no readOnlyHint or destructiveHint - warn TC16 search_factors: no readOnlyHint or destructiveHint - note TC24 server: 12 of 12 tools have no outputSchema - JSON: https://www.anchorterminal.com/api/v1/tools/greencalculus-api.json - Being indexed says nothing about quality, and nobody can pay for it. 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