GreenCalculus
https://mcp.greencalculus.com/mcp ↗
Description
Look up greenhouse-gas emission factors and run standards-based carbon calculations (activity-based, embodied EN 15978, PCAF financed emissions) — every result returns with its exact source cell and data version, so your agent hands back sourced, citable numbers instead of a guess. 13,000+ factors across 50+ categories (grid, fuels, freight, refrigerants, AFOLU, CBAM, construction materials, spend-based EEIO, digital). Free tier, no card.
What our measurements say
GreenCalculus is a remote MCP server published at mcp.greencalculus.com. It has been probed 7 times since 9/10/2026. It answered in 7 of them (100.0%), a near-uninterrupted record. Median response time is 211 ms, placing it among the faster endpoints. It offers a narrow, focused set of 12 tools. On the protocol side it still runs 2025-11-25 and has not moved to the newer spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Tool names clearly indicate purpose (e.g., 'lookup_factor', 'calculate_embodied')
- Comprehensive audit trails and source tracking for all calculations
- Support for multiple standards (EN 15978, PCAF, GHG Protocol)
Weaknesses
- Some descriptions have incomplete sentences or truncated explanations
- Parameter requirements for some tools are not explicitly marked as optional/required
- Tool names like 'calculate_embodied' could be more distinct from 'calculate_activity'
lookup_factors— Description mentions 'audit envelope' but doesn't clarify if parameters are optionalcalculate_embodied— Description cuts off mid-sentence ('no' at end)search_factors— Description ends abruptly with 'licence, ve'resolve_factor— Confidence score explanation lacks context for interpretation
Verdict
Event narrative
Risk: medium
- 2026-09-10T21:16:35.016Z — era was 'auth-gated', complianceScore was null · indicates pre-transition state with incomplete reliability metrics
- 2026-09-11T01:59:45.474Z — era changed to 'legacy', complianceScore rose to 100 · confirms successful transition to stable legacy configuration with full compliance
Advice
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test passed · last run:
- Cold-start: cold 40ms → warm 39ms (penalty 1ms)
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Server build: — → 1.0.0
- Supported versions: — → 2025-11-25
- Era changed: Auth-gated → Legacy
- Added to watch — era: Auth-gated
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