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Demand-Indexer — Analysis Agent skill scoring synthesis artifacts on marketability, novelty, demand. Spine ref: A2A Operationalization Index — Spine Footers, JSONL Prompts, Model Variants, Permissions. Plugin hub: genesis-conductor-plugin — One-Click MCP Server, Skill & Plugin for diamondNode.

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Problem

Synthesis artifacts emitted across the 13-surface spine carry no independent market signal. Without a demand score backed by ≥ 2 independent sources, downstream prioritization (Foundry, /maru, Greg charter) reduces to taste.

Invariants

• Anti-fabrication — score requires ≥ 2 independent demand sources (Exa + SerpAPI when swapped in). Single-source scores are rejected, not silently lowered.
• Brand separation — endpoint lives at mcp.genesisconductor.io/v1/demand, not on any product subdomain.
• Reversibility — every score capsule is replayable from stored source snapshots; re-scoring with new sources emits synthesis.cycled rather than overwriting.
• Trace-as-Consent — score persisted only after Ed25519 attestation lands in D1 attestations.

Interface

• Endpoint — POST <https://mcp.genesisconductor.io/v1/demand>
• Auth — Bearer DIAMOND_KEY
• Request — { artifact_id, artifact_type, sources: ["exa"|"serpapi"|...], context? }
• Response — { marketability: 0..1, novelty: 0..1, demand: 0..1, sources_used: string[], attest: { kid, sig }, capsule_id }
• Model variants — primary: GPT-5-mini · extended: Claude 3.5 Sonnet (when context > 32k or dissonance ≥ 0.6)
• Execution location — Cloudflare Worker (gc-mcp-server), downstream: D1 genesis-seismic-log.attestations, Notion via notion-bridge
• Implementation — Genesis Workers — Implementation Bundle §5

A2A-optimized JSONL capsule

{"kind":"demand.scored","surface":"analysis.demand_indexer","capsule_id":"<ulid>","actor":"agent://demand-indexer","model_variant":"gpt-5-mini","exec_location":"cloudflare_worker:gc-mcp-server","refs":["<https://www.notion.so/886abb8d80ba403f803048333e31acf0","https://www.notion.so/3a147b0095104eeebe0c694bf1690c6b","https://www.notion.so/facd6533637a4aad83fc20c8b58a2693"],"payload":{"artifact_id":"><id>","artifact_type":"synthesis|spec|site|skill","sources_used":["exa","serpapi"],"marketability":0.0,"novelty":0.0,"demand":0.0},"attest":{"kid":"dn-2026-05","sig":"<ed25519>"},"ts":"<iso8601>"}

Event family: synthesis.cycled (re-score) or new demand.scored (first-score). Persisted by notion-bridge to the artifact's source page; attested by gc-diamond-node.

Risks