🌉 Folio VII · The Universal A2A ↔ MCP Symbiotic Bridge
When a multi-agent swarm coordinates over A2A and invokes real-world tools over MCP, authority never widens and never travels blind: every hop narrows scope in microseconds, every tool schema is pinned under RFC 8785 JCS, and every empirical claim traces back to a verified Merkle leaf.
Folio VII self-test: 8/8 mutants killed · specimen 100/100 · all_invariants_passed = True
⚖️ Ma'at Honesty (WO-13)
This folio is an algorithmic, cryptographic and cognitive self-assessment of A2A ↔ MCP delegation and provenance. It is not a certified hardware security module (FIPS 140-3 / Common Criteria), not a medical device and not a physical safety-rated function.
🏛️ The Three Pillars of the Bridge
Pilar I · Dual Golden Seal (pip-zero stdlib): public NIST P-256 ES256 low-S anchor (byte-for-byte identical to OpenSSL) paired with chained HMAC-SHA256 Macaroon caveats for offline attenuation without private keys.
Pilar II · MCP Schema Harmony Gate: surgical fail-closed pause of only the tool exhibiting JCS SHA-256 drift or lexical prompt-injection hazards, keeping sibling tools healthy until replay-locked human ES256 re-consent.
Pilar III · Merkle-DAG Provenance & Rational Homeostasis: RFC 6962 leaves (0x00/0x01) with sticky UNTRUSTED_EXTERNAL_DATA taint, binding into Folio VI VerifiedKnowledgeEnvelope, and instant veto cascade (Twist = 0 in Q³).
📜 The 7 Hard Laws B1..B7
| B1 | Dual Golden Seal | Pure-stdlib NIST P-256 JOSE ES256 low-S anchor + chained HMAC-SHA256 Macaroon caveats |
| B2 | Monotonic Semilattice | Tools ⊆ parent, JCS pins immutable, tenant_soul_hash invariant, cycle-free chain, strict hop decay |
| B3 | MCP Schema Harmony Gate | RFC 8785 JCS SHA-256 pin + lexical hazard scan; surgical fail-closed pause of drifted tool only |
| B4 | Merkle-DAG Provenance | RFC 6962 leaves (0x00/0x01), sticky UNTRUSTED_EXTERNAL_DATA taint, rational claim grounding -> Folio VI VKE |
| B5 | Rational Swarm Homeostasis | Exact fractions.Fraction energy conservation (Σ child ≤ parent, L ≤ B), zero IEEE 754 float drift |
| B6 | Rule 14 ZK & Veto Cascade | Idempotent VVK/PII masking, zero biometrics, O(|subtree|) revocation coupled to Folio V Twist = 0 in Q³ |
| B7 | Notary & W3C VC 2.0 | RFC 6962 commitment STH, EU AI Act Art. 50(1), IEEE 7001 five audiences, MaatSymbioticBridgeCredential |
💎 The 5 Symbiotic Rings (exact rational weights summing to 1)
ring_i_dual_seal_and_monotonic_attenuation | 1/4 |
ring_ii_mcp_schema_harmony_and_lexical_gate | 1/5 |
ring_iii_merkle_dag_provenance_and_grounding | 1/5 |
ring_iv_rational_homeostasis_zk_and_veto_cascade | 1/5 |
ring_v_rfc6962_ieee7001_eu_ai_act_w3c_vc | 3/20 |
🧪 Live Simulator of the Symbiotic Bridge
🐍 100% Pure Python stdlib Core (pip-zero)
A single zero-dependency module: run all 8 adversarial mutants in isolated Python via python3 -I logic/symbiosis/a2a_mcp_symbiotic_core.py.
# 100% Python stdlib — zero pip packages required:
python3 -I logic/symbiosis/a2a_mcp_symbiotic_core.py
from logic.symbiosis import (
MCPToolHarmonyRegistry, RevocationRegistry,
attenuate_symbiotic_token, evaluate_mcp_tool_call_gate, mint_symbiotic_root_token,
)
# Root ES256 anchor -> microsecond HMAC-SHA256 worker attenuation -> fail-closed MCP schema gate