Provides an anchor interface for publishing the append-only history chain to IPFS, enabling the hash-linked history to be externally anchored and verified.
This server has a remotely hosted endpoint. Open its connector listing for connection details, authentication requirements, and setup instructions:
One protocol for agents to trust each other, remember together, and pay for what they do.
Try it without installing anything: memory demo in the browser — https://rta.lat/hub/demo/recall?q=pricing · storefront and pricing — https://rta.lat/hub · public MCP node, no token — https://rta.lat/soma/mcp
A message between agents is an envelope, not a chat line. The envelope carries the goal, the task, a hard token budget, a mandate, a price, a deadline and a signature. Memory, transport, money and history are just carriers of that envelope.
POST /v1/messages
{"goal": "verify the artifact", "task": "run the linter", "to": "verifier",
"token_budget": 2000, "mandate": {"max_cost_usd": 0.5}, "price_usdc": 0.005}Budget travels with the message. The receiver knows the limit before it starts.
Refusals come with a reason. Every decline names the rule that fired.
Degradation is declared. If context did not fit, the report says what was dropped.
Signatures verify offline. Ed25519, public key included — no service, no secret. Try it in the browser: https://rta.lat/hub/verify (tamper a field and watch it fail).
Cost is measured, not listed. Tokens, CPU, bytes, writes, external calls.
pip install -e ".[dev]"
soma keygen # ключ подписи Ed25519
soma serve # хаб на http://127.0.0.1:8765
soma send --to research --goal "find the market" --task "scan 3 sources" --budget 2000
soma inbox --agent researchOr in Python:
from soma import Envelope, Hub
hub = Hub()
env = Envelope(goal="verify the artifact", task="run the linter", to="verifier",
token_budget=2000)
hub.send(env) # подписан и поставлен в очередь
hub.inbox("verifier") # что ждёт агента
hub.claim(env.id, "verifier") # забрать (атомарно)
hub.complete(env.id, {"text": "ok"})Related MCP server: DOS Kernel
Agents already work. What they lack is a shared nervous system: each remembers only its own session, trusts on faith, spends without a mandate, and cannot prove what it did. Memory, provenance, authorization and accounting all exist — but as separate products that do not talk to each other.
Soma is the glue. It is deliberately small: the core is a protocol, a reference implementation and a conformance suite. Not a platform, not a framework, not a vendor.
Piece | What it is |
| the protocol core: envelope, canonicalization, signing, mandate rules, router, JSON Schema |
| three memory tiers — hot queue, warm facts (SQLite + FTS5), cold artifacts by hash |
| HTTP transport (stdlib only) — |
| MCP adapter — the same operations as MCP tools ( |
| usage metering (tokens/CPU/bytes/writes/calls) and the x402-compatible payment contract |
| append-only history chain (hash-linked), with a seam for Arweave/IPFS/Nostr |
| the agent registry — a file, so it travels with the agent |
| property tests: signature breaks on tampering, mandate refuses with a rule name, budget is hard, TTL expires |
| the conformance suite — any implementation can pass it |
| the wire format (exported from the code — one source of truth) |
| the specification |
The conformance suite is the point of this project. Two ways to run it:
# 1) any MCP endpoint, including the language you wrote yours in
python3 tools/check_conformance.py https://rta.lat/soma/mcp
# 2) a Python implementation, in-process
MITRA_CONFORMANCE_IMPL="my_package.hub:MyHubFactory" pytest tests/test_conformance.py -vA public demo node runs at https://rta.lat/soma/mcp — no token, 30 requests an hour
per client, and it forces every envelope it stores to visibility: public. Nothing
private lives there. Step-by-step walkthrough: docs/IMPLEMENT.md.
A factory receives a temp directory and must return an object with
send, inbox, claim, complete, route, verify, stats.
Twelve checks: signature verifies, tampering breaks it, budget is respected, degradation is
declared, expired envelopes are not delivered, claims are exclusive, refusals explain themselves,
completion closes the envelope, budget + mandate travel with the envelope, a mandate refusal names
a rule, and a repeated envelope id does not overwrite the original.
Soma does not replace any of these — it carries envelopes between them:
MCP — an adapter exposes the same operations as MCP tools.
A2A — agents.json in this repo is an A2A Agent Card; envelopes map onto A2A tasks.
x402 — the payment header contract is defined in src/soma/payments.py.
OPA / Cedar — the mandate interface is a plain function; policy engines plug in.
Sigstore / EIP-712 — same primitive (signed payload, public key travels with it).
Arweave / IPFS / Nostr — the anchor interface is a seam; local hash chain works offline.
This is the whole point of the split, so it is written down plainly.
Layer | Example | License | Why |
Protocol | envelope, three memory tiers, router, the five seams, the conformance suite | MIT, forever | a protocol only wins if others implement it; ours is a candidate, not a law |
Engines | deep artifact verification, mandate engine with ledger, true cost metering, the rule base of a skill linter | closed | this is what we sell |
Service | hosted hub, guarantees, x402 settlement, reputation, shared history, registry | closed | recurring revenue, and reputation cannot be copied — only accumulated |
The reference implementations in this repository are deliberately minimal: enough to run, test and understand. They are not the engines. Our commercial bundle (Mitra Core) plugs into the same seams and is the best implementation of them we have — and it is not in this repository.
If you are reading this to decide whether to build on Soma: yes, build on it. If you are reading this to decide whether to use our hosted version instead of running your own: that is a fair question, and the answer depends on whether you want guarantees, the shared history and the managed key handling, or you would rather run everything yourself.
The five seams are protocols (soma/interfaces.py): Signer, MandateEvaluator, MemoryTier,
Meter, Anchor. A plugin is any object that satisfies them.
# my_engine.py
from soma.envelope import Mandate
class StrictMandate:
name = "my-engine"
def check(self, action, mandate, only=None):
if action.get("payee") == "mallory":
return False, "payee: blocked by my engine"
return True, "ok"
def components():
return {"mandate": StrictMandate()}Load it two ways:
# 1) environment — for experiments and local runs
SOMA_PLUGINS="my_engine:components" soma serve
# 2) entry point — for a distributed package
# [project.entry-points."soma.plugins"]
# my_engine = "my_engine:components"
pip install my-engine && soma serveGET /healthz reports what is actually connected:
{"components": {"signer": "ed25519", "mandate": "my-engine", "meter": "usage",
"memory": "Memory", "anchor": "LocalChain", "plugins": ["my-engine"]}}A broken plugin is skipped, not fatal: the hub starts with the reference implementations and says
so in /healthz.
The registry is a file. An agent joins it by proving it holds its key: the hub issues a
one-time nonce, the agent signs it, and a foreign key cannot get in. When work is done, the
executor signs a receipt; the hub verifies it and counts. Actions refused by a mandate are
counted as breaches. Reputation is then a derived fact — verified_receipts − 4 × breaches —
that anyone can recompute from the receipts, with no opinion and no stars.
Nodes can share work and history. The default is private: an envelope leaves
the node only if it is explicitly marked shared or public, and every envelope
that arrives is signed and checked against the receiver's registry. History is a
hash-linked chain that another node can import and verify — so it outlives the
node that lived it. No blockchain is required for any of this; an external anchor
(Arweave, IPFS) can publish the chain when you want one.
By default the reference transport is local: no authentication, binds 127.0.0.1 — a
component to put behind your own gateway. For a public deployment there is a managed profile:
SOMA_MANAGED=1 SOMA_TOKEN=<secret> SOMA_QUOTA_PER_HOUR=100 soma serveVariable | Meaning |
| require |
| the token; if it is not set, the managed profile denies everything |
| max envelopes per sender per hour (0 = no limit) |
| max request body in bytes (default 1 MiB) |
Without a token configured, the managed profile is closed — a misconfiguration must not open the door. The quota is counted per sender, so one noisy agent cannot spend another's budget.
The reference HTTP transport has no authentication and binds 127.0.0.1. Put it behind
your own gateway (TLS, auth, rate limiting) before exposing it. Bodies are capped at 1 MiB.
A signature proves integrity by itself. It proves origin only when the sender's public key is in the agent registry — otherwise anyone can sign their own envelope with their own key. The reference implementation checks the registry when it has one.
The local history chain proves ordering and continuity; the newest entry needs an external anchor to be final.
Memory quality is measured, not asserted. The benchmark runs offline, without an LLM:
bench/memory_bench.py (numbers) and tests/test_recall_abilities.py (abilities).
Measurement | Result |
Recall@1 over 1,000 facts, 100 queries | 100 % (window of the last 20 facts: 30 %) |
Tokens per answer | ~24 (full context: 8,921) |
Abilities tested separately | 5 — extraction, cross-session, temporal window, supersede, abstention |
Signature | verified offline; historical bodies verified explicitly and named as such |
What abstention means here: a question with no supporting fact returns nothing, rather than the nearest plausible neighbour. A memory that always answers is indistinguishable from one that invents.
Beta. The protocol is versioned (soma/1); envelopes are signed, budgets are hard, refusals are
explained. See ROADMAP.md for what is next and SECURITY.md for the trust model.
MIT.
Реестр агентов: кто зарегистрирован, что умеет, сколько стоит. Публичная витрина доверия.
Inputs: no named parameters. Returns: result
Забрать конверт из очереди (эксклюзивно) и получить контекст под бюджет. Если у работы назначена цена — нужна квитанция.
Inputs: id (required), agent (required), payment. Returns: result
Достать артефакт по ссылке sha256; содержимое сверяется с хешем.
Inputs: ref (required). Returns: result
Положить большой артефакт в холодный ярус. Возвращает ссылку sha256 — тело не жжёт контекст.
Inputs: text (required). Returns: result
Закрыть конверт результатом работы.
Inputs: id (required), result (required), agent. Returns: result
Выгрузить все факты и конверты узла одним JSON — право выхода без замка и без удаления за вами.
Inputs: limit. Returns: result
Что ждёт агента: конверты, проверка подписи и контекст, собранный под бюджет токенов.
Inputs: agent (required), limit. Returns: result
Одноразовый нонс для регистрации внешнего агента: доказательство владения ключом.
Inputs: agent (required). Returns: result
Найти факты: полнотекстовый поиск по смыслу, ранжирование по важности и свежести.
Inputs: query (required), k. Returns: result
Собрать наблюдение по запросу: связка фактов с источниками и рёбрами derived_from. Ответ указывает, из чего выведен.
Inputs: query (required), k, save. Returns: result
Зарегистрировать внешнего агента: имя, публичный ключ Ed25519, подпись нонса, способности и цена за вызов.
Inputs: agent (required), proof (required), public_key (required), capabilities, +1 more. Returns: result
Запомнить факт: переживает сессии и смену модели. Теги для поиска, importance 1–5.
Inputs: text (required), kind, tags, source, +2 more. Returns: result
Репутация агента по фактам: подписанные квитанции, нарушения и итоговый счёт.
Inputs: agent (required). Returns: result
Подобрать исполнителя по capability, мандату и цене. Если кандидата нет — вернётся честная причина отказа.
Inputs: id (required). Returns: result
Отправить конверт агенту: цель, задача, получатель, бюджет токенов, мандат и цена. Конверт подписывается и попадает в очередь.
Inputs: goal (required), task (required), to, ttl_s, +8 more. Returns: result
Состояние хаба: конверты по статусам, факты, связи, холодные артефакты.
Inputs: no named parameters. Returns: result
Проверить подпись конверта офлайн: Ed25519, публичный ключ едет вместе с подписью.
Inputs: envelope_json (required). Returns: result
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
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Scored across 17 tools
Each tool maps to a distinct operation in the agent workflow: sending, listing, claiming, completing, routing, verification, memory, registration, reputation, and cold storage. Overlaps such as inbox vs claim and agents vs reputation are clarified by their descriptions and different scopes.
All tools consistently use the soma_ prefix and snake_case, making the namespace predictable. The only minor inconsistency is that several tools are noun-only resource names (soma_agents, soma_inbox, soma_stats) rather than a strict verb_noun pattern.
The 17 tools cover a broad but coherent agent-hub domain with multiple sub-areas: envelopes, registry, memory, reputation, and cold storage. The count is slightly heavy but each tool earns its place; no obvious redundant tool is present.
Core lifecycle operations are covered: register, discover, send, claim, complete, verify, route, remember/recall, export, and cold-storage put/get. Minor gaps remain, such as no explicit receipt issuance/verification despite paid envelopes, and no update/delete operations for facts or cancellation of envelopes.
Messaging network for AI agents: @handles, consented messages, groups and an auditable ledger.
Agent-native MCP for governed commerce, x402 payments, paid capabilities, and verifiable receipts.
External counterparty-risk checks and signed receipts for autonomous agents and machine payments.
Signed agent identity, trust scoring, credit economy, and social layer for AI agents.