SAIHM MCP Server

Sovereign, encrypted, sharable, persistent memory protocol for AI agents.

· Apache-2.0 · COTI V2 mainnet

Start free, no card — on real infrastructure, via a GitHub sign-in: Free trial. Or evaluate it offline first: runnable demos across every major model, no account needed — See it run.

What this is

A Model Context Protocol server that exposes eight tools any MCP-capable AI agent (Claude Code, Claude Desktop, custom agents) can call to gain a persistent, encrypted memory layer the user owns:

• saihm_remember — store an encrypted memory cell
• saihm_recall — retrieve and decrypt your memories
• saihm_forget — true cryptographic erasure (GDPR Art. 17)
• saihm_status — your protocol-runtime stats and storage tier dashboard
• saihm_share / saihm_revoke_share — selectively share a memory with another agent or user
• saihm_governance_propose / saihm_governance_vote — protocol governance via gSAIHM

Each tool forwards to a SAIHM operator endpoint that runs the full protocol stack on COTI V2 mainnet. The server itself holds no crypto, no storage, and no protocol runtime — those live behind the operator endpoint.

Tool reference

Tool	Title	Behavior
saihm_remember	Remember	writes a new memory cell
saihm_recall	Recall	read-only; safe to repeat
saihm_forget	Forget (GDPR erasure)	destructive — irreversible erasure
saihm_status	Status	read-only
saihm_share	Share	writes a sharing contract
saihm_revoke_share	Revoke share	withdraws a grant
saihm_governance_propose	Propose (governance)	opens a proposal
saihm_governance_vote	Vote (governance)	casts a vote

Each tool carries MCP annotations (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) and a human-readable title, so MCP hosts can gate confirmations and agents can select the right tool at reasoning time.

Companion package

This package speaks MCP and holds no cryptography, so it always needs an operator endpoint and token. Two companions cover the rest:

• @saihm/mcp-server-pro — a drop-in MCP server that performs the client-side cryptography itself and can self-onboard, including the free tier. This is the package to use if you have no endpoint yet — see Free trial.
• @saihm/client-pro — the same client-side cryptography as a library, for embedding in your own application: post-quantum sealing, authenticated sharing, and provable erasure performed on your own machine so the operator stays blind.

See it run

Runnable, one-command demos ground a memory you own in every major model — Claude, GPT, DeepSeek, Qwen, Kimi, GLM — then prove you can erase it, alongside drop-in adapters for LangChain, LlamaIndex, CrewAI, AutoGen, and LangGraph. Each runs offline in about a minute; no account needed.

• Live demos: https://citw2.github.io/saihm-demos/
• demo-claude-code wires this server into Claude Code and Cursor as an MCP server.

Measured — up to ~86% fewer context tokens. Most agents re-send their entire transcript every turn, so context spend grows ~O(N²) over a session; recalling a bounded set of memory cells instead cut input tokens by 62.8%–85.9% across a realistic multi-session coding task. The benchmark is open, offline, and deterministic — reproduce the number rather than trust it:

git clone https://github.com/citw2/saihm-token-benchmark
cd saihm-token-benchmark && npm install && node benchmark.mjs

Install

npm install @saihm/mcp-server
# or run directly without install:
npx @saihm/mcp-server

Configure

The server needs two env vars:

SAIHM_ENDPOINT_URL=https://operator.example.com/mcp
SAIHM_AUTH_HEADER=Bearer <token-issued-by-your-operator>

Don't have an endpoint and token yet? They're issued by a SAIHM operator. This package is deliberately crypto-free, so it needs a custodial operator — one that performs cryptography server-side and returns plaintext.

The hosted SAIHM service at https://saihm.coti.global is not one. It is non-custodial by design: it stores only ciphertext and never holds your keys, so cells sealed there can only be opened by a client that holds them. To use the hosted service — including the free trial (sign in with GitHub, no card) — use @saihm/mcp-server-pro, which seals and opens on your own machine. See Free trial and Join SAIHM below.

Use this package against a custodial operator you run or subscribe to. Until one is configured, the tools have nowhere to reach and will return an error.

• SAIHM_ENDPOINT_URL — the endpoint of the custodial SAIHM operator you run or subscribe to. Not the hosted service at https://saihm.coti.global, which is non-custodial — see the note above.
• SAIHM_AUTH_HEADER — the Authorization header value the operator expects (typically a Bearer <token> issued to you after key-bound enrolment). The server is authentication-agnostic and never transmits raw private keys; the operator's enrolment flow keeps your signing key on your machine.

Place these in a .env file alongside the server (the .gitignore excludes all .env* files from any future repo).

Free trial (sign in with GitHub)

Want to test SAIHM on real infrastructure before you pay? Start a free trial — for testing purposes, no card — by proving you're a unique person once through a GitHub device sign-in. It runs through the non-custodial @saihm/mcp-server-pro client, which seals cells on your own machine so the operator stays blind.

First generate your master secret — it never leaves your machine, and it is the only key to your memory:

openssl rand -hex 32 > saihm-master.key && chmod 600 saihm-master.key

Then activate:

SAIHM_ENDPOINT_URL=https://saihm.coti.global/mcp \
SAIHM_MASTER_SECRET_FILE=./saihm-master.key \
SAIHM_TIER=FREE \
  npx -y @saihm/mcp-server-pro free-join

It prints a short code and a link: open https://github.com/login/device in your browser and enter the code. The sign-in stays in your browser — this client never sees or holds your GitHub token; it is exchanged server-side and kept ephemeral. When free-join returns, start the server normally (drop free-join) and it self-onboards on the free trial. No card, and nothing to cancel — it's a fixed, one-time allowance, not an auto-renewing subscription.

Ready for production? Upgrade in place to a monthly plan — same signing key, same memories, no re-onboarding.

Wire into Claude Code

{
  "mcpServers": {
    "saihm": {
      "command": "npx",
      "args": ["@saihm/mcp-server"],
      "env": {
        "SAIHM_ENDPOINT_URL": "https://operator.example.com/mcp",
        "SAIHM_AUTH_HEADER": "Bearer <token>"
      }
    }
  }
}

What gets persisted, where

The server itself persists nothing. The operator endpoint runs the full protocol stack: cells are encrypted under a per-cell DEK, sealed by a per-agent KEK, persisted to the operator's configured durable storage, and audited on COTI V2 mainnet. See the operator's documentation for tier details, and Storage is the operator's responsibility (by design) below.

Storage is the operator's responsibility (by design)

For operators — read this first. SAIHM does not hard-wire your durable storage to any single provider, and it does not silently provision storage for you. Choosing and configuring where cells are persisted is your job, on purpose. This is a deliberate design choice for operator convenience and data sovereignty — not a missing feature. If memory writes fail with a storage error, it almost always means the backend has not been configured yet.

Why it works this way:

• Provider sovereignty. You decide where your tenants' encrypted cells live. The protocol never locks you to one vendor or one network.
• Local-first, then deep-archive. A typical operator routes writes to a local IPFS (Kubo) node first — fast, authoritative, and under your own control — and then asynchronously to a Filecoin deep-archive provider such as Pinata, Synapse, or Lighthouse. The same content addressing spans both tiers.
• Your memory and your tenants' take the same path. Whatever backend you configure serves both the operator's own memory and every tenant's — there is no separate hidden sink hard-coded to one provider.

What you configure (your operator deployment guide lists the exact settings):

• a reachable IPFS / Kubo endpoint (a local node is recommended) for the authoritative low-latency tier, and
• credentials for at least one Filecoin / IPFS pinning provider for durable deep-archive.

If neither is configured, the endpoint has nowhere durable to put cells and will reject writes rather than lose data. That refusal is intentional.

Prefer not to run storage yourself? Join SAIHM.

You have two paths, and either is fine:

1. Run your own operator endpoint and configure the storage backend as described above — full sovereignty, your infrastructure.
2. Join the hosted SAIHM operator and let it provide durable storage for you. It runs blind / non-custodial: paired with client-side sealing (see @saihm/client-pro and @saihm/mcp-server-pro), it only ever stores ciphertext and never holds your keys — so you get managed storage without giving up custody. Enrol via Join SAIHM at https://saihm.coti.global (a paid hosted service).

Reporting engine

A reporting library is bundled as a sub-export, so operators can compose the eight MCP calls into bespoke reports with their own tooling (no extra dependency, no extra service):

import {
  validateBespokeTemplate,
  registerTemplate,
  generateRegistryAttestation,
  StubPublicRegistry,
  InMemoryReportingRuntime,
  GDPR_ART15_FIELDS,
  REGISTRY_ATTESTATION_FIELDS,
  type BespokeReportTemplate,
} from "@saihm/mcp-server/reporting";

What it covers

• Field universe (FIELD_UNIVERSE) — 280 fields (262 framework + 18 ledger). Templates that project a field outside this set are rejected at validation.
• Bespoke template schema — zod validator + universe-membership check + scope/cap enforcement.
• Authorization path validators — 4 paths: public / self / operator-self / operator-for-downstream.
• Receipt emission — 6 sub-kinds (report_generated / report_rejected / template_registered / template_superseded / erasure_chain_broken / rate_limit_exceeded) under a stable, domain-separated receipt namespace.
• Framework smoke — registry-attestation (public auth) for end-to-end plumbing verification.

Constraints

• Every fieldProjections[] entry MUST be in FIELD_UNIVERSE.
• scope.customerIdHashes 64-hex; max 10,000 per template.
• scope.timeRange window ≤ 366 days.
• fieldProjections length 1–200.
• framework ∈ {gdpr-art-15, gdpr-art-17, soc2-t1, soc2-t2, iso27001, aml, audit-export, billing-history, registry-attestation}.
• format ∈ {pdfa3, json, csv}.

Worked example

const template: BespokeReportTemplate = {
  templateId: "acme-q1-summary",
  templateVersion: 1,
  operatorIdHash: "ab".repeat(32),
  scope: {
    customerIdHashes: ["cd".repeat(32)],
    timeRange: { from: "2026-01-01T00:00:00Z", to: "2026-04-01T00:00:00Z" },
  },
  framework: "gdpr-art-15",
  fieldProjections: [GDPR_ART15_FIELDS[0], GDPR_ART15_FIELDS[1]],
  format: "pdfa3",
};
const v = validateBespokeTemplate(template);
if (!v.valid) throw new Error(v.errors.join(", "));

const runtime = new InMemoryReportingRuntime(); // replace with your audit-ledger runtime
const reg = await registerTemplate(template, runtime);
if (reg.ok) console.log("registered:", reg.templateHash);

In production, replace InMemoryReportingRuntime with a runtime that persists audit payloads to your operator's audit ledger. Operators who inject signature verifiers should use pure-crypto libraries (@noble/curves for EIP-712, @noble/post-quantum for FIPS 204 ML-DSA) — the package itself bundles no EVM tooling.

Security

The server enforces a small set of defaults so misconfiguration cannot leak the Authorization header in transit:

• HTTPS-only endpoints. SAIHM_ENDPOINT_URL must use https://. Plain http:// is rejected at construction time, except for 127.0.0.1 and localhost (so a local operator endpoint works during development).
• Per-call abort window. Each request runs under an AbortController that aborts after 30s, preventing a hung endpoint from starving the MCP server.
• Response-size cap. Responses whose Content-Length exceeds 16 MB are rejected before deserialisation.
• No header echo. Authorization is never included in thrown error messages or stdout.
• No filesystem reads. The package never reads from disk; configuration flows entirely through env vars.
• Zero EVM tooling. No ethers, no eth_*, no Solidity. If operators inject signature verifiers via AuthVerifiers, they should use pure-crypto libraries (@noble/curves, @noble/post-quantum).

Trust model: this client trusts whatever endpoint the operator configures. Cell IDs, audit anchors, and report receipts returned from that endpoint are surfaced to the agent verbatim — operators are the authority for content shown via saihm_recall. Verifying receipts against COTI V2 mainnet anchors is out of scope for this server; consume the cellId and auditCellId fields and verify against your own SAIHM mainnet read path.

For distribution integrity, each release carries the npm registry signature; verify with npm audit signatures (and inspect npm view @saihm/mcp-server --json | jq .dist).

Dependencies

The published npm package has a minimal runtime surface:

Dependency	License	Role
Node.js (≥ 20.x)	MIT	Runtime
@modelcontextprotocol/sdk	MIT	MCP SDK; binds the eight-tool surface
TypeScript	Apache-2.0	Build-time only
tsx	MIT	TypeScript runner for tests + CLI

No copyleft, no proprietary dependencies. Cryptographic primitives at the operator-endpoint layer (ML-DSA-65 / Ed25519 / key derivation) are not bundled into this MCP server; operators implementing the protocol stack are recommended to use @noble/post-quantum and @noble/curves (MIT) rather than rolling custom code.

Achievements

• OpenSSF Best Practices Passing badge — project 12898, 100% Passing criteria (2026-05-19). https://www.bestpractices.dev/projects/12898
• IETF — draft-saihm-memory-protocol-01 (2026-05-27) was submitted to the Independent Submission Stream; on 2026-07-25 the ISE concluded its consideration and released it from the queue (datatracker stream now None), directing the work toward IETF working-group activity (the agentproto effort). It is not an Internet Standard, is not endorsed by the IETF, and has no formal standing in the IETF standards process. The -01 draft remains available on the datatracker as the current reference text. https://datatracker.ietf.org/doc/draft-saihm-memory-protocol/
• npm registry — @saihm/mcp-server@0.3.4 published (2026-06-22) adds a conspicuous "Storage is the operator's responsibility (by design)" section — documenting BYO storage and the Join-SAIHM hosted, non-custodial option. 0.3.3 (2026-06-22) was a documentation release that states the Independent-Submission status precisely (no implied IETF endorsement) and cross-references the companion package @saihm/client-pro. 0.3.2 (2026-06-22) corrected the documented operator-endpoint path to /mcp (the canonical SAIHM_ENDPOINT_URL path) across the README and client comments. 0.3.1 (2026-05-28) was a metadata patch that sources the MCP serverInfo.version from package.json (was hardcoded "0.1.0" from 0.1.0 through 0.3.0). 0.3.0 (also 2026-05-28) aligned the saihm_status response shape with draft-saihm-memory-protocol-01 §3.4 (full eight-field schema: prs, bfsi, bfsi_window_start_ts, bfsi_R, bfsi_M, shards, contracts, governance). 0.2.0 (also 2026-05-28) aligned the cell-tuple response shape with §2.1; 0.1.3 was the OpenSSF Best Practices Passing badge release (2026-05-19).
• MCP Registry / Glama — server listed for discovery (2026-05-16).

Roadmap

A 12-month roadmap is maintained in the project's AAIF proposal and will be mirrored to https://saihm.coti.global/roadmap with the v0.2.x release. Near-term tracks:

• 2026-Q2 — Operator-endpoint reference implementation; OpenSSF Silver pursuit (governance, code-of-conduct, DCO, signed releases, coverage tooling, assurance case).
• 2026-Q3 — First 2–3 external organization deployments; formal AAIF Project Proposal submission when adoption blockers clear.
• 2026-Q4 — NIST AI RMF crosswalk public review; EU AI Act compliance-checklist generator. OpenSSF Silver award (target).
• 2027-Q1 — Independent-stream (ISE) RFC publication, subject to RFC-Editor review — not an IETF-consensus standard; v1.0 reference implementation.

Support

SAIHM is developed and maintained by a solo founder. If it's useful to you or your organization, please consider sponsoring the project — it funds continued protocol, client, and open-standards work and keeps this open reference implementation maintained.

License

Apache-2.0 — see LICENSE.

Project

• Site: https://saihm.coti.global
• Issue tracker: https://github.com/SAIHM-Admin/saihm-mcp/issues
• Security: see SECURITY.md for private vulnerability disclosure
• Contributing: see CONTRIBUTING.md and CODE_OF_CONDUCT.md
• Governance: see GOVERNANCE.md
• Changelog: see CHANGELOG.md