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Opt in to lockfile-hash substrate attribution

The default substrate fingerprint AEGIS stamps on every row covers <provider>:<model>. Setting the X-Mnemom-Lockfile-Hash header (and, optionally, the companion X-Mnemom-Sdk-Version header) extends the fingerprint to a four-component identifier that includes a hash of your deployed dependency graph — making AEGIS able to attribute behavioral deviation to a specific deployed version of your stack, not just the model and SDK level. This guide is the runnable how-to. The conceptual surface is substrate fingerprint; the spec for the L1 read is /specifications/threat-state-response-schema.

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What you’ll change

You will:
  1. Compute a stable SHA-256 digest of your resolved package manifest at deploy time.
  2. Set X-Mnemom-Lockfile-Hash: <hex> on every outbound request from your agent to the Mnemom gateway.
  3. (Optionally) set X-Mnemom-Sdk-Version: <package>@<version> to tighten SDK attribution past the gateway’s User-Agent fallback.
  4. Verify the substrate is recorded as the four-component form via the integrity-checkpoint read path.
The two headers compose into the substrate_id stamped on every integrity_checkpoints row per the production trigger (migration 252). The four collapse forms are documented at Substrate fingerprint — the four collapse forms.

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Step 1 — Compute the digest

The hash is SHA-256, 64 hex chars, lowercase canonical on the wire (mixed case is accepted and normalized; malformed input is rejected at the gateway with 400 and X-Mnemom-Error: invalid-lockfile-hash). Compute the digest over whatever stable serialization of your resolved manifest best represents the deployed dependency graph. For most ecosystems the lockfile-on-disk bytes are the natural input. 
# Most lockfile types: hash the file bytes as-shipped.
LOCKFILE_HASH=$(sha256sum pnpm-lock.yaml | awk '{print $1}')
echo "$LOCKFILE_HASH"
# → e.g. 9e8a4f3c2b1d0e7a6b5c4d3e2f1a0b9c8d7e6f5a4b3c2d1e0f9a8b7c6d5e4f3a
Compute the digest at deploy time (CI / image build) and inject it into the agent’s runtime environment as MNEMOM_LOCKFILE_HASH. Recomputing at every request adds I/O without changing the value between deploys.

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Step 2 — Set the headers on outbound requests

Both headers travel with the request to the Mnemom gateway. Workers handles header names case-insensitively; the casing below matches the gateway’s LOCKFILE_HASH_HEADER and SDK_VERSION_HEADER constants in mnemom-platform/gateway/src/substrate-fingerprint.ts. 
curl -sS \
  -H "X-Mnemom-Api-Key: $MNEMOM_API_KEY" \
  -H "X-Mnemom-Sdk-Version: @anthropic-ai/[email protected]" \
  -H "X-Mnemom-Lockfile-Hash: $LOCKFILE_HASH" \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"model":"claude-sonnet-4-6","messages":[...]}' \
  https://gateway.mnemom.ai/anthropic/v1/messages
The two headers are independent opt-ins. Setting only the lockfile-hash header produces a 4-component fingerprint with an empty SDK slot (<provider>:<model>::<lockfile-hash>); setting only the SDK header produces a 3-component fingerprint (<provider>:<model>:<sdk@ver>); setting both produces the full 4-component form.

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What X-Mnemom-Sdk-Version adds

The SDK version is sourced from three places, in order:
  1. The X-Mnemom-Sdk-Version header value, if present (this is the preferred path).
  2. A User-Agent dispatch over seven known SDK families (@anthropic-ai/sdk, OpenAI Python, Anthropic Python, etc.), if the request’s User-Agent matches one.
  3. null (collapsing to the 3- or 2-component fingerprint form).
Setting X-Mnemom-Sdk-Version explicitly is the way to get reliable SDK attribution when you’re sending requests from custom or non-canonical clients.

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Step 3 — What gets stored

AttributeWhat the gateway records
HashStored verbatim in integrity_checkpoints.substrate_id as the fourth component.
Manifest contentsNever sent, never stored. Only the hash crosses the wire.
ValidationMalformed (not 64 hex chars after normalization) → 400 + X-Mnemom-Error: invalid-lockfile-hash; request rejected before reaching the agent.
Lookup directionsubstrate_id is the cross-tenant axis identity AEGIS aggregates on. The cross-tenant aggregator buckets per (substrate, vertical, pattern, source); your hash contributes to the substrate axis bucket for your specific deployed graph.

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Privacy posture

The hash is a deterministic function of your lockfile contents. Reversing it to recover the lockfile requires brute-forcing the lockfile-content space, which is computationally infeasible for non-trivial lockfiles. For very small / trivial lockfiles (e.g., a single pinned dependency) the hash is in principle reversible to that content; if that matters for your threat model, do not opt in.

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Step 4 — Verify the substrate is being recorded

The canonical record is on integrity_checkpoints.substrate_id, readable via the customer-facing checkpoints endpoint: 
curl -sS \
  -H "X-Mnemom-Api-Key: $MNEMOM_API_KEY" \
  "https://api.mnemom.ai/v1/agents/$AGENT_ID/checkpoints?limit=1" \
  | jq '.[0].substrate_id'
After issuing one request with both headers set, the latest checkpoint’s substrate_id should be the four-component form, for example: 
"anthropic:claude-sonnet-4-6:@anthropic-ai/[email protected]:9e8a4f3c2b1d0e7a6b5c4d3e2f1a0b9c8d7e6f5a4b3c2d1e0f9a8b7c6d5e4f3a"
There is no dedicated self-test endpoint — the checkpoint read is the verification path.

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When to use this

ScenarioRecommendation
You want substrate attribution at the deployed-dependency-graph level — AEGIS can flag your deployed stack independently of other customers running on the same <provider>:<model>:<sdk@ver>.Opt in.
You only want SDK-level attribution and the User-Agent dispatch handles your client.Skip. The default <provider>:<model> plus User-Agent-derived <sdk@ver> is sufficient.
Your deployment is a single canonical image (lockfile is identical across the fleet).Opt in. The hash is stable across the fleet and contributes coherent signal.
Your lockfile changes on every deploy (lockfile churn).Opt in only if you can tolerate the L1 bucket fragmenting per deploy. The substrate axis is most useful when the bucket is stable.
Your lockfile is trivial enough that the hash is reversible.Skip if the reversal matters for your threat model.
The lockfile-hash dimension is the runtime-side companion to package-layer provenance — see Supply-chain trust for how AEGIS substrate attribution and SLSA / Sigstore compose.

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See also