Vestige

Local-first memory for AI agents that finds the cause, not just the match.

Vestige remembers your decisions, catches contradictions before they cost you, and traces a failure back to the older memory that actually caused it. One 25MB Rust binary over MCP. No cloud, no API keys, no telemetry. Your data never leaves your machine.

Consulting · Install · Why not RAG · Benchmark · Science · Tools · Dashboard · Pro · Docs

💼 Consulting & Core Infrastructure Advisory

Autonomous agents are currently bleeding enterprise budgets via prompt bloat and context window amnesia.

I take on a limited number of technical advisory retainers and consulting projects for AI developer tool startups, multi-agent frameworks, and enterprise engineering teams looking to optimize their context economics.

Core Specializations:

• Context Optimization & Filtering: Implementing local Prediction Error Gating to strip out redundant tool runtime noise and drop token overhead by 40%–60%.
• Causal Agent Memory Design: Structuring local SQLite graph architectures using Retroactive Salience Backfilling to eliminate agent amnesia during heavy, multi-file code execution.
• Air-Gapped AI Governance: Designing zero-knowledge, high-performance Rust memory scaffolding that runs entirely on local metal to protect proprietary enterprise IP.

For architectural reviews, integration advisory, or founding infrastructure roles, reach out directly at: sam@vestige.sh

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_{A labeled fixture store, a real run. The incident is fictional, seeded into a Vestige store with a seven month backdated timeline. The engine is not. A SIGSEGV on startup in an arm64 container, and the version pin set 23 days earlier that shares zero words with the failure. Similarity ranked the pin fourth. Backfill reached back, ranked it first, persisted the causal edge, and sealed the receipt. It names the suspects. It never calls the verdict. Watch the full 58 second walk, then run vestige backfill --contrast on your own store.}

Agents re-learn the same lessons: they recommend a change you already tested and rejected, re-derive a fix that was already written down, and treat every session as if the last one never happened. Vestige is the memory layer that ends that. Any MCP-capable agent (Claude Code, Claude Desktop, Codex, Cursor, and others) writes memories as you work and retrieves them later, modeled on real cognitive science: redundant memories merge, contradicted ones are flagged, unused ones fade, and when a failure hits, Vestige reaches backward to the decision that set it up.

The cause never looks like the bug. That is the whole product.

Install

You need Node.js. No Docker, no signup, no compile step (prebuilt for macOS ARM + Intel, Linux x86_64, Windows x86_64).

Android (Termux) builds from source today; see docs/INSTALL-TERMUX.md.

npm install -g vestige-mcp-server@latest

Connect it to your agent. Every MCP client understands this config:

{
  "mcpServers": {
    "vestige": { "command": "vestige-mcp" }
  }
}

Client	Setup
Claude Code	claude mcp add vestige vestige-mcp -s user
Codex	codex mcp add vestige -- vestige-mcp
Cursor / VS Code / Windsurf	docs/integrations/
Claude Desktop	docs/CONFIGURATION.md
Cline / Continue / Zed / Goose	the JSON above, in that client's MCP settings

Verify: vestige dashboard, then open http://localhost:3927/dashboard. First run downloads a 130MB embedding model and, in the background, a ~150MB reranker, once; after that Vestige is fully offline, forever. Full walkthrough: docs/GETTING-STARTED.md.

Why not just RAG?

RAG retrieves text that resembles the query. That is the right tool when the answer looks like the question, and the wrong tool when the cause of a problem looks nothing like the symptom: a config choice from three weeks ago, a library pin, an assumption nobody flagged as risky.

	Vector search	Vestige
Retrieval basis	Similarity to the query	Causal + temporal links, plus similarity
Root cause of a failure	Cannot; the cause does not resemble the bug	vestige backfill --contrast reaches backward to it
Contradictions	Both stored, both returned	Detected and flagged (claim_contradicts_memory)
Redundant writes	Accumulate	Merged on write (prediction-error gating)
Unused memories	Persist at full weight	Fade (FSRS-6 spaced repetition)
Your data	Usually a cloud service	Never leaves your machine

The backward reach implements Retroactive Salience Backfill (Zaki, Cai et al., Nature 2024, 637:145-155, DOI 10.1038/s41586-024-08168-4): when a memory turns out to matter, the salience of the earlier memories that led to it is raised, so the causal chain becomes retrievable even though the surface text never matched. Every backfill result ships with a receipt naming the exact evidence path; Vestige reports receipt-backed candidate causes, never an unverifiable verdict.

And the limitation on the left column is not marketing: DeepMind proved single-vector retrieval mathematically incapable of certain relevance patterns (arXiv:2508.21038, ICLR 2026).

The receipts: Silent Rotation

The claim is testable, and the test ships with all 246 agent transcripts it produced. Three coding agents fix one failing e2e test; the fix needs the currently live signing key id, randomized per trial from a 50-key keyring, present in no file the agents can read. It exists only in the memory layer. The dangerous outcome is converging on a planted decoy: tests pass, the merge is clean, production breaks.

Arm (6 models, 25 trials)	Converged correct	Converged wrong	Split
No memory	0/25	21/25	4/25
Dense cosine RAG	4/23	12/23	7/23
Vestige	20/23	0/23	3/23

On the verbatim queries the agents typed, the causal memory ranks 7th of 8 under both dense cosine and BM25 while the decoy ranks 1st. Reproduce the central measurement in two seconds, stdlib only:

git clone -b benchmark/silent-rotation --depth 1 https://github.com/samvallad33/vestige.git
cd vestige/benchmarks/silent-rotation
python3 tests/bm25_baseline.py results/runA-trial-1/corpus-export.json --no-dense

The caveats are published alongside the results, including the trials a plain cosine baseline ties and the trial Vestige loses.

The science

Every mechanism is a cited result, implemented in Rust, running locally. Full write-up: docs/SCIENCE.md.

Mechanism	What it does	Source
Prediction-Error Gating	Stores only the novel; merges redundant, flags contradictory	Hippocampal novelty gating
FSRS-6 spaced repetition	Used memories persist, unused ones fade	Modern spaced-repetition research
Retroactive Salience Backfill	Reaches backward to a failure's root-cause memory	Zaki, Cai et al. 2024, Nature
Synaptic Tagging	Marks memories for later consolidation	Frey & Morris 1997
Spreading Activation	One retrieval activates related memories through the graph	Collins & Loftus 1975
Dual-Strength	Storage strength vs retrieval strength, tracked separately	Bjork & Bjork 1992
Memory Dreaming	Sleep-like replay and synthesis	Sleep consolidation research
Active Forgetting	Reversible top-down suppression, cascading to neighbors	Anderson 2025, Davis 2020

The 14 tools

Your agent calls these; you rarely do.

Tool	Purpose
recall	Retrieve memories relevant to the current context
smart_ingest	Store a fact, gated for novelty and contradiction
backfill	Reach backward from a failure to its candidate cause
receipt	Inspect retrieval receipts and evidence replay (guide)
memory · graph · intention	Inspect, promote, explore, track goals
maintain · dedup · suppress	Consolidation, merge, reversible forgetting
memory_status · codebase · source_sync · session_start	Health, code index, connectors, session priming

Project scoping, hygiene workflows, and making memory a standing habit for your agent: docs/MEMORY_HYGIENE.md · docs/AGENT-MEMORY-PROTOCOL.md · docs/CLAUDE-SETUP.md.

The dashboard

vestige dashboard

A living WebGPU observatory of your memory at http://localhost:3927/dashboard: memories appear, link, strengthen, and fade in real time, 1000+ nodes at 60fps. It renders a deterministic 12-second loop of your store's life that you can export as an mp4 with one click, and mints a brain print, a signature seeded from your store's shape. Share artifacts are structure-only by design: your brain, never your memories.

Vestige Pro

Everything above is free forever and never metered. Pro ($19/month) is managed, end-to-end encrypted continuity: your memory graph and accountability history (receipts, traces, memory PRs) following you across machines. XChaCha20-Poly1305 applied on your device, Argon2id over a passphrase only you know, ciphertext-only server. Zero-knowledge is the design: lose the passphrase and the data is unrecoverable, by anyone. Checkout opens shortly; watch Releases for the announcement.

Under the hood

Engine	Rust 2024, ~145k lines, single 25MB binary, 2,000+ tests, clippy clean at -D warnings
Retrieval	Nomic Embed v1.5 (Matryoshka 768d→256d) + USearch HNSW + SQLite FTS5, optional Qwen3 reranker
Storage	SQLite, optional SQLCipher encryption (docs/STORAGE.md)
Offline	Two model downloads on first run (130MB embedder, ~150MB reranker), then no network, ever

Go deeper

Getting Started · FAQ · The Science · Configuration · Storage · Silent Rotation · Changelog

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If Vestige saves you from one repeated mistake, that is the whole point: never solve the same problem twice. If it earns a place in your setup, a star genuinely helps.

Built by Sam. Licensed under AGPL-3.0.