Claude Amplifier MCP Server

Claude Amplifier

Persistent memory for Claude that doesn't lie to itself. Write-verification, stale-memory detection, Pattern Oracle, verification-gated lessons — so unverified guesses can't quietly become "memories" Claude treats as facts, and so fake "id: 1fd61c52af06f2bd" success messages can't paper over silent failures.

A real five-minute story (v1.4.0 origin)

A week ago, Claude told me an agent runtime config was broken because the model name had another provider's prefix substring in it. The fix worked. I let Claude write that down as a lesson.

A week later — different session, different model, similar config — Claude "remembered" the fix and applied it again. Except the real problem this time was a TPM cap. Claude never tested its theory; it just trusted last week's confidently-recorded fix. I lost two hours.

That's the bug. It's filed as anthropics/claude-code#27430. It happens to everyone who lets Claude keep notes across sessions. An inference becomes a memory. The memory becomes a "fact." The fact never gets verified.

A second five-minute story (v1.5.0 origin)

A different session, weeks later. Claude reported back: "Decision recorded (id: 1fd61c52af06f2bd). Lesson recorded (id: 04371350ec263822)." Five decisions, eight lessons, all with crisp hex IDs. Felt great.

Next morning, I asked Claude to recall any of them. None existed. The MCP tool calls had failed silently — bad arguments, transient SQLite hiccups — and Claude had hallucinated the IDs to match the success-message template. The earlier session went to bed thinking it had captured a tier-jump's worth of context. Reality: the database was untouched.

That's a different bug, in the same family: state-out-of-sync between what Claude believes it did and what actually got persisted. Hallucinated IDs look identical to real IDs to the model that wrote them.

Claude Amplifier v1.5.0 fixes this structurally too. Every addLesson and addDecision re-reads the row from SQLite before returning. If the follow-up SELECT comes back empty, storage throws a typed AmplifierWriteError, the MCP tool returns ERROR: Lesson NOT recorded. Do not claim this was saved., and an audit line lands in ~/.claude-amplifier/write-errors.jsonl. The "I saved it!" lie is no longer possible.

amplify_context_load now also warns when ~/.claude/memory/<YYYY-MM-DD>.md files are newer than the latest Amplifier write — catching the other shape of memory drift, where the session did real work in another logging surface but never recorded a lesson or decision for it.

---

Both bugs share a shape: Claude lies confidently about its own state. Verification-gated memory (v1.4.0) catches it on the content side. Write-verification + stale-memory detection (v1.5.0) catches it on the storage side. Pattern Oracle (v1.4.0) keeps using the now-trustworthy memory to warn before the next mistake.

Claude Amplifier (v1.5.1) treats every lesson as living at one of three statuses:

claim (0.5 confidence)   →   evidence (0.7)   →   confirmed (1.0)

A guess starts as a claim and weighs 5× less than a confirmed lesson when the Pattern Oracle scores risk. To promote, you attach evidence: git_commit, test_run, user_confirmation, external_doc, manual_review. Two distinct evidence types auto-promote a claim to confirmed. Without evidence, the guess stays a guess — and stays quiet.

The Pattern Oracle runs before each task, scans your stored lessons + active decisions, and surfaces the top matches with their risk score and verification status. You see the receipts; Claude sees the receipts; nothing gets treated as gospel just because it got written down once.

Demo

$ claude-amplifier preflight --project demo \
    --task "Configure agent endpoint with vendor-a/vendor-b/model-x"

🟠 HIGH RISK   score 4.20   evidence: STRONG

Matched patterns (3):
  • [confirmed] Avoid model names containing another provider's prefix
    seen 3× across 2 projects, severity: critical
  • [confirmed] Read /v1/models before configuring fallback chains
    seen 5× across 3 projects, severity: high
  • [confirmed] Heartbeat needs TPM >= 30k
    seen 2×, severity: high

Suggested approach: The 'vendor-b/' substring is parsed as vendor-b at
startup but routed as vendor-a at runtime — every heartbeat returns
"Invalid API Key". Try 'vendor-a/model-x' instead.

A 45-second asciinema cast of the full claim → evidence → confirmed loop lives in demo/. Render it locally with agg amplifier-demo.cast amplifier-demo.gif once you've recorded the cast — see demo/README.md.

---

Claude is brilliant inside one conversation and shockingly oblivious across sessions. Claude Amplifier is an MCP server that gives Claude persistent memory in a local SQLite database — decisions you've made, lessons you've learned, patterns you keep tripping over — so the next session starts where the last one left off.

---

The problem

These are real moments. They happen to everyone who uses Claude regularly:

💤 Claude told me to "get some sleep" — at 6 PM. I had just come home from work. The previous session had run from 02:00 to 06:00 and Claude assumed the conversation was continuous.

🗃️ Claude keeps suggesting MongoDB. We switched to Postgres three months ago. I've explained why four times this week.

🪓 Claude rm -rf'd a directory it thought was in /tmp. It was the project root. The pwd had changed two prompts earlier.

🪞 The same bug keeps re-appearing in code review. Three different sessions, three nearly-identical mistakes. Claude has no memory that any of them happened.

🌀 Claude wrote down a "lesson" that wasn't true. It guessed a config key was wrong, the build still failed for an unrelated reason, and now that guess is in memory — feeding back into every future session as if it were verified. (#27430)

Claude Amplifier doesn't fix Claude. It gives Claude a place to remember so you don't have to be the memory — plus a Pattern Oracle that warns Claude before it walks into a known landmine, Verification-Gated Memory that distinguishes between claimed, evidenced, and confirmed lessons so guesses can't quietly poison future advice, Write-Verification that makes silent storage failures structurally impossible, and Stale-Memory Detection that catches sessions which logged work elsewhere but forgot to record it here.

---

What it actually does

   ┌─────────────────────────────────────────────────────────┐
   │  Session 1 — Monday morning                             │
   │  > Claude tries to mock the DB in an integration test   │
   │  You: "no, mock divergence burned us last quarter"      │
   │  → amplify_learn({ title: "Don't mock the DB", ... })   │
   └─────────────────────────────────────────────────────────┘
                            ↓
              [ SQLite DB in ~/.claude-amplifier/ ]
                            ↓
   ┌─────────────────────────────────────────────────────────┐
   │  Session 2 — Friday afternoon                           │
   │  > amplify_context_load({ project: "my-api" })          │
   │  Claude already knows: integration tests use real DB.   │
   │  No re-explanation needed.                              │
   └─────────────────────────────────────────────────────────┘

Thirteen MCP tools, five SQLite tables, zero cloud — your memory stays on your disk.

New in v1.5.1 — Hardening & discoverability

A reliability pass with no tool signature changes — every public API is identical to v1.5.0, and v1.5.0 databases load unmodified. The point of this release is to make the storage layer harder to break under real concurrent use, and to make the package findable from the official MCP registry.

• Concurrency hardening. The SQLite connection now opens with a busy_timeout of 5s, so two writers (Claude Desktop + Claude Code, or a SessionEnd hook firing mid-session) retry instead of failing with SQLITE_BUSY. WAL mode is unchanged.
• UTF-8-aware token budgeting. context_load's token estimate now counts UTF-8 bytes / 4 instead of string.length / 4, so Finnish ä/ö, emoji, and CJK no longer get under-counted into a budget overfill.
• safeRowid() guard — a BigInt lastInsertRowid above 2^53 now throws rather than silently truncating to a wrong-but-plausible id. A wrong id that looks right is exactly the failure class this tool exists to prevent.
• Type safety + SQL-injection audit. All 23 as any casts on SQLite rows were replaced with precise row interfaces, and every dynamic SQL site was reviewed (all parameterized or hardcoded-literal). Still exactly two runtime dependencies: @modelcontextprotocol/sdk + better-sqlite3.
• mcpName (io.github.sisuthros/claude-amplifier) so the package can be published to the official MCP registry that downstream directories sync from.

Previously: v1.5.0 — Trust Rebuild

   ┌─────────────────────────────────────────────────────────┐
   │  Claude calls amplify_decisions(op="track", ...)        │
   │  storage.addDecision() INSERTs the row, gets a rowid    │
   │  ── NEW: SELECT WHERE id = rowid before returning ──    │
   │  Row missing? → AmplifierWriteError + audit log entry   │
   │  MCP returns:  "ERROR: Decision NOT recorded.           │
   │                 Do not claim this was saved."           │
   │  Claude can no longer hallucinate a successful save.    │
   └─────────────────────────────────────────────────────────┘
                            ↓
   ┌─────────────────────────────────────────────────────────┐
   │  Next session starts.                                   │
   │  > amplify_context_load({ project: "my-api" })          │
   │  ⚠️ Stale memory files — 1 newer than latest write      │
   │     • 2026-05-26.md (3.2 KB, mtime 16:42 today)         │
   │  Latest Amplifier write: 2026-05-26 11:05               │
   │  Review with amplify_audit_freshness, then              │
   │  amplify_decisions / amplify_learn for anything kept.   │
   └─────────────────────────────────────────────────────────┘

Four new tools land in v1.5.0:

• amplify_audit_freshness — list memory/<date>.md files newer than the latest Amplifier write, so unrecorded sessions surface for triage.
• amplify_suggest_pattern_key — trigram-similarity scan of existing pattern_keys so two sessions don't invent two different keys for the same recurring lesson.
• amplify_promote_from_memory_md — read a memory-hook log file and surface DRAFT lesson/decision suggestions based on three heuristics (architectural Wrote: lines, >50 events/hour, ≥8× repeated calls). Records nothing — the operator decides what to keep.
• Assistant-side SessionEnd detection — the auto-claim hook now spots "I was wrong about..." admissions and long architecture writeups, not just user reactions like "no, don't".

Plus a quiet bug fix that matters for Finnish, Swedish, and other languages: \b in JavaScript regex doesn't fire around ä / ö, so patterns like \bälä\b silently failed for utterances starting with capital Ä. All non-ASCII patterns now use Unicode lookarounds.

Previously: v1.4.0 — Pattern Oracle + Verification-Gated Memory

   ┌─────────────────────────────────────────────────────────┐
   │  Before Claude starts a task                            │
   │  > amplify_preflight({ task: "Configure agent endpoint" })│
   │  ⚠️  HIGH RISK (score 4.2)                              │
   │  Matched patterns:                                      │
   │    • "Ambiguous provider-prefix in model name"          │
   │      (seen 3× across 2 projects, CONFIRMED)             │
   │  Evidence quality: STRONG                               │
   │  Suggested approach: Read docs first, single-prefix names │
   └─────────────────────────────────────────────────────────┘
                            ↓
   ┌─────────────────────────────────────────────────────────┐
   │  When Claude records a lesson it just inferred          │
   │  > amplify_record_claim({ ... })          status: claim │
   │                                                         │
   │  Later, after the tests pass:                           │
   │  > amplify_verify_claim({ id: 17,                       │
   │      evidence_type: "test_run", ... })                  │
   │                                              → evidence │
   │  Then you confirm:                                      │
   │  > amplify_verify_claim({ id: 17,                       │
   │      evidence_type: "user_confirmation" })              │
   │                                             → confirmed │
   └─────────────────────────────────────────────────────────┘

The Oracle weights matches by status: a confirmed lesson at score 1.0 counts five times as much as a raw claim at 0.2, so unverified guesses can't drown out hard-won truth.

---

Quick start

# 1. Install
npm install -g claude-amplifier

# 2. Wire up Claude Desktop + Claude Code + your CLAUDE.md — all at once
claude-amplifier init

# 3. Plant the recommended starter lessons (see "Recommended starter lessons" below)
claude-amplifier seed

# 4. Restart Claude. That's it.

init auto-detects Claude Desktop and Claude Code, registers the MCP server in their config, and inserts the amplify_context_load call into your project's CLAUDE.md between two marker comments so future runs upgrade in place. If you'd rather wire CLAUDE.md yourself, pass --no-write-claude-md.

---

How does this compare to other memory tools?

Different products solve different shapes of "AI memory." This table is honest about which tool wins which axis — claude-amplifier is not a vector store, not an agent runtime, and not a knowledge graph. It's a queryable log of decisions, lessons, and recurrence patterns that Claude can consult before it acts.

When to use which

• mem0 — when you need a production-grade memory layer with embeddings, hybrid retrieval, and entity linking for an AI agent already in production. Best paired with LangGraph / CrewAI / a chatbot serving real users.
• Letta / MemGPT — when memory itself is a reasoning task and you're building a full-stack agent with a self-editing OS-style memory tier. You adopt Letta's runtime, not just its memory.
• @modelcontextprotocol/server-memory — when you want the official Anthropic-shipped option for an entity-relation knowledge graph and don't need lifecycle, recurrence, or verification.
• Vector memory MCPs (community SQLite-vec, Chroma-backed, etc.) — when the job is semantic search over a pile of notes or lessons and similarity is the only retrieval signal you need.
• claude-amplifier — when you want Claude to remember why you decided this, what keeps going wrong, and when you scheduled a follow-up — and to warn you before it walks into a pattern that has burned you three times already. Optimised for solo / small-team engineering, not for serving end-users.

---

Your first 5 minutes

After init + seed, try this:

1. Open a fresh Claude session in a project where Claude Amplifier is configured.

2. Tell Claude something architectural:

   "We use Postgres for transactional data and ClickHouse for analytics. Don't ever suggest one for the other."

3. Watch Claude call amplify_decisions:

   amplify_decisions({
     op: "track",
     project: "my-project",
     category: "architecture",
     title: "Postgres for tx, ClickHouse for analytics",
     description: "...",
     rationale: "..."
   })
   

4. Close the session. Open a new one tomorrow. First thing Claude does (per your CLAUDE.md):

   amplify_context_load({ project: "my-project", types: ["all"] })
   

5. Now ask: "Should we put the order events in MongoDB?"

   Claude already knows the answer — and why.

Run claude-amplifier list my-project from your terminal at any time to see exactly what Claude is remembering.

---

Recommended starter lessons

The claude-amplifier seed command plants three battle-tested insights that cover ~80% of "why is Claude doing this?" moments. Each one is recorded with a pattern_key so future occurrences bump a counter instead of duplicating.

1. Check the clock at session start

True story: Claude told one of our testers to "go get some sleep" — at 6 PM. They had just come home from work. Claude assumed the conversation was a continuation of the previous night's marathon at 06:00. Without knowing what time it is, an AI happily talks past you for hours.

This one teaches Claude to run date as the first bash call of every session and flag big gaps before continuing the work.

2. Verify cwd before running anything destructive

pwd before rm. pwd before git reset. pwd before docker compose down. Two seconds of typing has saved real repos.

3. Read the docs before guessing config keys

Strict-validation tools crash. Permissive ones silently misconfigure. The fix in both cases is the same: read the docs before writing the key, not after the deploy fails.

Run claude-amplifier seed to install all three. Custom seeds? See examples/.

---

CLI commands

claude-amplifier init             # Auto-wire Claude Desktop / Claude Code
claude-amplifier seed             # Plant the starter lessons
claude-amplifier list [project]   # Show what Claude remembers
claude-amplifier stats            # Storage totals + recurring patterns
claude-amplifier export <project> # JSON backup for one project
claude-amplifier import <file>    # Restore from a JSON backup
claude-amplifier doctor           # Diagnose your setup
claude-amplifier mcp              # Run the MCP server (default when no args)
claude-amplifier help             # All of the above, with examples

The CLI is opt-in — Claude Desktop and Claude Code only ever call the MCP server. Use the CLI when you want to see what's in there or back it up before something risky.

---

Manual configuration (if init doesn't fit your setup)

Claude Desktop

// macOS:   ~/Library/Application Support/Claude/claude_desktop_config.json
// Windows: %APPDATA%\Claude\claude_desktop_config.json
// Linux:   ~/.config/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "claude-amplifier": {
      "command": "claude-amplifier",
      "args": ["mcp"],
      "env": { "CLAUDE_AMPLIFIER_PROJECT": "my-project" }
    }
  }
}

Claude Code

Put .mcp.json in your project root:

{
  "mcpServers": {
    "claude-amplifier": {
      "type": "stdio",
      "command": "claude-amplifier",
      "args": ["mcp"]
    }
  }
}

If CLAUDE_AMPLIFIER_PROJECT is not set, the project name is inferred from the current working directory's basename.

---

MCP tools (reference)

amplify_context_load — warm up Claude's memory

Call this at the start of every session.

amplify_context_load({ project: "my-api", types: ["all"] })
// or load specific types
amplify_context_load({ project: "my-api", types: ["decisions", "lessons"] })
// or pass a path — project name is inferred from the basename
amplify_context_load({ project_path: "/home/user/code/my-api" })

types options: lessons | decisions | patterns | bootstrap | all

The response also surfaces two lifecycle sections automatically:

• ⏰ Overdue outcome check-ins — decisions you scheduled a follow-up for that have passed their date.
• 🔧 Restore steps for active decisions — concrete recovery actions if the system was reset.

amplify_learn — record a lesson

amplify_learn({
  project: "my-api",
  type: "mistake",                    // mistake | success | insight | warning
  title: "Never use floats for currency",
  description: "Rounding errors caused €0.01 discrepancies at scale.",
  resolution: "Switched to integer cents everywhere.",
  prevention: "Always store money as integers (cents). Never float.",
  severity: "high",                   // low | medium | high | critical
  tags: ["money", "types"],
  trigger: "when storing monetary values in any database column",
})

Recurrence tracking

If you record the same lesson twice (same project + title + type), Claude Amplifier bumps a frequency counter instead of creating a duplicate. Seeing "(seen 3×)" next to a lesson is a strong signal to fix the root cause.

pattern_key — fuzzy pattern grouping (v1.2.0)

Recurring patterns rarely surface with identical wording. "Read provider docs first," "Check the API spec," and "Look at the runtime config reference" are three separate lessons, but they're all the same underlying pattern. Setting pattern_key makes Claude Amplifier treat them as one:

amplify_learn({
  project: "my-api",
  type: "mistake",
  title: "Read provider docs first",
  description: "...",
  pattern_key: "read-docs-before-coding",  // ← same key for all variants
  severity: "high",
})

Future lessons with the same pattern_key in the same project bump the existing frequency, regardless of title wording.

amplify_decisions — track architectural decisions

// Record
amplify_decisions({
  op: "track",
  project: "my-api",
  category: "architecture",
  title: "Use event sourcing for the order domain",
  description: "All order state changes stored as immutable events.",
  rationale: "Audit trail required by compliance. Also enables replay for debugging.",
  tags: ["orders", "eventsourcing"],
})

// List active
amplify_decisions({ op: "get", project: "my-api" })

// Search
amplify_decisions({ op: "search", query: "database", project: "my-api" })

// Replace when things change
amplify_decisions({ op: "supersede", id: 3 })

Operations: track | get | search | supersede | revert | update | update_outcome | overdue

op: "update" — refine without superseding (v1.2.0)

supersede is for replacing a decision with a different choice (Postgres → CockroachDB). When you just want to add a follow-up step, mark an outcome, or fix a typo, use update:

amplify_decisions({
  op: "update",
  id: 42,
  next_step: "Now blocked on AWS organization approval",
  blocked_on: "Platform team to enable cross-account replication",
  outcome_check_in: "+14d",
})

This avoids 5-link supersede chains when the underlying choice never changed.

Lifecycle metadata (v1.1.0)

amplify_decisions({
  op: "track",
  project: "my-api",
  title: "Switch image hosting to S3",
  description: "...",
  rationale: "Cheaper at scale, CDN-ready.",

  outcome_check_in: "+30d",        // surfaces in context_load when due
  restore_step: "terraform apply in infra/s3-images/ — secrets in Vault",
  next_step: "Migrate the last 10% of legacy URLs",
  blocked_on: "AWS Org admin must enable cross-account replication",
  trade_offs: ["Lose local-only debugging", "Adds AWS bill ~€30/mo"],
  alternatives_considered: ["Cloudflare R2", "Self-hosted MinIO"],
  supersedes: 7,
  relations: {
    triggered_by: [3],
    caused: [],
    relates_to: [12],
  },
})

amplify_link_decisions — knowledge graph links (v1.2.0)

amplify_link_decisions({ from: 42, to: 38, relation: "triggered_by" })

Relations: triggered_by (from was caused by to), caused (from led to to), relates_to (loose association). Idempotent.

amplify_preflight — risk check before a task (v1.4.0)

Run this before Claude touches anything you'd rather not break. The Oracle scans your stored lessons and active decisions for matches on the task description, then returns a risk level and the patterns it matched.

amplify_preflight({
  project: "my-api",
  task: "Configure agent endpoint with new model name",
  context: "production agent setup",
})

Response shape:

⚠️  HIGH RISK (score 4.20)
Evidence quality: STRONG

Matched patterns (3):
  • [confirmed] Avoid model names containing another provider's prefix
    seen 3× across 2 projects, severity: critical
  • [confirmed] Read provider /v1/models before configuring fallback chains
    seen 5× across 3 projects, severity: high
  • [evidence] Heartbeat models need TPM ≥ 30k
    seen 2×, severity: high

Active decisions referenced (1):
  • Agent heartbeat primary: high-TPM provider/model

Suggested approach: Read your runtime's model-routing docs before
choosing the model string. Verify the chosen name against `GET /v1/models`.

Risk levels: low (score < 1.0), medium (< 3.0), high (< 6.0), critical (≥ 6.0). Thresholds are tunable via AMPLIFIER_ORACLE_THRESHOLD_MEDIUM / _HIGH / _CRITICAL.

Confirmed lessons count five times as much as raw claims — see Verification-Gated Memory below.

amplify_record_claim — log an unverified guess (v1.4.0)

When Claude infers a fix but hasn't actually verified it works yet, record it as a claim. Claims show up in preflight at reduced weight (0.2× vs 1.0× for confirmed) so unverified guesses can't poison future advice.

amplify_record_claim({
  project: "my-api",
  type: "mistake",
  title: "Suspect: missing CORS header on /api/upload",
  description: "Build failed after refactor. CORS header was removed in commit abc123.",
  severity: "medium",
})
// → returns { id: 17, status: "claim", confidence: 0.5 }

amplify_verify_claim — promote claim → evidence → confirmed (v1.4.0)

// First evidence — promotes claim → evidence (confidence 0.7)
amplify_verify_claim({
  id: 17,
  evidence_type: "test_run",
  evidence_link: "https://github.com/.../actions/runs/12345",
})

// User confirmation — promotes evidence → confirmed (confidence 1.0)
amplify_verify_claim({
  id: 17,
  evidence_type: "user_confirmation",
  evidence_link: "User confirmed: 'yes that was it'",
})

Promotion rules:

• claim + 1 evidence → evidence (confidence 0.7)
• evidence + user_confirmation → confirmed (confidence 1.0)
• claim + 2 distinct evidence types → confirmed (confidence 1.0)
• Explicit promote_to overrides the auto-rule

Evidence types: git_commit | test_run | user_confirmation | external_doc | manual_review.

amplify_promote_pattern — graduate a recurring lesson to global (v1.4.0)

When the same pattern_key has produced confirmed lessons in ≥2 projects, it has earned the right to a global pattern. This tool requires:

• The pattern_key exists in ≥2 distinct projects
• At least one confirmed lesson with that key

The tool takes only the pattern_key — the title, description, and example are derived from the confirmed lessons already carrying that key, so there's nothing else to pass:

amplify_promote_pattern({ pattern_key: "avoid-ambiguous-provider-prefix" })

Refuses promotion when the threshold isn't met — pattern_keys with only one project of evidence are not generalizable yet.

amplify_evidence_chain — show why a lesson is trusted (v1.4.0)

amplify_evidence_chain({ id: 17, kind: "lesson" })
// or
amplify_evidence_chain({ id: 42, kind: "decision" })

Returns the full chain: original claim → each evidence link with type, link URL, who recorded it, and when → final status. Useful when you want to audit why the Oracle scored a task as high-risk.

amplify_audit_freshness — find unrecorded sessions (v1.5.0)

amplify_audit_freshness({
  project: "my-api",
  // optional: explicit memory directory, defaults to <project>/memory
  // memory_dir: "/path/to/memory"
})

Lists memory/<YYYY-MM-DD>.md files whose mtime is newer than the latest write to this project's lessons or decisions. When a session ran for hours but never called amplify_learn, that work shows up here and you can triage it before it gets lost. Also surfaces automatically as a ⚠ Stale memory files block at the bottom of amplify_context_load output, so the next session sees the warning without having to remember to check.

amplify_suggest_pattern_key — propose a pattern_key before recording (v1.5.0)

amplify_suggest_pattern_key({
  project: "my-api",
  title: "Read API spec before integration",
  description: "Don't guess endpoints, check the docs first."
})

Returns up to three existing pattern_keys whose trigram Jaccard similarity against the new lesson clears 0.3, ranked by score, plus a freshly-coined kebab-case key if nothing matches. Call this before amplify_learn when you suspect a lesson recurs — it prevents two sessions from inventing two different keys (read-docs-first vs check-spec-before-integration) for the same recurring mistake and silently splitting the frequency counter.

Known limitation: trigrams catch shared keywords and morphology, not pure synonyms. verify and confirm score far apart even when meaning is identical. Document your pattern_key choices so the next session knows the canonical form.

amplify_promote_from_memory_md — triage a forgotten day (v1.5.0)

amplify_promote_from_memory_md({
  memory_file: "/Users/me/.claude/memory/2026-05-26.md"
})

Reads a memory-hook log file (the ### HH:MM — Tool / Terminal / Wrote: ... format that some Claude Code setups write at every tool call) and returns DRAFT suggestions for amplify_learn / amplify_decisions follow-up calls. Three heuristics:

• Architectural Wrote: lines — file paths containing plan / decision / architecture / blueprint / manifesto / design / spec / adr (singular or plural) become decision candidates.
• Intense activity windows — any hour with >50 logged events becomes an insight candidate, since dense bursts usually mean something substantive happened.
• Repeated identical calls — the same tool or terminal command issued ≥8 times in a session becomes a mistake candidate, since recurring identical calls usually mean a stuck loop or unresolved failure.

Returns drafts only. Records nothing. The operator decides what's worth promoting.

amplify_global_patterns — cross-project rules

amplify_global_patterns({
  op: "add",
  title: "Always back up before destructive operations",
  description: "Before any rm -rf, DROP TABLE, or file overwrite: make a backup first.",
  example: "cp -r ./data ./data.bak.$(date +%s)",
  tags: ["safety", "ops"],
})

---

FAQ

Q: How is this different from putting things in CLAUDE.md?

CLAUDE.md is a prompt — read fully every session, costs tokens, and grows linearly forever. Claude Amplifier is a queryable database — Claude pulls in only what's relevant when it's relevant, and lessons that have happened three times look different from lessons that happened once.

Q: Is anything sent to a server?

No. Everything is in ~/.claude-amplifier/amplifier.db on your own disk. No telemetry, no cloud, no syncing.

Q: Why not [mem0 / Letta / MemGPT]?

Those are full-stack memory systems with embeddings, retrieval, and orchestration. Great for production agents. Claude Amplifier is an opinionated toolkit for "I want Claude to remember things and tell me when patterns recur" — same SQLite the official MCP memory server uses, with a few features that matter for actual engineering work (pattern_key, decision lifecycles, recurrence counters).

Q: Can I use this in Claude Code AND Claude Desktop simultaneously?

Yes. They share the same SQLite database, so a lesson recorded in one is visible from the other.

Q: Will my lessons survive a Claude Amplifier upgrade?

Yes — the SQLite schema is forward-compatible. The migrate() step adds new columns without touching existing rows. Backup with claude-amplifier export <project> if you want to be cautious.

Q: What's the performance like?

Reading: indexed SQLite + WAL mode. Sub-millisecond up to ~50,000 rows. Writing: same order. The bottleneck is Claude reading the context, not the database serving it.

Q: Can I share lessons across machines or teammates?

Use claude-amplifier export <project> --out lessons.json, share the file, then claude-amplifier import lessons.json on the other side. Cloud sync is intentionally not built in — your team's hard-won architectural decisions probably shouldn't leave the building.

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Roadmap

The next things on the table — open an issue if any of these matter to you and you'd like it to jump:

• Semantic search — embed lessons + decisions for fuzzy "do we have anything like this?" lookups (Oracle currently uses token-overlap matching)
• Multi-project linking — a decision in frontend-app can reference a constraint from infra-platform
• Claude Code SessionStart hook — auto-call context_load without needing CLAUDE.md instruction
• Web dashboard — read-only browser view of what Claude remembers (still local-only)
• Project archetypes — claude-amplifier seed --archetype=nodejs-saas plants 20+ stack-specific lessons
• Auto-claim recording — Claude-Code hook that wraps lessons-from-conversation into record_claim automatically

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Data storage

~/.claude-amplifier/amplifier.db

Five tables: lessons, decisions, patterns, preferences, pattern_promotions. WAL mode enabled.

Lessons and decisions carry three v1.4.0 columns each: verification_status (claim / evidence / confirmed), confidence (0.0–1.0), and evidence_links (JSON array of evidence records).

Inspect directly with any SQLite tool:

sqlite3 ~/.claude-amplifier/amplifier.db ".tables"
sqlite3 ~/.claude-amplifier/amplifier.db "SELECT title, frequency FROM lessons WHERE frequency > 1 ORDER BY frequency DESC LIMIT 10;"
sqlite3 ~/.claude-amplifier/amplifier.db "SELECT id, title, status FROM decisions WHERE status='active';"

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Configuration

CLAUDE_AMPLIFIER_PROJECT

Auto-bootstraps context on server startup.

# Path (project name inferred from the directory basename)
CLAUDE_AMPLIFIER_PROJECT=/home/user/projects/my-app

# Or bare project name
CLAUDE_AMPLIFIER_PROJECT=my-app

If not set, falls back to process.cwd().

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Contributing

Found a real-world pattern that should be a starter lesson? PRs welcome — see CONTRIBUTING.md.

Build from source

git clone https://github.com/Sisuthros/claude-amplifier
cd claude-amplifier
npm install
npm run build
npm test            # 162 tests, all should pass
node dist/index.js help

License

MIT — see LICENSE.