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  3. Contextful
Contextful logo
Health: ActiveRecent health check succeeded.Last checked 9/22/2026, 6:31:26 PM

Contextful

User RatingsBe the first to rate and review this MCP server! Enrichment pendingWe haven’t run our AI enrichment pass on this listing yet, so the overview, use cases, and FAQ below may be sparse or missing. We work through the catalog over time β€” check back soon.
View Repository4 GitHub StarsTotal stargazers on GitHub for the source repository (4 stars).Visit Website

Efficient context management: code search, evidence packs, and memory for coding agents.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent β€” or use 1-click editor setup below.

Add to CursorAdd to VS Code
Not yet automatically verified

We haven't yet run this listing's install command through our automated sandbox check. This isn't a red flag β€” we're steadily working through the catalog.

Manual Client & Custom JSON ConfigExpand JSON β–Ύ

Client Config & Setup

Choose your client or environment
Target File:~/Library/Application Support/Claude/claude_desktop_config.json
claude_desktop_config.json
{
  "mcpServers": {
    "contextful": {
      "command": "npx",
      "args": [
        "-y",
        "@inferensys/contextful"
      ]
    }
  }
}

πŸ’‘ Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Install Directory Badge Claim listing Alternatives🧠 More in Knowledge & Memory

Documentation Overview

contextful cover image

Contextful

⚠️ This is in early alpha. The API, features, and integrations are not stable. Expect breaking changes. Feedback & contributions are very welcome!

Local Context Management + Search Engine + Memory for Agentic AI.

Contextful is a runtime contextual layer and local search engine for agents that gives them one fast way to find, compress, cite, and remember project context.

Available as a CLI-first tool with an MCP runtime bridge and generated agent instructions, it integrates seamlessly with Codex, Claude Code, Cursor, Windsurf, GitHub Copilot, VS Code, Cline, Roo Code, Continue, and Zed.

Contextful screenshot

Instead of making an agent read 40 files every session, Contextful indexes the project once and returns a ranked, cited, token-budgeted context pack.

Why?

Context has always been a bottleneck for agentic AI. Large context window models (for example, 1M tokens) are:

  1. Expensive and require significantly more compute & processing time.
  2. More likely to lose key information as the context window fills up.
  3. Most projects have millions of lines of code, but agents can only fit in limited tokens per context window.

The current solution is to make the agent guess which files to read, then pay the token cost to read them every session. This is slow, expensive, and lossy.

Apart from this, agents have no way to store or share learnings across sessions. Every time they start, they forget everything and have to re-read the same context again.

Contextful screenshot

I started developing Contextful to keep the context window smaller by enabling efficient knowledge retrieval. If we index the project and return a ranked, cited, token-budgeted context pack, we can:

  • 100x more efficient token usage: stop paying tokens to re-read the same files.
  • Fewer tool calls: one context pack can replace dozens of grep, glob, and read-file calls.
  • No lost context between sessions: agents can store session learnings in an evidence-backed memory ledger.
  • Shareable project knowledge: lessons and context packs survive context compaction and future sessions.

Key Features

1. Context Management

The default local store is SQLite with FTS-backed search and typed graph tables. V1 ships with:

  • SQLite as the default local store.
  • FTS5 lexical/BM25 search.
  • Typed graph tables: nodes, edges, node_props, edge_props.
  • A hot adjacency cache for common graph relations.
  • Deterministic structural fingerprints inspired by Code2Vec-style secondary reranking signals.

The next storage upgrades are optional semantic vectors through sqlite-vec, LanceDB, or local HNSW, and compressed adjacency lists with Roaring bitmaps or CSR arrays for larger repositories.

2. Search Engine

Contextful screenshot

Contextful analyzes the query, classifies intent, and combines lexical search, symbols, docs, graph relationships, and memory hits to retrieve the right evidence. The goal is Google-level project search for agents: vague queries like "resources for auth onboarding" should still land on the right code, docs, and prior lessons.

3. Memory Ledger

Agents can store lessons, decisions, and useful project facts, but not as loose "remember this" notes. Every memory requires evidence refs from files, symbols, commits, or prior context packs. When the evidence changes, Contextful marks the memory stale.

4. Contextful Execution

Contextful is an MCP server, local indexer, and small CLI:

  • MCP server: the agent interface.
  • Local daemon / watcher: indexing, rebuilds, freshness, and future benchmarks.
  • CLI (cxf): human setup, indexing, search, memory writes, and local smoke tests.

MCP is the right interface because tools, resources, and prompts are exactly what MCP standardizes. The agent asks for context; Contextful returns compact evidence.

Install

Terminal
npx @inferensys/contextful init --workspace .
npx @inferensys/contextful search "where is user auth handled" --workspace . --budget 2000

Run as an MCP server:

Terminal
npx @inferensys/contextful server

CLI

The primary binary is cxf; contextful is also provided as a readable alias.

bash
cxf init --workspace <path>
cxf index --workspace <path> [--watch]
cxf daemon --workspace <path>
cxf search "<query>" --workspace <path> --budget 2000 --json
cxf memory add --workspace <path> --claim <text> --evidence <ref>
cxf server

Core MCP Tools

Keep the agent surface small:

  • context_pack(query, budget, scope) - the killer tool. Returns a ranked, cited, token-budgeted bundle instead of forcing 40 random file reads.
  • search_code(query, mode, filters) - powerful code, docs, symbol, and memory search.
  • trace_path(from, to, edge_types) - graph traversal across files, symbols, modules, and config.
  • impact_analysis(symbol_or_file) - reverse dependencies and likely tests.
  • why_changed(symbol_or_file) - current evidence plus git history.
  • recall_memory(query, scope) - search session learnings and durable project lessons.
  • write_lesson(claim, evidence_refs, scope) - store an evidence-backed memory.

MCP Client Setup

Use this stdio server command in any MCP-aware coding tool:

config.json
{
  "mcpServers": {
    "contextful": {
      "command": "npx",
      "args": ["-y", "@inferensys/contextful", "server"]
    }
  }
}

Codex:

bash
codex mcp add contextful -- npx -y @inferensys/contextful server

CLI-First Agent Flow

Use cxf init once per workspace. It indexes the project and writes .contextful/AGENT_INSTRUCTIONS.md, a compact skill-style guide that tells agents when to call context_pack, when to search more narrowly, and when memory writes are allowed.

Use cxf search when a human wants to test the same evidence pack an agent will receive:

bash
cxf search "how does auth load user profiles?" --workspace . --budget 2000

The MCP server remains the agent interface. The CLI is for setup, inspection, and repeatable local tests.

Privacy

V1 is local-only. It does not call external embedding APIs, upload source code, edit source files, auto-fix code, or install dependencies inside the target workspace.

Evidence Refs

Memory writes require evidence references returned by search or context packs:

  • file:src/auth.ts:10-40
  • symbol:src/auth.ts#AuthService:12
  • pack:ctx_...

Invalid or stale evidence is rejected or marked stale.

Read the full README β†’View source on GitHub β†’

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Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks β€” not a rating.

GitHub stars
4
Stargazers on the source repository.
npm downloads
183
Package downloads in the last 30 days.
Last commit
4mo ago
Most recent push to the default branch.
Directory activity
2 views
Config copies, upvotes, and views on AllMCPs.

Reviews

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Frequently Asked Questions about Contextful

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "contextful": { "command": "npx", "args": ["-y","@inferensys/contextful"] } }

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Technical Specs & Signals

Category🧠Knowledge & Memory
More technical detailsExpand β–Ύ
TransportSTDIO
RuntimeNode.js
Last updatedMay 23, 2026
11/13 checks healthy over the last 45d
Views2
Unique ViewsTotal visits recorded for this listing page on AllMCPs.
Installs0
Installs & Copy ActionsTotal times users copied install commands or configuration snippets for this server.
GitHub stars4
GitHub Star CountTotal stargazers on GitHub representing community popularity (4 stars).
Last commit4mo ago
Last Repository CommitThe most recent commit or push recorded for this server's GitHub repository.Last commit on May 23, 2026
npm downloads183/mo
Monthly npm DownloadsAverage monthly package installs recorded from npm registry statistics.
40Quality signal: Fair Β· 40/100How this signal is calculated β–Ύ
Server availabilityNot measured

Not scored for repo-hosted servers β€” we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership10/20
Documentation & tools16/30
Adoption & activity4/15
Community engagement0/10

A guidance signal from public completeness & health data β€” not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

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Scanned 1d ago via OSV.dev Β· @inferensys/contextful (npm)

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