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Git-native context layer for AI coding agents
ai-agent-context is a production-ready npm package that analyzes Git repositories and builds a structured, versionable knowledge layer in .agent/. Unlike simple file listings, it provides AI coding agents with deep understanding of architecture, dependencies, conventions, and decisions.
Model Context Protocol adapter for ai-agent-context. Exposes the repository knowledge graph to MCP clients over stdio. Contains no business logic of its own.
AI coding agents need more than a file tree. They need to understand:
ai-agent-context extracts this information deterministically and stores it as structured, versionable data in .agent/.
npm install -g ai-agent-context
Or use without installation:
npx agent-context <command>
# Initialize context for your repository
agent-context init
# Scan the repository
agent-context scan
# Explain a module
agent-context explain src/payments
# Check for changes
agent-context diff
# View status
agent-context status
initCreates .agent/ directory and configuration:
agent-context init
Creates:
.agent/config.json - Configuration file.agent/.gitignore - Git ignore for local cachescanAnalyzes the repository and generates context:
agent-context scan
Output:
Scanning repository...
✓ Analyzed 1,284 files.
Files 1,284
Source files 842
Test files 156
Modules 42
Dependencies 187
External deps 23
Entry points 11
Conventions 17
Decisions 6
Context updated:
.agent/index.json
.agent/architecture.json
.agent/dependencies.json
.agent/conventions.md
.agent/decisions.json
contextCompact repository context summary. Use limits for agent budget control:
agent-context context --max-modules 10 --max-entry-points 10 --max-conventions 5 --max-decisions 5
task <description>Get bounded, task-oriented context for an agent.
agent-context task "add idempotent payment retries" --target src/payments --max-modules 5
agent-context task "add idempotent payment retries" --json
impact <target>Get the bounded impact set for a proposed change.
agent-context impact src/payments --max-files 100
agent-context impact src/payments --json
explainExplains a module, a directory or a file:
agent-context explain src/payments
agent-context explain src/payments/gateways
Output:
Payments
Path:
src/payments
Entry points:
src/payments/index.ts
Responsibilities:
payment processing
refunds
Stripe integration
Depends on:
UserRepository
EventBus
StripeAdapter
Used by:
CheckoutService
SubscriptionService
External dependencies:
stripe
Public API:
createPayment()
refundPayment()
Tests:
14 tests
src/payments/*.test.ts
Important conventions:
domain errors must not cross the application boundary
Git activity:
high recent activity
When you point explain at a directory that is narrower than the module owning
it, the answer is scoped to that directory and says so:
Scope:
directory only — 4 file(s) under src/core/graph
owning module: packages/core/src (this answer does not cover the rest of it)
The JSON payload carries the same information in a scope field.
explain returns one of two projections, reported in the detail field:
agent-context explain src/payments # auto
agent-context explain src/payments --detail full # force the full projection
agent-context explain src/payments --detail compact # force the cheap one
Why the threshold exists. Describing a module is only worth doing when the
description is smaller than the module. Measured on this repository: explaining
the 383 KB packages/core/src module costs 16 KB (a 95.8% reduction), while the
full projection of a 300-byte fixture module costs 2–9x the module itself. For
modules that small the honest answer is "read the two files", which is what
compact leaves the agent free to do — it keeps the structure and drops the
symbol dump. Measured on the fixtures, auto cuts the cost of a small-module
explanation from 1.84x its source to 0.72x.
Every fact still carries a confidence and evidence in both projections; the compact level trims how many evidence entries are listed, not whether they exist.
diffShows context changes since last scan:
agent-context diff
Output:
Repository context changes
Added:
src/payments/refund-service.ts
Modified:
src/payments/payment-service.ts
Removed:
src/payments/legacy-provider.ts
Architecture:
payments now depends on refunds
Dependencies:
payments → EventBus
Conventions:
no changes
Decisions:
no changes
statusShows repository context status:
agent-context status
Output:
Repository context
Status: up-to-date
Last scan:
2026-09-18
Files:
1,284
Modules:
42
Pending changes:
0
verifyCI-friendly context verification. Exits with code 1 when .agent/ is missing, has unsupported schema, has invalid documents, has a stale config hash, or drifted from the working tree.
agent-context verify
agent-context verify --json
verify is read-only and never regenerates context.
--json output omits the (potentially very large) list of unchanged files and reports changes.unchangedCount instead; pass --full to include the complete list.
A reusable workflow is published at .github/workflows/reusable-verify-context.yml:
jobs:
context:
uses: modeusweb/ai-agent-context/.github/workflows/[email protected]
migrateBrings a persisted .agent/ up to the current schema. Context is committed, so it outlives the tool that wrote it, and a release that changes what the analyzer produces can leave a repository holding context that no longer matches its own source.
agent-context migrate # regenerate when needed
agent-context migrate --check # report only, exit 1 when action is needed
agent-context migrate --json
States: current, stale (drifted from the working tree), missing, invalid (unreadable or unsupported schema version). --check writes nothing, which makes it usable as a CI gate alongside verify.
detectReports what the analysis could not determine. An agent about to act on a dependency graph needs to know which parts of that graph are missing.
agent-context detect
agent-context detect --json
Output:
Coverage gaps
[!] import-cycle — 2 item(s)
modules form a dependency cycle
- packages/cli/src -> packages/cli/src/commands
- packages/core/src -> packages/core/src/config
[-] unresolved-import — 17 item(s)
imports of excluded build output; expected, and absent from the graph by design
- packages/core/test/architecture.test.ts -> ../dist/index.js
...
Analyzed 128/128 file(s); 100.0% of resolvable imports resolved (18 resolved, 0 unresolved, 17 excluded build-output import(s)).
These are gaps in the analysis, not defects in the repository.
Issues are ranked by severity and classified by cause, because "there is no dependency here" and "the analyzer failed to resolve it" are different facts:
The import resolution rate deliberately excludes imports of excluded build output and rejected traversals: neither is a resolution failure, and counting them would report a healthy repository as broken.
Exit codes: 0 nothing above info, 1 at least one warning, 2 at least one
error (the context should not be trusted without reading the affected files).
cleanRemoves generated context:
agent-context clean
agent-context clean --yes # skip the confirmation prompt
history <target>Bounded local Git history for a module or path: commits, authors, dates and the files each commit touched.
agent-context history src/payments
agent-context history src/payments --limit-history 50 --json
revision-diffLocal diff introduced by a revision relative to a base ref (HEAD by default).
agent-context revision-diff --revision HEAD~1
agent-context revision-diff --revision <sha> --base main --json
searchDeterministic, local lexical search (BM25) over the knowledge graph — no embeddings, no LLM, no network:
agent-context search "payment idempotency"
agent-context search "format user name" --json --limit 5
Every result carries score and a reason explaining why the node matched:
{
"query": "payment idempotency",
"backend": "bm25",
"results": [
{
"type": "symbol",
"id": "src/payments/payment-service.ts#PaymentService",
"score": 9.4,
"reason": "matched terms: idempotency, payment; ranked by bm25"
}
]
}
Exit code is 1 when nothing matched, which is convenient in scripts.
Two different floors for two different reasons. The published packages ship compiled JavaScript with no runtime dependencies, so nothing in the code needs a newer Node. This repository's tests are TypeScript and run through Node's native type stripping, which is unflagged only from 22.18 — on Node 20 the build succeeds but the tests cannot start at all.
CI mirrors this rather than asserting it: the test job runs the TypeScript suite on Node 22.18 and 24 across Linux, Windows and macOS, while npm run smoke packs the real tarballs, installs them into a clean project and drives the CLI and the MCP server over stdio on Node 20.11 as well. If engines.node is raised, the smoke job is what notices.
MCP protocol support spans five revisions; see
packages/mcp/README.md for the matrix and the
configuration presets.
The server is driven in CI by @modelcontextprotocol/sdk — the reference
implementation — as a real client: handshake, negotiated revision, tool schemas and
six tool calls against a real repository. Everything else that exercises it speaks
JSON-RPC by hand, which checks the server against the same understanding of the
protocol that wrote it. What no client can yet exercise is the modern per-request
revision, because the SDK's newest is 2025-11-25.
STABILITY.md states which exported symbols are a compatibility
promise, which are internal, and how a deprecation runs its course. The promise is
enforced: npm run api:check fails when the exported surface changes without the
lock being updated, and npm run stability:check fails when this file names a
symbol the packages do not export.
The lock covers both halves of a package's surface. Runtime exports come from the
built module; type-only exports come from the generated .d.ts read through
the TypeScript compiler, because a renamed type has no runtime binding and
would otherwise change the package without changing anything a check could see.
core has 161 exports and 112 exported types.
import { AgentContext } from 'ai-agent-context';
const context = await AgentContext.load({ root: process.cwd() });
// Scan repository
await context.scan();
// Explain a module
const module = await context.explain('src/payments');
// Get architecture
const architecture = await context.getArchitecture();
// Get dependencies
const dependencies = await context.getDependencies();
// Search context
const results = await context.search('payment idempotency');
The .agent/ directory contains structured, versionable context:
.agent/
├── config.json # Configuration
├── index.json # Repository index
├── architecture.json # Module architecture
├── dependencies.json # Dependency graph
├── conventions.md # Detected conventions
└── decisions.json # Architectural decisions
{
"schemaVersion": 1,
"generatedBy": "ai-agent-context",
"generatedAt": "2026-09-18T00:00:00.000Z",
"repository": {
"name": "my-project",
"root": "/path/to/repo"
},
"files": 1284,
"modules": 42,
"dependencies": 187,
"entryPoints": 11
}
{
"schemaVersion": 1,
"modules": [
{
"id": "payments",
"path": "src/payments",
"entryPoints": ["src/payments/index.ts"],
"dependsOn": ["users", "events"],
"usedBy": ["checkout"],
"role": {
"value": "service",
"confidence": 0.87,
"evidence": ["name matches *Service*"]
},
"responsibilities": ["payment processing", "refunds"]
}
]
}
{
"schemaVersion": 1,
"internal": [
{
"source": "src/checkout",
"target": "src/payments",
"kind": "imports"
}
],
"external": [
{
"source": "src/payments",
"target": "stripe",
"kind": "runtime"
}
],
"workspaceDependencies": []
}
.agent/config.json:
{
"version": 1,
"root": ".",
"include": ["src/**", "packages/**"],
"exclude": ["node_modules/**", "dist/**", "build/**", ".git/**"],
"languages": ["typescript", "javascript"],
"features": {
"architecture": true,
"dependencies": true,
"conventions": true,
"decisions": true,
"git": true
},
"security": {
"allowSensitiveFiles": false,
"redactSecrets": true,
"extraSensitivePatterns": [],
"readOnly": false
}
}
Every key is optional: omitted keys keep their defaults. The defaults already cover src/, packages/, apps/, lib/ and source files at any depth (*.{ts,tsx,js,jsx,vue,svelte,...}), plus **/*.md and *.json, while node_modules/, dist/, build/, coverage/, .git/ and .agent/ are always excluded.
security.readOnly, or the global --read-only flag, refuses every write while leaving every query working:
agent-context scan --read-only
# ✗ Refusing to scan and write .agent/: this repository is in read-only mode.
# Queries (status, explain, context, task, impact, search, detect, verify) keep working.
The guard lives in the AgentContext facade rather than in each command, so no code path can write around it — including an MCP tool handler and an embedder calling scan() directly. Only scan() and init() write.
.agent/config.json is written by contributors, so on its own it cannot enforce a rule the organization requires. .agent-policy.json is the floor beneath it, and it is looked up in the repository root or any parent directory — one file at a monorepo or organization checkout applies to everything under it. AGENT_CONTEXT_POLICY overrides the search.
{
"version": 1,
"exclude": ["vendor/private"],
"sensitive": ["*.tfvars"],
"allowSensitiveFiles": false,
"redactSecrets": true,
"readOnly": false
}
A repository may tighten; it may not loosen. The policy unions its patterns in, forces allowSensitiveFiles off when it says false, forces redaction on when it says true, and forces read-only on when it says true — none of which a repository setting or CLI flag can undo. A policy that sets redactSecrets: false, or carries an unknown version, is rejected rather than ignored: a policy that silently fails to apply is indistinguishable from no policy at all. See SECURITY.md.
A change to the policy invalidates the incremental cache, so context is never reused across a tightening of the rules.
ai-agent-context supports monorepo structures:
packages/
api/
payments/
users/
It detects:
Layering diagnostics are heuristic, confidence-bearing and evidence-based; they are advisory, not compiler-enforced rules.
.env, credentials, certificatesagent-context verify --json detects invalid schema and driftThe analyzer is deterministic and evidence-based, not omniscient. Two behaviours are worth knowing before you rely on it:
explain and impact scope to what you asked for. If the path you pass is
a directory narrower than the module that owns it, the answer covers only that
directory and says so in a Scope: block (and in the scope field of the JSON
payload). It never silently widens to the whole module.dist/), undeclared packages and aliases that point nowhere appear in
dependencies.json under unresolved with the reason. A non-empty
unresolved list is a signal about repository layout, not necessarily a bug.Platform built-ins (node:fs, node:path, …) rank below declared packages in
bounded projections: they are capabilities of the runtime, not facts about the
project.
agent-context detect tells you where the analysis was incomplete. Before
relying on the dependency graph, run it: it reports unresolved imports separated
into real gaps, excluded build output and rejected path traversals, plus failed
parses, cycles and layering violations.
tools/ground-truth.mjs compares the dependency graph with the answer produced by
the TypeScript compiler, which shares no code with this project:
npm run ground-truth
npm run ground-truth -- --json
It runs in CI as dependency graph vs typescript, and exits non-zero when
precision or recall falls below 100%.
Current result on this repository:
Why this is not the same number twice. summary.imports.resolutionRate is
produced by the analyzer describing itself: it counts what its own resolver
managed to resolve. A resolver bug and its own accuracy check can only agree with
each other. Here the specifiers are extracted with ts.createSourceFile and
resolved with ts.resolveModuleName, so a disagreement is possible and a
disagreement would fail the build.
What is compared. Ground truth is importer-to-imported pairs, lifted to module edges using the analyzer's file-to-module partition. That partition is a division of the file list, not a claim about dependencies; everything that decides whether an edge exists comes from the compiler.
Three scope rules, each counted in the output so none can hide a disagreement:
excludedOutput
class. An edge derived from dist/ would make the dependency graph depend on
whether the project happened to be built.ky's own type tests do — is a dependency on its local entry point. A
specifier the importing manifest declares as a dependency is a registry
dependency even when the name matches a package in the same tree, which is what
separates clsx's bench/ from ky's test-d/.package rule.The finer check. Eighteen module edges is a coarse denominator: one wrong
edge moves the percentage by five points. So every import the analyzer failed
to resolve is also put to the compiler and classified as expectedBuildOutput,
agreedMissing, or missed. A single missed entry means the headline
resolution rate is overstated.
Known limits. The compiler is only an oracle for TypeScript/JavaScript, and it applies its own resolution rules rather than the analyzer's configuration. This measures whether the resolver agrees with a well-known independent implementation — it does not certify the analyzer's heuristics, which remain confidence-bearing and advisory.
Measuring yourself is not evidence. Every repository above is one the analyzer
was written alongside, so a defect that only exists in third-party code would
pass all of it — and one did: a nested generic in a type annotation closed the
type argument list with >>, which the lexer had merged into a single shift
token, and the parser then scanned to the end of the file and dropped every
statement after it, reporting success. In a barrel file that is most of the
public surface.
Eight third-party repositories are therefore pinned by commit SHA in
tools/benchmark-repos.json:
npm run benchmark:public # clone, measure, delete
npm run ground-truth:public # both oracles, on the same set
A commit SHA rather than a branch, so two runs compare each other; a moving target would make every measurement incomparable with the last. Nothing is vendored — each repository is cloned into a temporary directory, measured, and deleted. "Single module" means the repository has no module edges to compare, so precision and recall are undefined there rather than 100%.
Parse coverage is complete: 1922 files, zero partial, zero failed. That is a CI gate, not an observation. A partial parse means the extractor gave up partway through a file and dropped the statements after that point, so the repository would report fewer dependencies than it has while showing a clean result — which is what happened until v0.15.0.
Repositories are added for the syntax they contain, not for their popularity. That is how TSX was found at all: eight plain-TypeScript and CommonJS repositories were all passing, and the first one chosen for containing TSX had 25 files out of 686 silently losing their imports.
CI runs this as public repositories, on pushes to master and weekly, but not
on pull requests: it needs the network, and a slow clone should not block a
change that can be reviewed without it.
Four sources produce entry points: declared package.json fields, npm scripts
that name a file, naming conventions, and behavioural signals. Only the first is
a fact — when a manifest says "bin": { "agent-context": "./dist/bin.js" }, the
file that command runs does not depend on anything in this package.
npm run ground-truth:entry
Measured: 14 declared entry files on this repository, 82 across the pinned set, 48 of them in a pnpm workspace where several packages declare more than one command. Precision 100%, recall 100%.
The other three sources are heuristics, and this project has no oracle for heuristics — a hand-labelled corpus would measure whoever labelled it, and a second heuristic written independently would measure itself. The tool says so on every run rather than printing a number it cannot defend.
The benchmark measures the claims rather than restating them, and CI fails on regressions:
Evidence coverage counts every object carrying a numeric confidence — the shape used for a heuristic — and asks how many cite at least one source. A repository with no heuristics reports null rather than 100%, because a perfect score would claim something was explained when nothing was. Determinism is checked by scanning each tree twice more with the cache bypassed and comparing a hash of the generated documents byte for byte; force: true re-reads every file, so a difference can only come from the analyzer.
Reproduce with npm run benchmark. The last size bucket is reported rather than hidden: on modules under 4 KB the tool is still more expensive than reading the source, and averaging that away with the large-module win would be the dishonest way to present the result.
The package is organized as a monorepo:
packages/
core/ # Core analysis engine
cli/ # Command-line interface
mcp/ # MCP adapter (dual-era: legacy + modern protocol revisions)
The core package (@ai-agent-context/core) provides:
The CLI package (ai-agent-context) provides:
The MCP adapter (@ai-agent-context/mcp) provides:
2024-11-05, 2025-03-26,
2025-06-18, 2025-11-25 negotiated through the initialize handshake, and
modern 2026-07-28 negotiated per request, plus server/discoveragent-context-mcp config claude-code # or cursor, cline, continue
agent-context-mcp config --list
# Developer initializes context
npm install -g ai-agent-context
agent-context init
agent-context scan
# Developer commits context to Git
git add .agent
git commit -m "chore: add agent context"
# AI agent can now query context
agent-context explain src/payments
# When architecture changes
agent-context scan
agent-context diff
# Git shows architectural changes
git diff .agent/architecture.json
The architecture is designed for extensibility:
MIT
Contributions are welcome — see CONTRIBUTING.md for the workflow, the analysis-code rules (determinism, evidence, confidence) and the release process.
Model Context Protocol adapter for ai-agent-context. Exposes the repository knowledge graph to MCP clients over stdio. Contains no business logic of its own.
{ "mcpServers": { "ai-agent-context-mcp": { "command": "npx", "args": [ "-y", "@ai-agent-context/[email protected]" ] } }}Tools
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FAQ
Kopieren Sie auf dieser Seite die stdio-Konfiguration für Cursor, Claude Desktop, Claude Code oder VS Code. Sie nutzt die Installation des Herausgebers, keinen PlugMCP-Proxy.
In diesem Eintrag ist keine erforderliche Umgebungsvariable aufgeführt.
@ai Agent Context/mcp läuft lokal über stdio.
Zuletzt geprüft: 2026-11-14. Model Context Protocol adapter for ai-agent-context. Exposes the repository knowledge graph to MCP clients over stdio. Contains no business logic of its own.