Agent Context Graph

Connect any agent runtime to any context-graph component.

Agent Context Graph is a lightweight adapter layer that decouples runtime-specific hooks from graph storage. It routes a common event protocol from runtime adapters to graph connectors, so you can mix and match SDKs and graph components.

Runtime Adapter  ->  Event Protocol  ->  Graph Connector(s)
(Claude,         (ToolStart,         (SkillGraphConnector,
 OpenAI)          ToolEnd, ...)       custom connectors, ...)

Runtime plugins are the distribution layer for host-specific hook wiring. They install hooks, skills, and setup helpers for a runtime, then call Agent Context Graph. They are not graph components and should not encode graph-specific meaning.

Just want to capture your Claude Code / Codex sessions? Start with the Context Graph guide — it walks through installing the plugin and wiring all the connectors end to end. This README covers the adapter layer itself and the in-process SDK path.

Installation

For command-hook runtimes such as Codex and Claude Code, prefer a user-level tool install:

uv tool install agent-context-graph --with "skills-graph[agent-context-graph]"

Or use the plugin bootstrap scripts; they fall back to uvx if the tool is not installed yet.

For SDK usage inside an application:

pip install agent-context-graph

With runtime adapters:

pip install agent-context-graph[claude]
pip install agent-context-graph[openai]

Graph connectors live in the graph packages that persist the data. For the skills graph connector:

pip install skills-graph[agent-context-graph]

Quick Start

Claude Agent SDK

from agent_context_graph import AgentLink
from agent_context_graph.adapters.claude import ClaudeAdapter
from claude_agent_sdk import ClaudeAgentOptions, query
from skills_graph import SkillGraph
from skills_graph.connector import SkillGraphConnector

# 1. Set up graph storage
skills = SkillGraph()
skills.setup()

# 2. Wire up the link
link = AgentLink()
link.add_connector(SkillGraphConnector(skills))

# 3. Create adapter
adapter = ClaudeAdapter(
    link,
    session_id="my-session",
    session_kwargs={"model": "claude-sonnet-4-20250514"},
)

# 4. Use with Claude Agent SDK
async for message in query(
    prompt="Review the available skills",
    options=ClaudeAgentOptions(hooks=adapter.get_runtime_hooks()),
):
    print(message)

OpenAI Agents SDK

from agent_context_graph import AgentLink
from agent_context_graph.adapters.openai import OpenAIAdapter
from agents import Agent, Runner, function_tool
from skills_graph import SkillGraph
from skills_graph.connector import SkillGraphConnector

# 1. Set up graph storage
skills = SkillGraph()
skills.setup()


# 2. Define a tool whose name matches the SkillGraphConnector defaults
@function_tool
def get_skill(name: str) -> str:
    skill = skills.get_skill(name)
    if skill is None:
        return f"Skill '{name}' not found."
    return f"{skill.name}: {skill.description}\n{skill.content}"


# 3. Wire up the link
link = AgentLink()
link.add_connector(SkillGraphConnector(skills))

# 4. Create adapter
adapter = OpenAIAdapter(
    link,
    session_id="my-session",
    session_kwargs={"model": "gpt-4o-mini"},
)

# 5. Run with hooks
agent = Agent(
    name="Skill Assistant",
    instructions="Use get_skill when the user asks for a named skill.",
    tools=[get_skill],
    model="gpt-4o-mini",
)
result = await Runner.run(
    agent,
    "Get the skill called 'cypher-basics'",
    hooks=adapter.get_runtime_hooks(),
)

# 6. Signal end (OpenAI SDK doesn't have a stop hook)
adapter.end_session()

Command Hook Runtimes

Some agent applications run hooks as external commands instead of in-process SDK callbacks. Runtime adapters should keep the product-specific JSON mapping at the edge, emit the shared Event protocol, and leave graph persistence in connectors such as SkillGraphConnector.

The installed command is runtime-dispatched:

agent-context-graph hook <command> [options]

Implemented:

Runtime	Adapter	Hook Shape
OpenAI Codex	CodexHooksAdapter	Command receives one JSON object on stdin
Claude Code	ClaudeCodeHooksAdapter	Command receives one JSON object on stdin

First-Time Plugin Setup

For Codex and Claude Code plugins, the recommended first-run path is the bootstrap command. It installs the runtime package (with the connector extras), checks Memgraph, and runs doctor.

Prerequisites:

• uv on PATH. (uv manages Python for the tool; if uv-managed Python downloads are blocked, install Python 3.10+ and rerun bootstrap.)

• Memgraph running and reachable over Bolt. Defaults are bolt://localhost:7687, empty user/password, database memgraph. If it isn't running locally:

  docker run --rm -p 7687:7687 memgraph/memgraph
  

1. Bootstrap all three connectors (this is what the installed plugin wires into its hooks):

# Codex
agent-context-graph bootstrap --runtime codex \
  --connector skills-graph --connector actions-graph --connector sessions-graph

# Claude Code
agent-context-graph bootstrap --runtime claude-code \
  --connector skills-graph --connector actions-graph --connector sessions-graph

The plugin wrapper script runs the same command (and falls back to uvx if the tool isn't installed yet):

./scripts/bootstrap.sh

2. Configure identity and connection. Bootstrap writes ~/.config/context-graph/config.toml; hooks read their configuration from that file at runtime (see Configuration — env vars are not read at hook time). Set your identity, which sessions-graph requires:

agent-context-graph config set identity.user_id "your-name"

The Memgraph connection defaults to bolt://localhost:7687. For a remote or HA instance:

agent-context-graph config set memgraph.url "neo4j://<coordinator-host>:7687"
agent-context-graph config set memgraph.user "<user>"
agent-context-graph config set memgraph.password        # prompts; stored 0600
agent-context-graph config set memgraph.database "memgraph"

3. Verify:

agent-context-graph config show
agent-context-graph doctor --runtime claude-code \
  --connector skills-graph --connector actions-graph --connector sessions-graph

Expected successful doctor output (use --runtime codex for Codex):

OK agent-context-graph executable: ...
OK agent-context-graph: ...
OK config: identity.user_id set
OK memgraph: reachable
OK connector:skills-graph: installed=...; memgraph=reachable
OK connector:actions-graph: installed=...; memgraph=reachable
OK connector:sessions-graph: installed=...; memgraph=reachable
OK runtime:claude-code: strict hook smoke passed

Reconciliation is a separate step. The connectors capture session activity, but turning a session's text into extracted entities (a :Person/:Organization graph) is done out-of-band — see sessions-graph § reconciliation. By default a finished session is marked reconciliation_status = 'pending' and sessions-graph reconcile --pending extracts it.

Configuration

Bootstrap and the config command write ~/.config/context-graph/config.toml (mode 0600). Hook subprocesses resolve their configuration from CLI flags and this file only — never from environment variables (they don't inherit your shell), per ADR 0002.

[identity]
user_id = "your-name"

[memgraph]
url = "bolt://localhost:7687"
user = ""
password = ""
database = "memgraph"

Manage it with:

agent-context-graph config show
agent-context-graph config get memgraph.url
agent-context-graph config set <key> <value>   # keys: identity.user_id, memgraph.{url,user,password,database}

Environment variables (MEMGRAPH_URL, MEMGRAPH_USER, MEMGRAPH_PASSWORD, MEMGRAPH_DATABASE, AGENT_CONTEXT_GRAPH_USER_ID) are consulted only at bootstrap time — if set, bootstrap persists them into the config file. Exporting them later has no effect on running hooks; use config set instead.

OpenAI Codex Plugin

Codex hook configuration can be installed as a user-level Codex plugin.

The runtime-plugin flow is:

Codex Plugin -> Codex Runtime Adapter -> Event Protocol -> Graph Connector -> Memgraph

The plugin installs Codex hook wiring. The Codex runtime adapter normalizes the hook payload. Graph connectors such as SkillGraphConnector decide what those events mean in their graph.

Plugin source:

context-graph/plugins/agent-context-graph-codex

Register the public Git-backed marketplace:

codex plugin marketplace add memgraph/ai-toolkit --sparse .agents/plugins

Then install or enable context-graph from the Codex plugin UI.

Check the installed hook environment with:

agent-context-graph doctor --runtime codex --connector skills-graph --connector actions-graph --connector sessions-graph

Graph credentials live in ~/.config/context-graph/config.toml (written by bootstrap/config set), not in plugin hook files or the process environment — hooks read that file at runtime. See Configuration.

Claude Code Plugin

Claude Code hook configuration can be installed as a Claude Code plugin.

The runtime-plugin flow is:

Claude Code Plugin -> Claude Code Runtime Adapter -> Event Protocol -> Graph Connector -> Memgraph

For a public Git-backed marketplace install, add the marketplace inside Claude Code:

/plugin marketplace add memgraph/ai-toolkit

Then install:

/plugin install context-graph@context-graph-plugins

Check the installed hook environment with:

agent-context-graph doctor --runtime claude-code --connector skills-graph --connector actions-graph --connector sessions-graph

Source Development

For source development and per-project experiments, you can generate local Codex hook files:

agent-context-graph setup codex --project-dir "$PWD" --setup-schema

This writes local, ignored files:

.codex/config.toml
.codex/hooks.json

See Command Hook Reference for manual setup, non-default Memgraph values, smoke tests, and generated hook JSON details.

Multiple Graph Components

from agent_context_graph import AgentLink
from agent_context_graph.adapters.claude import ClaudeAdapter
from skills_graph import SkillGraph
from skills_graph.connector import SkillGraphConnector

skills = SkillGraph()

link = AgentLink()
link.add_connector(SkillGraphConnector(skills))
link.add_connector(MyGraphConnector(...))

adapter = ClaudeAdapter(link, session_id="s-1")
hooks = adapter.get_runtime_hooks()

Connectors are owned by the graph packages because each graph package knows its own schema and persistence rules.

Architecture

Event Protocol

All runtime adapters emit runtime-agnostic Event dataclasses:

Event	When
SessionStartEvent	Agent session begins
SessionEndEvent	Agent session ends
ToolStartEvent	Before tool/function call
ToolEndEvent	After tool/function returns
AgentStartEvent	Agent/subagent begins
AgentEndEvent	Agent/subagent finishes
LLMStartEvent	Before LLM call
LLMEndEvent	After LLM response
HandoffEvent	Agent hands off to another
MessageEvent	User/assistant/system message
ErrorOccurredEvent	Error during execution

Runtime Adapters

Adapter	Runtime Source	Hook Mechanism
ClaudeAdapter	Claude Agent SDK	Dict of HookMatcher callbacks
OpenAIAdapter	OpenAI Agents SDK	RunHooksBase subclass
CodexHooksAdapter	OpenAI Codex	Command hooks reading JSON from stdin

Graph Connectors

Connector	Graph Component	Events Handled
SkillGraphConnector	skills-graph	Tool/message events matching skill access/search operations
ActionsGraphConnector	actions-graph	Session, tool, message, subagent, and error events → action nodes
SessionsGraphConnector	sessions-graph	SessionStartEvent/SessionEndEvent → (:User), (:Session), HAD_SESSION; marks sessions for reconciliation on end

The installed plugin wires all three (--connector skills-graph --connector actions-graph --connector sessions-graph). Each connector lives in the package that owns its graph schema; additional connectors should too.

Adding a New Runtime Adapter

Implement RuntimeAdapter:

from agent_context_graph import AgentLink, ToolStartEvent
from agent_context_graph.protocols import RuntimeAdapter


class MyRuntimeAdapter(RuntimeAdapter):
    def __init__(self, link: AgentLink, session_id: str):
        self._link = link
        self._session_id = session_id

    def get_runtime_hooks(self):
        # Return whatever your runtime expects.
        ...

    def _on_tool_call(self, name, args):
        self._link.emit(
            ToolStartEvent(
                session_id=self._session_id,
                tool_name=name,
                tool_input=args,
            )
        )

Adding a New Command-Hook Runtime Adapter

The pattern above fits in-process runtimes — something that calls your Python code directly (an SDK callback, an embedded framework). Command-hook runtimes are different: the harness invokes an external command with a JSON payload on stdin (Claude Code, Codex), rather than calling into your process.

Three pieces beyond RuntimeAdapter itself, exactly as adapters/claude_code.py and adapters/codex.py implement them:

1. A payload translator. Same idea as RuntimeAdapter.get_runtime_hooks(), but the input is the harness's raw JSON payload rather than a native callback. Map each of the harness's hook event names to the matching Event subclass and call link.emit(...).
2. A hook-config generator (build_hooks_config(command)). Builds whatever config shape the harness expects for wiring hooks, pointing every hook at your CLI entry point.
3. A response function (response_for_payload(payload)). Returns the JSON the harness expects back on stdout, or None.

The stdin-loading, connector-construction, and CLI-argument-parsing scaffolding around those three pieces is shared — hooks/runner.py's run_hook(plugin, argv) does that for every registered runtime, so a new adapter doesn't write its own main() at all. Register your runtime as a plugin and the generic runner (plus bootstrap/doctor/hook run/hook init) picks it up automatically — no changes to agent-context-graph itself:

# my_package/adapter.py
from dataclasses import dataclass

from agent_context_graph.protocols import RuntimeAdapter


class MyCommandHookAdapter(RuntimeAdapter):
    def __init__(self, link, session_id: str | None = None):
        self._link = link
        self._session_id = session_id

    def get_runtime_hooks(self):
        return build_hooks_config("my-runtime hook run my-runtime")

    def handle_payload(self, payload: dict) -> None:
        for event in self._events_from_payload(payload):
            self._link.emit(event)

    def _events_from_payload(self, payload: dict):
        # Map the harness's own hook_event_name / payload shape to Event subclasses.
        ...


def build_hooks_config(command: str, *, timeout: int = 30) -> dict:
    # Return whatever config format your harness expects, every hook pointing at `command`.
    ...


def response_for_payload(payload: dict) -> dict | None:
    # Return the JSON your harness expects back, or None.
    ...


@dataclass(frozen=True)
class MyRuntimePlugin:
    name: str = "my-runtime"
    adapter_class: type = MyCommandHookAdapter

    def response_for_payload(self, payload: dict) -> dict | None:
        return response_for_payload(payload)

    def build_hooks_config(self, command: str, *, timeout: int = 30) -> dict:
        return build_hooks_config(command, timeout=timeout)

    # init(project_dir, connectors, **kwargs) is optional -- omit it if your
    # runtime has no project-local hook-config file to generate (matching
    # ClaudeCodeHooksAdapter's own plugin, which doesn't define one yet).


PLUGIN = MyRuntimePlugin()

Then register it in your own package's pyproject.toml — this is the entire integration, no fork or PR against this repo required:

[project.entry-points."agent_context_graph.runtimes"]
my-runtime = "my_package.adapter:PLUGIN"

Once installed, agent-context-graph bootstrap --runtime my-runtime, doctor --runtime my-runtime, hook run my-runtime, and hook init my-runtime (if init is implemented) all work exactly like the built-in Codex and Claude Code plugins — see runtime_plugin.py for the full protocol and pyproject.toml's own [project.entry-points."agent_context_graph.runtimes"] for how Codex/Claude Code register themselves.

Adding a New Graph Component

Implement GraphConnector in the graph package:

from agent_context_graph import EventType
from agent_context_graph.protocols import GraphConnector


class MyGraphConnector(GraphConnector):
    def supports(self, event):
        return event.event_type in {EventType.TOOL_START, EventType.TOOL_END}

    def on_event(self, event):
        # Write to your graph component.
        ...

License

MIT