Agent Memory Bridge

简体中文

Your coding agent should not rediscover the same project decisions every session.

Agent Memory Bridge is persistent engineering memory for coding agents: a local-first MCP memory layer and context compiler backed by SQLite + FTS5. It captures durable repo decisions, gotchas, procedures, and handoffs while keeping short-lived coordination separate.

Codex is the reference workflow, not the product boundary. If a client can launch a local stdio MCP server, it can use Agent Memory Bridge.

Why It Exists

Most agent memory either feels too shallow or too heavy:

• summaries become stale blobs
• vector stores hide why something was recalled
• every new session re-learns the same gotchas
• handoff state turns into ad hoc notes or a queue you did not want to build

AMB takes a smaller path: local SQLite, explicit namespaces, inspectable records, benchmarked recall, and a signal lifecycle for lightweight coordination.

What You Get

• Durable memory: decisions, gotchas, procedures, concepts, beliefs, and supporting records.
• Coordination signals: claim -> extend -> ack / expire / reclaim without pretending to be a scheduler.
• Governed learning: session output can move through summary -> learn / gotcha -> domain-note -> belief -> concept-note.
• Context assembly: startup and task-time context can be compiled from procedures, concepts, beliefs, gotchas, and linked support without adding more MCP tools.
• Proof discipline: release contract checks, public-surface checks, onboarding checks, benchmark snapshots, and 201 passed.

Who It Is For

• You use Codex, Claude, Cursor, Cline, Antigravity, or another MCP client and keep re-explaining the same project conventions.
• You want memory that is local and inspectable instead of a hosted platform or opaque vector stack.
• You run review, handoff, or multi-agent workflows and need coordination signals without building a full task queue.

Install

Requirements:

• Python 3.11+
• SQLite with FTS5 support
• any MCP-compatible client that can launch a local stdio server

One-command GitHub smoke test with uvx:

uvx --from git+https://github.com/zzhang82/Agent-Memory-Bridge agent-memory-bridge verify

Local editable install:

python -m venv .venv
# Activate the virtual environment for your shell, then:
python -m pip install -e .
agent-memory-bridge doctor
agent-memory-bridge verify

Generate a placeholder-safe client config:

agent-memory-bridge config --client generic --example
agent-memory-bridge config --client codex --example
agent-memory-bridge config --client cursor --example

Dockerized stdio works too when you want an isolated runtime:

docker build -t agent-memory-bridge:local .
docker run --rm -i -e AGENT_MEMORY_BRIDGE_HOME=/data/agent-memory-bridge -v /path/to/bridge-home:/data/agent-memory-bridge agent-memory-bridge:local

Client-specific notes live in docs/INTEGRATIONS.md. Runtime configuration lives in docs/CONFIGURATION.md. Authority and correction rules live in docs/AUTHORITY-CONTRACT.md. Security guidance lives in SECURITY.md.

The First Useful Loop

Session 1 discovers a project rule:

store(
  namespace="project:demo",
  kind="memory",
  content="claim: Use WAL mode for concurrent SQLite readers."
)

Session 2 asks about the same project:

recall(namespace="project:demo", query="SQLite concurrent readers")

The agent gets the rule back without the user typing it again.

For coordination, use signals:

store(namespace="project:demo", kind="signal", content="release note review ready")
claim_signal(namespace="project:demo", consumer="reviewer-a", lease_seconds=300)
extend_signal_lease(id="<signal_id>", consumer="reviewer-a", lease_seconds=300)
ack_signal(id="<signal_id>")

The short version:

WITHOUT AMB
user> We hit this last time too: run the generator after schema edits.

WITH AMB
agent> I found the previous gotcha: run the generator after schema edits.

The terminal demo and the before/after gotcha story are in examples/demo, with the story source at examples/demo/before-after-gotcha.cast.md.

Client Support

Status labels are intentionally narrow.

MCP Tools

The bridge exposes 10 public MCP tools:

• store, recall, browse, stats
• forget, promote, export
• claim_signal, extend_signal_lease, ack_signal

The richer behavior stays behind that surface: reflex promotion, consolidation, startup/task-time assembly, procedure governance, telemetry summaries, and signal contention checks. There are no separate task_packet or startup_packet MCP tools.

Proof Snapshot

0.13.1 is a launch-surface polish release over the 0.13 coordination runtime while keeping the public tool surface stable.

Snapshot facts checked by the release contract:

question_count = 11
memory_expected_top1_accuracy = 1.0
memory_mrr = 1.0
file_scan_expected_top1_accuracy = 0.636
file_scan_mrr = 0.909

sample_count = 16
classifier_exact_match_rate = 0.875
fallback_exact_match_rate = 0.062
classifier_better_count = 13
fallback_better_count = 2
classifier_filtered_low_confidence_count = 2

case_count = 7
flat_case_pass_rate = 0.429
governed_case_pass_rate = 1.0
flat_blocked_procedure_leak_rate = 1.0
governed_blocked_procedure_leak_rate = 0.0
governed_governance_field_completeness = 1.0

signal_contention_case_count = 5
signal_contention_case_pass_rate = 1.0
unique_active_claim_rate = 1.0
duplicate_active_claim_count = 0
active_reclaim_block_rate = 1.0
stale_ack_blocked_rate = 1.0
stale_reclaim_success_rate = 1.0
pending_under_pressure_claim_rate = 1.0
initial_hard_expiry_cap_rate = 1.0

adversarial_case_count = 6
adversarial_task_count = 7
adversarial_governed_task_pass_rate = 1.0
adversarial_governed_blocked_record_leak_rate = 0.0

Full proof details are in benchmark/README.md.

Boundaries

AMB is not a graph database, hosted memory platform, scheduler, worker runtime, distributed lock, exactly-once coordination system, packet API, or automatic procedure learner. It is a small local bridge for reusable engineering memory and lightweight coordination.

For alternatives and trade-offs, see docs/COMPARISON.md.

Docs

• Client integrations
• Configuration
• Authority contract
• Benchmark and proof harness
• Context assembly
• Memory taxonomy
• Promotion rules
• Client provenance
• Examples
• Contributing
• Security

License

MIT. See LICENSE.