Pond

pond

[](https://github.com/tenequm/pond/actions/workflows/ci.yml) [](https://crates.io/crates/pond-db) [](https://pond.locker/) [](LICENSE)

Lossless storage and search for AI agent sessions, across every agentic client.

Quickstart. Install, run guided setup, and ingest your local sessions:

brew install tenequm/tap/pond
pond init   # guided setup: storage, adapters, MCP registration, optional schedule
pond sync   # ingest, embed, update indexes - every enabled adapter

pond init registers pond as an MCP server for detected clients; to add it by hand:

claude mcp add -s user pond -- pond mcp   # Claude Code
codex mcp add pond -- pond mcp            # Codex

Pond keeps every AI conversation you've ever had intact and searchable, and lets you continue any of them in any supported tool - your history, your search, your sessions, independent of the agent vendor that made them. It is one Rust binary that ingests sessions from registered agentic-client adapters into a canonical Session / Message / Part interlingua, stores them in Lance on object storage, and serves search over them via HTTP+JSON and MCP. Two deployments: a personal pond on your laptop, or a multi-tenant backend for hosted agent infrastructure. No extra database, no wrapper around Lance.

Current automatically synced agent clients:

• Claude Code CLI
• Claude desktop app (local agent mode)
• Codex CLI
• opencode CLI
• pi-coding-agent CLI

You can also import a Claude.ai data export with the claude-ai-export adapter - a manual download, so it is not auto-discovered: pond sync claude-ai-export --path .

Status: pre-v1. Schemas, wire shapes, and config keys are subject to breaking change until v1. Full documentation lives at pond.locker; the contract is [docs/spec.md](docs/spec.md).

Background

Every agentic CLI ships its own session format and its own search surface. Switching tools means losing history. Replaying a Claude Code session in another provider's tooling means re-translating the wire shape by hand. Hosted multi-tenant deployments rebuild the same storage layer from scratch.

Pond is the storage and retrieval layer that sits underneath. Every adapter is a bidirectional codec between a client format and one canonical schema, so any session can be restored by any adapter - it need not return to the client that produced it. Storage, search (vector or BM25 full-text, one arm per query), and provider-agnostic replay all sit on a single Lance-on-object-storage foundation.

The v1 surface includes: full CLI, HTTP+JSON and MCP transports, search over three Lance datasets, intfloat/multilingual-e5-small embeddings at FP16 weights (Metal on macOS, CUDA opt-in, CPU fallback), and local-FS / S3 / GCS / Azure backends through Lance's object_store integration.

Install

Linux and macOS are supported; Windows is not in v1 scope.

Package Managers (macOS and Linux):

brew install tenequm/tap/pond                       # Homebrew
nix profile add github:tenequm/pond-nix#pond        # Nix
cargo install pond-db                               # crates.io (installs the `pond` command)

Build from source:

git clone https://github.com/tenequm/pond.git
cd pond
cargo install --path .

For CUDA acceleration on Linux:

cargo install --path . --features cuda

On macOS the Metal backend is selected automatically; on other systems the CPU fallback runs without extra features.

Usage

Set up storage, adapters, MCP registration, and an optional sync schedule in one pass (idempotent - re-run it any time to repair or update):

pond init

Then import sessions from local adapters, embed them, update indexes, and search:

pond sync
pond search "how did we wire up the OCC retry loop"

Run a server:

pond serve                         # HTTP on 127.0.0.1:9797
pond serve --transport stdio       # MCP over stdio
pond mcp                           # alias for stdio MCP

Fetch a single session or message, or move a whole corpus:

pond get --session-id 
pond copy --from local --to snapshot.pond
pond copy --from snapshot.pond --to local

Ask structured questions with read-only SQL (the same surface as the pond_sql_query MCP tool):

pond sql "SELECT project, count(*) FROM messages GROUP BY project ORDER BY 2 DESC"

Run maintenance on demand (sync already embeds inline and folds indexes every run):

pond optimize --only embed
pond optimize --only index

Keep pond current automatically (launchd on macOS, systemd user timers or cron on Linux):

pond schedule start                # every 5m by default (--every 15m|1h|6h|1d)
pond schedule status
pond schedule logs

pond status prints a per-table storage table, then indexes (text/semantic readiness), stored (sessions + searchable messages), and adapters (configured adapter count). Pass --adapters for per-project tables and per-intent index detail. pond search --explain returns Lance's analyze_plan output for each retrieval arm.

Remote storage

By default pond stores data locally under $XDG_DATA_HOME/pond. To use an object store, add credentials and switch the destination:

pond creds add                                                    # interactive: name, access key, hidden secret
pond storage use s3+https://nbg1.your-objectstorage.com/my-pond   # probe end-to-end, then flip [storage].path
pond storage check                                                # verify: parse, creds, conditional-put (OCC), write/read/delete

pond init --storage-path configures a remote destination during setup and prompts for credentials inline when the destination is remote, so a bucket is one command. The s3+https://host/bucket form works for any S3-compatible store (Hetzner, R2, B2, MinIO); s3://, gs://, and az:// use the standard cloud SDK credential chain when no [creds.*] set matches. pond copy --from --to carries existing local data into the bucket - idempotent, never deletes the source, and on completion it rebuilds the destination indexes and verifies every row landed (exit 6 if any are missing or duplicated, so you never reconcile by hand). pond copy --verify-only --from --to runs that same check read-only, without copying. Full walkthrough: pond.locker.

Configuration

pond init walks through everything below interactively and enables the adapters it finds. pond sync only ingests already-enabled adapters - enabling one is an explicit step (pond adapters enable / pond adapters discover / pond init), never a side effect of sync. Config lives under $XDG_CONFIG_HOME/pond/. Every [adapters.] block needs enabled = true to be active; sections without it (or with enabled = false) are skipped.

[adapters.claude-code]
enabled = true
path = "~/.claude/projects"

[adapters.codex-cli]
enabled = false                    # kept in config, skipped on `pond sync`
path = "~/.codex/sessions"

Verbosity

Root-level -v / -vv / -vvv raise the tracing level (info / debug / trace); -q / -qq lower it. The default surfaces warnings only. RUST_LOG overrides the CLI flag when set; POND_LOG is no longer honored.

Design

The full contract is in [docs/spec.md](docs/spec.md). Key choices:

• Lance direct, no wrapper. The lance-format/lance crates are the only storage and search engine. No lancedb, no parallel abstraction. Storage, indexing, OCC, schema evolution, blob columns, versioning, and time-travel are all Lance. The read-only pond sql surface is DataFusion planning over the same Lance datasets - a query escape hatch, not a second engine.
• Canonical Session / Message / Part interlingua. Owned in pond, in the shape of Effect v4's Prompt-side Part union. This schema is pond's product; everything else is machinery around it.
• Three Lance datasets (sessions, messages, parts). messages carries the nullable embedding (vector + embedding_model) alongside denormalized filter columns (source_agent / project / role / timestamp) for single-stage filter pushdown.
• No-synthesis adapter seam. Adapters parse source records through extractor helpers that make "invent a value" a compile error - model-no-synthesis, model-schema-honesty, and adapter-provenance-required are structural, not review rules.
• Index lifecycle decoupled from writes. Writes commit data (embeddings included, computed inline at ingest) without folding the search indexes. pond sync runs index maintenance by default, and pond optimize --only index runs it on demand; Lance merges index results with a flat scan over unindexed fragments, so reads stay correct.
• Single-arm retrieval. Each query runs one retriever - vector (cosine, with a gentle recency tiebreaker) or fts (BM25) - chosen per query; no server-side fusion. The vector arm falls back to full-text when the store has no embeddings, and --sort-by recency returns newest-first. Results group to one summary per session, keyed on session_root.
• Language-neutral full-text. Word-level simple tokenizer with English stemming (ascii-folding on); tokens the stemmer does not recognize pass through unchanged and stay exact-matchable, so pond indexes sessions in any language alike.
• Two transports, one handler set. HTTP+JSON (axum) and MCP (rmcp) both dispatch into the same handlers. Wire ops: pond_search, pond_get, pond_ingest. MCP additionally exposes the read-only pond_sql_query tool and the schema://pond, schema://pond-sql, and stats://pond resources.
• Opaque-string multi-tenancy. Each tenant is a namespace string the integrator supplies; pond does not authenticate, authorize, or model identity. The object store's IAM is the storage boundary.
• Encryption is operational. Bucket SSE plus filesystem encryption; pond holds no keys and adds no application-level crypto.

References

The upstream schemas that shaped pond's canonical model are documented in [docs/references/](docs/references/) (source URLs + why each matters; the vendored code itself is not redistributed). Real session captures live under tests/fixtures/adapter/.

| Source | Why it matters | |--------|----------------| | Effect-TS/effect | Effect v4 Prompt/Response Part unions. Pond's canonical types copy this shape. | | sst/opencode | Effect Schema canonical Part union; SDK types; storage schema. | | kilo-org/kilocode | OpenCode fork. Adds editorContext, plan-followup, kilocode-specific events. | | badlogic/pi-mono | pi-coding-agent leaf-cursor branching and cross-provider conformance test matrix. | | open-telemetry/semantic-conventions-genai | GenAI semantic conventions. Inspiration for shape overlap; pond does not derive from OTel. | | tests/fixtures/adapter/ | Real session captures for nine source harnesses (claudeaiexport, claudecode, claudedesktopapp, claudemanagedagents, codex_cli, nanoclaw, openclaw, opencode, pi-coding-agent). Drives adapter design and serves as adapter test fixtures. |

Contributing

Issues and pull requests are welcome. The most useful contributions right now:

• Spec feedback on [docs/spec.md](docs/spec.md).
• Pointers to additional reference schemas or session samples worth documenting under docs/references/.
• Bug reports against the v1 surface (CLI verbs, wire ops, schema mismatches, OCC behavior, object-store backends).

For larger changes, open an issue first to discuss the direction. For security issues, see [SECURITY.md](.github/SECURITY.md).

License

[Apache-2.0](LICENSE) (c) 2026 tenequm

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: tenequm
• Source: tenequm/pond
• License: Apache-2.0
• Homepage: https://pond.locker

Install and usage instructions live in the source repository linked above.