---

EchoesVault stores architectural decisions, verified fixes, daily work notes, and other durable project knowledge as Markdown in the repository. Version 2 is a thin adapter for EchoesVault Protocol 1.0.0: OpenCode, Codex, Claude Code, and scripts all delegate writes to the same project-local runtime and share one knowledge base.

Why version 2

• One writer across agents — every mutation uses .echoes-vault/echoes_vault.py.
• Git-friendly collaboration — daily entries use unique UTC-sortable files and the generated index is ignored, removing the usual cross-branch hot spots.
• Safe concurrent updates — a shared local lock, atomic file replacement, and current-content SHA-256 checks prevent silent overwrites.
• Explicit lifecycle — installing the plugin never initializes or migrates a repository.
• Agent-neutral state — all integrations use .echoes-vault/state.json; state is local and disposable, while Markdown remains the source of truth.
• Deterministic discovery — EchoesVault/index.md is generated from validated page metadata and is never edited as authored knowledge.
• Portable and inspectable — no network service, database, API key, or third-party Python package is required at runtime.

The complete implementer contract is in EchoesProtocol.md.

Requirements

• OpenCode >= 1.16.0
• Python >= 3.9 available as python3

If Python uses another executable name, set ECHOES_VAULT_PYTHON for the OpenCode process.

Installation

Via OpenCode UI

1. Press control + P.
2. Select Install plugin.
3. Enter echoes-vault-opencode.
4. Restart OpenCode.

Via configuration

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": ["echoes-vault-opencode"]
}

Plugin installation is intentionally read-only for the current repository. Initialize or migrate only the repositories where memory is wanted:

/echoes-init

Repository layout

<repository>/
├── EchoesVault/
│   ├── .echoes-vault.json       # tracked protocol marker
│   ├── AGENT_PROTOCOL.md        # tracked compact agent guide
│   ├── index.md                 # ignored deterministic view
│   ├── pages/                   # tracked curated knowledge
│   ├── daily/YYYY-MM-DD/        # tracked unique session entries
│   ├── assets/                  # tracked referenced assets
│   └── raw/                     # tracked source material
└── .echoes-vault/
    ├── echoes_vault.py          # tracked shared writer
    ├── state.json               # ignored local state
    └── lock                     # ignored local lock

Knowledge pages require this frontmatter:

---
type: architecture
stack: [typescript, python]
status: active
summary: OpenCode delegates all EchoesVault mutations to the shared project runtime.
---

The summary must be a non-empty single line of at most 160 characters.

Workflow

Initialize or migrate

/echoes-init

This is the only normal entry point that creates or migrates the vault. It installs the portable runtime, upgrades recognized legacy OpenCode commands and skills, imports compatible local session state, validates page metadata, and rebuilds the generated index. Unknown user-owned adapter files are preserved and reported for manual reconciliation.

Restore a session

/echoes-start

Loads the generated index and the three newest daily entries. It does not load the entire vault.

Inspect health

/echoes-status

Reports protocol, runtime, storage, metadata, conflicts, Git readiness, and scale. Status is strictly read-only and never initializes, migrates, hydrates, or repairs files.

Finalize a session

/echoes-end

Finalization is available only after this explicit user command. It writes one unique session summary and optional validated knowledge pages. Existing pages require a fresh SHA-256 obtained immediately before the update.

OpenCode tools

Tool	Purpose
echoes_activate_vault	Explicit initialization or migration after /echoes-init
echoes_start_session	Restore index and recent entries after /echoes-start
echoes_vault_status	Read-only health card
echoes_append_to_daily_log	Write one unique intermediate daily entry
echoes_search_vault_pages	Targeted search across curated pages
echoes_hash_vault_page	Get the current hash required for a page replacement
echoes_create_or_update_page	Validated page creation or hash-protected replacement
echoes_hydrate_vault	Rebuild only ignored local index/state files
commit_memory_to_echoes_vault	Explicit final session distillation after /echoes-end

Tools invoke Python as an argument array, send Markdown payloads over standard input, keep stdout and stderr separate, and propagate every non-zero runtime exit as a failed tool call.

Using the same vault from different computers

Commit durable protocol files, the portable runtime, pages, daily entries, assets, raw material, and managed agent adapters. Do not commit:

EchoesVault/index.md
.echoes-vault/state.json
.echoes-vault/lock
.opencode/echoes-state.json
.codex/echoes-vault-state.json

After cloning, /echoes-start hydrates the ignored index/state and restores context. Codex and OpenCode record their own lastWriter.agent and adapterVersion, but both use the same protocol, runtime, pages, and daily history.

The local lock coordinates processes in one checkout. Git still handles edits made in different clones. Unique daily files normally merge independently; edits to the same curated page require ordinary semantic conflict resolution.

Migrating from EchoesVault OpenCode 1.x

1. Install version 2 and restart OpenCode. Loading the plugin does not change the repository.
2. Run /echoes-status for a read-only preview. A legacy vault is reported as requiring migration.
3. Run /echoes-init explicitly.
4. Review the returned adapter and Git-readiness warnings.
5. Commit the durable files listed by the status card; untrack legacy local/generated files if requested by its suggested Git commands.

The migrator understands the old .opencode/echoes-state.json, flat daily logs, legacy index descriptions, and recognized EchoesVault commands/skills. It never silently overwrites unknown user-owned files.

Development

Development tests require Node >= 22.6 for native TypeScript execution.

npm install
npm test
npm run pack:check

npm test type-checks the server adapter, TUI, and tests, then runs bridge-level lifecycle, migration, write-safety, and runtime-integrity checks against the bundled reference runtime.

Updating

opencode plugin echoes-vault-opencode@X.X.X --force

Restart OpenCode after updating. A newer plugin may delegate to a newer compatible project runtime and will never downgrade it; project runtime changes happen only through explicit initialization or upgrade workflows.

License

MIT