agent-memory-systems-postgres

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Persistent shared memory for AI agents backed by PostgreSQL (fts + pg_trgm, optional pgvector). Includes compaction logging and maintenance scripts.

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Sourcearthur0824hao/skills

Added on2026-02-10

NPX Install

npx skill4agent add arthur0824hao/skills agent-memory-systems-postgres

SKILL.md Content

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Agent Memory Systems (PostgreSQL)

Persistent shared memory for all AI agents. PostgreSQL 14+ on Linux or Windows. Memory failures look like intelligence failures — this skill ensures the right memory is retrieved at the right time.

Quick Start

Database

agent_memory

and all functions are created by

init.sql

in this skill directory.

bash

# Linux
psql -U postgres -c "CREATE DATABASE agent_memory;"
psql -U postgres -d agent_memory -f init.sql

# Windows (adjust path to your psql.exe)
& "C:\Program Files\PostgreSQL\18\bin\psql.exe" -U postgres -c "CREATE DATABASE agent_memory;"
& "C:\Program Files\PostgreSQL\18\bin\psql.exe" -U postgres -d agent_memory -f init.sql

Verify:

SELECT * FROM memory_health_check();

Pure Skill Mode (default)

This skill works without installing any plugin. In pure skill mode:

you manually run scripts when you want (progressive disclosure)
no global OpenCode config is modified automatically

Optional bootstrap (asks + records choices + tries to install)

Notes:

Interactive mode defaults to NOT installing heavy optional components.
Use
```
-InstallAll
```
/
```
--install-all
```
only when you're ready to install everything.

Run the bootstrap script to choose optional components (pgpass, local embeddings, pgvector) and record decisions.

Windows:

powershell

# run from the skill directory
powershell.exe -NoProfile -ExecutionPolicy Bypass -File "scripts\bootstrap.ps1"

Linux/macOS:

bash

# run from the skill directory
bash "scripts/bootstrap.sh"

The selection record is stored at:

~/.config/opencode/agent-memory-systems-postgres/setup.json

Agent rule:

If this file does not exist, ask the user if they want to enable optional components.
Recommended: run bootstrap with all options enabled (then fix any failures it reports).

On Windows, pgvector installation follows the official pgvector instructions (Visual Studio C++ +

nmake /F Makefile.win

). The bootstrap will attempt to install prerequisites via

winget

Optional automation: compaction logging (OpenCode plugin)

If you want automatic compaction logging, install the OpenCode plugin template shipped with this skill.

Copy

plugins/agent-memory-systems-postgres.js

~/.config/opencode/plugins/

Restart OpenCode

Credentials (psql)

Do NOT hardcode passwords in scripts, skill docs, or config files.

Recommended options for non-interactive

psql

.pgpass

pgpass.conf

(recommended)

Linux/macOS:
```
~/.pgpass
```
(must be
```
chmod 0600 ~/.pgpass
```
or libpq will ignore it)

Windows:

%APPDATA%\postgresql\pgpass.conf

(example:

C:\Users\<you>\AppData\Roaming\postgresql\pgpass.conf

)

Format:

hostname:port:database:username:password

Docs: https://www.postgresql.org/docs/current/libpq-pgpass.html

```
PGPASSFILE
```
(optional override): point to a custom location for the password file
```
PGPASSWORD
```
(not recommended): only for quick local testing; environment variables can leak on some systems
- Docs: https://www.postgresql.org/docs/current/libpq-envars.html

Tip: set connection defaults once (per shell) to shorten commands:

bash

export PGHOST=localhost
export PGPORT=5432
export PGDATABASE=agent_memory
export PGUSER=postgres

One-time setup helper scripts

This skill ships helper scripts (relative paths):

```
scripts/setup-pgpass.ps1
```
```
scripts/setup-pgpass.sh
```

OpenCode usage: run them from the skill directory.

Windows run:

powershell

powershell.exe -NoProfile -ExecutionPolicy Bypass -File "scripts\setup-pgpass.ps1"

Linux/macOS run:

bash

bash "scripts/setup-pgpass.sh"

Memory Types

Type	Lifespan	Use When
`working`	24h auto-expire	Current conversation context (requires `session_id` )
`episodic`	Permanent + decay	Problem-solving experiences, debugging sessions
`semantic`	Permanent	Extracted facts, knowledge, patterns
`procedural`	Permanent	Step-by-step procedures, checklists (importance >= 7)

Core Functions

store_memory(type, category, tags[], title, content, metadata, agent_id, session_id, importance)

Auto-deduplicates by content hash. Duplicate inserts bump

access_count

and

importance_score

sql

SELECT store_memory(
    'semantic',
    'windows-networking',
    ARRAY['ssh', 'tunnel', 'port-conflict'],
    'SSH Tunnel Port Conflict Resolution',
    'Fix: 1) taskkill /F /IM ssh.exe  2) Use processId not pid  3) Wait 3s',
    '{"os": "Windows 11"}',
    'sisyphus',
    NULL,
    9.0
);

search_memories(query, types[], categories[], tags[], agent_id, min_importance, limit)

Hybrid search: full-text (tsvector) + trigram similarity (pg_trgm) + tag filtering. Accepts plain English queries — no tsquery syntax needed. Relevance scoring:

text_score * decay * recency * importance

sql

-- Natural language
SELECT * FROM search_memories('ssh tunnel port conflict', NULL, NULL, NULL, NULL, 7.0, 5);

-- Filter by type + tags
SELECT * FROM search_memories(
    'troubleshooting steps',
    ARRAY['procedural']::memory_type[],
    NULL,
    ARRAY['ssh'],
    NULL, 0.0, 5
);

Returns:

id, memory_type, category, title, content, importance_score, relevance_score, match_type

Where

match_type

is one of:

fulltext

trigram_title

trigram_content

metadata

memory_health_check()

Returns:

metric | value | status

for

total_memories

avg_importance

stale_count

apply_memory_decay()

Decays episodic memories by

0.9999^days_since_access

. Run daily.

prune_stale_memories(age_days, max_importance, max_access_count)

Soft-deletes old episodic memories below thresholds. Default: 180 days, importance <= 3, never accessed.

Agent Workflow

Before a task

sql

SELECT id, title, content, relevance_score
FROM search_memories('keywords from user request', NULL, NULL, NULL, NULL, 5.0, 5);

If relevant memories found, reference them: "Based on past experience (memory #1)..."

After solving a problem

sql

SELECT store_memory(
    'semantic',
    'category-name',
    ARRAY['tag1', 'tag2', 'tag3'],
    'One-line problem summary',
    'Detailed problem + solution',
    '{"os": "...", "tools": [...]}',
    'agent-name',
    NULL,
    8.0
);

When delegating to subagents

Include in prompt:

MUST DO FIRST:
  Search agent_memories: SELECT * FROM search_memories('relevant keywords', NULL, NULL, NULL, NULL, 5.0, 5);

MUST DO AFTER:
  If you solved something new, store it with store_memory(...)

Task Memory Layer (optional)

This skill also ships a minimal task/issue layer inspired by Beads: graph semantics + deterministic "ready work" queries.

Objects:

```
agent_tasks
```
: tasks (status, priority, assignee)
```
task_links
```
: typed links (
```
blocks
```
,
```
parent_child
```
,
```
related
```
, etc.)
```
blocked_tasks_cache
```
: materialized cache to make ready queries fast
```
task_memory_links
```
: link tasks to memories (
```
agent_memories
```
) for outcomes/notes

Create tasks:

sql

INSERT INTO agent_tasks(title, description, created_by, priority)
VALUES ('Install pgvector', 'Windows build + enable extension', 'user', 1);

Add dependencies:

sql

-- Task 1 blocks task 2
INSERT INTO task_links(from_task_id, to_task_id, link_type)
VALUES (1, 2, 'blocks');

-- Task 2 is parent of task 3 (used for transitive blocking)
INSERT INTO task_links(from_task_id, to_task_id, link_type)
VALUES (2, 3, 'parent_child');

Rebuild blocked cache (usually auto via triggers):

sql

SELECT rebuild_blocked_tasks_cache();

Ready work query:

sql

SELECT id, title, priority
FROM agent_tasks t
WHERE t.deleted_at IS NULL
  AND t.status IN ('open','in_progress')
  AND NOT EXISTS (SELECT 1 FROM blocked_tasks_cache b WHERE b.task_id = t.id)
ORDER BY priority ASC, updated_at ASC
LIMIT 50;

Claim a task (atomic):

sql

SELECT claim_task(2, 'agent-1');

Link a task to a memory:

sql

INSERT INTO task_memory_links(task_id, memory_id, link_type)
VALUES (2, 123, 'outcome');

Optional add-on:

conditional_blocks

(not implemented yet)

This is intentionally deferred until the core workflow feels solid.
If you need it now, store a condition in
```
task_links.metadata
```
(e.g.,
```
{ "os": "windows" }
```
) and treat it as documentation.

Wrapper scripts (recommended)

To avoid re-typing SQL, use the wrapper scripts shipped with this skill:

Windows:

powershell

powershell.exe -NoProfile -ExecutionPolicy Bypass -File "scripts\tasks.ps1" ready 50
powershell.exe -NoProfile -ExecutionPolicy Bypass -File "scripts\tasks.ps1" create "Install pgvector" 1
powershell.exe -NoProfile -ExecutionPolicy Bypass -File "scripts\tasks.ps1" claim 2 agent-1

Linux/macOS:

bash

bash "scripts/tasks.sh" ready 50
bash "scripts/tasks.sh" create "Install pgvector" 1
bash "scripts/tasks.sh" claim 2 agent-1

Compaction Log (high value)

Compaction can delete context. Treat every compaction as an important event and record it.

If you're using OpenCode, prefer the OpenCode plugin route for automatic compaction logging.

OpenCode plugin (experimental.session.compacting)

Copy

plugins/agent-memory-systems-postgres.js

~/.config/opencode/plugins/

Restart OpenCode

It writes local compaction events to:

~/.config/opencode/agent-memory-systems-postgres/compaction-events.jsonl

And will also attempt a best-effort Postgres

store_memory(...)

write (requires pgpass).

Verify

sql

SELECT id, title, relevance_score
FROM search_memories('compaction', NULL, NULL, NULL, NULL, 0, 10);

If nothing is inserted, set up

.pgpass

pgpass.conf

psql

can authenticate without prompting.

Daily Compaction Consolidation

Raw compaction events are noisy. Run a daily consolidation job that turns many compaction events into 1 daily memory.

The consolidation scripts default to the OpenCode plugin event log path and will fall back to Claude Code paths if needed.

OpenCode events:

~/.config/opencode/agent-memory-systems-postgres/compaction-events.jsonl

Output directory:

~/.config/opencode/agent-memory-systems-postgres/compaction-daily/

Windows run (manual):

powershell

powershell.exe -NoProfile -ExecutionPolicy Bypass -File "scripts\consolidate-compactions.ps1"

Linux/macOS run (manual):

bash

bash "scripts/consolidate-compactions.sh"

Scheduling:

Windows Task Scheduler: create a daily task that runs the PowerShell command above
Linux cron example:

bash

# every day at 02:10 UTC
10 2 * * * bash "<skill-dir>/scripts/consolidate-compactions.sh" >/dev/null 2>&1

Appendix: Claude Code compatibility (optional)

This repository also includes Claude Code hook scripts under

hooks/

. They are not required for OpenCode usage.

Friction Log (turn pain into tooling)

Whenever something is annoying, brittle, or fails:

Store an
```
episodic
```
memory with category
```
friction
```
and tags for the tool/OS/error.
If it repeats (2+ times), promote it to
```
procedural
```
memory (importance >= 7) with a checklist.
Update this skill doc when the fix becomes a stable rule/workflow (so every agent learns it).

Schema Overview

agent_memories
— Main table. Full-text search, trigram indexes, JSONB metadata, soft-delete. memory_links
— Graph relationships (references, supersedes, contradicts). working_memory
— Ephemeral session context with auto-expire.

Key columns:

memory_type

category

tags[]

title

content

content_hash

(auto),

metadata

(JSONB),

importance_score

access_count

relevance_decay

search_vector

(auto).

Anti-Patterns

Don't	Do Instead
Store everything	Only store non-obvious solutions
Skip tags	Tag comprehensively: tech, error codes, platform
Use `to_tsquery` directly	`search_memories()` handles this via `plainto_tsquery`
One type for all data	Use correct memory_type per content
Forget importance rating	Rate honestly: 9-10 battle-tested, 5-6 partial

Sharp Edges

Issue	Severity	Mitigation
Chunks lose context	Critical	Store full problem+solution as one unit
Old tech memories	High	`apply_memory_decay()` daily; prune stale
Duplicate memories	Medium	`store_memory()` auto-deduplicates by content_hash
No vector search	Info	pg_trgm provides fuzzy matching; pgvector can be added later

Cross-Platform Notes

PostgreSQL 14-18 supported (no partitioning, no GENERATED ALWAYS)
pg_trgm is the only required extension (ships with all PG distributions)

Linux:

psql -U postgres -d agent_memory -f init.sql

Windows: Use full path to psql.exe or add PG bin to PATH
MCP postgres_query: Works for read operations; DDL requires psql

Maintenance

sql

SELECT apply_memory_decay();                         -- daily
SELECT prune_stale_memories(180, 3.0, 0);            -- monthly
DELETE FROM working_memory WHERE expires_at < NOW();  -- daily
SELECT * FROM memory_health_check();                  -- anytime

Optional: pgvector Semantic Search

If pgvector is installed on your PostgreSQL server,

init.sql

will:

create extension
```
vector
```
(non-fatal if missing)
add
```
agent_memories.embedding vector
```
(variable dimension)

create

search_memories_vector(p_embedding, p_embedding_dim, ...)

Notes:

This does NOT generate embeddings. You must populate
```
agent_memories.embedding
```
yourself.
Once embeddings exist, you can do nearest-neighbor search:

sql

-- p_embedding is a pgvector literal; pass it from your app.
-- Optionally filter by dimension (recommended when using multiple models).
SELECT id, title, similarity
FROM search_memories_vector('[0.01, 0.02, ...]'::vector, 768, NULL, NULL, NULL, NULL, 0.0, 10);

Note: variable-dimension vectors cannot be indexed with pgvector indexes. This is a tradeoff to support local models with different embedding sizes.

If pgvector is not installed, everything else still works (fts + pg_trgm).

Embedding Ingestion Pipeline

pgvector search only works after you populate

agent_memories.embedding

This skill ships ingestion scripts (relative paths). Run from the skill directory:

```
scripts/ingest-embeddings.ps1
```
```
scripts/ingest-embeddings.sh
```

They:

find memories with
```
embedding IS NULL
```
call an OpenAI-compatible embeddings endpoint (including Ollama)
write vectors into
```
agent_memories.embedding vector
```

Requirements:

pgvector installed +
```
init.sql
```
applied (so
```
agent_memories.embedding
```
exists)
```
.pgpass
```
/
```
pgpass.conf
```
configured (so
```
psql -w
```
can write without prompting)
env vars for embedding API:
- ```
EMBEDDING_PROVIDER
```
  (
```
ollama
```
  or
```
openai
```
  ; default
```
openai
```
  )
- ```
EMBEDDING_API_KEY
```
  (required for
```
openai
```
  ; optional for
```
ollama
```
  )
- ```
EMBEDDING_API_URL
```
  (default depends on provider)
- ```
EMBEDDING_MODEL
```
  (default depends on provider)
- ```
EMBEDDING_DIMENSIONS
```
  (optional; forwarded to the embeddings endpoint when supported)

Windows example:

powershell

$env:EMBEDDING_PROVIDER = "ollama"
$env:EMBEDDING_MODEL = "nomic-embed-text"
powershell.exe -NoProfile -ExecutionPolicy Bypass -File "scripts\ingest-embeddings.ps1" -Limit 25

Linux/macOS example:

bash

export EMBEDDING_API_KEY=...
export EMBEDDING_MODEL=text-embedding-3-small
bash "scripts/ingest-embeddings.sh"

Scheduling:

run daily (or hourly) after you add new memories
keep
```
Limit
```
small until you trust it

Robustness note:

On Windows, very long SQL strings can be fragile when passed via
```
psql -c
```
. The ingestion script writes per-row updates to a temporary
```
.sql
```
file and runs
```
psql -f
```
to avoid command-line length/quoting edge cases.

Related Skills

systematic-debugging

postgres-pro

postgresql-table-design

agent-memory-systems-postgres

NPX Install

Tags

SKILL.md Content

Agent Memory Systems (PostgreSQL)

Quick Start

Pure Skill Mode (default)

Optional bootstrap (asks + records choices + tries to install)

Optional automation: compaction logging (OpenCode plugin)

Credentials (psql)

One-time setup helper scripts

Memory Types

Core Functions

`store_memory(type, category, tags[], title, content, metadata, agent_id, session_id, importance)`

`search_memories(query, types[], categories[], tags[], agent_id, min_importance, limit)`

`memory_health_check()`

`apply_memory_decay()`

`prune_stale_memories(age_days, max_importance, max_access_count)`

Agent Workflow

Before a task

After solving a problem

When delegating to subagents

Task Memory Layer (optional)

Wrapper scripts (recommended)

Compaction Log (high value)

OpenCode plugin (experimental.session.compacting)

Verify

Daily Compaction Consolidation

Appendix: Claude Code compatibility (optional)

Friction Log (turn pain into tooling)

Schema Overview

Anti-Patterns

Sharp Edges

Cross-Platform Notes

Maintenance

Optional: pgvector Semantic Search

Embedding Ingestion Pipeline

Related Skills