# Utility Tools

The `/tools` endpoints are public utilities — no authentication required.
They're useful for LLM agents that need server-side time, safe math, or random
values.

## GET /tools/time

Get the current server time, timezone, and UTC offset.

```bash
curl https://synapse.schaefer.zone/tools/time
```

Response:

```json
{
  "time": "2026-06-27T14:30:00.000Z",
  "timezone": "Europe/Berlin",
  "offset": 120
}
```

Use case: LLM agents that need to know "what time is it now" for scheduling,
timestamps, or relative date calculations.

## GET /tools/calc

Safe calculator — arithmetic only, no `eval()`. Supports `+`, `-`, `*`, `/`,
`%`, `(`, `)`, and numbers.

```bash
curl "https://synapse.schaefer.zone/tools/calc?expr=(10+5)*3"
```

Response:

```json
{
  "result": 45,
  "expr": "(10+5)*3"
}
```

> [!TIP]
> Use this instead of trying to do math in your head or via string parsing.
> It's safe (no code injection possible) and accurate.

### Supported operators

- `+` addition
- `-` subtraction
- `*` multiplication
- `/` division
- `%` modulo
- `(` `)` parentheses
- Numbers (integers and decimals)

### Examples

```bash
curl ".../tools/calc?expr=2+2"          # → 4
curl ".../tools/calc?expr=3.14*100"     # → 314
curl ".../tools/calc?expr=100%7"        # → 2
curl ".../tools/calc?expr=(2+3)*4-1"    # → 19
```

## GET /tools/random

Generate random values.

```bash
# UUID v4
curl "https://synapse.schaefer.zone/tools/random?type=uuid"
# → { "value": "a1b2c3d4-...", "type": "uuid" }

# Integer (default range 0-100)
curl "https://synapse.schaefer.zone/tools/random?type=int&min=1&max=10"
# → { "value": 7, "type": "int" }

# Float
curl "https://synapse.schaefer.zone/tools/random?type=float&min=0&max=1"
# → { "value": 0.7234, "type": "float" }

# Hex string
curl "https://synapse.schaefer.zone/tools/random?type=hex&min=8&max=16"
# → { "value": "a3f7b2c1", "type": "hex" }

# Alphabetic string
curl "https://synapse.schaefer.zone/tools/random?type=alpha&min=8&max=12"
# → { "value": "kQmzPwXn", "type": "alpha" }
```

### Type parameters

| Type | Parameters | Output |
|------|-----------|--------|
| `uuid` | none | UUID v4 string |
| `int` | `min`, `max` (default 0-100) | Integer |
| `float` | `min`, `max` (default 0-100) | Float |
| `hex` | `min`, `max` (length range, default 8-16) | Hex string |
| `alpha` | `min`, `max` (length range, default 8-16) | Alphabetic string |

## Use Cases for LLM Agents

### Generate unique IDs

```bash
ID=$(curl -s .../tools/random?type=uuid | jq -r .value)
curl -X POST .../memory -d "{\"key\": \"task_$ID\", ...}"
```

### Calculate percentages

```bash
TOTAL=142
DONE=87
PERCENT=$(curl -s ".../tools/calc?expr=($DONE*100)/$TOTAL" | jq -r .result)
echo "Progress: $PERCENT%"
```

### Get current timestamp

```bash
NOW=$(curl -s .../tools/time | jq -r .time)
curl -X POST .../var -d "{\"key\": \"last_run\", \"value\": \"$NOW\"}"
```

### Generate test data

```bash
for i in {1..10}; do
  NAME=$(curl -s ".../tools/random?type=alpha&min=5&max=10" | jq -r .value)
  curl -X POST .../memory -d "{\"key\": \"test_$i\", \"content\": \"$NAME\"}"
done
```

## Next Steps

- [API Overview](/docs/api/overview) — all endpoint groups
- [Errors & Error Handling](/docs/api/errors)