# Dynamic mode and linking conduits

<sub>**Intermediate.** Everything above works without this. Turn it on when
separate parts of your system need to share.</sub>

By default a world is **static** — bind, conjure, resolve. Turn on dynamic mode
and conduits gain the ability to connect to each other at runtime.

**Prerequisites for the excerpts below:** use a fresh process; create
`owner_book` and `borrower_book`, define `SharedDirectory`, and capture its
`spell_id` from `owner_book.bind(...)` before conjuring. The complete
[dynamic-linking lesson](https://github.com/Synaptic724/melder/blob/prod/UX_and_AIX_experiences/02_intermediate/21_dynamic_linking_basics.py)
includes all of that setup and prints the provider's `found` result.

The mode is decided **once, by the first conjure**, and then inherited:

```python
# SETTLEMENT — the first conjure on a fresh world sets the mode, and it locks
owner = owner_book.conjure(dynamic=True, name="owner")

# INHERITANCE — later books just attach; a plain conjure() inherits the mode.
# You never repeat the flag.
borrower = borrower_book.conjure(name="borrower")
```

Now link them and share a spell across the boundary:

```python
owner.link(borrower)                       # open a contract between the two

borrower.add_spell_to_contract(            # ← the BORROWER asks
    spell_id=spell_id,
    conduit=owner,                         # ← from the conduit that OWNS it
    permissions="create",
)

shared = borrower.meld("SharedDirectory")   # resolves the owner's spell
```

Expected outcome: the borrower resolves the registered provider after linking
and pulling its spell into the contract. The link alone does not grant it.

**Sharing is a pull, never a push.** The conduit that wants the spell asks for
it, and names the owner. An owner cannot force its objects into someone else's
scope — so nothing arrives in your conduit that you didn't request.

## Runnable examples

- [Dynamic linking basics](../examples/intermediate/21-dynamic-linking-basics.md) — Intermediate 21
- [Permissions linking vocabulary](../examples/intermediate/11-permissions-linking-vocabulary.md) — Intermediate 11

[All intermediate examples](../examples/intermediate/index.md) · [Level contents](index.md) · [Full contents](../contents.md)

[Canonical page source](https://github.com/Synaptic724/melder/blob/0895ce795453cd87e35d70665957b4e89aad3317/README.md)