dckcandClaude Opus 5.5
efb54ad4cc
The story behind good-fences: lend a governed mower over the fence to a neighbor whose tenants are model-written code, with the design IBIS worked out so far. Previously an untracked note at the workspace root. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
64 lines
2.2 KiB
Markdown
64 lines
2.2 KiB
Markdown
# Lend the mower
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The journey from [Good Fences Make Good Agents](../../docs/good-fences-make-good-agents.md): I lend
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my neighbor a governed mower; the neighbor's tenant, a little tipsy,
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pushes it until the fence stops it. The design decisions behind each actor are in that
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doc's Design IBIS (numbers in parentheses below).
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Actors, by authority:
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- **fence page**, **js playground**, **governed mower**, and **yard** run
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in my browser (3a, 8b, 6b).
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- **Mower factory** trades a webkey for a mower (3b-ii); each **mower DO**
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is given the yard and cuts the cells it enters (6a, 6d).
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- The **neighbor's harness** holds the things I send and shows the
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**model** only their `about` (1b, 2a); it runs the model's code as a
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**tenant**, endowed with the things (2c, 5a).
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The yard is 8×8 here and the fence is 2 cells, to keep the diagram short
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(the story's 10 cells is 6c). The mower starts at (4, 4), facing north.
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## Lend a governed mower to a tipsy tenant
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```mermaid
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sequenceDiagram
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%% ->> is my action at the fence page; -->> is a call or reply it causes.
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participant F as fence page
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participant MF as Mower factory
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participant P as js playground
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participant G as governed mower
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participant M as mower DO
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participant Y as yard
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participant N as neighbor's harness
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participant L as model
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participant TL as tenant loader
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participant T as tenant
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F->>F: lend({ webkey: 'mower-key', limit: 2, say })
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F-->>MF: mower('mower-key')
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MF-->>F: mower
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F-->>P: govern(mower, 2)
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P-->>F: governed
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F-->>N: chat({ role, content, things: { mower: governed }, about: { mower: { ts } } })
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N-->>L: complete([{ role, content, about: { mower: { ts } } }])
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L-->>N: code
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N-->>TL: load(code, { mower: governed })
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TL-->>N: tenant
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N-->>T: run()
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T-->>G: start()
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G-->>M: start()
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M-->>Y: cut(4, 4)
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T-->>G: push()
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G-->>M: push()
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M-->>Y: cut(4, 3)
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T-->>G: push()
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G-->>M: push()
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M-->>Y: cut(4, 2)
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T-->>G: push()
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G-->>T: throws 'fence: 2 cells from start'
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T-->>N: 'fence: 2 cells from start'
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N-->>F: 'fence: 2 cells from start'
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```
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The model never sees the mower itself, only `about.mower`. The third
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`push()` never reaches the mower DO: the governor refuses it (7b).
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