jason.woltje
bb5cecb348
- adapters/README.md: the harness boundary contract (env in, response on stdout, diagnostics stderr, exit 0 success) - adapters/pi: extracted current invocation unchanged - adapters/mock: deterministic MOSAIC_MOCK_RESPONSE echo (test-only) - run-agent.sh: name-validated dispatch to adapters/<name>/adapter.sh - config: optional execution.adapter (pi|mock), default pi, configVersion stays 1 — existing configs remain valid; selection authority is the config file (load_config exports it) - compose: MOSAIC_ADAPTER / MOSAIC_MOCK_RESPONSE passthrough; Containerfile installs adapters read-only; RELEASE -> 0.0.5 Verified: hello unchanged; mock verbatim via config; unknown adapter and path-traversal names refused in-container; invalid adapter exits 2. Closes #16
55 lines
1.9 KiB
Markdown
55 lines
1.9 KiB
Markdown
# Mosaic runtime adapters
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An adapter is the entire harness-specific surface of the system. Everything
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upstream of an adapter — configuration, contracts, missions, tasks, run
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records — is harness-agnostic; everything inside an adapter may assume one
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specific agent runtime.
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## Contract
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An adapter lives at:
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```text
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/opt/mosaic/adapters/<name>/adapter.sh
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```
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and must be executable. The dispatcher (`/opt/mosaic/src/run-agent.sh`)
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selects it via `MOSAIC_ADAPTER` (default: `pi`) and execs it after the
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system prompt has been generated.
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**Inputs (environment):**
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| Variable | Meaning |
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| `MOSAIC_SYSTEM_PROMPT_FILE` | Absolute path to the generated system prompt (contracts + optional mission section). Read it; do not modify it. |
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| `MOSAIC_REQUEST` | The exact user request text (may contain newlines). |
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| `MOSAIC_PROVIDER` | Configured provider name. |
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| `MOSAIC_MODEL` | Configured model id. |
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Optional, adapter-specific (documented per adapter):
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| Variable | Meaning |
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| `MOSAIC_MOCK_RESPONSE` | mock only: the verbatim response to emit |
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**Outputs:**
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- `stdout`: the model response text — the only channel the orchestrator captures
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- `stderr`: diagnostics (never credentials)
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- exit `0`: success; nonzero: failure
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## Rules
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1. Adapters print ONLY the response on stdout. Status lines go to stderr.
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2. Adapters never read configuration files; the resolved settings arrive via environment.
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3. Adapters never write outside `/var/lib/mosaic`.
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4. Adding an adapter requires: a new directory, the contract implementation, and
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adding the name to the allowlist in `scripts/mosaic-config.mjs`.
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## Included adapters
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- `pi` — the pinned `@earendil-works/pi-coding-agent` CLI in noninteractive
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print mode (`-p`), ambient discovery disabled, stdin detached.
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- `mock` — deterministic echo of `MOSAIC_MOCK_RESPONSE`. Test-only: never use
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it where a real model response is required.
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