Files

T

jason.woltje bb5cecb348 feat(adapters): adapter contract, dispatch, pi + mock adapters (#16 )

- 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

2026-09-02 21:18:07 -05:00

mock

feat(adapters): adapter contract, dispatch, pi + mock adapters (#16 )

2026-09-02 21:18:07 -05:00

feat(adapters): adapter contract, dispatch, pi + mock adapters (#16 )

2026-09-02 21:18:07 -05:00

README.md

feat(adapters): adapter contract, dispatch, pi + mock adapters (#16 )

2026-09-02 21:18:07 -05:00

README.md

Mosaic runtime adapters

An adapter is the entire harness-specific surface of the system. Everything upstream of an adapter — configuration, contracts, missions, tasks, run records — is harness-agnostic; everything inside an adapter may assume one specific agent runtime.

Contract

An adapter lives at:

/opt/mosaic/adapters/<name>/adapter.sh

and must be executable. The dispatcher (/opt/mosaic/src/run-agent.sh) selects it via MOSAIC_ADAPTER (default: pi) and execs it after the system prompt has been generated.

Inputs (environment):

Variable	Meaning
`MOSAIC_SYSTEM_PROMPT_FILE`	Absolute path to the generated system prompt (contracts + optional mission section). Read it; do not modify it.
`MOSAIC_REQUEST`	The exact user request text (may contain newlines).
`MOSAIC_PROVIDER`	Configured provider name.
`MOSAIC_MODEL`	Configured model id.

Optional, adapter-specific (documented per adapter):

Variable	Meaning
`MOSAIC_MOCK_RESPONSE`	mock only: the verbatim response to emit

Outputs:

stdout: the model response text — the only channel the orchestrator captures
stderr: diagnostics (never credentials)
exit 0: success; nonzero: failure

Rules

Adapters print ONLY the response on stdout. Status lines go to stderr.
Adapters never read configuration files; the resolved settings arrive via environment.
Adapters never write outside /var/lib/mosaic.
Adding an adapter requires: a new directory, the contract implementation, and adding the name to the allowlist in scripts/mosaic-config.mjs.

Included adapters

pi — the pinned @earendil-works/pi-coding-agent CLI in noninteractive print mode (-p), ambient discovery disabled, stdin detached.
mock — deterministic echo of MOSAIC_MOCK_RESPONSE. Test-only: never use it where a real model response is required.