ya-agent-environment
Environment abstractions for general agents.
ya-agent-environment provides the shared base interfaces used by YA agents:
EnvironmentFileOperatorShellResourceRegistry- resumable resources
- environment-owned temporary storage via
tmp_dirandresolve_tmp_path()
The Python import package is ya_agent_environment.
Environment and File Backend Contracts
Environment owns temporary-directory configuration and lifecycle. While entered,
env.tmp_dir exposes the agent-facing root (or None) and
env.resolve_tmp_path(relative_path) safely resolves a contained path, rejecting
absolute paths and parent traversal. Temporary paths are handled through the normal
FileOperator methods; there is no separate temporary-file operator or routing API.
Environment cleanup closes registered resources, the shell, and the file operator
before _teardown() releases backend/container and temporary-directory resources.
The same ordering is preserved after partial setup failures and during cancellation. The base class does not assume
a filesystem backing store and never deletes _tmp_dir itself: custom environments
must allocate their agent-facing temporary backend in _setup() and remove only owned
storage in _teardown().
A FileOperator implementation exposes one logical path space by implementing its
public abstract methods directly. read_bytes_stream() returns an AsyncIterator
directly, so consume the returned iterator without awaiting the method call.
Workspace-backed concrete environments allocate owned temporary instances below
.tmp/ya-agent-<id>. Each instance contains a self-ignoring .gitignore, and teardown
removes only that owned instance. Custom environments remain responsible for allocating
and tearing down their own temporary backend.
LocalFileOperator.walk_files() returns paths relative to default_path when possible
and directly reusable absolute paths for explicitly allowed roots outside it. glob and
grep may search those roots explicitly; root="." does not implicitly include
temporary storage.
Bounded Output
Shared output-bounding policy lives in ya_agent_environment.output. It provides
head/tail budget splitting, character and UTF-8 byte truncation, and incremental bounded
text accumulation. Shell ingestion and SDK previews should reuse these helpers instead
of defining independent truncation policies.
Shell Backend Contract
Custom Shell backends implement _create_process() and return an ExecutionHandle with stream, wait, and kill callbacks. Shell.execute() is the final public foreground boundary and must not be overridden: the base class owns process creation, timeout, cancellation, foreground/background registration, and session-reset cleanup. The foreground timeout budget begins before process creation, but shell-owned creation still resolves and terminates any eventual handle before reporting timeout. Class creation raises TypeError when final MRO resolution replaces execute(), so direct and mixin-based legacy overrides fail fast instead of silently bypassing lifecycle ownership; migrate their process creation into _create_process(). A wait callback must not report natural completion while owned descendants remain, and a kill callback must not return until backend execution is confirmed terminated; raising preserves the handle for a later reset retry. Backends must retain a stable execution identity through termination: a POSIX numeric PGID is no longer an ownership handle after its leader is reaped, so residual-group cleanup requires a live guardian or an equivalent platform-owned primitive.
Shell.start() returns a compact model-facing handle such as process-1. The handle is
sequential and unique within the current shell session; a successful
reset_background_processes() starts a fresh sequence. It is the only identifier
accepted by wait_process(), kill_process(), stdin, signal, status, and completion
APIs. It is not an OS PID, process-group ID, container exec identity, UUID, or durable
cross-session key. Those backend ownership identities remain private in
ExecutionHandle and transport-specific implementations. Foreground execution uses a
separate private identity and never consumes the model-facing sequence. A failed reset
retains both ownership state and the current sequence until termination is confirmed,
so a live handle is never reused.
Development
This package is maintained as a workspace member in ya-mono.
uv run python -m pytest packages/ya-agent-environment/tests -vv
uv run python -m pyright
uv build --package ya-agent-environment -o dist
1 maintainer
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