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promptkit/docs/releases/v0.9.0.md

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# Promptkit v0.9.0
This supplemental changelog and migration guide summarizes the consumer-facing
changes from `v0.8.0` to `v0.9.0`. The annotated `v0.9.0` tag is the
authoritative release record. Exact current contracts belong to the linked
GoDoc and durable documentation.
## Summary
`v0.9.0` adds stateless request-message composition and separates maintained
provider data from Promptkit's core implementation:
- callers can append already-rendered messages to a configured prompt for
application-owned conversations and semantic correction workflows;
- the public package now publishes constants for the four supported text-chat
roles, and prompt definitions use the same normalized role vocabulary; and
- the OpenRouter and Rakestrawhome backend/profile catalogs now come from two
independently versioned Go module dependencies.
## Compatibility
This release adds one field and four constants to the public API and removes no
public declarations. Existing keyed `RunRequest` literals that omit
`AppendedMessages` retain their behavior. Adding the field changes the struct
shape, so consumers using positional `RunRequest` literals must convert them
to keyed literals.
Message roles in prompt definitions are now trimmed, lowercased, and required
to be `developer`, `system`, `user`, or `assistant`. Definitions using another
role that earlier releases accepted as an arbitrary nonblank string now fail
prompt loading. In particular, the text-only message contract does not support
`tool` or the deprecated `function` role. Otherwise valid roles with different
case or surrounding whitespace are normalized rather than rejected.
The catalog extraction preserves Promptkit's public API, built-in backend and
profile IDs, configuration, precedence, credential handling, and capacity
behavior. Consumers do not import or register either catalog themselves, and
no configuration migration is required. Promptkit now selects two
independently versioned data dependencies and guarantees only the catalog
versions selected and tested by this Promptkit release.
## Upgrade
Update the module dependency with:
```sh
go get gitea.maximumdirect.net/eric/promptkit@v0.9.0
go mod tidy
```
Convert any positional `RunRequest` literals to keyed literals. Review prompt
definitions for unsupported roles, then run the consuming project's ordinary
and race-enabled tests.
## Appended Request Messages
`RunRequest.AppendedMessages` accepts caller-owned `RenderedMessage` values
that Promptkit validates, copies, and appends after every rendered
prompt-definition message in caller order. Promptkit does not template this
content, retain conversation state between calls, impose a retry policy, or
apply a message-count, byte-size, token, or context-window limit. Upstream
rejections continue through the ordinary generation-error boundary.
This primitive supports application-owned conversation continuations and
domain-aware correction loops while preserving Promptkit's existing
preparation, hashing, prepared-execution, structural repair, backend-capacity,
credential, and cancellation behavior. Appended content can include sensitive
model output or application feedback; prepared values expose the complete
effective messages by design, while default request formatting reports only
the appended-message count.
See the
[consumer appended-message example](../consumers/pkg-promptkit.md#append-already-rendered-messages),
the [`RunRequest`, `RenderedMessage`, and `CacheControl` GoDoc](../../types.go),
and the [OpenAI-compatible request contract](../integrations/openai-compatible-chat.md#request-body)
for current behavior.
## Supported Message Roles
The new `RoleDeveloper`, `RoleSystem`, `RoleUser`, and `RoleAssistant`
constants identify the complete role vocabulary accepted by Promptkit's
text-chat message model. The same validation and normalization now apply to
prompt-definition messages and request-supplied appended messages. Promptkit
does not translate between roles; provider- or model-specific rejection of an
otherwise supported role remains an upstream generation error.
See the [message format reference](../formats.md#messages-and-templates) for
the canonical prompt-definition contract.
## Independently Versioned Backend Catalogs
Promptkit imports immutable catalog data for its maintained OpenRouter and
Rakestrawhome backends and profiles. Engine construction validates and
assembles both catalogs behind the existing built-in registry and profile
precedence rules. Promptkit no longer keeps duplicate embedded profile assets
or hard-coded definitions for those maintained backends.
The module versions in Promptkit's `go.mod` identify the catalog releases
tested with this release. The [built-in backend and profile format
reference](../formats.md#built-in-backends) remains the canonical consumer
contract, while the [internal source documentation](../internal/sources.md#profiles-and-built-ins)
describes the dependency boundary.
## Public API Changes
The release adds:
- `RunRequest.AppendedMessages`;
- `RoleDeveloper`;
- `RoleSystem`;
- `RoleUser`; and
- `RoleAssistant`.
No public declaration was removed.
## Consumer Action
- Convert positional `RunRequest` literals to keyed literals.
- Replace unsupported prompt-definition roles with an appropriate supported
role, or keep richer tool-call protocols in an application-owned client.
- Treat appended messages and prepared effective messages according to the
application's sensitive-data policy.
- Do not add direct catalog imports or registration calls; existing Promptkit
construction and configuration remain correct.
- Run consumer ordinary and race-enabled tests after updating the module.