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refactor: remove legacy live-read and injected-history chat context paths (#26585)
This PR makes the agent-pushed pinned snapshot (`chat_context_resources`) the sole source of workspace context for chats, completing the "Release 5" cleanup. It removes legacy mechanisms now superseded by the snapshot that agents push over dRPC (`PushContextState`) and refresh via `chat-context/refresh`. Removed: - **Live-read at turn time.** MCP tool discovery, skill live-body reads, and the instruction/skill history fallback that dialed the workspace on every turn. - **Context injected as message history.** The `persist_workspace_context` generation action and its decision-loop guard. - **The legacy write path.** `POST`/`DELETE /api/v2/workspaceagents/me/experimental/chat-context`, the agentsdk `AddChatContext`/`ClearChatContext` methods, and the CLI one-shot writer. - **The `chats.last_injected_context` column** and all of its plumbing (migration `000529`, queries, `db2sdk`, `dbauthz`, audit table, and the frontend `ContextUsageIndicator` fallback). Subagent context inheritance no longer copies parent context messages; children now hydrate the parent's pinned `chat_context_resources` on create, which yields an identical pin for the same workspace and agent. What stays (still served by the live agent connection, not the snapshot): `read_skill_file` supporting-file reads, `read_skill` supporting-file listing, and MCP tool execution. > [!NOTE] > Migration `000529` drops `chats.last_injected_context` and recreates the `chats_expanded` view without it. The down migration restores both. <details> <summary>Decision log (D1-D5)</summary> - **D1 (subagent inheritance):** Re-point inheritance from the legacy message copy to a pinned hydrate. Children call `hydrateChatContextOnCreate` instead of copying parent context messages. - **D2 (`persist_workspace_context`):** Remove the generation action entirely along with the decision-loop guard it existed to satisfy, since context is never injected into history anymore. - **D3 (legacy HTTP + CLI):** Remove the experimental `chat-context` POST/DELETE endpoints, the agentsdk methods, and the CLI one-shot. The dRPC push + `chat-context/refresh` replace them. - **D4 (frontend fallback):** Remove the `last_injected_context` fallback in `ContextUsageIndicator`; pinned `resources` are the sole source. - **D5 (sequencing):** Ship as a single PR rather than a stacked pair. </details> --- Coder Agents generated on behalf of @kylecarbs.
This commit is contained in:
Kyle Carberry
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@@ -4787,7 +4787,6 @@ type Chat struct {
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AgentID uuid.NullUUID `db:"agent_id" json:"agent_id"`
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PinOrder int32 `db:"pin_order" json:"pin_order"`
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LastReadMessageID sql.NullInt64 `db:"last_read_message_id" json:"last_read_message_id"`
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LastInjectedContext pqtype.NullRawMessage `db:"last_injected_context" json:"last_injected_context"`
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DynamicTools pqtype.NullRawMessage `db:"dynamic_tools" json:"dynamic_tools"`
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OrganizationID uuid.UUID `db:"organization_id" json:"organization_id"`
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PlanMode NullChatPlanMode `db:"plan_mode" json:"plan_mode"`
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@@ -4977,36 +4976,35 @@ type ChatQueuedMessage struct {
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}
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type ChatTable struct {
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ID uuid.UUID `db:"id" json:"id"`
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OwnerID uuid.UUID `db:"owner_id" json:"owner_id"`
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WorkspaceID uuid.NullUUID `db:"workspace_id" json:"workspace_id"`
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Title string `db:"title" json:"title"`
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Status ChatStatus `db:"status" json:"status"`
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WorkerID uuid.NullUUID `db:"worker_id" json:"worker_id"`
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StartedAt sql.NullTime `db:"started_at" json:"started_at"`
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HeartbeatAt sql.NullTime `db:"heartbeat_at" json:"heartbeat_at"`
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CreatedAt time.Time `db:"created_at" json:"created_at"`
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UpdatedAt time.Time `db:"updated_at" json:"updated_at"`
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ParentChatID uuid.NullUUID `db:"parent_chat_id" json:"parent_chat_id"`
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RootChatID uuid.NullUUID `db:"root_chat_id" json:"root_chat_id"`
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LastModelConfigID uuid.UUID `db:"last_model_config_id" json:"last_model_config_id"`
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Archived bool `db:"archived" json:"archived"`
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LastError pqtype.NullRawMessage `db:"last_error" json:"last_error"`
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Mode NullChatMode `db:"mode" json:"mode"`
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MCPServerIDs []uuid.UUID `db:"mcp_server_ids" json:"mcp_server_ids"`
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Labels StringMap `db:"labels" json:"labels"`
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BuildID uuid.NullUUID `db:"build_id" json:"build_id"`
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AgentID uuid.NullUUID `db:"agent_id" json:"agent_id"`
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PinOrder int32 `db:"pin_order" json:"pin_order"`
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LastReadMessageID sql.NullInt64 `db:"last_read_message_id" json:"last_read_message_id"`
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LastInjectedContext pqtype.NullRawMessage `db:"last_injected_context" json:"last_injected_context"`
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DynamicTools pqtype.NullRawMessage `db:"dynamic_tools" json:"dynamic_tools"`
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OrganizationID uuid.UUID `db:"organization_id" json:"organization_id"`
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PlanMode NullChatPlanMode `db:"plan_mode" json:"plan_mode"`
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ClientType ChatClientType `db:"client_type" json:"client_type"`
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LastTurnSummary sql.NullString `db:"last_turn_summary" json:"last_turn_summary"`
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UserACL ChatACL `db:"user_acl" json:"user_acl"`
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GroupACL ChatACL `db:"group_acl" json:"group_acl"`
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ID uuid.UUID `db:"id" json:"id"`
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OwnerID uuid.UUID `db:"owner_id" json:"owner_id"`
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WorkspaceID uuid.NullUUID `db:"workspace_id" json:"workspace_id"`
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Title string `db:"title" json:"title"`
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Status ChatStatus `db:"status" json:"status"`
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WorkerID uuid.NullUUID `db:"worker_id" json:"worker_id"`
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StartedAt sql.NullTime `db:"started_at" json:"started_at"`
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HeartbeatAt sql.NullTime `db:"heartbeat_at" json:"heartbeat_at"`
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CreatedAt time.Time `db:"created_at" json:"created_at"`
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UpdatedAt time.Time `db:"updated_at" json:"updated_at"`
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ParentChatID uuid.NullUUID `db:"parent_chat_id" json:"parent_chat_id"`
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RootChatID uuid.NullUUID `db:"root_chat_id" json:"root_chat_id"`
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LastModelConfigID uuid.UUID `db:"last_model_config_id" json:"last_model_config_id"`
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Archived bool `db:"archived" json:"archived"`
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LastError pqtype.NullRawMessage `db:"last_error" json:"last_error"`
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Mode NullChatMode `db:"mode" json:"mode"`
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MCPServerIDs []uuid.UUID `db:"mcp_server_ids" json:"mcp_server_ids"`
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Labels StringMap `db:"labels" json:"labels"`
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BuildID uuid.NullUUID `db:"build_id" json:"build_id"`
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AgentID uuid.NullUUID `db:"agent_id" json:"agent_id"`
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PinOrder int32 `db:"pin_order" json:"pin_order"`
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LastReadMessageID sql.NullInt64 `db:"last_read_message_id" json:"last_read_message_id"`
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DynamicTools pqtype.NullRawMessage `db:"dynamic_tools" json:"dynamic_tools"`
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OrganizationID uuid.UUID `db:"organization_id" json:"organization_id"`
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PlanMode NullChatPlanMode `db:"plan_mode" json:"plan_mode"`
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ClientType ChatClientType `db:"client_type" json:"client_type"`
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LastTurnSummary sql.NullString `db:"last_turn_summary" json:"last_turn_summary"`
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UserACL ChatACL `db:"user_acl" json:"user_acl"`
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GroupACL ChatACL `db:"group_acl" json:"group_acl"`
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// Monotonic version for the full chat snapshot. Starts at 1 so stream loops and workers can use 0 to mean they have not loaded the chat yet.
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SnapshotVersion int64 `db:"snapshot_version" json:"snapshot_version"`
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// Snapshot version of the latest durable history change. Starts at 0 until chat_messages triggers set it to the current snapshot_version.
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