Context Engine (context) API

Table of Contents

• upsquad/context/v1/context.proto

  • AssembleContextRequest

  • AssembleContextRequest.HintsEntry

  • AssembleContextResponse

  • CompactRequest

  • CompactResponse

  • CreateShareRequest

  • CreateShareResponse

  • CreateSnapshotRequest

  • CreateSnapshotResponse

  • EmbedRequest

  • EmbedResponse

  • EmbeddingVector

  • GuardrailLayer

  • IngestEventRequest

  • IngestEventRequest.MetadataEntry

  • IngestEventResponse

  • ListSharesRequest

  • ListSharesResponse

  • PullContextRequest

  • PullContextResponse

  • PullContextResponse.MetadataEntry

  • PushContextRequest

  • PushContextRequest.MetadataEntry

  • PushContextResponse

  • QualityAttestation

  • ResolveGuardrailLayersRequest

  • ResolveGuardrailLayersResponse

  • RevokeShareRequest

  • RevokeShareResponse

  • RollbackContextRequest

  • RollbackContextResponse

  • ScopePath

  • SearchRequest

  • SearchResponse

  • SearchResult

  • SearchResult.MetadataEntry

  • ShareGrant

  • ValidatePromptRequest

  • ValidatePromptResponse

  • ContextEngine

• upsquad/context/v1/stream.proto

  • AuditAccessEvent
  • BaselineMetricEvent
  • CompactionJob
  • EmbeddingJob
  • ReindexJob
  • StreamEnvelope

• Scalar Value Types

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upsquad/context/v1/context.proto

AssembleContextRequest

AssembleContextRequest is the input to the primary hot-path RPC. The engine assembles a cache-friendly prompt from immutable layers, pinned chunks, and retrieved semantic context within the token budget.

Field	Type	Label	Description
scope	ScopePath		scope is the caller's position in the tenant hierarchy (from JWT).
session_id	string		session_id identifies the active conversation session.
task_description	string		task_description is the current agent task used to drive semantic retrieval.
token_budget	int32		token_budget is the maximum number of tokens the assembled prompt may use.
model_id	string		model_id identifies the target LLM so token counting uses the correct tokenizer.
hints	AssembleContextRequest.HintsEntry	repeated	hints carry optional directives such as pinned_chunk_ids or must_include keys.

AssembleContextRequest.HintsEntry

Field	Type	Label	Description
key	string
value	string

AssembleContextResponse

AssembleContextResponse is the result of context assembly. It includes the assembled prompt, cache boundary metadata, quality attestation, and savings metrics.

Field	Type	Label	Description
prompt_id	string		prompt_id is the SHA-256 content hash of the assembled prompt, usable as a stable cache key for provider-side prompt caching.
assembled_prompt	string		assembled_prompt is the full prompt string ready for LLM dispatch. The stable prefix (layers L1–L4 + pinned chunks) is placed first to maximise provider cache hit rate.
cache_prefix_bytes	int32		cache_prefix_bytes is the byte offset marking the boundary between the stable prefix and the unstable tail. Callers should apply cache_control up to this boundary.
assembled_tokens	int32		assembled_tokens is the token count of the assembled prompt.
baseline_tokens	int32		baseline_tokens is the naive token count (no optimisation) sampled on a percentage of calls. Zero when not sampled this call.
savings_ratio	double		savings_ratio is (baseline_tokens - assembled_tokens) / baseline_tokens. Zero when not sampled.
version_hash	string		version_hash is the Merkle hash of all included chunks; used for delta reuse.
chunk_ids	string	repeated	chunk_ids lists the IDs of every chunk included in the assembled prompt.
quality	QualityAttestation		quality contains attestation data about retrieval confidence.

CompactRequest

CompactRequest triggers synchronous compaction for a session. Async compaction is triggered automatically via Redis Streams when session tokens exceed 80% of the token budget.

Field	Type	Label	Description
scope	ScopePath		scope is the caller's position in the tenant hierarchy.
session_id	string		session_id identifies the session to compact.
strategy	string		strategy selects the compaction algorithm. Only 'sliding_window' is supported in MVP.

CompactResponse

CompactResponse reports compaction results including quality metrics.

Field	Type	Label	Description
version_hash	string		version_hash is the content hash of the post-compaction session state.
original_tokens	int32		original_tokens is the token count before compaction.
compacted_tokens	int32		compacted_tokens is the token count after compaction.
fact_retention_score	double		fact_retention_score is the self-evaluated quality score in [0, 1]. Compaction is rejected (QUALITY_GUARDRAIL_TRIGGERED) if this falls below 0.98.

CreateShareRequest

CreateShareRequest grants a grantee scope access to a specific resource. The grantor scope is inferred from the caller's JWT claims. Requires clearance L3+; cross-pillar shares require L4+.

Field	Type	Label	Description
scope	ScopePath		scope is the grantor's position in the tenant hierarchy.
resource_id	string		resource_id is the UUID of the resource (chunk, snapshot, layer) to share.
resource_type	string		resource_type identifies the kind of resource: 'chunk', 'snapshot', 'layer'.
grantee_scope	string		grantee_scope is the hierarchical scope type of the grantee: 'org', 'pillar', 'team', or 'agent'.
grantee_scope_id	string		grantee_scope_id is the UUID of the grantee entity within grantee_scope.
permissions	string	repeated	permissions is the list of allowed operations: 'read', 'use_in_assembly'.
reason	string		reason is an optional audit-trail annotation for the share grant.

CreateShareResponse

CreateShareResponse confirms the share grant creation.

Field	Type	Label	Description
share_id	string		share_id is the UUID of the created share grant record.
created_at	google.protobuf.Timestamp		created_at is the server-side timestamp of the grant.

CreateSnapshotRequest

CreateSnapshotRequest creates a named, immutable snapshot of the current session state. Requires clearance L2 or above.

Field	Type	Label	Description
scope	ScopePath		scope is the caller's position in the tenant hierarchy.
session_id	string		session_id identifies the session to snapshot.
snapshot_name	string		snapshot_name is the human-readable label for this snapshot.

CreateSnapshotResponse

CreateSnapshotResponse confirms snapshot creation.

Field	Type	Label	Description
snapshot_id	string		snapshot_id is the UUID of the created snapshot record.
version_hash	string		version_hash is the content hash of the snapshotted state.
created_at	google.protobuf.Timestamp		created_at is the server-side timestamp of the snapshot.

EmbedRequest

EmbedRequest generates embeddings for one or more text inputs. Results are cached by content hash (30-day TTL).

Field	Type	Label	Description
scope	ScopePath		scope is the caller's position in the tenant hierarchy.
texts	string	repeated	texts is the list of strings to embed. Batches up to 100 items.
model_version	string		model_version selects the embedding model revision. An empty string uses the configured default (text-embedding-3-small).

EmbedResponse

EmbedResponse returns one embedding vector per input text.

Field	Type	Label	Description
embeddings	EmbeddingVector	repeated	embeddings is the list of float32 vectors, in the same order as the request texts.
model_version	string		model_version records which model revision produced these embeddings.

EmbeddingVector

EmbeddingVector holds a single dense embedding vector.

Field	Type	Label	Description
values	float	repeated	values is the float32 representation. Dimension is model-dependent (default 1536).
cached	bool		cached is true when this embedding was served from the Redis embedding cache.

GuardrailLayer

GuardrailLayer describes one immutable guardrail layer (L1-L4) as it stands right now in the guardrail store. The version is the freshness oracle the orchestrator uses to decide whether to re-pin at a turn boundary.

Field	Type	Label	Description
layer_level	int32		layer_level is the chain-of-trust level, 1..4 (L1 platform, L2 tenant, L3 team, L4 agent).
content_hash	string		content_hash is the current SHA-256 of the active layer content.
version	int64		version is monotonic per (scope, layer_level): a higher version is always a strictly later revision. Re-pin only auto-adopts forward versions.
effective_at	int64		effective_at is the unix-milliseconds timestamp at which this version became active (derived from the layer's signed_at).

IngestEventRequest

IngestEventRequest persists a single conversation event.

Field	Type	Label	Description
scope	ScopePath		scope is the caller's position in the tenant hierarchy.
session_id	string		session_id identifies the active conversation session.
event_type	string		event_type categorises the event: 'message', 'tool_output', 'workflow_event'.
content	bytes		content is the raw event payload; encoding is caller-defined (typically UTF-8 JSON).
metadata	IngestEventRequest.MetadataEntry	repeated	metadata carries optional key-value annotations (e.g. role, tool_name, latency_ms).

IngestEventRequest.MetadataEntry

Field	Type	Label	Description
key	string
value	string

IngestEventResponse

IngestEventResponse confirms ingestion and returns the content hash for deduplication and delta tracking.

Field	Type	Label	Description
event_id	string		event_id is the UUID of the persisted event record.
version_hash	string		version_hash is the SHA-256 of the event content; used for deduplication.
token_count	int32		token_count is the tiktoken-computed token count of the content.

ListSharesRequest

ListSharesRequest retrieves all share grants visible to the caller.

Field	Type	Label	Description
scope	ScopePath		scope is the caller's position in the tenant hierarchy.
page	int32		page is the 1-based page number for pagination.
page_size	int32		page_size is the maximum number of results per page. Max 100.

ListSharesResponse

ListSharesResponse returns a paginated list of share grants.

Field	Type	Label	Description
shares	ShareGrant	repeated	shares is the list of share grant records visible to the caller.
total_count	int32		total_count is the total number of matching grants (for pagination).

PullContextRequest

PullContextRequest retrieves a memory snapshot from the version store. Always reads from primary DB — never from cache.

Field	Type	Label	Description
scope	ScopePath		scope is the caller's position in the tenant hierarchy.
agent_id	string		agent_id identifies the agent whose memory is being retrieved.
session_id	string		session_id optionally scopes the pull to a specific session.
snapshot_name	string		snapshot_name optionally targets a named snapshot instead of the latest version.

PullContextResponse

PullContextResponse returns the memory snapshot payload.

Field	Type	Label	Description
version_hash	string		version_hash identifies the version of the returned snapshot.
memory_type	string		memory_type categorises the returned content.
content	bytes		content is the serialised memory payload.
created_at	google.protobuf.Timestamp		created_at is the timestamp of the snapshot.
metadata	PullContextResponse.MetadataEntry	repeated	metadata carries annotations stored with the snapshot.

PullContextResponse.MetadataEntry

Field	Type	Label	Description
key	string
value	string

PushContextRequest

PushContextRequest persists a memory snapshot to the version store.

Field	Type	Label	Description
scope	ScopePath		scope is the caller's position in the tenant hierarchy.
session_id	string		session_id identifies the session whose memory is being pushed.
memory_type	string		memory_type categorises the content: 'episodic', 'semantic', 'working'.
content	bytes		content is the serialised memory payload.
metadata	PushContextRequest.MetadataEntry	repeated	metadata carries optional annotations.

PushContextRequest.MetadataEntry

Field	Type	Label	Description
key	string
value	string

PushContextResponse

PushContextResponse confirms the push and returns the new version hash.

Field	Type	Label	Description
version_hash	string		version_hash is the SHA-256 of the pushed content; acts as a version tag.
created_at	google.protobuf.Timestamp		created_at is the server-side timestamp of the push.

QualityAttestation

QualityAttestation captures retrieval quality signals attached to every AssembleContextResponse. Used by the guardrail engine to decide whether to expand retrieval or fall back to recency-only.

Field	Type	Label	Description
confidence_score	double		confidence_score is the mean retrieval similarity score in [0, 1].
expansion_applied	bool		expansion_applied is true when the engine broadened the retrieval pool due to a low initial confidence score.
fallback_used	bool		fallback_used is true when the engine fell back to recency-only retrieval because semantic retrieval failed or returned no results.
fallback_reason	string		fallback_reason describes why the fallback was triggered.

ResolveGuardrailLayersRequest

ResolveGuardrailLayersRequest asks the engine for the current guardrail layer set for the caller's scope. It carries only the scope; the engine resolves the active L1-L4 layers under the same RLS GUC as ValidatePrompt.

Field	Type	Label	Description
scope	ScopePath		scope is the caller's position in the tenant hierarchy (from JWT).

ResolveGuardrailLayersResponse

ResolveGuardrailLayersResponse returns the current L1-L4 guardrail layers, each labelled with its monotonic store version. Layers are returned in ascending layer_level order (L1..L4). A layer that has no active row for the scope is simply absent from the list.

Field	Type	Label	Description
layers	GuardrailLayer	repeated	layers is the current guardrail set, L1-L4, ascending by layer_level.

RevokeShareRequest

RevokeShareRequest removes an existing share grant. Requires clearance L3+ or being the original grant creator.

Field	Type	Label	Description
scope	ScopePath		scope is the caller's position in the tenant hierarchy.
share_id	string		share_id is the UUID of the share grant to revoke.
reason	string		reason is an optional audit-trail annotation for the revocation.

RevokeShareResponse

RevokeShareResponse confirms share grant revocation.

Field	Type	Label	Description
revoked_at	google.protobuf.Timestamp		revoked_at is the server-side timestamp of the revocation.

RollbackContextRequest

RollbackContextRequest reverts a session to a previous version. Requires clearance L3 or above (team lead).

Field	Type	Label	Description
scope	ScopePath		scope is the caller's position in the tenant hierarchy.
session_id	string		session_id identifies the session to roll back.
target_version_hash	string		target_version_hash is the content hash of the version to restore.

RollbackContextResponse

RollbackContextResponse confirms the rollback and reports the restored state.

Field	Type	Label	Description
restored_version_hash	string		restored_version_hash is the hash of the now-active version after rollback.
rolled_back_at	google.protobuf.Timestamp		rolled_back_at is the server-side timestamp of the rollback operation.

ScopePath

ScopePath identifies the caller's position in the tenant hierarchy. Every RPC must carry a ScopePath extracted from the caller's JWT claims. The engine validates that the scope in the request matches the JWT scope and enforces hierarchical isolation: Org > Pillar > Team > Agent.

Field	Type	Label	Description
org_id	string		org_id is always required; identifies the tenant organisation.
pillar_id	string		pillar_id is empty when operating at org level.
team_id	string		team_id is empty when operating at pillar level or above.
agent_id	string		agent_id is empty when operating at team level or above.

SearchRequest

SearchRequest performs a hybrid (vector + BM25 + recency) search.

Field	Type	Label	Description
scope	ScopePath		scope is the caller's position in the tenant hierarchy.
query	string		query is the natural-language search string.
domain	string		domain optionally restricts the search to a specific knowledge domain.
top_k	int32		top_k is the maximum number of results to return. Default: 10.
min_score	double		min_score is the minimum similarity threshold for inclusion. Default: 0.7.

SearchResponse

SearchResponse wraps a ranked list of search results.

Field	Type	Label	Description
results	SearchResult	repeated	results is the ranked list of matching chunks.

SearchResult

SearchResult is a single retrieved chunk with its provenance and score.

Field	Type	Label	Description
chunk_id	string		chunk_id is the UUID of the stored chunk.
content	string		content is the decoded text content of the chunk.
score	double		score is the final hybrid relevance score in [0, 1].
source	string		source identifies the origin document or event that produced this chunk.
metadata	SearchResult.MetadataEntry	repeated	metadata carries additional key-value annotations on the chunk.

SearchResult.MetadataEntry

Field	Type	Label	Description
key	string
value	string

ShareGrant

ShareGrant is a single share grant record as returned by ListShares.

Field	Type	Label	Description
share_id	string		share_id is the UUID of this grant.
resource_id	string		resource_id is the UUID of the shared resource.
resource_type	string		resource_type identifies the kind of resource.
grantor_scope_id	string		grantor_scope_id is the UUID of the entity that created the grant.
grantee_scope	string		grantee_scope is the hierarchical scope type of the grantee.
grantee_scope_id	string		grantee_scope_id is the UUID of the grantee entity.
permissions	string	repeated	permissions is the list of allowed operations.
reason	string		reason is the audit annotation recorded at grant creation.
created_at	google.protobuf.Timestamp		created_at is when the grant was created.

ValidatePromptRequest

ValidatePromptRequest submits an assembled prompt for tampering and injection detection against the 4-layer hash chain.

Field	Type	Label	Description
scope	ScopePath		scope is the caller's position in the tenant hierarchy.
prompt	string		prompt is the assembled prompt string to validate.
layer_hashes	string	repeated	layer_hashes contains the expected SHA-256 hashes of layers L1–L4 in order. The engine verifies the prompt contains these layers verbatim.

ValidatePromptResponse

ValidatePromptResponse reports the validation result.

Field	Type	Label	Description
valid	bool		valid is true when the prompt passes all validation checks.
violation_code	string		violation_code is set when valid is false; maps to the error code taxonomy.
violation_detail	string		violation_detail provides a human-readable explanation of the violation.

ContextEngine

ContextEngine is the central gRPC service for all context, memory, and retrieval operations. It sits between the Agent Runtime and the data layer.

--- Hot path (called before every LLM call) ---

Method Name	Request Type	Response Type	Description
AssembleContext	AssembleContextRequest	AssembleContextResponse	AssembleContext assembles an optimised prompt from the 4-layer immutable chain of trust plus retrieved semantic chunks. Target latency: p95 < 500ms.
IngestEvent	IngestEventRequest	IngestEventResponse	IngestEvent persists a conversation event, computes its content hash, counts tokens, and enqueues async embedding.
Compact	CompactRequest	CompactResponse	Compact summarises older session history via the compaction LLM (Gemini 2.5 Flash-Lite) when session tokens exceed 80% of the token budget. Only the sliding_window strategy is supported in MVP.
PushContext	PushContextRequest	PushContextResponse	PushContext persists a memory snapshot to the version-controlled store.
PullContext	PullContextRequest	PullContextResponse	PullContext retrieves a memory snapshot. Reads from primary DB (never cache).
RollbackContext	RollbackContextRequest	RollbackContextResponse	RollbackContext reverts a session to a previous version hash. Requires clearance L3 or above.
CreateSnapshot	CreateSnapshotRequest	CreateSnapshotResponse	CreateSnapshot creates a named, immutable snapshot of the current session state. Requires clearance L2 or above.
ValidatePrompt	ValidatePromptRequest	ValidatePromptResponse	ValidatePrompt checks an assembled prompt against the 4-layer hash chain to detect tampering and prompt-injection patterns.
Search	SearchRequest	SearchResponse	Search performs a hybrid (vector + BM25 + recency) search across the caller's accessible context corpus.
Embed	EmbedRequest	EmbedResponse	Embed generates embeddings for the provided texts using the configured embedding model (default: text-embedding-3-small). Results are cached by content hash with a 30-day TTL.
CreateShare	CreateShareRequest	CreateShareResponse	CreateShare grants a named grantee scope access to a specific resource. Requires clearance L3+; cross-pillar shares require L4+.
RevokeShare	RevokeShareRequest	RevokeShareResponse	RevokeShare removes an existing share grant. Requires clearance L3+ or being the original grant creator.
ListShares	ListSharesRequest	ListSharesResponse	ListShares returns share grants where the caller is owner or grantee.
ResolveGuardrailLayers	ResolveGuardrailLayersRequest	ResolveGuardrailLayersResponse	ResolveGuardrailLayers returns the current 4-layer guardrail set (L1-L4) for the caller's scope, each labelled with its monotonic store version. This is the same layer set ValidatePrompt compares against, but exposes the version that already exists in the guardrail store so the orchestrator can distinguish a forward (tightening) update from a backward/sideways mutation at a turn boundary. Additive; ValidatePrompt is unchanged. Resolves under the same RLS GUC (app.org_id) as every other RPC.

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upsquad/context/v1/stream.proto

AuditAccessEvent

AuditAccessEvent is the payload carried in audit:access stream messages. Published by any service that performs a cross-scope access operation. Consumed by the Audit Writer for async persistence to the audit log.

Field	Type	Label	Description
actor_scope	ScopePath		actor_scope is the scope of the entity performing the access.
target_resource_id	string		target_resource_id is the UUID of the accessed resource.
target_resource_type	string		target_resource_type identifies the kind of accessed resource.
operation	string		operation describes the action performed (e.g. 'read', 'create_share').
share_id	string		share_id is set when the access was via a share grant.
outcome	string		outcome is 'allowed' or 'denied'.
denial_reason	string		denial_reason is set when outcome is 'denied'.
occurred_at	google.protobuf.Timestamp		occurred_at is the timestamp of the access attempt.

BaselineMetricEvent

BaselineMetricEvent is the payload carried in metrics:baseline stream messages. Published by the Assembly Pipeline on sampled calls to measure naive token usage. Consumed by the Baseline Calculator for savings ratio computation.

Field	Type	Label	Description
prompt_id	string		prompt_id is the content hash of the assembled prompt being measured.
scope	ScopePath		scope is the caller's position in the tenant hierarchy.
session_id	string		session_id identifies the session.
assembled_tokens	int32		assembled_tokens is the optimised token count.
naive_tokens	int32		naive_tokens is the unoptimised (baseline) token count.
model_id	string		model_id is the target LLM that will consume this prompt.
sampled_at	google.protobuf.Timestamp		sampled_at is when this sample was taken.

CompactionJob

CompactionJob is the payload carried in compaction:{org_id} stream messages. Published by the Assembly Pipeline when session tokens exceed 80% of budget. Consumed by the Compaction Worker Pool.

Field	Type	Label	Description
session_id	string		session_id identifies the session that requires compaction.
scope	ScopePath		scope is the session owner's position in the tenant hierarchy.
current_token_count	int32		current_token_count is the token count that triggered the compaction.
token_budget	int32		token_budget is the configured budget that was exceeded.
strategy	string		strategy is the requested compaction strategy (currently 'sliding_window').
triggered_at	google.protobuf.Timestamp		triggered_at is the timestamp when the threshold was crossed.

EmbeddingJob

EmbeddingJob is the payload carried in embedding:{org_id} stream messages. Published by the Ingestion Service for async chunk embedding. Consumed by the Embedding Pipeline.

Field	Type	Label	Description
event_id	string		event_id is the UUID of the ingested event whose content needs embedding.
chunk_ids	string	repeated	chunk_ids are the UUIDs of the text chunks to embed.
scope	ScopePath		scope is the caller's position in the tenant hierarchy.
model_version	string		model_version selects the embedding model revision. Empty = default.
queued_at	google.protobuf.Timestamp		queued_at is the timestamp when this job was enqueued.

ReindexJob

ReindexJob is the payload carried in reindex:{org_id} stream messages. Published by the Admin API when the embedding model version changes or when corruption is detected. Consumed by the Reindex Worker.

Field	Type	Label	Description
scope	ScopePath		scope identifies which org/pillar/team scope needs re-embedding.
old_model_version	string		old_model_version is the model revision being replaced.
new_model_version	string		new_model_version is the target model revision.
initiated_by	string		initiated_by is the user/agent ID that triggered the reindex.
initiated_at	google.protobuf.Timestamp		initiated_at is the timestamp of the reindex request.

StreamEnvelope

StreamEnvelope is the common wrapper for every message published to a Redis Stream. It carries routing metadata (message_id, stream name, ScopePath) alongside the opaque serialised payload.

Stream → Payload type mapping: compaction:{org_id} → CompactionJob embedding:{org_id} → EmbeddingJob reindex:{org_id} → ReindexJob metrics:baseline → BaselineMetricEvent audit:access → AuditAccessEvent

Field	Type	Label	Description
message_id	string		message_id is the unique identifier for this stream message (UUID). Consumers use this for idempotency and ACK tracking.
stream	string		stream is the full Redis Stream key this message was published to (e.g. "compaction:org-123").
scope	ScopePath		scope is the ScopePath of the originating caller; used by consumers to re-establish tenant context without decoding the payload.
created_at	google.protobuf.Timestamp		created_at is the server-side timestamp of publication.
payload	bytes		payload is the stream-specific Protobuf message serialised to bytes. Consumers must decode it based on the stream field.

Scalar Value Types

.proto Type	Notes	C++	Java	Python	Go	C#	PHP	Ruby
double		double	double	float	float64	double	float	Float
float		float	float	float	float32	float	float	Float
int32	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead.	int32	int	int	int32	int	integer	Bignum or Fixnum (as required)
int64	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead.	int64	long	int/long	int64	long	integer/string	Bignum
uint32	Uses variable-length encoding.	uint32	int	int/long	uint32	uint	integer	Bignum or Fixnum (as required)
uint64	Uses variable-length encoding.	uint64	long	int/long	uint64	ulong	integer/string	Bignum or Fixnum (as required)
sint32	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s.	int32	int	int	int32	int	integer	Bignum or Fixnum (as required)
sint64	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s.	int64	long	int/long	int64	long	integer/string	Bignum
fixed32	Always four bytes. More efficient than uint32 if values are often greater than 2^28.	uint32	int	int	uint32	uint	integer	Bignum or Fixnum (as required)
fixed64	Always eight bytes. More efficient than uint64 if values are often greater than 2^56.	uint64	long	int/long	uint64	ulong	integer/string	Bignum
sfixed32	Always four bytes.	int32	int	int	int32	int	integer	Bignum or Fixnum (as required)
sfixed64	Always eight bytes.	int64	long	int/long	int64	long	integer/string	Bignum
bool		bool	boolean	boolean	bool	bool	boolean	TrueClass/FalseClass
string	A string must always contain UTF-8 encoded or 7-bit ASCII text.	string	String	str/unicode	string	string	string	String (UTF-8)
bytes	May contain any arbitrary sequence of bytes.	string	ByteString	str	[]byte	ByteString	string	String (ASCII-8BIT)