RUNTIME FRAMEWORK · Profile revision 1
LangGraph
A stateful agent runtime whose checkpoint, thread, subgraph, replay, and interrupt semantics can preserve execution state independently of an observability backend.
Why it is in the map
LangGraph contributes durable runtime-state and human-intervention evidence that is materially different from ordinary telemetry spans.
Tracevity boundary
A documented field can support reconstruction, but its presence alone does not prove completeness, authenticity, authorization, or external settlement.
Profile findings
What the documentation can—and cannot—establish
Each row distinguishes source evidence from Tracevity's bounded interpretation. “Not documented” describes the reviewed sources; it does not prove an implementation cannot record the artifact.
System identity
Partially documentedThread, checkpoint, task, parent, and checkpoint-namespace data can correlate runtime and subgraph state.
Tracevity interpretation
The runtime preserves useful execution identity, but not a complete stable agent-instance and agent-definition version tuple.
Limit
Product/runtime version and canonical agent instance or definition version are not required checkpoint fields.
Primary evidence (1)
- LangChain: Persistence Threads, Checkpoints, and StateSnapshot
Principal and delegation
Not documentedCore persistence does not define initiating principal, authenticated identity, delegation, credential, scope, expiry, or elevation fields.
Tracevity interpretation
Thread identity and subgraph ancestry must not be treated as principal identity or delegated authority.
Limit
Applications can add identity data to state, but its schema, authentication, and completeness are unknown.
Primary evidence (1)
- LangChain: Persistence Checkpoint schema
Instruction and context
Partially documentedInstructions and contextual inputs can survive when the graph places them in checkpointed state.
Tracevity interpretation
Checkpoint presence does not establish that all context was captured or that its source and version are authentic.
Limit
No universal instruction fields, retrieval-source schema, context fingerprint, or missing-context representation is documented.
Primary evidence (1)
- LangChain: Persistence StateSnapshot values and tasks
Decision artifacts
Partially documentedPause/resume decisions are explicit, and application-emitted plan state can be preserved.
Tracevity interpretation
These are observable control artifacts, not hidden chain-of-thought or proof of true motive.
Limit
No universal decision-summary, selected-alternative, policy, evaluator, confidence, or refusal schema is defined.
Primary evidence (1)
- LangChain: Interrupts Pause using interrupt and resume using Command
Model activity
UnknownModel activity may appear in application state or integration traces rather than in one core checkpoint contract.
Tracevity interpretation
Model reconstruction depends on the graph state and selected instrumentation, not LangGraph persistence alone.
Limit
Provider, identifier, version, request/response, token, latency, error, and cache completeness are unknown.
Primary evidence (1)
- LangChain: Observability Trace LangGraph applications
Tool and MCP activity
Partially documentedProposed tool activity and selected control decisions can be correlated to runtime state.
Tracevity interpretation
This does not guarantee a universal MCP server, credential, retry, or downstream correlation record.
Limit
Tool-call ID, argument/result, latency, retry, server identity, and downstream fields remain application or integration dependent.
Primary evidence (1)
- LangChain: Human-in-the-loop Review tool calls with approve, edit, or reject decisions
Effects
Not documentedThe runtime recognizes that nodes may cause side effects but does not define a first-class effect-evidence model.
Tracevity interpretation
A task or tool result cannot establish provider acceptance, external settlement, or resulting state.
Limit
Read/write/transaction type, requested effect, acceptance, external state, and state delta are not standardized.
Primary evidence (1)
- LangChain: Persistence Replay and time travel
Human control
DocumentedApproval, rejection, edit, interruption, and resume are explicit runtime controls.
Tracevity interpretation
These controls are reconstructable when their state and decisions are retained by the configured checkpointer.
Limit
Takeover, rollback request, compensation, reviewer identity, and authority are not universal fields.
Primary evidence (1)
- LangChain: Human-in-the-loop Decision types
Outcome
Partially documentedRuntime progress, failures, and application-reported final state can be reconstructed from retained checkpoints.
Tracevity interpretation
Graph completion is not proof that a downstream system accepted or retained an external change.
Limit
Externally verified success, ambiguous/partial outcome, rollback, and compensation are not canonical outcomes.
Primary evidence (1)
- LangChain: Persistence StateSnapshot fields
Trace integrity
Partially documentedCheckpoint lineage and timestamps provide history, but integrity properties are backend dependent.
Tracevity interpretation
New-checkpoint update semantics do not make the stored record signed, tamper-evident, or independently verifiable.
Limit
Clock provenance, immutability, append-only enforcement, signatures, and independent verification are not guaranteed.
Primary evidence (1)
- LangChain: Persistence Get state history and update state
Portability
UnknownState can move through implementation-specific storage and serializers, but standard trace portability is not established.
Tracevity interpretation
LangSmith tracing must be assessed as a separate artifact rather than inferred from checkpoint portability.
Limit
Native export schema version, import destinations, documented conversion, and semantic loss are unknown.
Primary evidence (1)
- LangChain: Persistence Checkpointer libraries and serializer
Privacy
UnknownSensitive content may be retained whenever an application places it in persisted state.
Tracevity interpretation
Privacy behavior belongs to the application, serializer, and storage backend rather than one universal LangGraph policy.
Limit
Prompt/output/tool/code retention, redaction, filtering, hashing, duration, deletion, and capture control are not uniformly documented.
Primary evidence (1)
- LangChain: Persistence Checkpoint contents and storage
Reconstruction reading
Do not collapse these findings into one score.
This profile describes documented evidence surfaces. Whether they are sufficient depends on the reconstruction question and the other identity, authorization, tool, and destination records available.
Potentially useful evidence
- Identity: Thread, checkpoint, task, parent, and checkpoint-namespace data can correlate runtime and subgraph state.
- Context: Instructions and contextual inputs can survive when the graph places them in checkpointed state.
- Decisions: Pause/resume decisions are explicit, and application-emitted plan state can be preserved.
- Tools: Proposed tool activity and selected control decisions can be correlated to runtime state.
- Human control: Approval, rejection, edit, interruption, and resume are explicit runtime controls.
Explicit gaps or uncertainty
- Principal: Applications can add identity data to state, but its schema, authentication, and completeness are unknown.
- Models: Provider, identifier, version, request/response, token, latency, error, and cache completeness are unknown.
- Effects: Read/write/transaction type, requested effect, acceptance, external state, and state delta are not standardized.
- Portability: Native export schema version, import destinations, documented conversion, and semantic loss are unknown.
- Privacy: Prompt/output/tool/code retention, redaction, filtering, hashing, duration, deletion, and capture control are not uniformly documented.
Source register
5 reviewed primary sources
- PersistenceLangChain · OFFICIAL DOCUMENTATION · observed August 28, 2026 · currentOpen source ↗
- InterruptsLangChain · OFFICIAL DOCUMENTATION · observed August 28, 2026 · currentOpen source ↗
- Human-in-the-loopLangChain · OFFICIAL DOCUMENTATION · observed August 28, 2026 · currentOpen source ↗
- Use subgraphsLangChain · OFFICIAL DOCUMENTATION · observed August 28, 2026 · currentOpen source ↗
- ObservabilityLangChain · OFFICIAL DOCUMENTATION · observed August 28, 2026 · currentOpen source ↗
Next question
What evidence does your use case require?
Move from documented field presence to an explicit reconstruction target, or examine selected directional format mappings without changing this system's documentation posture.
Trace Reconstruction Requirements Explore compatibility evidence