Three Discovery Operating Modes: Human Search, Agent Reasoning, Answer Synthesis

Mechanism

The discovery substrate maintains a unified semantic index across which all modes traverse. A discovery object, instantiated in response to an inbound request, carries a mode tag, an authority token, and a parameter envelope that together determine the traversal behavior. The mode tag selects a parameterization profile; the authority token bounds which profiles are admissible; and the parameter envelope captures runtime values such as confidence thresholds, depth limits, breadth limits, accumulation strategies, and termination criteria. The traversal kernel itself is mode-agnostic. It walks the index according to the parameter envelope and emits candidate evidence as it proceeds. Mode-specific behavior emerges from how the discovery object filters, accumulates, and terminates over that candidate stream.

Focused mode constrains traversal to a narrow neighborhood around a seed concept and applies a high confidence threshold, such that only strongly corroborated evidence is admitted. Exploratory mode relaxes both the neighborhood constraint and the confidence threshold, permitting the traversal to surface weakly related material that may not converge into a single answer but exposes the structure of the surrounding semantic field. Corroborative mode maintains a moderate confidence threshold but requires that admitted evidence originate from a configurable minimum number of independent sources, with independence determined by lineage divergence in the index. Forensic mode disables aggressive pruning and instead emits the full traversal trace, including rejected candidates and the reasons for rejection, so that downstream auditors can reconstruct the discovery object's reasoning and verify that no relevant material was suppressed.

Mode transitions within a single discovery session are permitted only when the governance state allows them and only when the requesting authority can produce the credentials required by the destination mode. A transition from exploratory to forensic, for example, requires presentation of an audit credential, and the transition itself is recorded in the discovery object's lineage so that the mode at which any given piece of evidence was admitted is reconstructible after the fact.

Operating Parameters

Each mode is characterized by a parameter envelope whose values are bounded by the governance policy in force at the time of instantiation. The confidence threshold parameter ranges over a normalized scalar interval and gates whether a candidate is admitted into the result set. The traversal depth parameter is an integer bounding the number of edge hops the traversal kernel may take from any seed before pruning. The breadth parameter caps the number of sibling expansions considered at each node. The accumulation strategy parameter selects between rank-then-emit, emit-as-found, and converge-then-emit semantics. The termination parameter specifies whether the traversal halts on a fixed evidence count, on a confidence saturation condition, on a wall-clock budget, or on explicit caller cancellation.

Authority binding is enforced at parameter resolution. A request bearing only a baseline authority cannot raise the depth parameter beyond the baseline-permitted ceiling, cannot lower the confidence threshold below the baseline-permitted floor, and cannot select the forensic accumulation strategy at all. The governance layer rejects out-of-band parameter values at instantiation rather than at traversal time, so that a malformed or over-privileged request fails fast and produces no partial traversal artifacts that might leak privileged structure of the index.

The parameter envelope further admits a result-shaping parameter that controls the structural form of the emitted output. Output forms contemplated by the disclosure include ranked lists for human consumption, structured records with enumerated fields for machine consumption, evidence-citation pairs for synthesis consumption, and trace transcripts for audit consumption. The result-shaping parameter is independent of the mode tag; a focused-mode session may emit any admissible output form, subject to authority. Independence between mode and output form permits, for example, a focused-mode session that emits an evidence-citation pair list for downstream synthesis without re-running the traversal under a different mode profile.

Termination criteria interact with the accumulation strategy in well-defined ways. Under rank-then-emit accumulation, termination on evidence count yields the top-N ranked results; termination on confidence saturation yields all results above a dynamic threshold computed from the running rank distribution. Under emit-as-found accumulation, termination on evidence count yields the first N results in traversal order; termination on wall-clock budget yields whatever was emitted before the budget expired. Under converge-then-emit accumulation, termination is gated on the convergence condition itself, with wall-clock budget acting as a hard ceiling that, when reached, emits a partial result tagged as non-converged.

Alternative Embodiments

In one embodiment, the discovery substrate exposes the four modes as discrete endpoints, each backed by a distinct parameter profile compiled at deployment time. In an alternative embodiment, mode is a runtime parameter on a unified endpoint, and the parameter profile is resolved by lookup against a governance-signed mode registry. The runtime-parameter embodiment supports operator-defined modes beyond the four primaries, provided the operator's governance authority extends to mode definition.

A further embodiment supports compound modes in which two or more parameter profiles are merged according to a documented precedence rule, permitting, for example, a corroborative-forensic mode that requires multi-source convergence while also emitting full traversal lineage. A further embodiment permits mode escalation mid-traversal when the discovery object detects that the candidate stream has crossed a configured signal threshold, such as encountering evidence of provenance tampering, in which case the object may auto-escalate from exploratory to forensic upon presenting cached audit credentials previously bound to the request.

In yet another embodiment, the substrate operates over a federated index in which different shards are governed by different authorities. In this embodiment, mode selection is evaluated per shard, so that a single discovery session may operate in focused mode against one shard and in exploratory mode against another, depending on the shard-local governance state. Cross-shard result composition is mediated by a composition layer that reconciles per-shard modes into a unified output stream tagged with the per-evidence mode at admission.

Composition

The mode mechanism composes with the broader semantic discovery architecture along three axes. First, it composes with the governance state machine: every mode transition, every parameter resolution, and every authority check is a governance event that the state machine records. Second, it composes with the lineage substrate: the mode at which each piece of evidence was admitted is recorded alongside the evidence itself, so that downstream consumers can filter or weight evidence by admission mode. Third, it composes with the request authority layer: the authority token presented at request time bounds the mode space, and authority delegation rules determine whether a delegated request can re-enter the substrate at the same or a reduced mode space.

The composition is symmetric across consumer types. A human investigator using a focused-mode session and an autonomous agent using an exploratory-mode session present authority tokens drawn from the same authority namespace, parameter envelopes drawn from the same parameter schema, and traversal kernels drawn from the same kernel implementation. The differentiation between consumer types is fully captured in the parameter envelope and the authority token.

Cross-mode handoff within a single workflow is supported through discovery-object passing. A discovery object instantiated under one mode may be passed to a downstream consumer who, presenting an admissible authority, may continue traversal under the same or a different mode against the same index snapshot. The index snapshot is captured at instantiation and retained for the lifetime of the discovery object, so that a forensic-mode continuation observes exactly the index state observed by the original focused-mode pass, even if the live index has since advanced. This snapshot semantics is what permits credible audit and reproduction across mode transitions.

Prior-Art Distinction

Conventional search infrastructure serves a single mode: ranked retrieval for human consumption, with parameter knobs exposed only at the operator's discretion and without authority binding. Conventional retrieval-augmented generation pipelines layer a synthesis stage atop a single-mode retrieval backend, with no governance-bounded mode selection at the retrieval layer. Conventional audit and forensic tooling typically operates as a parallel subsystem rather than as a mode of the primary retrieval substrate, requiring evidence to be re-fetched and re-evaluated under audit conditions, with no guarantee that the audit traversal observes the same index state as the original retrieval.

The disclosed mechanism distinguishes over each of these by unifying retrieval, exploration, corroboration, and audit as parameterized modes of a single substrate, by binding mode selection to request authority through a governance state machine, and by recording per-evidence admission mode in lineage to support post-hoc reconstruction of mode-specific reasoning.

Implementation Considerations

Practical implementation of the mode mechanism benefits from a clean separation between the parameter resolution stage, the traversal kernel, and the result accumulation layer. Parameter resolution executes synchronously at instantiation and produces an immutable parameter record bound to the discovery object. The traversal kernel reads the parameter record and walks the index without further governance interaction, except at points where authority-bounded operations such as cross-shard escalation are encountered. The result accumulation layer consumes the candidate stream from the kernel, applies the mode-specific filtering and shaping rules, and emits to the consumer. This separation enables independent evolution of governance, kernel, and shaping logic without cross-cutting changes.

Caching strategies are mode-dependent. Focused-mode results may be cached at high specificity since the parameter envelope is narrow and cache hits are likely under repeated narrow queries. Exploratory-mode results are typically not cached at the result level because the parameter envelope is broad and cache locality is poor; instead, intermediate traversal frontiers may be cached at the kernel level. Forensic-mode results are not cached at all, since the audit guarantee requires that every forensic traversal observe the live index state at the moment of audit. The disclosure contemplates per-mode cache policy as a governance-bounded operator parameter.

Disclosure Scope

This disclosure encompasses any discovery substrate that supports a plurality of operating modes over a shared traversal index, in which mode selection is bounded by request authority and governance state, in which mode-specific behavior is captured in a parameter envelope resolved at instantiation, and in which the admission mode of each piece of evidence is recorded in a lineage substrate. The four enumerated modes are illustrative; substrates supporting additional or alternative modes fall within scope provided the authority binding and lineage recording mechanisms are present. The disclosure further encompasses mode escalation, compound modes, federated mode evaluation, and runtime mode registries as enumerated in the alternative embodiments.