diff --git a/docs/cli.md b/docs/cli.md
index f29277b..21d7fc7 100644
--- a/docs/cli.md
+++ b/docs/cli.md
@@ -40,7 +40,7 @@ pipeline ID and **--input** are required.
 | **--debug-dir path** | Override the debug-bundle root. Requires **--debug**. |
 | **--only lane-a,lane-b** | Run only the selected comma-separated artifact lanes when that selection is valid for the configured pipeline. |
 | **--llm-profile id** | Highest-precedence configured profile for selected LLM-backed bindings and validators; it replaces binding and [pipeline](config.md#pipelines) defaults. |
-| **--session-id id** | Supply a non-empty prompt session identifier to LLM-backed module calls. |
+| **--session-id id** | Override the generated prompt session identifier with a non-empty value for LLM-backed module calls. |
 | **--reasoning-effort value** | Replace the selected PromptKit profile's reasoning effort for every LLM-backed call in this run. The value must be non-empty and the flag may be specified only once. |
 | **--clear-reasoning-effort** | Clear reasoning effort inherited from the selected PromptKit profile for every LLM-backed call in this run. |
 | **--reference selector=path** | Add or replace a file reference binding. Repeatable. |
@@ -57,6 +57,16 @@ Persistent reasoning settings remain a PromptKit profile concern.
 **--recompute-step** requires **--resume**; checkpoint requirements and reuse
 behavior are documented in [Operations](operations.md).
 
+Every run uses one effective prompt session. Without **--session-id**, Notarius
+generates a stable `notarius:v1:` identifier from the trimmed resolved input
+module key and the input file's exact raw bytes. The same module and bytes
+therefore produce the same identifier, regardless of pipeline, references,
+profile, retries, or run settings. An explicit non-empty value replaces that
+default. Session identifiers are visible to providers; they are non-secret
+correlation identifiers, not credential storage. See
+[Operations](operations.md#operational-limits) for privacy and workflow
+guidance.
+
 ### Reference selectors
 
 Use **--reference** only for a reference slot declared by the selected
diff --git a/docs/config.md b/docs/config.md
index 2aeb274..f1ead4f 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -58,7 +58,7 @@ Built-in defaults are:
 
 | Field | Default |
 | --- | --- |
-| **concurrency.total_llm** | 1 |
+| **concurrency.total_llm** | 16 |
 | **concurrency.stage_workers.extract** | Effective **total_llm** |
 | **output.directory** | **./notarius-output** |
 | **cache.chunk_plans.mode** | **auto** |
diff --git a/docs/consumers/subprocess.md b/docs/consumers/subprocess.md
index a828639..fe67c5a 100644
--- a/docs/consumers/subprocess.md
+++ b/docs/consumers/subprocess.md
@@ -27,10 +27,13 @@ notarius run pipeline-id \
 ```
 
 Use absolute paths for supplied input, configuration, output-root, and
-reference files. When a stable prompt session identifier or references are
-needed, pass the supported CLI flags. Supply credentials through Notarius's
-documented configuration and environment mechanisms, never as command-line
-arguments or generated secret-bearing configuration.
+reference files. Notarius generates a stable prompt session for the resolved
+input module and exact input bytes. Pass **--session-id** only when intentionally
+grouping different invocations under a different session. Supply credentials
+through Notarius's documented configuration and environment mechanisms, never
+as command-line arguments or generated secret-bearing configuration. In
+particular, a session identifier is provider-visible and is not a credential
+mechanism.
 
 Wait for the process before interpreting standard output. Only an exit status
 of 0 permits decoding the receipt. On a nonzero exit, retain standard error for
diff --git a/docs/integrations/json-output.md b/docs/integrations/json-output.md
index 1885f34..70ddd48 100644
--- a/docs/integrations/json-output.md
+++ b/docs/integrations/json-output.md
@@ -98,6 +98,11 @@ summarize results without embedding lane payload bytes. A chunk-plan summary is
 provenance for the plan used by this run; cache records, debug artifacts, and
 other operational state are not published as bundle files.
 
+When present, `metadata.session_id` is the effective non-secret routing
+correlation identifier used for the run. It can be visible to providers and is
+not a substitute for a cache or checkpoint identity. Its generation and
+override behavior are defined by the [CLI reference](../cli.md#run).
+
 Each `llm_profiles` entry identifies effective, non-secret LLM execution
 provenance:
 
diff --git a/docs/integrations/pkg-promptkit.md b/docs/integrations/pkg-promptkit.md
index 00b022a..baa7811 100644
--- a/docs/integrations/pkg-promptkit.md
+++ b/docs/integrations/pkg-promptkit.md
@@ -48,11 +48,13 @@ adapter boundary. It also retains responsibility for pipeline retries,
 scheduling, debug persistence, redaction, profile provenance, and conversion
 from private model responses into durable domain artifacts.
 
-Notarius sends its trimmed run session through PromptKit's direct session
+Notarius sends one stable effective session through PromptKit's direct session
 field, which is authoritative for provider session behavior. It also retains
 the same value as the `session_id` prompt variable for maintained prompt
-compatibility. Session IDs are stable, non-secret correlation identifiers and
-may be exposed to providers and provider observability.
+compatibility. The generated identifier is 76 ASCII characters, within
+PromptKit v0.5.0's 256-code-point session limit. Session IDs are non-secret
+correlation identifiers and may be exposed to providers and provider
+observability. The CLI contract owns generation and override behavior.
 
 Notarius records PromptKit's selected backend ID and effective reasoning
 setting as optional run-manifest provenance. Endpoint-only profiles have no
diff --git a/docs/internal/cli.md b/docs/internal/cli.md
index 566a704..b470e15 100644
--- a/docs/internal/cli.md
+++ b/docs/internal/cli.md
@@ -89,9 +89,11 @@ handoff:
    profiles;
 4. materialize external or generated references and record redacted invocation
    and resolution provenance when debug capture is enabled;
-5. construct registries, the scheduled LLM client, prepared modules, and the
-   requested cache/checkpoint collaborators;
-6. read the source input and invoke the framework runner; and
+5. construct registries, the scheduled LLM client, and prepared modules;
+6. read the source input once, resolve its effective session from the explicit
+   override or resolved input module and raw bytes, then construct requested
+   checkpoint collaborators and invoke the framework runner with that same
+   value; and
 7. write the runner's logical output files only after a successful run, then
    complete the command report and user-facing result.
 
@@ -102,6 +104,13 @@ final command result. Detailed state lifecycle, resume handling, and physical
 path confinement are maintained in [Run State Internals](state.md) and
 [Operations](../operations.md).
 
+The CLI owns the versioned generated-session policy and resolves the sole
+effective value before checkpoint construction. It records that value in the
+final debug invocation summary when capture is enabled and passes it unchanged
+to checkpoint identity and `pipeline.RunInput`. The public flag and stability
+contract are defined by the [CLI reference](../cli.md#run); framework and LLM
+packages only transport the supplied value.
+
 For `run --json`, the CLI constructs and encodes its private run-result receipt
 after a successful runner result is available, before it publishes logical
 output files. It writes the prepared receipt to standard output only after
diff --git a/docs/internal/llm.md b/docs/internal/llm.md
index a82e656..a3fe5f3 100644
--- a/docs/internal/llm.md
+++ b/docs/internal/llm.md
@@ -26,9 +26,10 @@ durable schemas. Those responsibilities remain with the module and its
 
 `PromptKitClient` validates the request target and prompt identity, maps each
 named material to a PromptKit inline artifact while preserving its origin URI,
-maps the trimmed request session to PromptKit's direct per-run session field,
-retains the same value as the `session_id` prompt variable for maintained
-prompt compatibility, and forwards profile selection. It then creates one
+passes the supplied request session through to PromptKit's direct per-run
+session field, retains the same value as the `session_id` prompt variable for
+maintained prompt compatibility, and forwards profile selection. It does not
+derive or replace session values; the CLI owns that policy. It then creates one
 frozen prepared execution, captures its caller-owned credential-redacted
 details for debug material, and executes that exact snapshot through
 PromptKit's prepared-execution boundary. The direct field
diff --git a/docs/internal/pipeline.md b/docs/internal/pipeline.md
index cf152eb..0589337 100644
--- a/docs/internal/pipeline.md
+++ b/docs/internal/pipeline.md
@@ -10,11 +10,11 @@ own durable output shapes. Concrete production extensions are covered by
 ## Boundary
 
 The pipeline framework accepts a resolved composition, registries, shared
-dependencies, input bytes, and state/debug collaborators. It returns logical
-output files, normalized artifacts, recorded rejections and warnings, manifest
-provenance, and checkpoint decisions. The CLI owns process arguments,
-configuration discovery, physical roots, and placement of returned output
-files.
+dependencies, input bytes, a supplied prompt session, and state/debug
+collaborators. It returns logical output files, normalized artifacts, recorded
+rejections and warnings, manifest provenance, and checkpoint decisions. The
+CLI owns process arguments, configuration discovery, session resolution,
+physical roots, and placement of returned output files.
 
 The framework has one fixed shape:
 
@@ -84,6 +84,10 @@ incompatible producer prevents the consumer step from starting.
 
 The runner validates its input, installs no-op state collaborators when none
 were supplied, and serially performs source parsing and chunk-plan selection.
+It transports the supplied session unchanged to prompt-facing operations and
+run-manifest metadata; it neither derives a session nor substitutes a parsed
+source document identifier. The public session contract is owned by the
+[CLI reference](../cli.md#run).
 An accepted plan is materialized into source-addressed chunks and passes the
 configured chunk validators before any lane runs. A chunk rejection is a
 recorded pipeline outcome: lanes do not start, but the output stage can encode
diff --git a/docs/operations.md b/docs/operations.md
index a25d94a..2f21777 100644
--- a/docs/operations.md
+++ b/docs/operations.md
@@ -266,16 +266,18 @@ transport-wide cap. Notarius does not add another timeout around PromptKit.
 The pinned upstream boundary and profile-format links are in
 [PromptKit Integration](integrations/pkg-promptkit.md).
 
-Concurrency has two independent layers. Notarius **total_llm** is the
-application-wide provider-call limit shared by all backends, modules, retries,
-and validators. PromptKit may impose a narrower admission limit for the
-selected backend. The effective active-generation bound is the intersection of
-both limits and can therefore be lower than **total_llm**. Built-in OpenRouter
-profiles use PromptKit's upstream backend limit; endpoint-only profiles have no
-PromptKit backend limit and remain bounded by Notarius. For the configured
-local backend, a zero **concurrency_limit** leaves only the Notarius scheduler
-as a call limit. A positive value makes the effective active local-generation
-bound the smaller of **total_llm** and that local limit.
+Concurrency has two independent layers. Notarius **total_llm** defaults to 16
+and is the application-wide provider-call limit shared by all backends,
+modules, retries, and validators. PromptKit may impose a narrower admission
+limit for the selected backend. The effective active-generation bound is the
+intersection of the Notarius limit, any PromptKit backend limit, and work made
+available by the pipeline. Built-in OpenRouter profiles use PromptKit's
+upstream backend limit; endpoint-only profiles have no PromptKit backend limit
+and remain bounded by Notarius. For the configured local backend, a zero
+**concurrency_limit** leaves only the Notarius scheduler as a call limit. A
+positive value makes the effective active local-generation bound the smaller
+of **total_llm** and that local limit, so a local limit of four permits no more
+than four active local generations.
 
 For a positive local limit, PromptKit owns its default waiting capacity and
 admission behavior. When a PromptKit backend has admitted all active and queued
@@ -289,3 +291,11 @@ under [PromptKit profiles](config.md#promptkit-profiles) and
 limits and actual provider-call limits are independent. Notarius writes local
 filesystem state only; remote storage, archival, and retention automation are
 outside the implemented CLI.
+
+Every run has an effective prompt session used for provider routing and run
+provenance. The generated default is stable for the same input module and raw
+input bytes; use [**--session-id**](cli.md#run) only when intentionally grouping
+different invocations. Both generated and explicit values can be visible to
+providers, manifests, checkpoints, and requested debug bundles. Do not put
+credentials or other secrets in an explicit session identifier; command-line
+values are not a credential mechanism.
diff --git a/docs/roadmap/future.md b/docs/roadmap/future.md
index df750cc..fd1c7a2 100644
--- a/docs/roadmap/future.md
+++ b/docs/roadmap/future.md
@@ -53,71 +53,6 @@ not as committed release dates.
   spell, combat, interaction, and scene-description lanes after real-world use.
   Add more complex chunking only in response to demonstrated failures.
 
-## Cross-Cutting LLM Runtime
-
-### Deterministic Prompt Session Identity
-
-- Replace the source-document-ID default for prompt sessions with one
-  predictable, procedurally generated session ID for the complete
-  source-processing workload.
-- Preserve an explicit non-empty `--session-id` as the highest-precedence
-  override. Otherwise, derive the default only from the effective input module
-  identity and the exact raw input bytes.
-- Use a versioned, bounded representation such as
-  `notarius:v1:<sha256(input-module + NUL + raw-input)>`. The exact encoding
-  must fit PromptKit's session length contract and must not embed source
-  content.
-- Keep the derived session stable across runs, pipelines, selected lanes,
-  ordered steps, retries, resume, recomputation, LLM profiles, reasoning
-  overrides, and output, debug, or cache settings.
-- Do not include file-backed references, generated references, reference
-  contents, or the composition of a reference bundle in session derivation.
-  References may change between prompt calls within one pipeline without
-  changing routing affinity.
-- Resolve the authoritative session before checkpoint construction and use the
-  same value for checkpoint runtime identity, every prompt-facing module,
-  PromptKit's direct session field, the compatibility `session_id` prompt
-  variable, run-manifest metadata, and debug metadata.
-- Keep routing identity separate from cache and checkpoint content identity.
-  Exact prompt prefixes, reference contents, model settings, and other
-  generation-affecting inputs must continue to participate in their existing
-  hashes and checkpoint fingerprints even though they do not change the
-  session.
-- Treat the generated value as a provider-visible, stable pseudonymous
-  correlation identifier. Do not introduce an installation-specific HMAC or
-  secret unless a concrete multi-tenant or privacy requirement justifies
-  sacrificing deterministic identity across installations.
-
-### Raise The Default Application-Wide LLM Limit
-
-- Raise the default `concurrency.total_llm` value from 1 to 16 so ordinary
-  single-backend runs can use PromptKit's expected OpenRouter capacity and
-  lower-capacity local backends without an unnecessarily narrower Notarius
-  limit.
-- Keep the Notarius application-wide scheduler mandatory and require
-  `total_llm` to remain a positive integer. Do not make the default unlimited:
-  endpoint-only profiles, an unrestricted local backend, injected clients, and
-  aggregate work across several backends may have no narrower PromptKit limit.
-- Continue defaulting `concurrency.stage_workers.extract` to the effective
-  `total_llm`, making its default 16 as part of the same change. Preserve an
-  explicit lower extract-worker setting when an operator wants less queued or
-  concurrent extraction work.
-- Define effective provider concurrency as the intersection of the Notarius
-  application-wide limit, the selected PromptKit backend limit when present,
-  and the work made available by stage execution. A Notarius limit of 16 does
-  not narrow a backend already limited to 16, while a local backend limited to
-  4 remains bounded at 4.
-- Treat the default as an application-wide safety ceiling across profiles,
-  backends, modules, retries, and validators. A run that intentionally needs
-  the combined capacity of several backends may configure a higher
-  `total_llm` and an appropriate extract-worker count explicitly.
-- Retain the existing configuration and environment override surfaces. Update
-  canonical configuration, operations, and internal documentation together
-  when the default changes.
-- Reconsider decoupling the extract-worker default from `total_llm` only after
-  mixed-backend workloads demonstrate a need for a high global emergency
-  ceiling with a lower default work-production rate.
-
 ## Shared Normalization And Quality Work
 
 ### Generic LLM-Assisted Deduplication