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5. The Orchestrator Capability Manifest: Governing Tool Access, Prompt Integrity and Model Authorization in Multi-Agent AI Systems

Posted on 09.04.26

by Ian Meinert • Article 5 of 7

A DevSecOps Framework for Secure Agent Orchestration in Enterprise and Government-Adjacent Environments

Multi-agent AI architectures create an authorization problem that traditional IAM frameworks simply weren’t built for. When there’s no explicit policy governing agent behavior, trust becomes implicit by default: agents call whatever tools the orchestrator hands them, run whatever prompts are baked into their code, and produce outputs that downstream agents consume without any independent check.

This article introduces the Orchestrator Capability Manifest, the governance artifact that makes secure multi-agent AI deployments possible. In practice, it’s a versioned, runtime-enforced policy document that ties each agent role to its authorized tools, prompt version, model pin, trust classification, output schema, HITL conditions and explainability requirements.

This article covers the orchestration governance layer that ties both earlier papers together, including explicit treatment of explainability requirements per agent role and federal source code obligations under OMB M-16-21 for orchestrator and manifest code developed under federal contract.

ABOUT THE AUTHOR

Ian Meinert is a Subject Matter Expert at Aptive, specializing in enterprise AI strategy and federal health IT, supporting the Department of Veterans Affairs. With a career spanning VA systems modernization and healthcare data interoperability, he brings practitioner-level insight to agentic AI deployment in complex government environments. A retired Marine Corps Veteran and former VA federal employee, Ian combines operational discipline with deep institutional knowledge to help organizations navigate the transition from AI experimentation to mission-ready implementation.

The Authorization Gap in Multi-Agent AI

Property 1: Agents Are Composable

Composition creates transitive trust. Without explicit trust boundaries, Agent A is operating in an environment shaped by Agent B’s outputs, with no controls on what that environment contains.

Property 2: Prompts Are Behavioral Code

A system prompt is executable behavioral code. In most implementations, changing it bypasses code review, regression testing, and change advisory entirely.

Property 3: Tool Access Is Delegated, Not Assigned

In most orchestration frameworks, the orchestrator hands tools to agents at invocation time. There’s no persistent authoritative record of what an agent role is actually authorized to use.

Property 4: Explainability Is an Afterthought, Not a Design Requirement

Most multi-agent systems are designed for operators and reviewers who have full system access. End users who receive AI-generated outputs generally have no visibility into which model produced them, what data informed them, or how the output was derived. That’s not just a UX gap. It’s a governance and accountability gap. NIST AI RMF 1.0 identifies explainability and interpretability as a core trustworthy AI characteristic, and without a defined explainability requirement per agent role, satisfying that characteristic systematically isn’t really possible.

The Gap

Put these four gaps together and you get a system where security and accountability are determined by whatever happens at runtime, not by anything that was written down and approved.

The Capability Manifest: Structure and Fields

The Capability Manifest defines the full authorization and accountability profile for each agent role. This version adds explainability level as a required field. The reasoning: NIST AI RMF identifies explainability as a core trustworthy AI characteristic, and there’s no way to satisfy that systematically without specifying it per agent role at design time.

[{

“agent_role”: “domain-specialist-analyst”,

“allowed_tools”: [

“ticketing-system:read”,

“knowledge-base:search”,

“document-store:retrieve”

],

“prompt_ref”: “domain-specialist-analyst:v2.4.1”,

“model_id”: “provider/model-name:version-pin”,

“trust_level”: “specialist”,

“output_schema_ref”: “domain-analyst-output:v1.2.0”,

“hitl_required”: “confidence < 0.75 OR classification == ‘critical'”,

“data_classification”: “sensitive”,

“audit_log_level”: “verbose”,

“explainability_level”: “rationale-summary”

},

{

“agent_role”: “orchestrator”,

“supervises”: [“domain-specialist-analyst”, “retrieval-agent”, “synthesis-agent”],

“authority_scope”: [“halt”, “restart”, “reassign”, “override_output”],

“trust_level”: “orchestrator”,

“hitl_required”: “override_output AND frequency > deployment_threshold”,

“escalation_target”: “human_operator”,

“audit_log_level”: “full-payload”,

“explainability_level”: “full-chain”

}]

Manifest Field	Purpose	Security Function	Governance Requirement
agent_role	Unique identifier for the agent’s functional role within the workflow.	Provides the identity anchor for all authorization decisions. All audit log entries are attributed to a role.	Immutable once assigned. Role changes require a manifest update with full change advisory process.
allowed_tools[]	Exhaustive list of tool identifiers the agent is authorized to invoke.	Enforces least privilege at the tool invocation layer. The orchestrator will not pass a tool not in this list.	Reviewed at each deployment gate. Additions require justification and approver sign-off. Never use wildcards.
prompt_ref	Versioned reference to the agent’s system prompt in the prompt farm.	Decouples prompt content from agent code. Creates an immutable audit link between agent behavior and prompt version.	Prompt changes increment the version. Prior versions are retained for audit and rollback. Changes require peer review.
model_id	Specific model identifier and version pinned to this agent role.	Prevents silent behavioral drift from model updates.	Model upgrades require regression testing before promotion to production.
trust_level	Enumerated trust classification: orchestrator, specialist, retrieval, synthesis, human-gated.	Governs which agents can receive outputs from which other agents.	Trust levels are assigned at design time and reviewed at each ATO boundary review.
output_schema_ref	Versioned reference to the JSON schema defining valid output structure for this agent.	Enables schema validation at every inter-agent handoff.	Schema changes require downstream impact analysis. Consumer agents must be tested against the new schema.
hitl_required	Boolean or condition expression defining when this agent’s outputs require human approval.	Enforces Human-in-the-Loop as a first-class architectural constraint.	HITL conditions are documented in the System Security Plan. Changes require security officer review.
data_classification	Maximum data sensitivity level this agent is authorized to process.	Prevents an agent authorized only for public data from receiving context that includes sensitive records.	Must be consistent with the system’s ATO data classification.
audit_log_level	Verbosity level for this agent’s audit logging: minimal, standard, verbose, full-payload.	Allows high-risk agents to log at higher verbosity without storage overhead for low-risk retrieval agents.	PHI-authorized agents and agents with write tool access must log at verbose or full-payload level.
explainability_level	Enumerated explainability requirement: none, confidence-score, rationale-summary, full-chain.	Governs what explanation data the agent must generate alongside its output for the end-user-facing layer.	Set at design time based on user role and output consequence level. Changes require UX and security review.
supervises[]	List of agent_role values this orchestrator instance has authority over.	Scopes supervisory authority to a defined agent set rather than implicit system-wide reach.	Reviewed at each deployment gate alongside allowed_tools[].
authority_scope[]	Enumerated list of supervisory actions this orchestrator role may take: halt, restart, reassign, override_output.	Replaces implicit, unlimited orchestrator authority with an explicit, auditable grant. The orchestrator cannot exercise an action not listed here.	Full change advisory required to add an action. Removing one requires only standard review.
escalation_target	Defines where control passes when the orchestrator cannot resolve a conflict or failure on its own.	Prevents silent failure loops; guarantees a defined human or system-of-record fallback exists.	Must resolve to a human_operator role for any override_output action, per hitl_required conventions.

Level	Definition	What the Agent Must Generate	Appropriate For
none	No explainability output required.	Primary output only.	Internal pipeline agents whose outputs are never directly consumed by end users. Retrieval and routing agents where the output is data, not a decision.
confidence-score	Numeric confidence score accompanying the output.	Primary output plus a confidence score (0.0–1.0) indicating the agent’s certainty in its output.	Classification and routing agents. Any agent whose output feeds a HITL gate. Outputs where low confidence should trigger escalation.
rationale-summary	Plain-language summary of the reasoning basis for the output.	Primary output, confidence score, and a 1–3 sentence summary of why the agent produced the output, citing the source data or tools consulted.	Outputs consumed directly by analysts or decision-makers. Recommendation outputs. Any output where the consumer needs to understand the basis to evaluate it.
full-chain	Complete reasoning chain including all intermediate steps, tool calls made, data sources consulted, and model inferences drawn.	Primary output, confidence score, rationale summary, and a structured trace of every tool call, retrieved document, and intermediate inference that contributed to the output.	High-consequence outputs (clinical, legal, financial, compliance). Any output that may be contested or require audit reconstruction. Outputs where regulatory explainability obligations apply.

Implementation Requirements by Explainability Level

Confidence-score: The agent’s system prompt needs to instruct it to output a confidence score in a defined schema field. That field must be typed as numeric in the output_schema_ref, and any HITL gate conditions should reference it directly.
Rationale-summary: Rationale-summary requires more care. The system prompt needs to instruct the agent to generate a summary citing specific source data, and the output_schema_ref needs a rationale field to hold it. Critically, the no-confabulation block has to explicitly cover that field. Rationale that references sources the agent didn’t actually consult is still confabulation, even if the primary output is accurate.
Full-chain: Full-chain is where the implementation cost shows up. The orchestrator needs to enable distributed trace capture across the full invocation, not just the final output. Tool calls, retrieved document identifiers, and intermediate outputs all need to be captured and tied to the workflow correlation ID. That full trace gets stored alongside the primary output in the audit record and has to be retrievable by correlation ID when someone needs it.

End-User Explainability Interface

Explainability data only matters if it actually reaches the people making decisions. For any system with agents operating at rationale-summary or full-chain levels, there are a few things the user-facing layer needs to get right.

Display confidence scores alongside AI-generated outputs wherever those outputs inform a decision. Suppressing them for aesthetic reasons isn’t acceptable: they’re safety information, not clutter.
Rationale summaries need to be readable and accessible, not buried in logs that only engineers can reach. If someone is acting on an AI output, they should be able to see why it was produced without filing a help ticket.
Any AI-generated output that affects a user’s situation needs an appeal path. The mechanism has to be documented, actually accessible, and result in real human review. This satisfies NIST AI RMF GV-1.2 and is increasingly expected under federal AI accountability frameworks.
HITL reviewers who approve or reject outputs should have the full reasoning chain in front of them, not just the final recommendation. Linking full-chain explanations to HITL review records makes that possible.

Component	What It Holds	What it Does NOT Hold	Security Boundary
Prompt Farm	Versioned system prompts, agent role definitions, no-confabulation blocks, output format instructions.	Tool definitions, tool credentials, execution logic, user data, or any runtime context.	Prompts are read-only at runtime. Write access requires change advisory process.
Tool Registry	Tool identifiers, tool descriptions, MCP server endpoint references, schema definitions for tool inputs/outputs.	Tool credentials, tool execution logic, prompt content, or agent authorization rules.	Discovery only. The registry tells agents what tools exist and where. It does not authorize access.
MCP Server (Scoped)	Tool execution logic, credential references (via secrets vault), connection configuration for the target system.	Prompt content, agent role definitions, tool grants for other MCP servers, or cross-agent context.	Each MCP server is the authorization and execution boundary for its own tools only.
Capability Manifest	Agent role definitions, allowed_tools[], prompt_ref, model_id, trust_level, output_schema_ref, hitl_required, data_classification, explainability_level.	Prompt content, tool execution logic, credentials, or runtime state.	The manifest is the policy document. Immutable at runtime. Changes require orchestrator-level authorization.
Secrets Vault	Credentials, API keys, OAuth tokens, encryption keys: all encrypted at rest with customer-managed keys.	Prompt content, tool definitions, agent role definitions, or any data that should be in another component.	No agent accesses the secrets vault directly. Credentials injected into MCP server processes at runtime.
Orchestrator	Capability manifest (runtime copy), session state, workflow routing logic, HITL gate enforcement, correlation ID management.	Persistent data, credentials, or prompt content (resolved at runtime, not stored).	Highest-trust component and highest-value attack target. Must run with least-privilege system access.

Runtime Enforcement: How the Orchestrator Uses the Manifest

Step 1. Manifest resolution. Fresh read from the manifest store with hash verification at every agent invocation. Cached copies don’t count.
Step 2. Prompt resolution. The orchestrator pulls the current versioned prompt from the prompt farm. Agents don’t hold local copies.
Step 3. Tool grant scoping. The tool list is built by intersecting the agent’s allowed_tools[] with what’s currently available in the tool registry.
Step 4. Model routing. The invocation routes to the model endpoint pinned in model_id. No substitutions.
Step 5. Output validation. Before anything goes downstream, the output is validated against output_schema_ref. Schema failures don’t pass.
Step 6. HITL gate evaluation. The hitl_required condition is evaluated against the agent’s output. If it fires, the workflow pauses.
Step 7. Explainability capture. The orchestrator captures explanation data at whatever level explainability_level specifies and attaches it to the audit record under the correlation ID.
Step 8. Audit log. An immutable entry is emitted covering all steps, tied to the workflow correlation ID.

Threat	Attack Vector	How the Manifest Pattern Mitigates It
Manifest tampering	Attacker modifies an agent’s allowed_tools[] or swaps its prompt_ref.	Manifest is immutable at runtime. All writes are logged, require orchestrator-level authorization, and trigger a change advisory gate. Manifest hash is verified at session start.
Privilege escalation via orchestrator	A compromised orchestrator attempts to pass tool grants beyond what the manifest authorizes.	Orchestrator resolves tool grants from the manifest at each invocation. Cannot grant tools not listed in the manifest. MCP server independently verifies the grant.
Prompt injection via manifest swap	Attacker replaces a prompt_ref with a reference to a malicious prompt outside the prompt farm.	Prompt farm is the only authorized source for prompt resolution. External references are rejected.
Tool farm cross-contamination	An agent uses the tool registry to discover and invoke a tool not in its manifest.	Tool registry provides discovery only. Invoking a tool not in the manifest fails at the orchestrator layer.
Prompt / tool store conflation	An agent’s system prompt is stored adjacent to the tool registry.	Prompt farm and tool registry are physically separated stores with separate access controls.
Unauthorized model substitution	An agent’s model_id is changed silently.	model_id is pinned in the manifest. Changes require a manifest update with full change advisory process.
Session bleedthrough via shared manifest state	Runtime state from one user session contaminates the manifest-resolved context for another session.	Capability manifest is read-only at runtime and contains no session state.
HITL bypass	A workflow is modified to route around a HITL gate defined in the manifest.	hitl_required is a manifest-level constraint enforced by the orchestrator. Bypassing requires a manifest change with change advisory authorization.
Orchestrator authority abuse	A compromised or manipulated orchestrator halts, reassigns, or overrides agents beyond legitimate need, disrupting or hijacking the workflow.	The orchestrator's own authority_scope[] is enumerated in its manifest, not implicit in code. Actions outside that scope fail at the same enforcement layer applied to worker agents. Override actions above a frequency threshold require HITL approval via escalation_target.

Hardening the Orchestrator

Everything in this paper up to this point governs what the orchestrator does to other agents. It says nothing about what governs the orchestrator itself.

In practice, orchestration logic gets treated as trusted infrastructure, sitting outside the governance layer it’s supposed to enforce. Nobody assumes the supervisor needs its own supervision.

That assumption doesn’t hold. Give an orchestrator unlimited, ungoverned authority to halt, restart, reassign, or override agent outputs, and it becomes a higher-value target than any single agent it supervises. Compromise it, and the blast radius isn’t one misbehaving agent. It’s the supervisor reassigning work, halting agents that were doing their job fine, and overriding outputs across the whole workflow.

None of this calls for a new architectural component, because the orchestrator’s already there. What it needs is a manifest entry of its own, built on the same schema and enforced through the same path as every agent it supervises. That means an explicit supervises[] list instead of implicit system-wide reach. An enumerated authority_scope[] instead of unlimited authority. And an escalation_target, so unresolved conflicts land on an actual person instead of looping back through another retry.

The orchestrator’s own actions (halts, restarts, reassignments, overrides) get logged through the same immutable audit pipeline as everything else in the system. And hitl_required gates override_output once it crosses a deployment-defined frequency threshold.

Least-Privilege Process Execution

Runtime permissions: The orchestrator process runs with the minimum system permissions its function actually requires.
Secrets access: The orchestrator touches the secrets vault only to retrieve credentials for MCP server authentication. Nothing else.
Network segmentation: Network access is restricted to the manifest store, prompt farm, tool registry, MCP servers listed in the manifest, the HITL interface, and the audit log pipeline. That’s the full list.

Manifest Integrity Protection

Hash verification: Happens at every manifest resolution, not just startup. A mismatch halts the invocation and fires a critical alert.
Write audit: Every write to the manifest store is logged with actor identity, timestamp, and both the previous and new values.
Read audit: Reads are logged too, tied to the workflow correlation ID.

Orchestrator Code Governance

Version control: All orchestrator code, routing logic, and manifest resolution logic lives in version control with mandatory peer review.
Change advisory gate: Changes to routing logic, manifest enforcement behavior, or HITL gate logic go through a full change advisory gate with security review.
Immutable deployment artifacts: Deployments use immutable container images with digest-pinned dependencies.

Change Type	Change Advisory Required?	Regressions Test Required?	ATO Impact?	Audit Log Entry?
Add a new agent role	Yes	Yes, new agent behavioral baseline	Yes, system boundary update	Yes
Add a tool to allowed_tools[]	Yes	Yes, test new tool invocation paths	Yes, data flow update	Yes
Remove a tool from allowed_tools[]	Yes	Yes, verify graceful degradation	Possibly	Yes
Update a prompt version (minor)	Peer review minimum	Yes, behavioral regression	No	Yes
Update a prompt version (major)	Full change advisory	Yes, full behavioral baseline	Possibly	Yes
Upgrade a model version	Full change advisory	Yes, full behavioral baseline	Possibly	Yes
Change hitl_required condition	Full change advisory + security officer	Yes	Yes	Yes
Change data_classification	Full change advisory + security officer	Yes	Yes, controls review	Yes
Update output_schema_ref	Yes	Yes, consumer agents must be retested	Possibly	Yes
Change explainability_level	Yes	Yes, UX and output validation	Possibly	Yes
Change orchestrator routing logic	Full change advisory	Yes, end-to-end workflow	Yes	Yes

NIST 800-53 Control Mapping

AC-2 (Account Management): Agent roles defined in the manifest are the AI equivalent of system accounts.
AC-3 (Access Enforcement): Tool grants are enforced by the orchestrator at runtime from the manifest. That’s AC-3.
AC-6 (Least Privilege): allowed_tools[] scoped to the minimum required tools is a direct implementation of AC-6.
AU-2 / AU-3 / AU-12 (Audit): The end-to-end audit trail covers manifest reads, prompt resolution, tool invocations, output validation, explainability capture, and HITL decisions. That coverage addresses all three controls.
AU-9 (Protection of Audit Information): Immutable, append-only audit logs shipped to a SIEM pipeline cover AU-9.
CA-9 (Internal System Connections): Documented inter-agent data flows with typed schemas and validation at each boundary address CA-9.
CM-3 / CM-6 (Configuration Management): Manifest versioning, change advisory gates, and model version pinning cover CM-3 and CM-6.
CM-14 (Signed Components): Manifest hash verification and immutable deployment artifacts satisfy CM-14.
SA-10 (Developer Configuration Management): Treating prompts as code in version control with peer review is what SA-10 is looking for.
SI-10 (Information Input Validation): Output schema validation at every inter-agent boundary satisfies SI-10.
SI-17 (Fail-Safe Procedures): Schema validation failures escalating to HITL is the graceful degradation behavior SI-17 requires.
PM-14 (Testing, Training, and Monitoring): HITL gate enforcement and behavioral monitoring satisfy PM-14.

Additional federal authorities:

OMB M-16-21: Orchestrator and manifest code developed under federal contracts must be inventoried and assessed for open source release obligation. Government data rights must be preserved.
NIST AI RMF GV-1.2 / MS-2.6: explainability_level manifest field and end-user explainability interface requirements address the explainability and interpretability trustworthy AI characteristic.

Recommendations

The Orchestrator Capability Manifest is not an optional enhancement to a multi-agent AI architecture. It’s a prerequisite for deploying one in a regulated or security-sensitive environment. Without it, tool access, prompt governance, model pinning, explainability, and HITL enforcement are all implicit, undocumented, and unauditable. With it, each of those dimensions becomes a policy artifact that can be reviewed, changed under governance, and defended in an authorization process.

Define the manifest before writing agent code. That includes explainability_level for every role, based on who actually consumes that agent’s output.
Keep the prompt farm and tool registry in physically separate stores with independent access controls. This isn’t optional.
Treat every manifest field as a security control, not a config value. That includes explainability_level. Changes need peer review and change advisory.
Verify the manifest hash at every invocation. Startup-only verification doesn’t protect against runtime tampering.
Log at the manifest level. Audit entries need to capture manifest version, prompt version, tool grants, and explanation data for every invocation.
Build the end-user explainability interface before production deployment, not after, for any agent operating at rationale-summary or full-chain level.
For federally contracted work, assess M-16-21 obligations before the contract period ends, not after.
Give the orchestrator its own manifest entry: supervises[], authority_scope[], escalation_target. Stop treating supervisory authority as infrastructure that just sits there, implicit and unexamined. The component holding the most authority in the system should be the one under the tightest governance, not the one that gets a pass because it’s assumed to be trustwort

References

Meinert, I. (2026). Series article 7: Model Context Protocol (MCP) servers in enterprise AI architecture. Aptive Resources.

Meinert, I. (2026). Series article 6: Multi-model and multi-agent AI workflows: Architecture, risk and DevSecOps controls. Aptive Resources.

Meinert, I. (2026). Series article 5: The orchestrator capability manifest. Aptive Resources.

Meinert, I. (2026). Series article 4: Multi-model and multi-agent AI systems: Infrastructure implementation guide. Aptive Resources.

Meinert, I. (2026). Series article 3: Organizational AI governance: Frameworks, artifacts and implementation guidance. Aptive Resources.

Meinert, I. (2026). Series article 1: NIST AI RMF 1.0 alignment analysis: Three-state coverage assessment and gap remediation roadmap. Aptive Resources.

Joint Task Force. (2020). Security and privacy controls for information systems and organizations (NIST SP 800-53, Rev. 5). National Institute of Standards and Technology. https://doi.org/10.6028/NIST.SP.800-53r5

Tabassi, E. (2023). Artificial intelligence risk management framework (AI RMF 1.0) (NIST AI 100-1). National Institute of Standards and Technology. https://doi.org/10.6028/NIST.AI.100-1

Rose, S., Borchert, O., Mitchell, S., & Connelly, S. (2020). Zero trust architecture (NIST SP 800-207). National Institute of Standards and Technology. https://doi.org/10.6028/NIST.SP.800-207

Office of Management and Budget. (2025, April 3). M-25-21: Accelerating federal use of AI through innovation, governance, and public trust. https://www.whitehouse.gov/wp-content/uploads/2025/04/M-25-21.pdf

Office of Management and Budget. (2025, April 3). M-25-22: Driving efficient acquisition of artificial intelligence in government. https://www.whitehouse.gov/wp-content/uploads/2025/04/M-25-22.pdf

Office of Management and Budget. (2016, August 8). M-16-21: Federal source code policy. https://obamawhitehouse.archives.gov/sites/default/files/omb/memoranda/2016/m_16_21.pdf

OWASP Foundation. (2024). OWASP top 10 for large language model applications, Version 2025. https://owasp.org/www-project-top-10-for-large-language-model-applications/

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