Anthropic's changelog says subagent forking is on by default and that a fork inherits the full conversation and prompt cache. The subagent documentation says a fork sees the same system prompt, tools, model and message history, and that a subagent inherits the main conversation's permission mode when its own is unset. Moona Intelligence reads this as a distinct governance question we call Authority Inheritance: when one agent creates another, which parts of the first agent's authority should automatically survive that handoff? Updated 23 August 2026 with newly surfaced evidence about Grantex, a specification frozen in February 2026 and a related Internet Draft submitted to the IETF in March 2026, which answers the same question with an opposite default: bounded, attenuating delegation rather than full inheritance. Updated again 27 August 2026 with a second individual Internet-Draft, draft-asor-wimse-agent-delegation-chain-00, targeting the WIMSE working group and authored by Rafael Asor of Attenu, whose contribution is narrower and different from Grantex's: an offline, enforcement-point-verifiable way for the resource receiving a delegated agent's final action to cryptographically confirm that authority narrowed at every hop of the chain, without proving who was entitled to grant the root authority in the first place. Updated again 31 August 2026 after attenu-guard shipped an opt-in execution-binding feature that records the observed outcome of a guarded call against the decision that authorized it, narrowing but not closing the gap this record has already named between a chain verifying correctly and an action completing as intended, with the Internet-Draft itself still unrevised and still not adopted by any working group. Updated again 4 September 2026 after the draft's author posted revision 01, which trades a generic actions and locations authority model for a dedicated scope grammar and adds a minimum bound constraint that narrows upward, the mirror of every ceiling already in the vocabulary, still with no working group adoption and, this record now finds directly, a reference implementation whose shipped wire format already matches the new scope model while its interop vectors do not yet cover the new minimum bound. A same day pass adds a fourth, generally available architecture answering this record's own question with a kind of limit neither Grantex nor the WIMSE draft specifies: HashiCorp Vault Enterprise 2.1, generally available 1 September 2026, which narrows a delegated agent's effective authority to the intersection of the represented human's own policy, a separately configured agent ceiling and a per request authorization detail an external authorization server issues under RFC 9396, checked again on every request rather than once at the moment authority was first delegated. Updated again 5 September 2026 after a late-discovered research paper, VERA, arXiv:2608.30091, was read in full: it asks this record's own question in reverse, proving that under disjunctive authority a withdrawn delegation edge should invalidate exactly the agents whose every authorizing path used it, no more and no less, and measuring that a tree cascade over-revokes shared agents with an alternate path while a deployer-scoped cascade under-revokes a descendant whose only authority crossed into another deployer's domain, with the paper's own named artifact unresolvable to any repository this session could locate. Updated again 6 September 2026 after nono's Tool Sandbox was read directly from its own source: a controlled command runs in a fresh, minimal sandbox built solely from that command's own selected policy edge, with filesystem, network and credential grants that do not carry over from the invoking session or the invoking command by default, a caller specific from.<caller> edge required before one mediated command may invoke another, and a documented per invocation override that can widen a specific command's sandbox rather than only narrow it. Updated again 8 September 2026 with a seventh architecture, and the first surfaced through the delegated actor's own first-party bug report: Adept issue 334, filed by the project's own maintainer, documents a reviewer worker whose skill contract calls it read-only against the target and git state while never specifying which subagent type carries out that review, so a fork, which inherits the parent session's full conversation by design, ran as the implementer instead, committing, pushing and opening a pull request the issue's own account, not this record's independent host-level observation, attributes to the reviewer's forked context. This record independently confirms the named pull request, randomparity/kdive#2308, exists and merged the same day; it does not independently confirm which acting process authored it beyond the issue's own telling. The issue's own diagnosis matches this record's argument exactly, and is quoted directly below: a prompt-level instruction to stay read-only is not an enforcement mechanism, dispatching a fresh, non-forking worker instead of a fork is, and the issue reports that mechanism as still unspecified in the calling skill's own current text. Updated again 13 September 2026 after an eighth architecture reached this record through a single compact upstream evidence bundle rather than a direct fetch: Improbable's Bolter, launched 10 September 2026, whose own post states a per agent computer, browser and memory, agents that plan, debate and hand work to each other, a per run receipt of what ran, changed and awaits sign off, and an approval gate on anything leaving the workspace. This record reads those four captured claims for what they do not establish: how a delegation envelope binds across a hand off, whether a further hop can widen scope, whether the approval gate binds to a specific artifact or state, and whether a later workspace mutation invalidates an already issued receipt.