shell
Enable an agent to recognise a physical shell, assess its ability to enclose or protect, and determine whether it may be handled, opened, repaired, removed or reused.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex + Grok
Purpose and description
Enable an agent to recognise a physical shell, assess its ability to enclose or protect, and determine whether it may be handled, opened, repaired, removed or reused.
A rigid, typically thin-walled outer covering of a biological organism, munition, or engineered vessel that encloses and mechanically protects an interior volume.
It can be Inspect and map the shell wall, apertures, seams and suspected breaches.; Measure wall thickness and enclosure geometry using a method appropriate to its material and host relationship.; Support, grip or move the shell at locations justified by its condition and attachment.; Access the interior through an existing opening or documented separation interface when permitted.; Clean, stabilise or repair the wall after checking material compatibility and effects on any host or contents.; Assess a detached shell for refitting, reuse or retirement against its required boundary function..
Distinguishing features
Identify an outer surface and an inward-facing surface that bound or formerly bounded an interior; a solid lump without this relationship does not qualify under the proposed scope.
Establish that the item is the enclosing wall or covering, rather than the entire enclosed organism, device or container assembly.
Determine whether the covering has a distinct wall structure rather than being only a deposited coating or surface finish.
Check whether an apparently empty shell is detached or abandoned, rather than assuming that it was designed to function independently.
Record whether the boundary is continuous, deliberately open or composed of joined parts; complete closure is not required by this provisional interpretation.
Scope
+ The shell wall, its inner and outer surfaces, and the space it bounds
+ Openings, seams, rims and interfaces through which the shell connects to a host or contents
+ Wall material, thickness, curvature and local reinforcement
+ Cracks, perforations, deformation and other changes affecting enclosure or protection
+ Whether the shell is integral to a living host, attached to an assembly or detached
- The physiology and welfare of a whole organism bearing a shell
- The identity and operation of equipment enclosed by a shell
- The composition and behaviour of contained substances
- Coatings and surface treatments considered as independent things
- Ammunition assemblies called shells, beyond their enclosing component
- Command interpreters and other software meanings of shell
Characteristics
- Shell origin
- biological; manufactured; other evidenced origin; unknown Origin changes how growth, attachment, damage and permissible intervention must be interpreted.
- Host relationship
- integral to identified host; attached to identified assembly; detached from known host; host unknown A detached shell and an integral covering can require very different handling decisions.
- Wall thickness distribution
- mm at identified locations, with measurement method and uncertainty Local thinning and thickness variation affect where inspection and support are needed.
- Wall construction
- observed material or materials; layer arrangement; reinforcement; unknown Wall construction constrains suitable inspection, cleaning, joining and repair methods.
- Enclosure geometry
- overall dimensions in mm; aperture dimensions in mm; cavity volume in cm³ where measurable Geometry determines fit, access, support and potential reuse.
- Boundary continuity
- continuous; intentionally open; unintentionally breached; uncertain An intended opening must be distinguished from damage before protection can be assessed.
- Wall defect condition
- mapped cracks, chips, perforations, delamination, erosion or deformation, with extent and inspection date Defect location and extent help determine whether handling or continued use could worsen failure.
- Occupancy relationship
- identified contents or occupant; confirmed empty; inaccessible; unknown Opening, cleaning or disposal depends on what the shell currently encloses.
- Required boundary function
- recorded requirements for mechanical protection, containment, separation, support or another evidenced function Condition is meaningful only against the function this particular shell must perform.
Also called
+10
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.shell-substance
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 9 findings · 24 questions.
Shell identity and host Establish what physical boundary is being modelled and what it belongs to.
The word shell can identify a covering, a detached remnant or an entire named object; agents must establish the intended referent before acting.
Covering boundary
Identify the wall and distinguish it from neighbouring parts.
Identified shell wall
Record the observed surfaces and edges that delimit the shell itself.
- Which physical wall is called the shell, and what evidence identifies its inward-facing and outward-facing surfaces? definition
- Are liners, coatings, hinges, lids or fasteners part of this shell or separately modelled components? boundary
Origin and attachment
Establish how the shell formed and whether it remains part of a host.
Host and origin evidence
Record supported origin and attachment claims without inferring abandonment from appearance.
- What observation or record establishes whether this shell was biologically formed or manufactured? provenance
- Is the shell integral to a living host, attached to an assembly or detached, and how was that relationship established? boundary
- If detached, is its original host or assembly known? provenance
Wall and enclosure Describe the material wall and the interior boundary it creates.
A shell's usefulness depends on wall construction and enclosure geometry, which cannot be recovered from its outer dimensions alone.
Wall construction
Capture thickness, material layers and local structural features.
Wall profile
Record measured or evidenced wall properties at identifiable locations.
- What materials and layers constitute the wall, and which identifications remain uncertain? definition
- How does wall thickness vary around rims, seams, curved regions and reinforcement features? measurement
- Which thickness or material observations are direct measurements, and which come from specifications or inference? provenance
Cavity and apertures
Locate the bounded interior and all routes through its boundary.
Enclosure map
Record cavity shape, openings and joining edges relevant to access and fit.
- What interior space does the shell bound, and what dimensions constrain occupancy or refitting? measurement
- Which apertures, seams and open edges are expected features, and which lack an established explanation? boundary
- Which openings provide access without cutting, breaking or detaching the shell? action
Protection and integrity Assess whether the shell can perform its required boundary functions.
A shell may appear intact yet fail its intended function, while an intentionally open shell may remain fully serviceable.
Boundary requirements
Identify what the shell must resist, retain, separate or support.
Required shell performance
Record the specific protection or enclosure requirements against which condition is judged.
- What must this shell protect, contain, separate or support in its present context? definition
- What evidence establishes acceptable loads, exposure conditions or leakage for this particular shell? provenance
- What inspection or measurement can establish whether those requirements are currently met? measurement
Wall discontinuities
Locate damage and distinguish it from normal construction or growth features.
Defect map and consequence
Record defects, their observed extent and their implications for the shell's required function.
- Where are cracks, chips, thinning, perforations, separated layers or deformed regions, and how extensive are they? measurement
- What evidence distinguishes each suspected defect from an intended seam, aperture or natural formation feature? boundary
- Which observed defects require restricted handling, further inspection or removal from the current use? action
Access and intervention Determine how the shell can be handled or changed in relation to its host and interior.
Actions on an outer wall can affect hidden contents or an attached host, and opening can irreversibly change the shell's function.
Occupancy and separation
Establish what lies inside and how the shell can be opened or detached.
Interior access decision
Record the evidence and constraints needed to choose an access or separation method.
- What evidence establishes current occupancy, contents or emptiness, including inaccessible regions? provenance
- Which attachment points or joining surfaces must be released to open or detach the shell? boundary
- Can the proposed access preserve the shell and avoid unacceptable effects on its host or contents? action
Handling, repair and reuse
Choose interventions consistent with wall condition and required future function.
Shell intervention plan
Record justified support, treatment and acceptance conditions for a proposed intervention.
- Where can the shell be supported or gripped without concentrating force on damaged wall regions or vulnerable rims? action
- Which cleaning or repair method is supported for the identified wall materials and current host relationship? action
- What inspection or functional check must pass before the shell is refitted or reused? measurement
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- mollusc shell
- eggshell
- turtle/carapace shell
- artillery shell
- pressure-vessel/tank shell
- architectural/building shell
- thin-shell structure
- seed/nut shell
- Which of these kinds and varieties hold for the sense of shell this model covers, and on what evidence? provenance
Sources
What the second pass must settle
- Does vr.tr.shell denote biological shells, manufactured enclosing walls, structural shells or another physical sense, and is the proposed shared scope justified?
- Does an existing Vercy world model already own this concept or one of its intended meanings?
- Where should the registry draw boundaries between shell, housing, casing, exoskeleton, husk and container?
- Should flexible coverings and shell fragments qualify, and what minimum evidence of an enclosing wall is required?
- Which authoritative sources establish subtype-specific inspection methods, failure criteria and intervention limits?